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| url=http://var2.astro.cz/ETD/etd.php?STARNAME=WASP-18&PLANET=b |
| url=http://var2.astro.cz/ETD/etd.php?STARNAME=WASP-18&PLANET=b |
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| accessdate=2009-08-29 |
| accessdate=2009-08-29 |
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}}</ref> |
}}</ref> |
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| RA = {{RA|01|37|25.0335}}<ref name="Gaia DR2"/> |
| RA = {{RA|01|37|25.0335}}<ref name="Gaia DR2"/> |
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| dist_pc = {{val|123.9|0.4}}<ref name="Gaia DR2"/> |
| dist_pc = {{val|123.9|0.4}}<ref name="Gaia DR2"/> |
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| class = F6<ref name="EPE" /> |
| class = F6<ref name="EPE" /> |
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| mass = 1.25<ref>{{Cite web |url=http://exep.jpl.nasa.gov/atlas/atlas_profile.cfm?Star=474 |title=PlanetQuest: WASP-18 b |access-date=2018-07-19 |
| mass = 1.25<ref>{{Cite web |url=http://exep.jpl.nasa.gov/atlas/atlas_profile.cfm?Star=474 |title=PlanetQuest: WASP-18 b |access-date=2018-07-19 }}</ref> |
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}} |
}} |
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{{Planetbox orbit |
{{Planetbox orbit |
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| semimajor = 0.02026 ± 0.00068<ref name="EPE">{{cite web |url=http://exoplanet.eu/planet.php?p1=WASP-18&p2=b |title=Notes for planet WASP-18b |work=The Extrasolar Planets Encyclopaedia |accessdate=2009-09-15 |
| semimajor = 0.02026 ± 0.00068<ref name="EPE">{{cite web |url=http://exoplanet.eu/planet.php?p1=WASP-18&p2=b |title=Notes for planet WASP-18b |work=The Extrasolar Planets Encyclopaedia |accessdate=2009-09-15 }}</ref> |
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| periastron = 0.02007 |
| periastron = 0.02007 |
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| apastron = 0.02045 |
| apastron = 0.02045 |
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| discovery_method = 凌日法<ref name="Hellier2009" />(包含次食) |
| discovery_method = 凌日法<ref name="Hellier2009" />(包含次食) |
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| detection_methods = 徑向速度法 |
| detection_methods = 徑向速度法 |
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| discovery_status = 已發表 |
| discovery_status = 已發表论文<ref name="Hellier2009" /> |
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}} |
}} |
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{{Planetbox catalog |
{{Planetbox catalog |
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{{Planetbox end}} |
{{Planetbox end}} |
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'''WASP-18b'''是一颗以公转周期很短,小于1个地球日而聞名的[[太陽系外行星]],其質量大約為10倍[[木星質量]]<ref name="Hellier2009" />,刚好低于[[行星]]和[[棕矮星]]的13倍木星質量分界线。因為[[潮汐加速#潮汐減速|潮汐減速]],一般 |
'''WASP-18b'''是一颗以公转周期很短,小于1个地球日而聞名的[[太陽系外行星]],其質量大約為10倍[[木星質量]]<ref name="Hellier2009" />,刚好低于[[行星]]和[[棕矮星]]的13倍木星質量分界线。因為[[潮汐加速#潮汐減速|潮汐減速]],一般认为該恆星在之後一百萬年內會以螺線軌跡逐漸接近母恆星,最終被母恆星[[WASP-18]]吞噬<ref name="Hellier2009" />。WASP-18b距離母恆星約310萬公里,距離地球約410光年。該行星由英格兰[[基爾大学 (英国)|基爾大学]]的天文学家科埃·赫利尔(Coel Hellier)為首的團隊发现<ref name="Hellier2009" />。 |
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== 概要 == |
== 概要 == |
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基爾大 |
基爾大学和美国[[马里兰大学帕克分校|馬里蘭大学學院市分校]]的天文学家正在努力了解這顆行星是否在預期被摧毀时间前不久(低於其預期壽命0.1%)偶然被发现;或者WASP-18b的潮汐消散其實比天文学家預期的低得多<ref name="Hellier2009" /><ref name="Hamilton">{{cite journal |
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| last = Hamilton |
| last = Hamilton |
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| first = Douglas P. |
| first = Douglas P. |
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| title = Extrasolar planets: Secrets that only tides will tell |
| title = Extrasolar planets: Secrets that only tides will tell |
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| journal = [[自然 |
| journal = [[自然(期刊)|Nature]] |
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| volume = 460 |
| volume = 460 |
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| issue = 7259 |
| issue = 7259 |
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| pages = 1086–1087 |
| pages = 1086–1087 |
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| publisher = [[ |
| publisher = [[Nature Portfolio|Nature Publishing Group]] |
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| date = 2009-08-27 |
| date = 2009-08-27 |
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| url = http://www.nature.com/nature/journal/v460/n7259/full/4601086a.html |
| url = http://www.nature.com/nature/journal/v460/n7259/full/4601086a.html |
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| pmid = 19713920 |
| pmid = 19713920 |
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| bibcode = 2009Natur.460.1086H |
| bibcode = 2009Natur.460.1086H |
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| last = Thompson |
| last = Thompson |
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| first = Andrea |
| first = Andrea |
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| doi = |
| doi = |
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| accessdate = 2009-08-28 |
| accessdate = 2009-08-28 |
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}}</ref>。 |
}}</ref>。 |
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[[太陽系]]中 |
[[太阳系|太陽系]]中与WASP-18b狀況最類似的例子是[[火星]]的衛星[[火卫一]]。火卫一的軌道半徑只有約9000公里,相當於地球和月球距離的四十分之一<ref>Johnson, John Jr.; [http://www.latimes.com/news/nationworld/nation/la-sci-planet27-2009aug27,0,5882308.story Astrophysicists puzzle over planet that's too close to its sun] , ''Los Angeles Times'' (August 27, 2009).</ref>,天文学家預期火衛一大約在1100萬年後被潮汐力摧毀<ref>{{cite arXiv |
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| last = Sharma | first = Bijay Kumar |
| last = Sharma | first = Bijay Kumar |
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| title = Theoretical Formulation of the Phobos, moon of Mars, rate of altitudinal loss |
| title = Theoretical Formulation of the Phobos, moon of Mars, rate of altitudinal loss |
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}}</ref>。 |
}}</ref>。 |
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[[File:PIA22087-Exoplanet-Wasp18b-COinStratosphere-20171129.jpg|thumb|center|300px|<center>天文 |
[[File:PIA22087-Exoplanet-Wasp18b-COinStratosphere-20171129.jpg|thumb|center|300px|<center>天文学家在WASP-18b的[[平流層]]中发现大量[[一氧化碳]]示意圖<ref name="NASA-20171129a">{{cite web |last1=Landau |first1=Elizabeth |last2=Zubritsky |first2=Elizabeth |title=Exoplanet Has Smothering Stratosphere Without Water |url=https://www.jpl.nasa.gov/news/news.php?feature=7012 |date=29 November 2017 |work=[[美国国家航空航天局|NASA]] |accessdate=29 November 2017 }}</ref>。 |
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</center>]] |
</center>]] |
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[[Category:2009年发现的系外行星]] |
[[Category:2009年发现的系外行星]] |
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[[Category:热木星]] |
[[Category:热木星]] |
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[[Category:凤凰座]] |
[[Category:凤凰座]] |
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[[Category:凌星现象]] |
[[Category:凌星现象]] |