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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
  • D. Mesa
  • 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
  • S. Peretti
  • C. Perrot
  • L. Rodet
  • D. Rouan
  • A. Zurlo
  • C. Dominik
  • T. Henning
  • F. Menard
  • H. -M. Schmid
  • M. Turatto
  • S. Udry
  • F. Vakili
  • L. Abe
  • J. Antichi
  • A. Baruffolo
  • P. Baudoz
  • J. Baudrand
  • P. Blanchard
  • A. Bazzon
  • T. Buey
  • M. Carbillet
  • M. Carle
  • J. Charton
  • E. Cascone
  • R. Claudi
  • A. Costille
  • A. Deboulbe
  • V. De Caprio
  • K. Dohlen
  • D. Fantinel
  • P. Feautrier
  • T. Fusco
  • P. Gigan
  • E. Giro
  • D. Gisler
  • L. Gluck
  • N. Hubin
  • E. Hugot
  • M. Jaquet
  • M. Kasper
  • F. Madec
  • Y. Magnard
  • P. Martinez
  • D. Maurel
  • D. Le Mignant
  • O. Moller-Nilsson
  • M. Llored
  • T. Moulin
  • A. Origné
  • A. Pavlov
  • D. Perret
  • C. Petit
  • J. Pragt
  • P. Puget
  • P. Rabou
  • J. Ramos
  • R. Rigal
  • S. Rochat
  • R. Roelfsema
  • G. Rousset
  • A. Roux
  • B. Salasnich
  • J. -F. Sauvage
  • A. Sevin
  • C. Soenke
  • E. Stadler
  • M. Suarez
  • L. Weber
  • F. Wildi
  • S. Antoniucci
  • J. -C. Augereau
  • J. -L. Baudino
  • W. Brandner
  • 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
DOIs
Publication statusPublished - 18 Sep 2017

Abstract

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.

    Research areas

  • astro-ph.EP

ID: 57878726