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WASP-121 b : a hot Jupiter close to tidal disruption transiting an active F star
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(2016) WASP-121 b : a hot Jupiter close to tidal disruption transiting an active F star. Monthly Notices of the Royal Astronomical Society, 458 (4). pp. 4025-4043. doi:10.1093/mnras/stw522 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stw522
Abstract
We present the discovery by the WASP-South survey of WASP-121 b, a new remarkable short-period transiting hot Jupiter. The planet has a mass of 1.183+0.064−0.062 MJup, a radius of 1.865 ± 0.044 RJup, and transits every 1.274 9255+0.000 0020−0.000 0025 days an active F6-type main-sequence star (V = 10.4, 1.353+0.080 −0.079 M, 1.458 ± 0.030 R, Teff = 6460 ± 140 K). A notable property of WASP-121 b is that its orbital semimajor axis is only ~1.15 times larger than its Roche limit, which suggests that the planet is close to tidal disruption. Furthermore, its large size and extreme irradiation (~7.1 109 erg s−1 cm−2) make it an excellent target for atmospheric studies via secondary eclipse observations. Using the TRAnsiting Planets and PlanetesImals Small Telescope, we indeed detect its emission in the z'-band at better than ~4σ, the measured occultation depth being 603 ± 130 ppm. Finally, from a measurement of the Rossiter–McLaughlin effect with the CORALIE spectrograph, we infer a sky-projected spin-orbit angle of 257.8+5.3−5.5. This result may suggest a significant misalignment between the spin axis of the host star and the orbital plane of the planet. If confirmed, this high misalignment would favour a migration of the planet involving strong dynamical events with a third body.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 0035-8711 | ||||||||
| Official Date: | 7 March 2016 | ||||||||
| Dates: |
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| Volume: | 458 | ||||||||
| Number: | 4 | ||||||||
| Page Range: | pp. 4025-4043 | ||||||||
| DOI: | 10.1093/mnras/stw522 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 6 July 2016 | ||||||||
| Date of first compliant Open Access: | 6 July 2016 | ||||||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Fonds national de la recherche scientifique (Belgium) (FNRS), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Seventh Framework Programme (European Commission) (FP7) | ||||||||
| Grant number: | 2.5.594.09.F (FNRS), 336480 (FP7), P300P2-147773 (SNSF), 627202 (FP7) |
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