An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b
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 h...
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| Veröffentlicht in: | Nature (London) 2009-08, Vol.460 (7259), p.1098-1100 |
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| creator | Hebb, L Pollacco, D. L Wheatley, P. J Parley, N Bentley, S. J Mayor, M Triaud, A. H. M. J Enoch, B Wilson, D. M Queloz, D West, R. G Segransan, D Gillon, M Maxted, P. F. L Pepe, F Cameron, A. Collier Irwin, J Udry, S Hellier, Coel Anderson, D. R Smalley, B Horne, K Lister, T. A |
| description | 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 0.94 days and a mass of ten Jupiter masses (10 MJup), 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. |
| doi_str_mv | 10.1038/nature08245 |
| format | Article |
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L ; Wheatley, P. J ; Parley, N ; Bentley, S. J ; Mayor, M ; Triaud, A. H. M. J ; Enoch, B ; Wilson, D. M ; Queloz, D ; West, R. G ; Segransan, D ; Gillon, M ; Maxted, P. F. L ; Pepe, F ; Cameron, A. Collier ; Irwin, J ; Udry, S ; Hellier, Coel ; Anderson, D. R ; Smalley, B ; Horne, K ; Lister, T. A</creator><creatorcontrib>Hebb, L ; Pollacco, D. L ; Wheatley, P. J ; Parley, N ; Bentley, S. J ; Mayor, M ; Triaud, A. H. M. J ; Enoch, B ; Wilson, D. M ; Queloz, D ; West, R. G ; Segransan, D ; Gillon, M ; Maxted, P. F. L ; Pepe, F ; Cameron, A. Collier ; Irwin, J ; Udry, S ; Hellier, Coel ; Anderson, D. R ; Smalley, B ; Horne, K ; Lister, T. A</creatorcontrib><description>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. 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A</creatorcontrib><title>An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b</title><title>Nature (London)</title><addtitle>Nature</addtitle><addtitle>Nature</addtitle><description>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 0.94 days and a mass of ten Jupiter masses (10 MJup), resulting in a tidal interaction an order of magnitude stronger than that of planet OGLE-TR-56b. 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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 MJup), 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.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>19713926</pmid><doi>10.1038/nature08245</doi><tpages>3</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0028-0836 |
| ispartof | Nature (London), 2009-08, Vol.460 (7259), p.1098-1100 |
| issn | 0028-0836 1476-4687 |
| language | eng |
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| source | Nature; Alma/SFX Local Collection |
| subjects | Astronomy Astrophysics Discovery and exploration Earth, ocean, space Exact sciences and technology Extrasolar planetary systems Humanities and Social Sciences Jupiter Jupiter (Planet) letter multidisciplinary Planets Science Solar system Stars Stars & galaxies Substellar companions planets |
| title | An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-11-29T03%3A53%3A39IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_proqu&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=An%20orbital%20period%20of%200.94%E2%80%89days%20for%20the%20hot-Jupiter%20planet%20WASP-18b&rft.jtitle=Nature%20(London)&rft.au=Hebb,%20L&rft.date=2009-08-27&rft.volume=460&rft.issue=7259&rft.spage=1098&rft.epage=1100&rft.pages=1098-1100&rft.issn=0028-0836&rft.eissn=1476-4687&rft.coden=NATUAS&rft_id=info:doi/10.1038/nature08245&rft_dat=%3Cgale_proqu%3EA207705804%3C/gale_proqu%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=204538735&rft_id=info:pmid/19713926&rft_galeid=A207705804&rfr_iscdi=true |