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Discovery of a warm, dusty giant planet around HIP65426

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  • G. Chauvin
  • S. Desidera
  • A. -M. Lagrange
  • A. Vigan
  • R. Gratton
  • M. Langlois
  • M. Bonnefoy
  • J. -L. Beuzit
  • M. Feldt
  • D. Mouillet
  • M. Meyer
  • A. Cheetham
  • A. Boccaletti
  • V. D'Orazi
  • R. Galicher
  • J. Hagelberg
  • A. -L. Maire
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  • J. Olofsson
  • M. Samland
  • T. O. B. Schmidt
  • E. Sissa
  • B. Charnay
  • M. Cudel
  • S. Daemgen
  • P. Delorme
  • P. Janin-Potiron
  • M. Janson
  • M. Keppler
  • H. Le Coroller
  • R. Ligi
  • G. D. Marleau
  • S. Messina
  • P. Molliere
  • C. Mordasini
  • A. Muller
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  • C. Perrot
  • L. Rodet
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  • C. Dominik
  • T. Henning
  • F. Menard
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  • L. Abe
  • J. Antichi
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  • K. Dohlen
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  • M. Kasper
  • F. Madec
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  • P. Martinez
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  • O. Moller-Nilsson
  • M. Llored
  • T. Moulin
  • A. Origné
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  • L. Weber
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  • S. Antoniucci
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  • J. -L. Baudino
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  • N. Engler
  • J. Girard
  • C. Gry
  • Q. Kral
  • T. Kopytova
  • E. Lagadec
  • J. Milli
  • C. Moutou
  • J. Schlieder
  • J. Szulágyi
  • C. Thalmann
  • Z. Wahhaj

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Original languageEnglish
JournalAstronomy & Astrophysics
Publication statusPublished - 18 Sep 2017


The SHINE program is a large high-contrast near-infrared survey of 600 young, nearby stars. It is aimed at searching for and characterizing new planetary systems using VLT/SPHERE's unprecedented high-contrast and high-angular resolution imaging capabilities. It also intends at placing statistical constraints on the occurrence and orbital properties of the giant planet population at large orbits as a function of the stellar host mass and age to test planet formation theories. We use the IRDIS dual-band imager and the IFS integral field spectrograph of SPHERE to acquire high-constrast coronagraphic differential near-infrared images and spectra of the young A2 star HIP65426. It is a member of the ~17 Myr old Lower Centaurus-Crux association. At a separation of 830 mas (92 au projected) from the star, we detect a faint red companion. Multi-epoch observations confirm that it shares common proper motion with HIP65426. Spectro-photometric measurements extracted with IFS and IRDIS between 0.95 and 2.2um indicate a warm, dusty atmosphere characteristic of young low surface-gravity L5-L7 dwarfs. Hot-start evolutionary models predict a luminosity consistent with a 6-12 MJup, Teff=1300-1600 K and R=1.5 RJup giant planet. Finally, the comparison with Exo-REM and PHOENIX BT-Settl synthetic atmosphere models gives consistent effective temperatures but with slightly higher surface gravity solutions of log(g)=4.0-5.0 with smaller radii (1.0-1.3 RJup). Given its physical and spectral properties, HIP65426b occupies a rather unique placement in terms of age, mass and spectral-type among the currently known imaged planets. It represents a particularly interesting case to study the presence of clouds as a function of particle size, composition, and location in the atmosphere, to search for signatures of non-equilibrium chemistry, and finally to test the theory of planet formation and evolution.

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  • astro-ph.EP

ID: 57878726