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A multi-wavelength analysis of the WASP-12 planetary system

Fossati, Luca; Haswell, Carole A. and Froning, Cynthia S. (2010). A multi-wavelength analysis of the WASP-12 planetary system. Proceedings of the International Astronomical Union, 6(S276) pp. 163–166.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1017/S1743921311020126
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Abstract

WASP-12 is a 2 Gyr old solar type star, hosting WASP-12b, one of the most irradiated transiting planets currently known. We observed WASP-12 in the UV with the Cosmic Origins Spectrograph (COS) on HST. The light curves we obtained in the three covered UV wavelength ranges, all of which contain many photospheric absorption lines, imply effective radii of 2.69±0.24 RJ, 2.18±0.18 RJ, and 2.66±0.22 RJ, suggesting that the planet is surrounded by an absorbing cloud which overfills the Roche lobe. We clearly detected enhanced transit depths at the wavelengths of the MgII h&k resonance lines. Spectropolarimetric analysis of the host star was also performed. We found no global magnetic field, but there were hints of atmospheric pollution, which might be connected to the very unusual activity of the host star.

Item Type: Journal Article
Copyright Holders: 2011 International Astronomical Union
ISSN: 1743-9213
Keywords: ultraviolet: stars; stars: magnetic fields; stars: individual (WASP-12); stars: activity; stars: abundances
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 32225
Depositing User: Stephen Serjeant
Date Deposited: 06 Feb 2012 16:39
Last Modified: 14 Nov 2012 12:06
URI: http://oro.open.ac.uk/id/eprint/32225
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