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{{Planetbox begin
| name = WASP-39b
}}
{{Planetbox image
| image = Wasp-39b and its parent star (artist’s impression).jpg
| caption = 天文學家在系外行星WASP-39b的大氣層中發現大量的水（想像圖）<ref name="NASA-20180301" />
}}
{{Planetbox star
| star = WASP-39<ref name="EXO-20180301" />
| constell = [[室女座]]<ref name="NASA-20180301" />
| RA = {{RA|14|29|18.0}}<ref name="EXO-20180301" />
| DEC = {{DEC|-03|26|40}}<ref name="EXO-20180301" />
| app_mag = 12.11<ref name="EXO-20180301" />
| dist_ly = 700<ref name="NASA-20180301" />
| dist_pc = 230<ref name="EXO-20180301" />
| class = G8<ref name="EXO-20180301" />
| mass = {{val|0.93|0.0}}<ref name="EXO-20180301" />
}}
{{Planetbox orbit
| semimajor = {{val|0.0486|0.0005}}<ref name="EXO-20180301" />
| period = {{val|4.05526|}}<ref name="EXO-20180301" />
| period_hour =
| eccentricity = 0<ref name="EXO-20180301" />
| inclination = {{val|87.83|0.25}}<ref name="EXO-20180301" />
| t_transit =
}}
{{Planetbox character
| mass = {{val|0.28|0.03}}<ref name="EXO-20180301" />
| radius = {{val|1.27|0.04}}<ref name="EXO-20180301" />
| density = {{val|180|40}}
| temperature =
| bond_albedo =
| geometric_albedo =
}}
{{Planetbox discovery
| discovery_date = 2011<ref name="EXO-20180301" />
| discoverers =
| discovery_site = [[超廣角尋找行星|WASP]]<ref name="EXO-20180301" />
| discovery_method = 凌日法<ref name="EXO-20180301" />
| detection_methods =
| discovery_status = 已確認<ref name="EXO-20180301" />
}}
{{Planetbox reference
| star = WASP-39
| planet = b
}}
{{Planetbox end}}

'''WASP-39b'''是一顆[[熱木星|熱土星]]型[[太陽系外行星]]，於2011年由[[超廣角尋找行星]]計劃發現。該行星因為在大氣層內發現大量水而聞名<ref name="NASA-20180301" /><ref name="AJ-20171221" /><ref name="PHYS-20180301" /><ref name="DM-20180301" />。WASP-39b在天球上位於[[室女座]]，距離地球約700光年<ref name="NASA-20180301" />。

== 行星性質 ==
[[File:Clear to cloudy hot Jupiters.jpg|thumb|left|400px|
<center>多顆熱木星行系外行星比較。WASP-39b為上列左起第四顆（想像圖）</center>
從左上至右下的行星分別為：[[WASP-12b]]、{{link-en|WASP-6b|WASP-6b}}、{{link-en|WASP-31b|WASP-31b}}、WASP-39b、[[HD 189733 b]]、[[HAT-P-12b]]、[[WASP-17b]]、[[WASP-19b]]、[[HAT-P-1b]]和[[HD 209458b]].]]
WASP-39b的質量為木星的0.28倍，但半徑為木星的1.27倍<ref name="EXO-20180301" />。該行星環繞母恆星[[WASP-39]]的軌道週期為4日<ref name="NASA-20180301" />。天文學家於2018年宣布在WASP-39b的大氣層內發現高溫水分子<ref name="NASA-20180301" />。

WASP-39b也因為其極低的密度而聞名，其密度僅高於已知最低的行星[[WASP-17b]]。WASP-17b的密度為{{val|0.13|0.06}} g/cm<sup>3</sup>，而WASP-39b則是稍高的{{val|0.18|0.04}} g/cm<sup>3</sup>。
{{clear|left}}

== 參見 ==
* [[WASP-6b]]
* [[WASP-17b]]
* [[WASP-19b]]
* {{link-en|WASP-31b|WASP-31b}}
* [[WASP-121b]]

== 參考資料 ==
{{reflist|refs=

<ref name="NASA-20180301">{{cite web |last1=Cofield |first1=Calla |last2=Jenkins |first2=Ann |last3=Villard |first3=Ray |title=NASA Finds a Large Amount of Water in an Exoplanet's Atmosphere |url=https://www.jpl.nasa.gov/news/news.php?feature=7072 |date=1 March 2018 |work=[[NASA]] |accessdate=3 March 2018 |archive-date=2020-11-09 |archive-url=https://web.archive.org/web/20201109034305/https://www.jpl.nasa.gov/news/news.php?feature=7072 |dead-url=no }}</ref>

<ref name="EXO-20180301">{{cite web |title=Planet WASP-39 b |url=http://exoplanet.eu/catalog/wasp-39_b/ |date=2018 |work=[[太陽系外行星百科|Extrasolar Planets Encyclopaedia]] |accessdate=1 March 2018 |archive-date=2022-11-28 |archive-url=https://web.archive.org/web/20221128054819/http://exoplanet.eu/catalog/wasp-39_b/ |dead-url=no }}</ref>

<ref name="PHYS-20180301">{{cite web |title=NASA finds a large amount of water in an exoplanet's atmosphere |url=https://phys.org/news/2018-03-nasa-large-amount-exoplanet-atmosphere.html |date=1 March 2018 |work=[[Phys.org]] |accessdate=1 March 2018 |archive-date=2022-09-02 |archive-url=https://web.archive.org/web/20220902103459/https://phys.org/news/2018-03-nasa-large-amount-exoplanet-atmosphere.html |dead-url=no }}</ref>

<ref name="DM-20180301">{{cite news |last=MacDonald |first=Cheyenne |title=Saturn-sized exoplanet 700 light-years away has WATER in its atmosphere, NASA reveals |url=http://www.dailymail.co.uk/sciencetech/article-5452031/Exoplanet-700-light-years-away-WATER-atmosphere.html |date=1 March 2018 |work=[[Daily Mail]] |accessdate=1 March 2018 |archive-date=2022-06-27 |archive-url=https://web.archive.org/web/20220627192920/https://www.dailymail.co.uk/sciencetech/article-5452031/Exoplanet-700-light-years-away-WATER-atmosphere.html |dead-url=no }}</ref>

<ref name="AJ-20171221">{{cite journal |author=H. R. Wakeford, D. K. Sing, D. Deming, <abbr title="N. K. Lewis, J. Goyal, T. J. Wilson, J. Barstow, T. Kataria, B. Drummond, T. M. Evans, A. L. Carter, N. Nikolov, H. A. Knutson, G. E. Ballester, and A. M. Mandell.">et al</abbr> |title=The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint |url=http://iopscience.iop.org/article/10.3847/1538-3881/aa9e4e/meta |date=21 December 2017 |journal=[[天文期刊|The Astronomical Journal]] |volume=155 |number=1 |accessdate=1 March 2018 |archive-date=2019-05-31 |archive-url=https://web.archive.org/web/20190531043554/https://iopscience.iop.org/article/10.3847/1538-3881/aa9e4e/meta |dead-url=no }}</ref>

}}

== 外部連結 ==
{{commonscat-inline|WASP-39 b|WASP-39b}}

{{2011年太空活動}}
{{portal bar|天文学|太空}}
{{Sky|14|29|18.0|-|03|26|40}}

[[Category:凌星现象]]
[[Category:2011年发现的系外行星]]
[[Category:热木星]]
[[Category:室女座]]

WASP-39b - 版本历史

imported>CommonsDelinker：​Bot：以Wasp-39b_and_its_parent_star_(artist’s_impression).jpg代替Exoplanet-WASP-39b-20180301.jpg（CommonsDelinker的要求：Duplicate: Exact or scaled-down duplicat

imported>CommonsDelinker：Bot：以Wasp-39b_and_its_parent_star_(artist’s_impression).jpg代替Exoplanet-WASP-39b-20180301.jpg（CommonsDelinker的要求：Duplicate: Exact or scaled-down duplicat