The Library
WASP-71b : a bloated hot Jupiter in a 2.9-day, prograde orbit around an evolved F8 star
Tools
Tools
Tools
(2013) WASP-71b : a bloated hot Jupiter in a 2.9-day, prograde orbit around an evolved F8 star. Astronomy & Astrophysics, Volume 552 . Article number A120. doi:10.1051/0004-6361/201220727 Research output not available from this repository, contact author.
Official URL: http://dx.doi.org/10.1051/0004-6361/201220727
Abstract
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 ρJup). 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 λ = 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 λ is measured to be greater than 10 degrees with 3-σ 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 λ 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 M⊙, 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.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||
| Publisher: | EDP Sciences | ||||||
| ISSN: | 0004-6361 | ||||||
| Official Date: | 12 November 2013 | ||||||
| Dates: |
|
||||||
| Volume: | Volume 552 | ||||||
| Article Number: | Article number A120 | ||||||
| DOI: | 10.1051/0004-6361/201220727 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
