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Title: WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE
Authors: Hebb, L.
Horne, K.
Lister, T. A.
Triaud, A. H. M. J.
Bouchy, F.
Hébrard, G.
Bouchy, F.
Maxted, P.
Smalley, B.
Wilson, D. M.
Evans, A.
Hellier, C.
Lister, T. A.
Pollacco, D.
Street, R. A.
Christian, D. J.
Fitzsimmons, A.
Keenan, F. P.
Ryans, R.
Pont, F.
Mayor, M.
Queloz, D.
Udry, S.
Skillen, I.
West, R. G.
Osborne, J.
Aigrain, S.
Hodgkin, S. T.
Irwin, J.
Clarkson, W. I.
Enoch, B.
Haswell, C. A.
Norton, A. J.
Parley, N.
Fleenor, M.
Gillon, M.
Kane, S. R.
Loeillet, B.
Moutou, C.
Wheatley, P. J.
Cameron, C. A.
First Published: 1-Mar-2007
Publisher: Royal Astronomical Society (RAS)
Citation: Monthly Notices of the Royal Astronomical Society, 2007, 375 (3), pp. 951-957
Abstract: We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219–0005465 (GSC 02265–00107 = WASP–1) and USNO-B1.0 0964–0543604 (GSC 00522–01199 = WASP–2). Both stars were identified as being likely host stars of transiting exoplanets in the 2004 SuperWASP wide-field transit survey. Using the newly commissioned radial-velocity spectrograph SOPHIE at the Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital radial-velocity variations with amplitudes characteristic of planetary-mass companions and in-phase with the photometric orbits. Line-bisector studies rule out faint blended binaries as the cause of either the radial-velocity variations or the transits. We perform preliminary spectral analyses of the host stars, which together with their radial-velocity variations and fits to the transit light curves yield estimates of the planetary masses and radii. WASP-1b and WASP-2b have orbital periods of 2.52 and 2.15 d, respectively. Given mass estimates for their F7V and K1V primaries, we derive planet masses 0.80–0.98 and 0.81–0.95 times that of Jupiter, respectively. WASP-1b appears to have an inflated radius of at least 1.33 RJup, whereas WASP-2b has a radius in the range 0.65–1.26 RJup.
DOI Link: 10.1111/j.1365-2966.2006.11350.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2007 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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