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J/A+A/605/L9           NIR spectrum of exoplanet HIP 65426b     (Chauvin+, 2017)

Discovery of a warm, dusty giant planet around HIP 65426. Chauvin G., Desidera S., Lagrange A.-M., Vigan A., Gratton R., Langlois M., Bonnefoy M., Beuzit J.-L., Feldt M., Mouillet D., Meyer M., Cheetham A., Biller B., Boccaletti A., D'orazi V., Galicher R., Hagelberg J., Maire A.-L., Mesa D., Olofsson J., Samland M., Schmidt T.O.B., Sissa E., Bonavita M., Charnay B., Cudel M., Daemgen S., Delorme P., Janin-Potiron P., Janson M., Keppler M., Le Coroller H., Ligi R., Marleau G.D., Messina S., Molliere P., Mordasini C., Muller A., Peretti S., Perrot C., Rodet L., Rouan D., Zurlo A., Dominik C., Henning T., Menard F., Schmid H.-M., Turatto M., Udry S., Vakili F., Abe L., Antichi J., Baruffolo A., Baudoz P., Baudrand J., Blanchard P., Bazzon A., Buey T., Carbillet M., Carle M., Charton J., Cascone E., Claudi R., Costille A., Deboulbe A., De Caprio V., Dohlen K., Fantinel D., Feautrier P., Fusco T., Gigan P., Giro E., Gisler D., Gluck L., Hubin N., Hugot E., Jaquet M., Kasper M., Madec F., Magnard Y., Martinez P., Maurel D., Le Mignant D., Moller-Nilsson O., Llored M., Moulin T., Origne A., Pavlov A., Perret D., Petit C., Pragt J., Puget P., Rabou P., Ramos J., Rigal R., Rochat S., Roelfsema R., Rousset G., Roux A., Salasnich B., Sauvage J.-F., Sevin A., Soenke C., Stadler E., Suarez M., Weber L., Wildi F., Antoniucci S., Augereau J.-C., Baudino J.-L., Brandner W., Engler N., Girard J., Gry C., Kral Q., Kopytova T., Lagadec E., Milli J., Moutou C., Schlieder J., Szulagyi J., Thalmann C., Wahhaj Z. <Astron. Astrophys., 605, L9 (2017)> =2017A&A...605L...9C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Spectra, infrared Keywords: instrumentation: adaptive optics - instrumentation: high angular resolution - methods: observational - planets and satellites: atmospheres - planets and satellites: formation Abstract: 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. 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 ∼17Myr old Lower Centaurus-Crux association. At a separation of 830 mas (92au 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 2.2µm indicate a warm, dusty atmosphere characteristic of young low-surface-gravity L5-L7 dwarfs. Hot-start evolutionary models predict a luminosity consistent with a 6-12MJup, Teff=1300-1600K and R=1.5±0.1RJup 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 (1.0-1.3RJup). 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. Description: HIP 65426 was observed on May 30th, 2016 under unstable conditions (strong wind) with SPHERE. The observations were then repeated on June 26th, 2016. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 13 24 36.10 -51 30 16.0 HIP 65426 = HD 116434 -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file hip65426.dat 26 38 HIP65426b, VLT/SPHERE-IRDIFS spectrum
Byte-by-byte Description of file: hip65426.dat
Bytes Format Units Label Explanations
1- 7 F7.5 um lambda Wavelength 9- 16 F8.6 --- NFlux Normalized flux 18- 26 F9.7 --- e_NFlux rms uncertainty on NFlux
Acknowledgements: Gael Chauvin, gael.chauvin(at)
(End) Patricia Vannier [CDS] 25-Oct-2017
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