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Discovery of a warm, dusty giant planet around HIP65426 | | 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
; B. Biller
; A. Boccaletti
; V. D'Orazi
; R. Galicher
; J. Hagelberg
; A.-L. Maire
; D. Mesa
; J. Olofsson
; M. Samland
; T.O.B. Schmidt
; E. Sissa
; M. Bonavita
; 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
; | | Date: |
5 Jul 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. | | Source: | arXiv, 1707.1413 | | Services: | Forum | Review | PDF | Favorites | |
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