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WASP-21b : a hot-Saturn exoplanet transiting a thick disc star
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(2010) WASP-21b : a hot-Saturn exoplanet transiting a thick disc star. Astronomy & Astrophysics, Vol.519 (No.A98). doi:10.1051/0004-6361/201014817 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201014817
Abstract
We report the discovery of WASP-21b, a new transiting exoplanet discovered by the Wide Angle Search for Planets (WASP) Consortium and established and characterized with the FIES, SOPHIE, CORALIE and HARPS fiber-fed echelle spectrographs. A 4.3-d period, 1.1% transit depth and 3.4-h duration are derived for WASP-21b using SuperWASP-North and high precision photometric observations at the Liverpool Telescope. Simultaneous fitting to the photometric and radial velocity data with a Markov Chain Monte Carlo procedure leads to a planet in the mass regime of Saturn. With a radius of 1.07 RJup and mass of 0.30 MJup, WASP-21b
has a density close to 0.24 ρJup corresponding to the distribution peak at low density of transiting gaseous giant planets. With a host star metallicity [Fe/H] of –0.46, WASP-21b strengthens the correlation between planetary density and host star metallicity for the five
known Saturn-like transiting planets. Furthermore there are clear indications that WASP-21b is the first transiting planet belonging to the thick disc.
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): | WASP-21b (Planet), Extrasolar planets, Stars with planets, Transits | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | September 2010 | ||||
Dates: |
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Volume: | Vol.519 | ||||
Number: | No.A98 | ||||
DOI: | 10.1051/0004-6361/201014817 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Institut national des sciences de l'univers (France), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), France. Agence nationale de la recherche (ANR) | ||||
Grant number: | ANR-08-JCJC-0102-01 (ANR) |
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