An orbital period of 0.94days for the hot-Jupiter planet WASP-18b

Details An orbital period of 0.94days for the hot-Jupiter planet WASP-18b An orbital period of 0.94days for the hot-Jupiter planet WASP-18b

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009natur.460.1098h&link_type=abstract

Nature, Volume 460, Issue 7259, pp. 1098-1100 (2009).

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Scientific paper

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, or by an alternative mechanism such as planet-planet scattering. The hot Jupiters closest to their parent stars, at orbital distances of only ~0.02 astronomical units, have strong tidal interactions, and systems such as OGLE-TR-56 have been suggested as tests of tidal dissipation theory. Here we report the discovery of planet WASP-18b with an orbital period of 0.94days and a mass of ten Jupiter masses (10MJup), 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 106, 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.

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