WASP-18b:修订间差异

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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
| accessdate=2009-08-29
| accessdate=2009-08-29
|
|
|
}}</ref>
}}</ref>
| 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"/>
| class = F6<ref name="EPE" />
| class = F6<ref name="EPE" />
| 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>
| 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>
}}
}}
{{Planetbox orbit
{{Planetbox orbit
| 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>
| 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>
| periastron = 0.02007
| periastron = 0.02007
| 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)
| detection_methods = 徑向速度法
| detection_methods = 徑向速度法
| discovery_status = 已發表文<ref name="Hellier2009" />
| discovery_status = 已發表文<ref name="Hellier2009" />
}}
}}
{{Planetbox catalog
{{Planetbox catalog
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{{Planetbox end}}
{{Planetbox end}}


'''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]],一般認為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[[基爾大 (英国)|基爾大]]的天文家科埃·赫利尔(Coel Hellier)為首的團隊發現<ref name="Hellier2009" />。
'''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[[基爾大 (英国)|基爾大]]的天文家科埃·赫利尔(Coel Hellier)為首的團隊发现<ref name="Hellier2009" />。


== 概要 ==
== 概要 ==
基爾大和美[[馬里蘭大學院市分校]]的天文家正在努力了解這顆行星是否在預期被摧毀時間前不久(低於其預期壽命0.1%)偶然被發現;或者WASP-18b的潮汐消散其實比天文家預期的低得多<ref name="Hellier2009" /><ref name="Hamilton">{{cite journal
基爾大和美[[马里兰大学帕克分校|馬里蘭大學院市分校]]的天文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家預期的低得多<ref name="Hellier2009" /><ref name="Hamilton">{{cite journal
| last = Hamilton
| last = Hamilton
| first = Douglas P.
| first = Douglas P.
| title = Extrasolar planets: Secrets that only tides will tell
| title = Extrasolar planets: Secrets that only tides will tell
| journal = [[自然 (期刊)|Nature]]
| journal = [[自然期刊|Nature]]
| volume = 460
| volume = 460
| issue = 7259
| issue = 7259
| pages = 1086–1087
| pages = 1086–1087
| publisher = [[自然出版集团|Nature Publishing Group]]
| publisher = [[Nature Portfolio|Nature Publishing Group]]
| date = 2009-08-27
| date = 2009-08-27
| 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
| bibcode = 2009Natur.460.1086H
| bibcode = 2009Natur.460.1086H
}}</ref>。接下來十年內對WASP-18b的觀測可以讓天文家計算其軌道衰減率<ref name="Thompson">{{cite web
|
|
}}</ref>。接下來十年內對WASP-18b的觀測可以讓天文家計算其軌道衰減率<ref name="Thompson">{{cite web
| last = Thompson
| last = Thompson
| first = Andrea
| first = Andrea
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| doi =
| doi =
| accessdate = 2009-08-28
| accessdate = 2009-08-28
|
|
}}</ref>。
}}</ref>。


[[太陽系]]中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>,天文家預期火衛一大約在1100萬年後被潮汐力摧毀<ref>{{cite arXiv
[[太阳系|太陽系]]中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>,天文家預期火衛一大約在1100萬年後被潮汐力摧毀<ref>{{cite arXiv
| last = Sharma | first = Bijay Kumar
| last = Sharma | first = Bijay Kumar
| 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>。


[[File:PIA22087-Exoplanet-Wasp18b-COinStratosphere-20171129.jpg|thumb|center|300px|<center>天文家在WASP-18b的[[平流層]]中發現大量[[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=[[NASA]] |accessdate=29 November 2017 ||}}</ref>。
[[File:PIA22087-Exoplanet-Wasp18b-COinStratosphere-20171129.jpg|thumb|center|300px|<center>天文家在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>。
</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]]
[[Category:热木星]]
[[Category:热木星]]
[[Category:凤凰座]]
[[Category:凤凰座]]
[[Category:凌星现象]]
[[Category:凌星现象]]