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WASP-1b and WASP-2b : two new transiting exoplanets detected with SuperWASP and SOPHIE
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(2007) WASP-1b and WASP-2b : two new transiting exoplanets detected with SuperWASP and SOPHIE. Monthly Notices of the Royal Astronomical Society, Vol.375 (No.3). pp. 951-957. doi:10.1111/j.1365-2966.2006.11350.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2006.11350.x
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 R-Jup, whereas WASP-2b has a radius in the range 0.65-1.26 R-Jup.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Wiley | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 1 March 2007 | ||||
Dates: |
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Volume: | Vol.375 | ||||
Number: | No.3 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 951-957 | ||||
DOI: | 10.1111/j.1365-2966.2006.11350.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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