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The hot Jupiter WASP-­121 b: A planet heading towards its doom (contributed talk)
Delrez, Laetitia
2015I° Advanced School on Exoplanetary Science
 

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Abstract :
[en] We present here the discovery by the WASP-South survey, in close collaboration with the Euler and TRAPPIST telescopes, of WASP-121 b, a new remarkable short-period transiting hot Jupiter. WASP-121 b is a very inflated (1.86 Rjup) Jupiter-mass (1.18 Mjup) planet that transits every 1.27 days a bright active F6V star. A notable property of WASP-121b is that its orbital semi-major axis is only 15% larger than its Roche limit, which suggests that the planet might be close to tidal disruption. Furthermore, its large size and extreme irradiation (7.1 10^9 erg s^-1 cm^-2) make it an excellent target for atmospheric studies via secondary eclipse observations. Using the TRAPPIST robotic telescope, we indeed detect its thermal emission in the z’-band at better than ~4sigma, the measured occultation depth being 603+-130 ppm. This measurement is a first for a ground-based 60cm telescope. Finally, from a measurement of the Rossiter-McLaughlin effect with the CORALIE spectrograph, we infer a sky-projected spin-orbit angle of 257.8+-6 deg. This result indicates a significant misalignment between the spin axis of the host star and the orbital plane of the planet, the planet being in a nearly polar orbit.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Delrez, Laetitia ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Language :
English
Title :
The hot Jupiter WASP-­121 b: A planet heading towards its doom (contributed talk)
Publication date :
28 May 2015
Event name :
I° Advanced School on Exoplanetary Science
Event place :
Vietri sul Mare, Italy
Event date :
25-29 mai 2015
Available on ORBi :
since 31 May 2015

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