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WASP-21b: a hot-Saturn exoplanet transiting a thick disc star
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2010 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 519, A98- p.Article in journal (Refereed) Published
Abstract [en]

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 R-Jup and mass of 0.30 M-Jup, WASP-21b has a density close to 0.24 rho(Jup) 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.

Place, publisher, year, edition, pages
2010. Vol. 519, A98- p.
Keyword [en]
planetary systems, techniques: photometric, techniques: radial velocities
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-133752DOI: 10.1051/0004-6361/201014817ISI: 000283297300098OAI: oai:DiVA.org:uu-133752DiVA: diva2:370196
Available from: 2010-11-15 Created: 2010-11-15 Last updated: 2012-02-27Bibliographically approved

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Stempels, H. C.
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