Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2017

Discovery of a warm, dusty giant planet around HIP 65426

G. Chauvin (1, 2) , S. Desidera (3) , A.M. Lagrange (1) , Arthur Vigan (4) , R. Gratton (3) , M. Langlois (4, 5) , M. Bonnefoy (1) , J. Beuzit (1) , M. Feldt (6) , D. Mouillet (1) , M. Meyer (7, 8) , A. Cheetham (9) , B. Biller (6, 10) , A. Boccaletti (11) , V. D’orazi (3) , R. Galicher (11) , J. Hagelberg (1) , L. Maire (6) , D. Mesa (3) , J. Olofsson (6, 12) , M. Samland (6) , T.O.B. Schmidt (11) , E. Sissa (3) , M. Bonavita (3, 10) , B. Charnay (11) , M. Cudel (1) , S. Daemgen (7) , P. Delorme (1) , P. Janin-Potiron (13) , M. Janson (6, 14) , M. Keppler (6) , H. Le Coroller (4) , R. Ligi (4) , G.D. Marleau (6, 15) , S. Messina (3, 16) , P. Mollière (6) , C. Mordasini (6, 15) , A. Muller (6) , S. Peretti (9) , C. Perrot (11) , L. Rodet (1) , D. Rouan (11) , A. Zurlo (3, 17) , C. Dominik (18) , T. Henning (6) , F. Ménard (1) , H.M. Schmid (7) , M. Turatto (3) , S. Udry (9) , F. Vakili (13) , L. Abe (13) , J. Antichi (19) , A. Baruffolo (3) , P. Baudoz (11) , J. Baudrand (11) , P. Blanchard (4) , A. Bazzon (7) , T. Buey (11) , M. Carbillet (13) , M. Carle (4) , J. Charton (1) , E. Cascone (20) , R. Claudi (3) , A. Costille (4) , A. Deboulbe (1) , V. de Caprio (20) , K. Dohlen (4) , D. Fantinel (3) , P. Feautrier (1) , T. Fusco (21) , P. Gigan (11) , E. Giro (3) , D. Gisler (7) , L. Gluck (1) , N. Hubin (22) , E. Hugot (4) , M. Jaquet (4) , M. Kasper (22) , F. Madec (4) , Y. Magnard (1) , P. Martinez (13) , D. Maurel (1) , D. Le Mignant (4) , O. Möller-Nilsson (6) , M. Llored (4) , T. Moulin (1) , A. Origné (4) , A. Pavlov (6) , D. Perret (11) , C. Petit (21) , J. Pragt (23) , P. Puget (1) , P. Rabou (1) , J. Ramos (6) , R. Rigal (18) , S. Rochat (1) , R. Roelfsema (23) , G. Rousset (11) , A. Roux (1) , B. Salasnich (3) , J. Sauvage (21) , A. Sevin (11) , C. Soenke (22) , E. Stadler (1) , M. Suarez (19) , L. Weber (9) , F. Wildi (9) , S. Antoniucci (24) , C. Augereau (1) , J. Baudino (11, 25) , W. Brandner (6) , N. Engler (7) , J. Girard (1, 26) , C. Gry (4) , Q. Kral (11, 27) , T. Kopytova (6, 28, 29) , Eric Lagadec (13) , J. Milli (1, 26) , C. Moutou (4, 30) , J. Schlieder (6, 31) , J. Szulagyi (7) , C. Thalmann (7) , Z. Wahhaj (4, 26)
1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
2 LFCA - Laboratoire Franco-Chilien d'Astronomie
3 OAPD - INAF - Osservatorio Astronomico di Padova
4 LAM - Laboratoire d'Astrophysique de Marseille
5 CRAL - Centre de Recherche Astrophysique de Lyon
6 MPIA - Max-Planck-Institut für Astronomie = Max Planck Institute for Astronomy
7 Institute of Astronomy [ETH Zürich]
8 UMich - Université du Michigan = University of Michigan [Ann Arbor]
9 ObsGE - Observatoire Astronomique de l'Université de Genève
10 SUPA, Institute for Astronomy
11 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
12 Instituto de Fisica y Astronomia [Valparaiso]
13 Observatoire de la Côte d'Azur
14 Stockholm University
15 Physikalisches Institut [Bern]
16 OACT - INAF - Osservatorio Astrofisico di Catania
17 UDP - Universidad Diego Portales [Santiago - Chili]
18 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
19 OAA - INAF- Osservatorio Astrofisico di Arcetri
20 OAC - INAF - Osservatorio Astronomico di Capodimonte
21 ONERA - The French Aerospace Lab [Châtillon]
22 ESO - European Southern Observatory
23 NOVA - NOVA Optical Infrared Instrumentation Group
24 OAR - INAF - Osservatorio Astronomico di Roma
25 Sub-department of Astrophysics [Oxford]
26 ESO - European Southern Observatory [Santiago]
27 Institute of Astronomy [Cambridge]
28 SESE - ASU School of Earth and Space Exploration
29 UrFU - Ural Federal University [Ekaterinburg]
30 CFHT - Canada-France-Hawaii Telescope Corporation
31 GSFC - NASA Goddard Space Flight Center
M. Carbillet
T. Fusco
P. Martinez
N. Engler
C. Gry
Eric Lagadec

Résumé

Aims. The SHINE program is a high-contrast near-infrared survey of 600 young, nearby stars aimed at searching for and characterizing new planetary systems using VLT/SPHERE’s unprecedented high-contrast and high-angular-resolution imaging capabilities. It is also intended to place statistical constraints on the rate, mass and orbital distributions of the giant planet population at large orbits as a function of the stellar host mass and age to test planet-formation theories. Methods. We used the IRDIS dual-band imager and the IFS integral field spectrograph of SPHERE to acquire high-contrast coronagraphic differential near-infrared images and spectra of the young A2 star HIP 65426. It is a member of the ~17 Myr old Lower Centaurus-Crux association. Results. 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 HIP 65426. Spectro-photometric measurements extracted with IFS and IRDIS between 0.95 and 2.2 μm 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 ± 0.1 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). Conclusions. Given its physical and spectral properties, HIP 65426 b 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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hal-01717756 , version 1 (28-02-2018)

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G. Chauvin, S. Desidera, A.M. Lagrange, Arthur Vigan, R. Gratton, et al.. Discovery of a warm, dusty giant planet around HIP 65426. Astronomy & Astrophysics - A&A, 2017, 605, pp.L9. ⟨10.1051/0004-6361/201731152⟩. ⟨hal-01717756⟩
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