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An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b
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(2009) An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b. Nature, Vol.460 (No.7259). pp. 1098-1100. doi:10.1038/nature08245 ISSN 0028-0836.
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Official URL: http://dx.doi.org/10.1038/nature08245
Abstract
The 'hot Jupiters' that abound in lists of known extrasolar planets are thought to have formed far from their host stars, but migrate inwards through interactions with the proto-planetary disk from which they were born(1,2), or by an alternative mechanism such as planet-planet scattering(3). The hot Jupiters closest to their parent stars, at orbital distances of only similar to 0.02 astronomical units, have strong tidal interactions(4,5), and systems such as OGLE-TR-56 have been suggested as tests of tidal dissipation theory(6,7). Here we report the discovery of planet WASP-18b with an orbital period of 0.94 days and a mass of ten Jupiter masses (10 M-Jup), resulting in a tidal interaction an order of magnitude stronger than that of planet OGLE-TR-56b. Under the assumption that the tidal-dissipation parameter Q of the host star is of the order of 10 6, as measured for Solar System bodies and binary stars and as often applied to extrasolar planets, WASP-18b will be spiralling inwards on a timescale less than a thousandth that of the lifetime of its host star. Therefore either WASP-18 is in a rare, exceptionally short-lived state, or the tidal dissipation in this system (and possibly other hot-Jupiter systems) must be much weaker than in the Solar System.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Nature | ||||
| Publisher: | Nature Publishing Group | ||||
| ISSN: | 0028-0836 | ||||
| Official Date: | 27 August 2009 | ||||
| Dates: |
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| Volume: | Vol.460 | ||||
| Number: | No.7259 | ||||
| Number of Pages: | 3 | ||||
| Page Range: | pp. 1098-1100 | ||||
| DOI: | 10.1038/nature08245 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Description: | Letter |
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| Funder: | UK's Science and Technology Facilities Council |
Data sourced from Thomson Reuters' Web of Knowledge
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