Discovery of a warm, dusty giant planet around HIP65426
Discovery of a warm, dusty giant planet around HIP65426
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.
J. -L. Baudino、J. Charton、P. Molliere、D. Maurel、R. Gratton、M. Keppler、C. Gry、P. Blanchard、J. Hagelberg、P. Delorme、J. -L. Beuzit、A. Sevin、R. Rigal、D. Fantinel、A. Boccaletti、J. Pragt、J. -C. Augereau、F. Vakili、L. Weber、B. Charnay、S. Daemgen、C. Thalmann、T. Buey、S. Rochat、J. Baudrand、C. Mordasini、M. Feldt、A. Baruffolo、S. Antoniucci、M. Cudel、M. Bonavita、E. Hugot、M. Suarez、D. Perret、D. Le Mignant、A. Costille、Y. Magnard、C. Petit、P. Janin-Potiron、S. Udry、M. Turatto、J. Antichi、R. Roelfsema、A. Vigan、J. Girard、T. O. B. Schmidt、J. Schlieder、P. Martinez、M. Langlois、V. De Caprio、V. D'Orazi、J. Ramos、E. Giro、P. Feautrier、M. Carle、Q. Kral、D. Gisler、P. Gigan、T. Kopytova、R. Ligi、E. Stadler、R. Galicher、H. Le Coroller、D. Mesa、L. Abe、T. Henning、C. Dominik、R. Claudi、M. Kasper、M. Jaquet、D. Mouillet、A. -M. Lagrange、B. Salasnich、A. Roux、F. Madec、K. Dohlen、C. Soenke、A. Cheetham、M. Janson、A. Zurlo、J. Milli、E. Lagadec、E. Cascone、J. -F. Sauvage、A. Muller、A. Pavlov、A. Orign¨|、F. Menard、M. Carbillet、N. Hubin、S. Messina、L. Gluck、M. Llored、G. Rousset、T. Fusco、G. Chauvin、E. Sissa、W. Brandner、A. Deboulbe、J. Szul¨￠gyi、B. Biller、A. -L. Maire、M. Bonnefoy、T. Moulin、L. Rodet、M. Samland、P. Rabou、A. Bazzon、N. Engler、M. Meyer、S. Peretti、P. Baudoz、D. Rouan、C. Moutou、O. Moller-Nilsson、H. -M. Schmid、C. Perrot、F. Wildi、G. D. Marleau、Z. Wahhaj、S. Desidera、P. Puget、J. Olofsson
天文学
J. -L. Baudino,J. Charton,P. Molliere,D. Maurel,R. Gratton,M. Keppler,C. Gry,P. Blanchard,J. Hagelberg,P. Delorme,J. -L. Beuzit,A. Sevin,R. Rigal,D. Fantinel,A. Boccaletti,J. Pragt,J. -C. Augereau,F. Vakili,L. Weber,B. Charnay,S. Daemgen,C. Thalmann,T. Buey,S. Rochat,J. Baudrand,C. Mordasini,M. Feldt,A. Baruffolo,S. Antoniucci,M. Cudel,M. Bonavita,E. Hugot,M. Suarez,D. Perret,D. Le Mignant,A. Costille,Y. Magnard,C. Petit,P. Janin-Potiron,S. Udry,M. Turatto,J. Antichi,R. Roelfsema,A. Vigan,J. Girard,T. O. B. Schmidt,J. Schlieder,P. Martinez,M. Langlois,V. De Caprio,V. D'Orazi,J. Ramos,E. Giro,P. Feautrier,M. Carle,Q. Kral,D. Gisler,P. Gigan,T. Kopytova,R. Ligi,E. Stadler,R. Galicher,H. Le Coroller,D. Mesa,L. Abe,T. Henning,C. Dominik,R. Claudi,M. Kasper,M. Jaquet,D. Mouillet,A. -M. Lagrange,B. Salasnich,A. Roux,F. Madec,K. Dohlen,C. Soenke,A. Cheetham,M. Janson,A. Zurlo,J. Milli,E. Lagadec,E. Cascone,J. -F. Sauvage,A. Muller,A. Pavlov,A. Orign¨|,F. Menard,M. Carbillet,N. Hubin,S. Messina,L. Gluck,M. Llored,G. Rousset,T. Fusco,G. Chauvin,E. Sissa,W. Brandner,A. Deboulbe,J. Szul¨￠gyi,B. Biller,A. -L. Maire,M. Bonnefoy,T. Moulin,L. Rodet,M. Samland,P. Rabou,A. Bazzon,N. Engler,M. Meyer,S. Peretti,P. Baudoz,D. Rouan,C. Moutou,O. Moller-Nilsson,H. -M. Schmid,C. Perrot,F. Wildi,G. D. Marleau,Z. Wahhaj,S. Desidera,P. Puget,J. Olofsson.Discovery of a warm, dusty giant planet around HIP65426[EB/OL].(2017-07-05)[2025-06-21].https://arxiv.org/abs/1707.01413.点此复制
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