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{{ Supernova
| name = SN 2011dh
| image=
| caption =
| epoch = [[J2000]]
| SNRtype =
| type = [[II型超新星#IIb型超新星|IIb]]<ref name=atel3413>{{cite web
|date=2011-06-08
|title=ATEL 3413: PTF11eon/SN2011dh is Possibly a Type IIb Event
|publisher=Astronomers Telegram
|url=http://www.astronomerstelegram.org/?read=3413
|accessdate=2011-06-08
|archive-date=2011-07-20
|archive-url=https://web.archive.org/web/20110720115428/http://www.astronomerstelegram.org/?read=3413
|dead-url=no
}}</ref><ref name=atel3428>{{cite web
|date=2011-06-12
|title=Early Optical Spectroscopy of SN 2011dh in M51
|publisher=Astronomers Telegram
|url=http://www.astronomerstelegram.org/?read=3428
|accessdate=2011-06-14
|archive-date=2011-07-20
|archive-url=https://web.archive.org/web/20110720120331/http://www.astronomerstelegram.org/?read=3428
|dead-url=no
}}</ref>
| ra = {{RA|13|30|05.08}}<ref name="AAVSO">{{cite web
|date=2011-06-03
|title=AAVSO Special Notice #241: New Supernova in M51
|publisher=[[美國變星觀測者協會|AAVSO]]
|author=Richard Kinne (kqr)
|url=http://www.aavso.org/aavso-special-notice-241
|accessdate=2011-06-06
|archive-date=2011-06-18
|archive-url=https://web.archive.org/web/20110618155429/http://www.aavso.org/aavso-special-notice-241
|dead-url=no
}}</ref><ref name=atel3398>{{cite web
|date=2011-06-03
|title=ATEL 3398: PTF Discovery of a Type II Supernova in M51
|publisher=Astronomers Telegram
|url=http://www.astronomerstelegram.org/?read=3398
|accessdate=2011-06-06
|archive-date=2011-07-20
|archive-url=https://web.archive.org/web/20110720114919/http://www.astronomerstelegram.org/?read=3398
|dead-url=no
}}</ref>
| dec = {{DEC|+47|10|11.2}}<ref name="AAVSO"/><ref name=atel3398/>
| host = [[渦狀星系]]（M51）
| constellation = [[獵犬座]]
| gal =
| discovery = 2011年5月31日<ref name="Beatty">{{cite web
|date=June 3, 2011
|title=Supernova Erupts in Whirlpool Galaxy
|publisher=[[天空與望遠鏡雜誌|Sky and Telescope]]
|author=Kelly Beatty
|url=http://www.skyandtelescope.com/community/skyblog/observingblog/123110228.html
|accessdate=2011-06-06
|archive-url=https://web.archive.org/web/20110606083646/http://www.skyandtelescope.com/community/skyblog/observingblog/123110228.html
|archive-date=2011-06-06
|dead-url=yes
}}</ref>
| iauc =
| mag_v = 12.1<ref name="supernovae.net">{{cite web
|title=Supernovae 2011dh in M51
|publisher=supernovae.net (International Supernovae Network)
|author=David Bishop
|url=http://www.rochesterastronomy.org/sn2011/sn2011dh.html
|accessdate=2011-06-06
|archive-date=2011-06-09
|archive-url=https://web.archive.org/web/20110609022549/http://www.rochesterastronomy.org/sn2011/sn2011dh.html
|dead-url=no
}}</ref>
| distance =
| progenitor = ?
| progenitor_type = [[黄超巨星]]？<ref name=atel3401/>
| b-v = ?
| notes =
}}
'''SN 2011dh'''是一顆位於[[渦狀星系]]（M51）的[[超新星]]。該超新星是發現於2011年5月31日的[[II型超新星]]，發現時視星等13.5，座標是13:30:05.08 +47:10:11.2<ref name="AAVSO"/>。

==發現==
SN 2011dh是由 Tom Reiland、Thomas Griga、Amédée Riou 和 Stephane Lamotte Bailey 發現，並且由數個單位確認，其中包含了[[帕洛马瞬变工厂]]（Palomar Transient Factory，PTF）<ref name=atel3398/>。它的候選前身星則在[[哈伯太空望遠鏡]]座標13:30:05.119 +47:10:11.55的影像中被拍攝到<ref name=atel3399>{{cite web
|date=2011-06-03
|title=ATEL 3399: POSSIBLE PROGENITOR OF THE NEW TYPE II SN IN M51
|publisher=Astronomers Telegram
|url=http://www.astronomerstelegram.org/?read=3399
|accessdate=2011-06-06
|archive-date=2011-07-20
|archive-url=https://web.archive.org/web/20110720114951/http://www.astronomerstelegram.org/?read=3399
|dead-url=no
}}</ref>。該前身星可能是原始質量18到24倍太陽質量的高光度[[黃超巨星]]<ref name=atel3401>{{cite web
|date=2011-06-03
|title=ATEL 3401: Properties of the Candidate Progenitor of SN 2011dh in M51
|publisher=Astronomers Telegram
|url=http://www.astronomerstelegram.org/?read=3401
|accessdate=2011-06-06
|archive-date=2011-07-20
|archive-url=https://web.archive.org/web/20110720114932/http://www.astronomerstelegram.org/?read=3401
|dead-url=no
}}</ref>。該超新星於同年6月19日達到最高亮度12.1等<ref name="supernovae.net"/>。

來自[[凱克天文台]]的[[發射光譜]]以及帕洛马瞬变工厂的資料指出這顆[[II型超新星]]的光譜是帶有[[天津增九|天鵝座P]]型星[[巴耳末系]]光譜的相對偏藍連續譜<ref name="AAVSO"/>。這是一個不尋常的事件，因為在星系內的超新星光譜通常幾乎都是完全連續的。當時預期該超新星在北半球可觀測連續數個月<ref name="AAVSO"/>。

SN 2011dh是17年內在渦狀星系內繼[[SN 1994I]]和[[SN 2005cs]]之後觀測到的第三顆超新星，對於單一星系而言，可說發現了相當多的超新星<ref>{{Cite web |url=http://apod.nasa.gov/apod/ap110605.html |title=Astronomy Picture of the Day for June 5th |accessdate=2012-10-03 |archive-date=2012-10-07 |archive-url=https://web.archive.org/web/20121007164526/http://apod.nasa.gov/apod/ap110605.html |dead-url=no }}</ref>。一般預測在一個星系內大約每四十年會有一顆超新星<ref name=apjss92_2>{{cite journal | author=Tammann, G. A.; Loeffler, W.; Schroeder, A. | title=The Galactic supernova rate | journal=The Astrophysical Journal Supplement Series | volume=92 | issue=2 | pages=487–493 | bibcode=1994ApJS...92..487T | doi=10.1086/192002 |date=June 1994}}</ref>。

==觀測==
因為有許多業餘觀測者的觀測活動，這顆超新星SN 2011dh很難被忽略。2011年6月25日起它的星等保持在12.7一段時間。雖然它的光度是肉眼可見下限6.5等星的三百分之一<ref>数学表达式：[[视星等#计算|2.512]]<sup>(12.7 − 6.5)</sup> = 302</ref>，它在黑暗的夜空中仍是搭載了新式[[電荷耦合元件|CCD]]的業餘望遠鏡容易觀測的目標。

== 參考資料 ==
{{Reflist}}

== 外部連結 ==
* [http://www.backyardastronomer.com/SN/m51_sn_2011_1.gif GIF animation of pre and post images of SN 2011dh]{{Wayback|url=http://www.backyardastronomer.com/SN/m51_sn_2011_1.gif |date=20120325005654 }}
* [http://asterisk.apod.com/viewtopic.php?f=29&t=23856 Views of the developing supernova]{{Wayback|url=http://asterisk.apod.com/viewtopic.php?f=29&t=23856 |date=20110608031912 }}
* [http://astro.berkeley.edu/~weidong/m51sn.prog.gif SN 2011dh progenitor?]{{Webarchive|url=https://archive.today/20121212020050/http://astro.berkeley.edu/~weidong/m51sn.prog.gif |date=2012-12-12 }}
* [https://web.archive.org/web/20111007095421/http://www.digitalsky.org.uk/DSO/2011-06-02_M51L300002.jpg Magnitude comparison 2011-06-02]
* [http://news.discovery.com/space/twitter-helps-astronomers-zero-in-on-m51-supernova-110606.html Twitter Helps Astronomers Zero-In on M51 Supernova]{{Wayback|url=http://news.discovery.com/space/twitter-helps-astronomers-zero-in-on-m51-supernova-110606.html |date=20120930101744 }} (Jun 6, 2011 Ian O'Neill)
* [https://archive.today/20130221223923/http://lcogt.net/en/observations/ogg/2m0a/58956 M51 (Whirlpool Galaxy)] at Las Cumbres Observatory on 6 Jun 2011
* [http://astroblogger.blogspot.com/2011/06/supernova-sn2011dh-in-m51-is.html Supernova sn2011dh in M51 is brightening!]{{Wayback|url=http://astroblogger.blogspot.com/2011/06/supernova-sn2011dh-in-m51-is.html |date=20110625121326 }} (June 14, 2011 Ian Musgrave)
* [http://arxiv.org/abs/1106.3551 PTF11eon/SN2011dh: Discovery of a Type IIb Supernova From a Compact Progenitor in the Nearby Galaxy M51]{{Wayback|url=http://arxiv.org/abs/1106.3551 |date=20190217203522 }} (arXiv:1106.3551 : 17 Jun 2011)
* [http://arxiv.org/abs/1107.1876 Panchromatic Observations of SN 2011dh Point to a Compact Progenitor Star]{{Wayback|url=http://arxiv.org/abs/1107.1876 |date=20190217203522 }} (arXiv:1107.1876 : 10 Jul 2011)

{{2011年太空活動}}

{{DEFAULTSORT:Sn 2011dh}}
[[Category:2011年发现的超新星]]
[[Category:獵犬座]]

SN 2011dh - 版本历史

imported>InternetArchiveBot：​Reformat 2 URLs (Wayback Medic 2.5)) #IABot (v2.0.9.5) (GreenC bot

imported>InternetArchiveBot：Reformat 2 URLs (Wayback Medic 2.5)) #IABot (v2.0.9.5) (GreenC bot