Article (Scientific journals)
WASP-71b: a bloated hot Jupiter in an 2.9-day, prograde orbit around an evolved F8 star
Smith, A. M. S.; Anderson, D. R.; Bouchy, F. et al.
2013In Astronomy and Astrophysics, 552, p. 120
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We report the discovery by the WASP transit survey of a highly-irradiated, massive (2.242 +/- 0.080 MJup) planet which transits a bright (V = 10.6), evolved F8 star every 2.9 days. The planet, WASP-71b, is larger than Jupiter (1.46 +/- 0.13 RJup), but less dense (0.71 +/- 0.16 {\rho}Jup). We also report spectroscopic observations made during transit with the CORALIE spectrograph, which allow us to make a highly-significant detection of the Rossiter-McLaughlin effect. We determine the sky-projected angle between the stellar-spin and planetary-orbit axes to be {\lambda} = 20.1 +/- 9.7 degrees, i.e. the system is 'aligned', according to the widely-used alignment criteria that systems are regarded as misaligned only when {\lambda} is measured to be greater than 10 degrees with 3-{\sigma} confidence. WASP-71, with an effective temperature of 6059 +/- 98 K, therefore fits the previously observed pattern that only stars hotter than 6250 K are host to planets in misaligned orbits. We emphasise, however, that {\lambda} is merely the sky-projected obliquity angle; we are unable to determine whether the stellar-spin and planetary-orbit axes are misaligned along the line-of-sight. With a mass of 1.56 +/- 0.07 Msun, WASP-71 was previously hotter than 6250 K, and therefore might have been significantly misaligned in the past. If so, the planetary orbit has been realigned, presumably through tidal interactions with the cooling star's growing convective zone.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Smith, A. M. S.
Anderson, D. R.
Bouchy, F.
Collier Cameron, A.
Doyle, A. P.
Fumel, Aurélie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Hébrard, G.
Hellier, C.
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Lendl, M.
Maxted, P. F. L.
Moutou, C.
Pepe, F.
Pollacco, D.
Queloz, D.
Santerne, A.
Segransan, D.
Smalley, B.
Triaud, A. H. M. J.
Udry, S.
West, R. G.
More authors (12 more) Less
Language :
English
Title :
WASP-71b: a bloated hot Jupiter in an 2.9-day, prograde orbit around an evolved F8 star
Publication date :
01 November 2013
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
552
Pages :
120
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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