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Title: WASP-21b: a hot-Saturn exoplanet transiting a thick disc star
Authors: Bouchy, F.
Hebb, L.
Skillen, I.
Cameron, A. C.
Smalley, B.
Udry, S.
Anderson, D. R.
Boisse, I.
Enoch, B.
Haswell, C. A.
Hebrard, G.
Hellier, C.
Joshi, Y.
Kane, S. R.
Maxted, P. F. L.
Mayor, M.
Moutou, C.
Pepe, F.
Pollacco, D.
Queloz, D.
Segransan, D.
Simpson, E. K.
Smith, A. M. S.
Stempels, H. C.
Street, R.
Triaud, A. H. M. J.
West, R. G.
Wheatley, P. J.
First Published: 1-Sep-2010
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2010, 519
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.
DOI Link: 10.1051/0004-6361/201014817
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2010 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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