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Discovery and characterization of WASP-6b, an inflated sub-Jupiter mass planet transiting a solar-type star

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Gillon, M., Anderson, D. R., Triaud, A. H. M. J., Hellier, Coel, Maxted, Pierre, Pollacco, Don, Queloz, Didier, Smalley, Barry, West, Richard G., Wilson, D. M. (David M.) et al.

. (2009) Discovery and characterization of WASP-6b, an inflated sub-Jupiter mass planet transiting a solar-type star. Astronomy & Astrophysics, Vol.501 (No.2). pp. 785-792. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/200911749

Abstract

We report the discovery of WASP-6b, an inflated sub-Jupiter mass planet transiting every $ 3.3610060^{\rm + 0.0000022 }_ $ days a mildly metal-poor solar-type star of magnitude V = 11.9. A combined analysis of the WASP photometry, high-precision followup transit photometry and radial velocities yield a planetary mass $M_{\rm p} = 0.503^_$ $M_{\rm J}$ and radius $R_{\rm p} = 1.224^_$ $R_{\rm J}$, resulting in a density $\rho_{\rm p} = 0.27 \pm 0.05$ $\rho_{\rm J}$. The mass and radius for the host star are $M_\ast = 0.88^_$ $M_\odot$ and $R_\ast = 0.870^_$ $R_\odot$. The non-zero orbital eccentricity $e = 0.054^{\rm +0.018}_$ that we measure suggests that the planet underwent a massive tidal heating ~1 Gyr ago that could have contributed to its inflated radius. High-precision radial velocities obtained during a transit allow us to measure a sky-projected angle between the stellar spin and orbital axis $\beta = 11^_$ deg. In addition to similar published measurements, this result favors a dominant migration mechanism based on tidal interactions with a protoplanetary disk.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars -- Motion in line of sight, Eclipsing binaries, Astronomical spectroscopy, Planets -- Spectra, Planets -- Orbits
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	July 2009
Volume:	Vol.501
Number:	No.2
Page Range:	pp. 785-792
Identification Number:	10.1051/0004-6361/200911749
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	HARPS consortium
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URI:	http://wrap.warwick.ac.uk/id/eprint/2259