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A '''planetar''' is a planet-like object that are formed in the manner of planets, through accretion or core collapse from a circumstellar disc. Both [[brown dwarf]]s and planetars are planet-like objects above a certain size. Astronomers are divided into two camps over whether to classify these planet-like objects separately depending on their formation process. Such a planet might also be referred to as a ''hypergiant planet''. A completely different form of '''planetar'''
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#REDIRECT [[Brown dwarf#History]]
Hypothetically an ultra-giant planet may result from planetary formation large enough to become a [[red dwarf]]. Perhaps even larger stars may form from discs of gas of [[Population III]] [[protostar]]s.
Therefore, generally a planetar is considered distinct from a brown dwarf in that it is the same size, but forms in the same manner as a planet, as opposed to being a failed star.


==See also==
* [[Sub-brown dwarf]]
* [[Rogue planet|Interstellar planet]]
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* [[Brown dwarf]]
* [[Gas giant|Giant planet]]
* [[Planemo]]
* [[Fusor (astronomy)|Fusor]]

==References==
* arXiv: [http://arxiv.org/abs/astro-ph/0105154%20v2%2014%20May%202001 Infrared Spectroscopy of Substellar Objects in Orion] ''P. W. Lucas, P. F. Roche, France Allard, Peter H. Hauschildt'' Mon, 14 May 2001 09:08:51 GMT (accessed: 25 August 2006)
* Royal Astronomical Society: [http://www.ras.org.uk/index.php?option=com_content&task=view&id=405&Itemid=2 FREE-FLOATING PLANETS CONFIRMED] Thursday, 29 March 2001 (accessed: 25 August 2006)
* [http://search.nature.com/search/?sp-q=Lonely+planets+float+free&sp-x-9=cat&sp-s=date&sp-q-9=NEWS&submit=go&sp-a=sp1001702d&sp-sfvl-field=subject%7Cujournal&sp-t=results&sp-x-1=ujournal&sp-p-1=phrase&sp-p=all news@Nature.com] (subscription required): [http://www.nature.com/news/2001/010404/full/010404-9.html Lonely planets float free] ''Tom Clarke'' 04 Apr 2001 (accessed: 25 August 2006)

==External links==
* [http://www.space.com/scienceastronomy/060605_planemos.html Strange New Worlds Could Make Miniature Solar Systems] Robert Roy Britt (SPACE.com) 5 June 2006 11:35 am ET
* [http://www.dtm.ciw.edu/boss/definition.html Working Group on Extrasolar Planets - Definition of a "Planet"] POSITION STATEMENT ON THE DEFINITION OF A "PLANET" ([[IAU]]) 2003

{{Exoplanet}}

{{DEFAULTSORT:Planetar (Astronomy)}}
[[Category:Brown dwarfs]]
[[Category:Types of planet]]

Revision as of 23:45, 9 September 2015

A planetar is a planet-like object that are formed in the manner of planets, through accretion or core collapse from a circumstellar disc. Both brown dwarfs and planetars are planet-like objects above a certain size. Astronomers are divided into two camps over whether to classify these planet-like objects separately depending on their formation process. Such a planet might also be referred to as a hypergiant planet. A completely different form of planetar Hypothetically an ultra-giant planet may result from planetary formation large enough to become a red dwarf. Perhaps even larger stars may form from discs of gas of Population III protostars. Therefore, generally a planetar is considered distinct from a brown dwarf in that it is the same size, but forms in the same manner as a planet, as opposed to being a failed star.


See also

References

External links

source: https://en.wikipedia.org/w/index.php?title=Planetar_%28astronomy%29&diff=680296801&oldid=650250064

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