STScI Scientist Julien H Girard

All Stories

1. 
   The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VI. Evidence for Radially Evolving Icy Grains in the HD 141569A Disk via NIRCam Coronagraphic Imaging

   Article • The Astrophysical Journal, November 2025, American Astronomical Society

   STScI Scientist Julien H Girard

2. 
   Direct Measurement of Extinction in a Planet-hosting Gap

   Article • The Astronomical Journal, November 2025, American Astronomical Society

   STScI Scientist Julien H Girard

3. 
   Constraints on the Orbit of the Young Substellar Companion GQ Lup B from High-resolution Spectroscopy and VLTI/GRAVITY Astrometry *

   Article • The Astrophysical Journal, October 2025, American Astronomical Society

   STScI Scientist Julien H Girard

4. 
   Probing the Outskirts of M Dwarf Planetary Systems with a Cycle 1 JWST NIRCam Coronagraphy Survey

   Article • The Astronomical Journal, September 2025, American Astronomical Society

   STScI Scientist Julien H Girard

5. 
   Direct imaging discovery of a young giant planet orbiting on Solar System scales

   Article • Astronomy and Astrophysics, July 2025, EDP Sciences

   STScI Scientist Julien H Girard

6. 
   Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY

   Article • Astronomy and Astrophysics, July 2025, EDP Sciences

   STScI Scientist Julien H Girard

7. 
   JWST Coronagraphic Images of 14 Her c: A Cold Giant Planet in a Dynamically Hot Multiplanet System

   Article • The Astrophysical Journal Letters, July 2025, American Astronomical Society

   STScI Scientist Julien H Girard

8. 
   Follow-up Exploration of the TWA 7 Planet–Disk System with JWST NIRCam

   Article • The Astrophysical Journal Letters, July 2025, American Astronomical Society

   STScI Scientist Julien H Girard

9. 
   Silicate clouds and a circumplanetary disk in the YSES-1 exoplanet system

   Article • Nature, June 2025, Springer Science + Business Media

   STScI Scientist Julien H Girard

10. 
    The SPHERE infrared survey for exoplanets (SHINE)

    Article • Astronomy and Astrophysics, May 2025, EDP Sciences

    STScI Scientist Julien H Girard

11. 
    The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. III. Aperture Masking Interferometric Observations of the Star HIP 65426 at 3.8 μm

    Article • The Astrophysical Journal Letters, April 2025, American Astronomical Society

    STScI Scientist Julien H Girard

12. 
    JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO2 in the HR 8799 and 51 Eri Exoplanets’ Atmospheres

    Article • The Astronomical Journal, March 2025, American Astronomical Society

    STScI Scientist Julien H Girard

13. 
    Direct imaging and dynamical mass of a benchmark T-type brown dwarf companion to HD 167665

    Article • Astronomy and Astrophysics, November 2024, EDP Sciences

    STScI Scientist Julien H Girard

14. 
    JWST-TST High Contrast: Spectroscopic Characterization of the Benchmark Brown Dwarf HD 19467 B with the NIRSpec Integral Field Spectrograph

    Article • The Astronomical Journal, October 2024, American Astronomical Society

    STScI Scientist Julien H Girard

15. 
    MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision

    Article • The Astrophysical Journal, September 2024, American Astronomical Society

    STScI Scientist Julien H Girard

16. 
    The Nancy Grace Roman Space Telescope coronagraph community participation program

    Article • August 2024, SPIE

    STScI Scientist Julien H Girard

17. 
    The Roman coronagraph community participation program: data reduction pipeline and simulations

    Article • August 2024, SPIE

    STScI Scientist Julien H Girard

18. 
    The Roman coronagraph community participation program: observation planning

    Article • August 2024, SPIE

    STScI Scientist Julien H Girard

19. 
    Combining Gaia and GRAVITY: Characterising five new directly detected substellar companions

    Article • Astronomy and Astrophysics, August 2024, EDP Sciences

    STScI Scientist Julien H Girard

20. 
    JWST-TST High Contrast: Achieving Direct Spectroscopy of Faint Substellar Companions Next to Bright Stars with the NIRSpec Integral Field Unit

    Article • The Astronomical Journal, July 2024, American Astronomical Society

    STScI Scientist Julien H Girard

21. 
    JWST-TST High Contrast: JWST/NIRCam Observations of the Young Giant Planet β Pic b

    Article • The Astronomical Journal, July 2024, American Astronomical Society

    STScI Scientist Julien H Girard

22. 
    Catalogue of dual-field interferometric binary calibrators

    Article • Astronomy and Astrophysics, July 2024, EDP Sciences

    STScI Scientist Julien H Girard

23. 
    Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY

    Article • Astronomy and Astrophysics, July 2024, EDP Sciences

    STScI Scientist Julien H Girard

24. 
    SPHERE RefPlanets: Search for ε Eridani b and warm dust

    Article • Astronomy and Astrophysics, July 2024, EDP Sciences

    STScI Scientist Julien H Girard

25. 
    High contrast at short separation with VLTI/GRAVITY: Bringing Gaia companions to light

    Article • Astronomy and Astrophysics, June 2024, EDP Sciences

    STScI Scientist Julien H Girard

26. 
    JWST/NIRCam Detection of the Fomalhaut C Debris Disk in Scattered Light

    Article • The Astrophysical Journal Letters, May 2024, American Astronomical Society

    STScI Scientist Julien H Girard

27. 
    The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256–1257 b

    Article • The Astrophysical Journal Letters, April 2024, American Astronomical Society

    STScI Scientist Julien H Girard

28. 
    MIRI MRS Observations of β Pictoris. I. The Inner Dust, the Planet, and the Gas

    Article • The Astrophysical Journal, March 2024, American Astronomical Society

    STScI Scientist Julien H Girard

29. 
    The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned

    Article • The Astrophysical Journal Letters, February 2024, American Astronomical Society

    STScI Scientist Julien H Girard

30. 
    JWST-TST High Contrast: Asymmetries, Dust Populations, and Hints of a Collision in the β Pictoris Disk with NIRCam and MIRI

    Article • The Astronomical Journal, January 2024, American Astronomical Society

    STScI Scientist Julien H Girard

31. 
    VLTI/GRAVITY Provides Evidence the Young, Substellar Companion HD 136164 Ab Formed Like a “Failed Star”

    Article • The Astronomical Journal, January 2024, American Astronomical Society

    STScI Scientist Julien H Girard

32. 
    First VLTI/GRAVITY Observations of HIP 65426 b: Evidence for a Low or Moderate Orbital Eccentricity

    Article • The Astronomical Journal, November 2023, American Astronomical Society

    STScI Scientist Julien H Girard

33. 
    Large Interferometer For Exoplanets (LIFE)

    Article • Astronomy and Astrophysics, October 2023, EDP Sciences

    STScI Scientist Julien H Girard

34. 
    VLTI/GRAVITY Observations and Characterization of the Brown Dwarf Companion HD 72946 B

    Article • The Astrophysical Journal, October 2023, American Astronomical Society

    STScI Scientist Julien H Girard

35. 
    TOI-179: A young system with a transiting compact Neptune-mass planet and a low-mass companion in outer orbit

    Article • Astronomy and Astrophysics, July 2023, EDP Sciences

    STScI Scientist Julien H Girard

36. 
    The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-contrast Imaging of the Exoplanet HIP 65426 b from 2 to 16 μm

    Article • The Astrophysical Journal Letters, July 2023, American Astronomical Society

    STScI Scientist Julien H Girard

37. 
    The James Webb Space Telescope Mission

    Article • Publications of the Astronomical Society of the Pacific, June 2023, Institute of Physics Publishing

    STScI Scientist Julien H Girard

38. 
    The Science Performance of JWST as Characterized in Commissioning

    Article • Publications of the Astronomical Society of the Pacific, April 2023, Institute of Physics Publishing

    STScI Scientist Julien H Girard

39. 
    Time-resolved Optical Polarization Monitoring of the Most Variable Brown Dwarf

    Article • The Astronomical Journal, March 2023, American Astronomical Society

    STScI Scientist Julien H Girard

40. 
    The high-albedo, low polarization disk around HD 114082 that harbors a Jupiter-sized transiting planet

    Article • Astronomy and Astrophysics, March 2023, EDP Sciences

    STScI Scientist Julien H Girard

41. 
    Direct discovery of the inner exoplanet in the HD 206893 system

    Article • Astronomy and Astrophysics, March 2023, EDP Sciences

    STScI Scientist Julien H Girard

42. 
    The JWST Early-release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 μm Spectrum of the Planetary-mass Companion VHS 1256–1257 b

    Article • The Astrophysical Journal Letters, March 2023, American Astronomical Society

    STScI Scientist Julien H Girard

43. 
    Performance of NIRCam on JWST in Flight

    Article • Publications of the Astronomical Society of the Pacific, February 2023, Institute of Physics Publishing

    STScI Scientist Julien H Girard

44. 
    The SPHERE view of three interacting twin disc systems in polarized light

    Article • Monthly Notices of the Royal Astronomical Society, November 2022, Oxford University Press (OUP)

    STScI Scientist Julien H Girard

45. 
    JWST/MIRI coronagraphic performances as measured on-sky

    Article • Astronomy and Astrophysics, November 2022, EDP Sciences

    STScI Scientist Julien H Girard

46. 
    Orbital and dynamical analysis of the system around HR 8799

    Article • Astronomy and Astrophysics, October 2022, EDP Sciences

    STScI Scientist Julien H Girard

47. 
    Reference-star differential imaging on SPHERE/IRDIS

    Article • Astronomy and Astrophysics, October 2022, EDP Sciences

    STScI Scientist Julien H Girard

48. 
    Constraining masses and separations of unseen companions to five accelerating nearby stars

    Article • Astronomy and Astrophysics, September 2022, EDP Sciences

    STScI Scientist Julien H Girard

49. 
    Probing the innermost region of the AU Microscopii debris disc

    Article • Astronomy and Astrophysics, September 2022, EDP Sciences

    STScI Scientist Julien H Girard

50. 
    The JWST Early Release Science Program for the Direct Imaging and Spectroscopy of Exoplanetary Systems

    Article • Publications of the Astronomical Society of the Pacific, September 2022, Institute of Physics Publishing

    STScI Scientist Julien H Girard

51. 
    First Peek with JWST/NIRCam Wide-field Slitless Spectroscopy: Serendipitous Discovery of a Strong [O iii]/Hα Emitter at z = 6.11

    Article • The Astrophysical Journal Letters, August 2022, American Astronomical Society

    STScI Scientist Julien H Girard

52. 
    Direct imaging and spectroscopy of exoplanetary systems with the JWST early release science program

    Article • August 2022, SPIE

    STScI Scientist Julien H Girard

53. 
    JWST/NIRCam coronagraphy: commissioning and first on-sky results

    Article • August 2022, SPIE

    STScI Scientist Julien H Girard

54. 
    Nancy Grace Roman Space Telescope coronagraph instrument observation calibration plan

    Article • August 2022, SPIE

    STScI Scientist Julien H Girard

55. 
    Performance of near-infrared high-contrast imaging methods with JWST from commissioning

    Article • August 2022, SPIE

    STScI Scientist Julien H Girard

56. 
    Large Interferometer For Exoplanets (LIFE)

    Article • Astronomy and Astrophysics, August 2022, EDP Sciences

    STScI Scientist Julien H Girard, Tim Lichtenberg

57. 
    ISPY – NaCo Imaging Survey for Planets around Young stars

    Article • Astronomy and Astrophysics, July 2022, EDP Sciences

    STScI Scientist Julien H Girard

58. 
    New binaries from the SHINE survey

    Article • Astronomy and Astrophysics, July 2022, EDP Sciences

    STScI Scientist Julien H Girard

59. 
    Trends in Silicates in the β Pictoris Disk

    Article • The Astrophysical Journal, July 2022, American Astronomical Society

    STScI Scientist Julien H Girard

60. 
    Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor

    Article • Astronomy and Astrophysics, April 2022, EDP Sciences

    STScI Scientist Julien H Girard

61. 
    Characterizing the Protolunar Disk of the Accreting Companion GQ Lupi B*

    Article • The Astronomical Journal, December 2021, American Astronomical Society

    STScI Scientist Julien H Girard

62. 
    The mass ofβPictoris c fromβPictoris b orbital motion

    Article • Astronomy and Astrophysics, October 2021, EDP Sciences

    STScI Scientist Julien H Girard

63. 
    Simulating JWST high contrast observations with PanCAKE

    Article • September 2021, SPIE

    STScI Scientist Julien H Girard

64. 
    Lessons learned from SPHERE for the astrometric strategy of the next generation of exoplanet imaging instruments

    Article • Journal of Astronomical Telescopes Instruments and Systems, August 2021, SPIE

    STScI Scientist Julien H Girard

65. 
    GRAVITY K-band spectroscopy of HD 206893 B

    Article • Astronomy and Astrophysics, August 2021, EDP Sciences

    STScI Scientist Julien H Girard

66. 
    Constraints on the nearby exoplanet ϵ Indi Ab from deep near- and mid-infrared imaging limits

    Article • Astronomy and Astrophysics, July 2021, EDP Sciences

    STScI Scientist Julien H Girard

67. 
    The SPHERE infrared survey for exoplanets (SHINE)

    Article • Astronomy and Astrophysics, July 2021, EDP Sciences

    STScI Scientist Julien H Girard

68. 
    The SPHERE infrared survey for exoplanets (SHINE)

    Article • Astronomy and Astrophysics, July 2021, EDP Sciences

    STScI Scientist Julien H Girard

69. 
    Direct Imaging of Exoplanets beyond the Radial Velocity Limit: Application to the HD 134987 System

    Article • The Astronomical Journal, June 2021, American Astronomical Society

    STScI Scientist Julien H Girard

70. 
    A MUSE view of the asymmetric jet from HD 163296

    Article • Astronomy and Astrophysics, June 2021, EDP Sciences

    STScI Scientist Julien H Girard

71. 
    Community exoplanet imaging data challenge for Roman CGI and starshade rendezvous

    Article • Journal of Astronomical Telescopes Instruments and Systems, May 2021, SPIE

    STScI Scientist Julien H Girard

72. 
    Possible single-armed spiral in the protoplanetary disk around HD 34282

    Article • Astronomy and Astrophysics, May 2021, EDP Sciences

    STScI Scientist Julien H Girard

73. 
    A search for a fifth planet around HR 8799 using the star-hopping RDI technique at VLT/SPHERE

    Article • Astronomy and Astrophysics, April 2021, EDP Sciences

    STScI Scientist Julien H Girard

74. 
    A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS

    Article • Astronomy and Astrophysics, March 2021, EDP Sciences

    STScI Scientist Julien H Girard

75. 
    Constraining the Nature of the PDS 70 Protoplanets with VLTI/GRAVITY ∗

    Article • The Astronomical Journal, February 2021, American Astronomical Society

    STScI Scientist Julien H Girard

76. 
    A faint companion around CrA-9: protoplanet or obscured binary?

    Article • Monthly Notices of the Royal Astronomical Society, February 2021, Oxford University Press (OUP)

    STScI Scientist Julien H Girard

77. 
    Investigating three Sirius-like systems with SPHERE

    Article • Astronomy and Astrophysics, February 2021, EDP Sciences

    STScI Scientist Julien H Girard

78. 
    Data processing for high-contrast imaging with the James Webb Space Telescope

    Article • December 2020, SPIE

    STScI Scientist Julien H Girard

79. 
    Planet formation with all flavors of adaptive optics: VLT/MUSE’s laser tomography adaptive optics to directly image young accreting exoplanets

    Article • December 2020, SPIE

    STScI Scientist Julien H Girard

80. 
    The ExoGRAVITY project: using single mode interferometry to characterize exoplanets

    Article • December 2020, SPIE

    STScI Scientist Julien H Girard

81. 
    The Roman exoplanet Imaging data challenge: a major community engagement effort

    Article • December 2020, SPIE

    STScI Scientist Julien H Girard

82. 
    Searching for proto-planets with MUSE

    Article • Astronomy and Astrophysics, December 2020, EDP Sciences

    STScI Scientist Julien H Girard

83. 
    A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars

    Article • The Astronomical Journal, November 2020, American Astronomical Society

    STScI Scientist Julien H Girard

84. 
    Direct imaging of sub-Jupiter mass exoplanets with James Webb Space Telescope coronagraphy

    Article • Monthly Notices of the Royal Astronomical Society, November 2020, Oxford University Press (OUP)

    STScI Scientist Julien H Girard

85. 
    Direct confirmation of the radial-velocity planet β Pictoris c

    Article • Astronomy and Astrophysics, October 2020, EDP Sciences

    STScI Scientist Julien H Girard

86. 
    Unveiling the β Pictoris system, coupling high contrast imaging, interferometric, and radial velocity data

    Article • Astronomy and Astrophysics, October 2020, EDP Sciences

    STScI Scientist Julien H Girard

87. 
    CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion

    Article • Astronomy and Astrophysics, August 2020, EDP Sciences

    STScI Scientist Julien H Girard

88. 
    Retrieving scattering clouds and disequilibrium chemistry in the atmosphere of HR 8799e

    Article • Astronomy and Astrophysics, August 2020, EDP Sciences

    STScI Scientist Julien H Girard

89. 
    Dynamical Evidence of a Spiral Arm–driving Planet in the MWC 758 Protoplanetary Disk

    Article • The Astrophysical Journal Letters, July 2020, American Astronomical Society

    STScI Scientist Julien H Girard

90. 
    VLT/SPHERE survey for exoplanets around young early-type stars, including systems with multi-belt architectures

    Article • Astronomy and Astrophysics, July 2020, EDP Sciences

    STScI Scientist Julien H Girard

91. 
    Detection of Polarization due to Cloud Bands in the Nearby Luhman 16 Brown Dwarf Binary

    Article • The Astrophysical Journal, May 2020, American Astronomical Society

    STScI Scientist Julien H Girard

92. 
    ISPY-NACO Imaging Survey for Planets around Young stars

    Article • Astronomy and Astrophysics, March 2020, EDP Sciences

    STScI Scientist Julien H Girard

93. 
    RefPlanets: Search for reflected light from extrasolar planets with SPHERE/ZIMPOL

    Article • Astronomy and Astrophysics, February 2020, EDP Sciences

    STScI Scientist Julien H Girard

94. 
    Polarimetric imaging mode of VLT/SPHERE/IRDIS

    Article • Astronomy and Astrophysics, January 2020, EDP Sciences

    STScI Scientist Julien H Girard

95. 
    Polarimetric imaging mode of VLT/SPHERE/IRDIS

    Article • Astronomy and Astrophysics, January 2020, EDP Sciences

    STScI Scientist Julien H Girard

96. 
    Early formation and recent starburst activity in the nuclear disk of the Milky Way

    Article • Nature Astronomy, December 2019, Springer Science + Business Media

    STScI Scientist Julien H Girard

97. 
    NaCo polarimetric observations of Sz 91 transitional disc: a remarkable case of dust filtering

    Article • Monthly Notices of the Royal Astronomical Society, December 2019, Oxford University Press (OUP)

    STScI Scientist Julien H Girard

98. 
    SPHERE: the exoplanet imager for the Very Large Telescope

    Article • Astronomy and Astrophysics, November 2019, EDP Sciences

    STScI Scientist Julien H Girard

99. 
    GALACTICNUCLEUS: A high-angular-resolution JHKs imaging survey of the Galactic centre

    Article • Astronomy and Astrophysics, October 2019, EDP Sciences

    STScI Scientist Julien H Girard

100. 
     Constraining the properties of HD 206893 B

     Article • Astronomy and Astrophysics, August 2019, EDP Sciences

     STScI Scientist Julien H Girard

101. 
     The inner dust shell of Betelgeuse detected by polarimetric aperture-masking interferometry

     Article • Astronomy and Astrophysics, August 2019, EDP Sciences

     STScI Scientist Julien H Girard

102. 
     ISPY – NaCo Imaging Survey for Planets around Young stars

     Article • Astronomy and Astrophysics, July 2019, EDP Sciences

     STScI Scientist Julien H Girard

103. 
     Constraining the properties of HD 206893 B

     Article • Astronomy and Astrophysics, July 2019, EDP Sciences

     STScI Scientist Julien H Girard

104. 
     Two accreting protoplanets around the young star PDS 70

     Article • Nature Astronomy, June 2019, Springer Science + Business Media

     STScI Scientist Julien H Girard

105. 
     Evidence for a Circumplanetary Disk around Protoplanet PDS 70 b

     Article • The Astrophysical Journal Letters, June 2019, American Astronomical Society

     STScI Scientist Julien H Girard

106. 
     Separating extended disc features from the protoplanet in PDS 70 using VLT/SINFONI

     Article • Monthly Notices of the Royal Astronomical Society, May 2019, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

107. 
     Kernel phase imaging with VLT/NACO: high-contrast detection of new candidate low-mass stellar companions at the diffraction limit

     Article • Monthly Notices of the Royal Astronomical Society, March 2019, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

108. 
     SPHERE dynamical and spectroscopic characterization of HD 142527B

     Article • Astronomy and Astrophysics, February 2019, EDP Sciences

     STScI Scientist Julien H Girard

109. 
     A search for accreting young companions embedded in circumstellar disks

     Article • Astronomy and Astrophysics, February 2019, EDP Sciences

     STScI Scientist Julien H Girard

110. 
     Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b

     Article • Astronomy and Astrophysics, January 2019, EDP Sciences

     STScI Scientist Julien H Girard

111. 
     Post-conjunction detection of β Pictoris b with VLT/SPHERE

     Article • Astronomy and Astrophysics, January 2019, EDP Sciences

     STScI Scientist Julien H Girard

112. 
     Star formation history and metallicity in the Galactic inner bulge revealed by the red giant branch bump

     Article • Astronomy and Astrophysics, December 2018, EDP Sciences

     STScI Scientist Julien H Girard

113. 
     Dynamical masses of M-dwarf binaries in young moving groups

     Article • Astronomy and Astrophysics, November 2018, EDP Sciences

     STScI Scientist Julien H Girard

114. 
     Mapping of shadows cast on a protoplanetary disk by a close binary system

     Article • Nature Astronomy, November 2018, Springer Science + Business Media

     STScI Scientist Julien H Girard

115. 
     SPHERE/ZIMPOL high resolution polarimetric imager

     Article • Astronomy and Astrophysics, November 2018, EDP Sciences

     STScI Scientist Julien H Girard

116. 
     Dynamical masses of M-dwarf binaries in young moving groups

     Article • Astronomy and Astrophysics, October 2018, EDP Sciences

     STScI Scientist Julien H Girard

117. 
     Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70

     Article • Astronomy and Astrophysics, September 2018, EDP Sciences

     STScI Scientist Julien H Girard

118. 
     Orbital and atmospheric characterization of the planet within the gap of the PDS 70 transition disk

     Article • Astronomy and Astrophysics, September 2018, EDP Sciences

     STScI Scientist Julien H Girard

119. 
     Characterization of low-mass companion HD 142527 B

     Article • Astronomy and Astrophysics, September 2018, EDP Sciences

     STScI Scientist Julien H Girard

120. 
     Medium-resolution integral-field spectroscopy for high-contrast exoplanet imaging

     Article • Astronomy and Astrophysics, September 2018, EDP Sciences

     STScI Scientist Julien H Girard

121. 
     Making good use of JWST's coronagraphs: tools and strategies from a user's perspective

     Article • August 2018, SPIE

     STScI Scientist Julien H Girard

122. 
     Lessons for WFIRST CGI from ground-based high-contrast systems

     Article • August 2018, SPIE

     STScI Scientist Julien H Girard

123. 
     Updated optical modeling of JWST coronagraph performance contrast, stability, and strategies

     Article • August 2018, SPIE

     STScI Scientist Julien H Girard

124. 
     Low wind effect on VLT/SPHERE: impact, mitigation strategy, and results

     Article • July 2018, SPIE

     STScI Scientist Julien H Girard

125. 
     The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event

     Article • Monthly Notices of the Royal Astronomical Society, July 2018, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

126. 
     Physical, spectral, and dynamical properties of asteroid (107) Camilla and its satellites

     Article • Icarus, July 2018, Elsevier

     STScI Scientist Julien H Girard

127. 
     SAFARI – I. A SPHERE discovery of a super metal-rich M-dwarf companion to the star HD 86006

     Article • Monthly Notices of the Royal Astronomical Society, June 2018, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

128. 
     First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi

     Article • Astronomy and Astrophysics, June 2018, EDP Sciences

     STScI Scientist Julien H Girard

129. 
     Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries

     Article • Astronomy and Astrophysics, June 2018, EDP Sciences

     STScI Scientist Julien H Girard

130. 
     Dynamical models to explain observations with SPHERE in planetary systems with double debris belts

     Article • Astronomy and Astrophysics, March 2018, EDP Sciences

     STScI Scientist Julien H Girard

131. 
     GALACTICNUCLEUS: A high angular resolution JHKs imaging survey of the Galactic centre

     Article • Astronomy and Astrophysics, February 2018, EDP Sciences

     STScI Scientist Julien H Girard

132. 
     In-depth study of moderately young but extremely red, very dusty substellar companion HD 206893B

     Article • Astronomy and Astrophysics, December 2017, EDP Sciences

     STScI Scientist Julien H Girard

133. 
     Investigation of the inner structures around HD 169142 with VLT/SPHERE

     Article • Monthly Notices of the Royal Astronomical Society, November 2017, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

134. 
     The HIP 79977 debris disk in polarized light

     Article • Astronomy and Astrophysics, November 2017, EDP Sciences

     STScI Scientist Julien H Girard

135. 
     Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets

     Article • September 2017, SPIE

     STScI Scientist Julien H Girard

136. 
     Discovery of a warm, dusty giant planet around HIP 65426

     Article • Astronomy and Astrophysics, September 2017, EDP Sciences

     STScI Scientist Julien H Girard

137. 
     Exploring Dust around HD 142527 down to 0.″025 (4 au) Using SPHERE/ZIMPOL

     Article • The Astronomical Journal, June 2017, American Astronomical Society

     STScI Scientist Julien H Girard

138. 
     A Resolved and Asymmetric Ring of PAHs within the Young Circumstellar Disk of IRS 48

     Article • The Astrophysical Journal, June 2017, American Astronomical Society

     STScI Scientist Julien H Girard

139. 
     SPHERE/ZIMPOL observations of the symbiotic system R Aquarii

     Article • Astronomy and Astrophysics, June 2017, EDP Sciences

     STScI Scientist Julien H Girard

140. 
     A search for passive protoplanetary discs in the Taurus–Auriga star-forming region

     Article • Monthly Notices of the Royal Astronomical Society, May 2017, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

141. 
     The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits. IV. Gravitational instability rarely forms wide, giant planets

     Article • Astronomy and Astrophysics, March 2017, EDP Sciences

     STScI Scientist Julien H Girard

142. 
     Three Radial Gaps in the Disk of TW Hydrae Imaged with SPHERE

     Article • The Astrophysical Journal, March 2017, American Astronomical Society

     STScI Scientist Julien H Girard

143. 
     Near-infrared scattered light properties of the HR 4796 A dust ring

     Article • Astronomy and Astrophysics, March 2017, EDP Sciences

     STScI Scientist Julien H Girard

144. 
     VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy

     Article • Astronomy and Astrophysics, February 2017, EDP Sciences

     STScI Scientist Julien H Girard

145. 
     First Scattered-light Images of the Gas-rich Debris Disk around 49 Ceti

     Article • The Astrophysical Journal Letters, January 2017, American Astronomical Society

     STScI Scientist Julien H Girard

146. 
     Upper limits for mass and radius of objects around Proxima Cen from SPHERE/VLT

     Article • Monthly Notices of the Royal Astronomical Society Letters, January 2017, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

147. 
     Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893

     Article • Astronomy and Astrophysics, December 2016, EDP Sciences

     STScI Scientist Julien H Girard

148. 
     MASSIVE: A Bayesian analysis of giant planet populations around low-mass stars

     Article • Astronomy and Astrophysics, December 2016, EDP Sciences

     STScI Scientist Julien H Girard

149. 
     The SHARDDS survey: First resolved image of the HD114082 debris disk in the Lower Centaurus Crux with SPHERE

     Article • Astronomy and Astrophysics, November 2016, EDP Sciences

     STScI Scientist Julien H Girard

150. 
     Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE

     Article • Astronomy and Astrophysics, November 2016, EDP Sciences

     STScI Scientist Julien H Girard

151. 
     Multiple rings in the transition disk and companion candidates around RX J1615.3-3255

     Article • Astronomy and Astrophysics, November 2016, EDP Sciences

     STScI Scientist Julien H Girard

152. 
     The origin of the dusty envelope around Betelgeuse

     Article • Proceedings of the International Astronomical Union, November 2016, Cambridge University Press

     STScI Scientist Julien H Girard

153. 
     BP Piscium: its flaring disc imaged with SPHERE/ZIMPOL

     Article • Monthly Notices of the Royal Astronomical Society Letters, October 2016, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

154. 
     Sparse aperture masking at the VLT

     Article • Astronomy and Astrophysics, October 2016, EDP Sciences

     STScI Scientist Julien H Girard

155. 
     ABISM: an interactive image quality and Strehl ratio measurement tool for adaptive optics instruments

     Article • September 2016, SPIE

     STScI Scientist Julien H Girard

156. 
     Interferometric direct imaging properties of a BIGRE-DAM device in laboratory

     Article • August 2016, SPIE

     STScI Scientist Julien H Girard

157. 
     Pushing down with the contrast: scientific performances with SPHERE-IFS

     Article • August 2016, SPIE

     STScI Scientist Julien H Girard

158. 
     SPHERE IRDIS and IFS astrometric strategy and calibration

     Article • August 2016, SPIE

     STScI Scientist Julien H Girard

159. 
     Three years of harvest with the vector vortex coronagraph in the thermal infrared

     Article • August 2016, SPIE

     Dr Bruno Femenia Castella, STScI Scientist Julien H Girard

160. 
     SPHERE on-sky performance compared with budget predictions

     Article • August 2016, SPIE

     STScI Scientist Julien H Girard

161. 
     Sparse aperture masking with SPHERE

     Article • August 2016, SPIE

     STScI Scientist Julien H Girard

162. 
     Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor

     Article • Astronomy and Astrophysics, August 2016, EDP Sciences

     STScI Scientist Julien H Girard

163. 
     Speckle lifetime in XAO coronagraphic images: temporal evolution of SPHERE coronagraphic images

     Article • July 2016, SPIE

     STScI Scientist Julien H Girard

164. 
     ZELDA, a Zernike wavefront sensor for the fine measurement of quasi-static aberrations in coronagraphic systems: concept studies and results with VLT/SPHERE

     Article • July 2016, SPIE

     STScI Scientist Julien H Girard

165. 
     Tackling down the low wind effect on SPHERE instrument

     Article • July 2016, SPIE

     STScI Scientist Julien H Girard

166. 
     SAXO, the SPHERE extreme AO system: on-sky final performance and future improvements

     Article • July 2016, SPIE

     STScI Scientist Julien H Girard

167. 
     Quality control and data flow operations of SPHERE

     Article • July 2016, SPIE

     STScI Scientist Julien H Girard

168. 
     Training telescope operators and support astronomers at Paranal

     Article • July 2016, SPIE

     STScI Scientist Julien H Girard

169. 
     Discovery of concentric broken rings at sub-arcsec separations in the HD 141569A gas-rich, debris disk with VLT/SPHERE

     Article • Astronomy and Astrophysics, May 2016, EDP Sciences

     STScI Scientist Julien H Girard

170. 
     SAXO: the extreme adaptive optics system of SPHERE (I) system overview and global laboratory performance

     Article • Journal of Astronomical Telescopes Instruments and Systems, May 2016, SPIE

     STScI Scientist Julien H Girard

171. 
     An M-dwarf star in the transition disk of Herbig HD 142527

     Article • Astronomy and Astrophysics, May 2016, EDP Sciences

     STScI Scientist Julien H Girard

172. 
     Luminous blue variables: An imaging perspective on their binarity and near environment

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

173. 
     First light of the VLT planet finder SPHERE

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

174. 
     First light of the VLT planet finder SPHERE

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

175. 
     First light of the VLT planet finder SPHERE

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

176. 
     First light of the VLT planet finder SPHERE

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

177. 
     A narrow, edge-on disk resolved around HD 106906 with SPHERE

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

178. 
     The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits

     Article • Astronomy and Astrophysics, February 2016, EDP Sciences

     STScI Scientist Julien H Girard

179. 
     Adaptive Optics in High-Contrast Imaging

     Article • January 2016, Springer Science + Business Media

     STScI Scientist Julien H Girard

180. 
     Variability and dust filtration in the transition disk J160421.7-213028 observed in optical scattered light

     Article • Astronomy and Astrophysics, November 2015, EDP Sciences

     STScI Scientist Julien H Girard

181. 
     Fast-moving features in the debris disk around AU Microscopii

     Article • Nature, October 2015, Springer Science + Business Media

     STScI Scientist Julien H Girard

182. 
     PLUTO’s ATMOSPHERE FROM STELLAR OCCULTATIONS IN 2012 AND 2013

     Article • The Astrophysical Journal, September 2015, American Astronomical Society

     STScI Scientist Julien H Girard

183. 
     CONFIRMATION AND CHARACTERIZATION OF THE PROTOPLANET HD 100546 b—DIRECT EVIDENCE FOR GAS GIANT PLANET FORMATION AT 50 AU

     Article • The Astrophysical Journal, July 2015, American Astronomical Society

     STScI Scientist Julien H Girard

184. 
     The dust disk and companion of the nearby AGB star L2 Puppis

     Article • Astronomy and Astrophysics, June 2015, EDP Sciences

     STScI Scientist Julien H Girard

185. 
     The inner environment of Z Canis Majoris: High-contrast imaging polarimetry with NaCo

     Article • Astronomy and Astrophysics, May 2015, EDP Sciences

     STScI Scientist Julien H Girard

186. 
     WISE J061213.85-303612.5: a new T-dwarf binary candidate

     Article • Astronomy and Astrophysics, May 2015, EDP Sciences

     STScI Scientist Julien H Girard

187. 
     New constraints on the dust surrounding HR 4796A

     Article • Astronomy and Astrophysics, May 2015, EDP Sciences

     STScI Scientist Julien H Girard

188. 
     The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits

     Article • Astronomy and Astrophysics, January 2015, EDP Sciences

     STScI Scientist Julien H Girard

189. 
     DEEP THERMAL INFRARED IMAGING OF HR 8799 bcde: NEW ATMOSPHERIC CONSTRAINTS AND LIMITS ON A FIFTH PLANET

     Article • The Astrophysical Journal, October 2014, American Astronomical Society

     STScI Scientist Julien H Girard

190. 
     Discretized aperture mapping with a micro-lenses array for interferometric direct imaging

     Article • August 2014, SPIE

     STScI Scientist Julien H Girard

191. 
     DISCOVERY OF A COMPANION CANDIDATE IN THE HD 169142 TRANSITION DISK AND THE POSSIBILITY OF MULTIPLE PLANET FORMATION

     Article • The Astrophysical Journal Letters, August 2014, American Astronomical Society

     STScI Scientist Julien H Girard

192. 
     Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO

     Article • August 2014, SPIE

     STScI Scientist Julien H Girard

193. 
     Final performance and lesson-learned of SAXO, the VLT-SPHERE extreme AO: from early design to on-sky results

     Article • August 2014, SPIE

     STScI Scientist Julien H Girard

194. 
     Real-time Strehl and image quality performance estimator at Paranal Observatory

     Article • August 2014, SPIE

     STScI Scientist Julien H Girard

195. 
     Characterizing instrumental effects on polarization at a Nasmyth focus using NaCo

     Article • July 2014, SPIE

     STScI Scientist Julien H Girard

196. 
     Searching for visual companions of close Cepheids

     Article • Astronomy and Astrophysics, July 2014, EDP Sciences

     STScI Scientist Julien H Girard

197. 
     Very deep images of the innermost regions of theβPictoris debris disc atL′

     Article • Astronomy and Astrophysics, June 2014, EDP Sciences

     STScI Scientist Julien H Girard

198. 
     Ground-based transit observations of the super-Earth GJ 1214 b

     Article • Astronomy and Astrophysics, April 2014, EDP Sciences

     STScI Scientist Julien H Girard

199. 
     CHARACTERIZATION OF THE BENCHMARK BINARY NLTT 33370,

     Article • The Astrophysical Journal, February 2014, American Astronomical Society

     STScI Scientist Julien H Girard

200. 
     Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57–531906.1

     Article • Astronomy and Astrophysics, December 2013, EDP Sciences

     STScI Scientist Julien H Girard

201. 
     CONFIRMATION OF THE PLANET AROUND HD 95086 BY DIRECT IMAGING

     Article • The Astrophysical Journal Letters, December 2013, American Astronomical Society

     STScI Scientist Julien H Girard

202. 
     Searching for companions down to 2 AU fromβPictoris using theL′-band AGPM coronagraph on VLT/NACO

     Article • Astronomy and Astrophysics, November 2013, EDP Sciences

     STScI Scientist Julien H Girard

203. 
     ERRATUM: “DISCOVERY OF A PROBABLE 4-5 JUPITER-MASS EXOPLANET TO HD 95086 BY DIRECT-IMAGING” (2013, ApJL, 772, L15)

     Article • The Astrophysical Journal Letters, September 2013, American Astronomical Society

     STScI Scientist Julien H Girard

204. 
     Small-angle, high-contrast exoplanet imaging with the L-band AGPM vector vortex coronagraph now offered at the VLT

     Article • September 2013, SPIE

     STScI Scientist Julien H Girard

205. 
     Adaptive phase-mask coronagraph with amplitude and phase modulation for high dynamic range synchronous detection: APM2coronagraph

     Article • September 2013, SPIE

     STScI Scientist Julien H Girard

206. 
     A COMBINED VERY LARGE TELESCOPE AND GEMINI STUDY OF THE ATMOSPHERE OF THE DIRECTLY IMAGED PLANET, β PICTORIS b

     Article • The Astrophysical Journal, September 2013, American Astronomical Society

     STScI Scientist Julien H Girard

207. 
     A MULTIPLICITY CENSUS OF INTERMEDIATE-MASS STARS IN SCORPIUS-CENTAURUS

     Article • The Astrophysical Journal, August 2013, American Astronomical Society

     STScI Scientist Julien H Girard

208. 
     Prospects of detecting the polarimetric signature of the Earth-mass planetαCentauri B b with SPHERE/ZIMPOL

     Article • Astronomy and Astrophysics, July 2013, EDP Sciences

     STScI Scientist Julien H Girard

209. 
     DISCOVERY OF A PROBABLE 4-5 JUPITER-MASS EXOPLANET TO HD 95086 BY DIRECT IMAGING

     Article • The Astrophysical Journal Letters, July 2013, American Astronomical Society

     STScI Scientist Julien H Girard

210. 
     The near-infrared spectral energy distribution ofβPictoris b

     Article • Astronomy and Astrophysics, July 2013, EDP Sciences

     STScI Scientist Julien H Girard

211. 
     CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57–531906.1 AT 2 pc FROM THE SUN

     Article • The Astrophysical Journal, June 2013, American Astronomical Society

     STScI Scientist Julien H Girard

212. 
     Companion search around β Pictoris with the newly commissioned L'-band vector vortex coronagraph on VLT/NACO

     Article • Proceedings of the International Astronomical Union, June 2013, Cambridge University Press

     STScI Scientist Julien H Girard

213. 
     First High-Angular Resolution L′ Images of the β Pictoris Debris Disc with the VLT / NaCo

     Article • Proceedings of the International Astronomical Union, June 2013, Cambridge University Press

     STScI Scientist Julien H Girard

214. 
     Properties of the young gas giant planet β Pictoris b

     Article • Proceedings of the International Astronomical Union, June 2013, Cambridge University Press

     STScI Scientist Julien H Girard

215. 
     Successes and challenges of the APP Coronagraph

     Article • Proceedings of the International Astronomical Union, June 2013, Cambridge University Press

     STScI Scientist Julien H Girard

216. 
     β Pictoris b Orbital Properties

     Article • Proceedings of the International Astronomical Union, June 2013, Cambridge University Press

     STScI Scientist Julien H Girard

217. 
     A survey of young, nearby, and dusty stars conducted to understand the formation of wide-orbit giant planets

     Article • Astronomy and Astrophysics, May 2013, EDP Sciences

     STScI Scientist Julien H Girard

218. 
     Direct-imaging discovery of a 12–14 Jupiter-mass object orbiting a young binary system of very low-mass stars

     Article • Astronomy and Astrophysics, May 2013, EDP Sciences

     STScI Scientist Julien H Girard

219. 
     L’-band AGPM vector vortex coronagraph’s first light on VLT/NACO

     Article • Astronomy and Astrophysics, April 2013, EDP Sciences

     STScI Scientist Julien H Girard

220. 
     A YOUNG PROTOPLANET CANDIDATE EMBEDDED IN THE CIRCUMSTELLAR DISK OF HD 100546

     Article • The Astrophysical Journal Letters, February 2013, American Astronomical Society

     STScI Scientist Julien H Girard

221. 
     CORONAGRAPHIC OBSERVATIONS OF FOMALHAUT AT SOLAR SYSTEM SCALES

     Article • The Astrophysical Journal, January 2013, American Astronomical Society

     STScI Scientist Julien H Girard

222. 
     Flows of gas through a protoplanetary gap

     Article • Nature, January 2013, Springer Science + Business Media

     STScI Scientist Julien H Girard

223. 
     Holographic imaging of crowded fields: high angular resolution imaging with excellent quality at very low cost

     Article • Monthly Notices of the Royal Astronomical Society, December 2012, Oxford University Press (OUP)

     STScI Scientist Julien H Girard

224. 
     High-contrast imaging of the close environment of HD 142527

     Article • Astronomy and Astrophysics, September 2012, EDP Sciences

     STScI Scientist Julien H Girard

225. 
     Conceptual study for a sub-pupil instrument having 4 high order adaptive optics path for parallel multi-wavelength high contrast imaging, and medium resolution spectrometry

     Article • September 2012, SPIE

     STScI Scientist Julien H Girard

226. 
     NEW BROWN DWARF COMPANIONS TO YOUNG STARS IN SCORPIUS-CENTAURUS

     Article • The Astrophysical Journal Letters, September 2012, American Astronomical Society

     STScI Scientist Julien H Girard

227. 
     Extinction controlled adaptive mask coronagraph Lyot and phase mask dual concept for wide extinction area

     Article • September 2012, SPIE

     STScI Scientist Julien H Girard

228. 
     Image quality and high contrast improvements on VLT/NACO

     Article • September 2012, SPIE

     STScI Scientist Julien H Girard

229. 
     What can be retrieved from adaptive optics real-time data?

     Article • September 2012, SPIE

     STScI Scientist Julien H Girard

230. 
     Speckle imaging observations of 2005 YU55 with the NACO-VLT no-AO mode

     Article • September 2012, SPIE

     STScI Scientist Julien H Girard

231. 
     Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems

     Article • August 2012, SPIE

     STScI Scientist Julien H Girard

232. 
     Direct imaging of extra-solar planets in star forming regions

     Article • Astronomy and Astrophysics, August 2012, EDP Sciences

     STScI Scientist Julien H Girard

233. 
     Orbital characterization of theβPictoris b giant planet

     Article • Astronomy and Astrophysics, June 2012, EDP Sciences

     STScI Scientist Julien H Girard

234. 
     The position ofβPictoris b position relative to the debris disk

     Article • Astronomy and Astrophysics, June 2012, EDP Sciences

     STScI Scientist Julien H Girard

235. 
     Direct imaging with a dense aperture masking in comparison with a telescope or a hypertelelescope

     Article • September 2011, SPIE

     STScI Scientist Julien H Girard

236. 
     The hypertelescope at work with a BIGRE integral field unit

     Article • September 2011, SPIE

     STScI Scientist Julien H Girard

237. 
     On Our Multi-Wavelength Campaign of the 2011 Outburst of T Pyx

     Article • Proceedings of the International Astronomical Union, September 2011, Cambridge University Press

     STScI Scientist Julien H Girard

238. 
     SEARCHING FOR GAS GIANT PLANETS ON SOLAR SYSTEM SCALES: VLT NACO/APP OBSERVATIONS OF THE DEBRIS DISK HOST STARS HD172555 AND HD115892

     Article • The Astrophysical Journal Letters, July 2011, American Astronomical Society

     STScI Scientist Julien H Girard

239. 
     High angular resolution detection ofβ Pictoris b at 2.18 μm

     Article • Astronomy and Astrophysics, March 2011, EDP Sciences

     STScI Scientist Julien H Girard

240. 
     Spatially extended emission around the Cepheid RS Puppis in near-infrared hydrogen lines

     Article • Astronomy and Astrophysics, January 2011, EDP Sciences

     STScI Scientist Julien H Girard

241. 
     Adaptive optics observations of the T10 ultracool dwarf UGPS J072227.51-054031.2

     Article • Astronomy and Astrophysics, December 2010, EDP Sciences

     STScI Scientist Julien H Girard

242. 
     FIRST RESULTS FROM VERY LARGE TELESCOPE NACO APODIZING PHASE PLATE: 4 μm IMAGES OF THE EXOPLANET β PICTORIS b

     Article • The Astrophysical Journal Letters, September 2010, American Astronomical Society

     STScI Scientist Julien H Girard

243. 
     An apodizing phase plate coronagraph for VLT/NACO

     Article • July 2010, SPIE

     STScI Scientist Julien H Girard

244. 
     Evaluation of performance of the MACAO systems at the VLTI

     Article • July 2010, SPIE

     STScI Scientist Julien H Girard

245. 
     Speckle imaging with the SOAR and the very large telescopes

     Article • July 2010, SPIE

     STScI Scientist Julien H Girard

246. 
     Status and new operation modes of the versatile VLT/NaCo

     Article • July 2010, SPIE

     STScI Scientist Julien H Girard

247. 
     High-angular resolution observations of the Pistol star

     Article • Proceedings of the International Astronomical Union, July 2010, Cambridge University Press

     STScI Scientist Julien H Girard

248. 
     GUIELOA, the Mexican adaptive optics system: expected performance and operation

     Article • July 2008, SPIE

     STScI Scientist Julien H Girard

249. 
     Follow-up observations of binary ultra-cool dwarfs

     Article • Astronomy and Astrophysics, February 2008, EDP Sciences

     STScI Scientist Julien H Girard

250. 
     The Polychromatic Laser Guide Star for tilt measurement: progress report of the demonstrator at Observatoire de Haute Provence

     Article • September 2007, SPIE

     STScI Scientist Julien H Girard

251. 
     Techniques for measuring atmospheric aerosols at the high resolution fly’s eye experiment

     Article • Astroparticle Physics, February 2006, Elsevier

     STScI Scientist Julien H Girard

252. 
     Monocular measurement of the spectrum of UHE cosmic rays by the FADC detector of the HiRes experiment

     Article • Astroparticle Physics, March 2005, Elsevier

     STScI Scientist Julien H Girard

253. 
     Measurement of the Flux of Ultrahigh Energy Cosmic Rays from Monocular Observations by the High Resolution Fly’s Eye Experiment

     Article • Physical Review Letters, April 2004, American Physical Society (APS)

     STScI Scientist Julien H Girard

254. 
     Feasibility study of the polychromatic laser guide star

     Article • February 2003, SPIE

     STScI Scientist Julien H Girard

255. 
     Geometry and optics calibration for air fluorescence detectors using star light

     Article • Astroparticle Physics, December 2002, Elsevier

     STScI Scientist Julien H Girard

256. 
     A fiber-optic-based calibration system for the High Resolution Fly's Eye cosmic ray observatory

     Article • Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, March 2001, Elsevier

     STScI Scientist Julien H Girard