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

Published online by Cambridge University Press:  10 November 2011

Luca Fossati ,
Carole A. Haswell  and
Cynthia S. Froning
Luca Fossati
Affiliation:
Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes MK7 6AA, UK email: [email protected], [email protected]
Carole A. Haswell
Affiliation:
Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes MK7 6AA, UK email: [email protected], [email protected]
Cynthia S. Froning
Affiliation:
Center for Astrophysics and Space Astronomy, University of Colorado, 593 UCB, Boulder, CO 80309-0593, USA email: [email protected]
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Abstract

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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.

Keywords

ultraviolet: starsstars: magnetic fieldsstars: individual (WASP-12)stars: activitystars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S276: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution , October 2010 , pp. 163 - 166
Copyright
Copyright © International Astronomical Union 2011

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