J/A+A/519/A98 Transit of exoplanet WASP-21b (Bouchy+, 2010)
WASP-21b: a hot-Saturn exoplanet transiting a thick disc star.
Bouchy F., Hebb, L., Skillen, I., Collier Cameron, A., 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.
<Astron. Astrophys. 519, A98 (2010)>
=2010A&A...519A..98B 2010A&A...519A..98B
ADC_Keywords: Planets ; Photometry
Keywords: planetary systems - techniques: photometric -
techniques: radial velocities
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 1.07RJup and mass of 0.30MJup,
WASP-21b has a density close to 0.24ρJup 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.
Objects:
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RA (2000) DE Designation(s)
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23 09 58.2 +18 23 46 WASP-21b = WASP-21b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 3814 SWASP photometric measurements of WASP-21
table2.dat 36 85 FTN (2m Faulkes Telescope North) measurements
table3.dat 36 84 RISE measurements (on 2m Liverpool telescope,
La Palma)
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See also:
J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/A+A/513/L3 : H-band thermal emission of WASP-19b (Anderson+, 2010)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
17- 25 F9.6 mag mag Corrected magnitude
29- 36 F8.6 mag e_mag ?=8.966989 Error of magnitude
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Acknowledgements:
Francois Bouchy, bouchy(at)iap.fr
(End) Francois Bouchy [IAP], Patricia Vannier [CDS] 31-May-2010