Planet Foramtion without stars

  • Thread starter TShock
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  • #1
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Main Question or Discussion Point

has anyone ever done research on the accretion of planets into a system without a star forming? Just a dark system. How likely is this to happen as opposed to a system forming with a star?
 

Answers and Replies

  • #2
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..what would the planets orbit?
 
  • #3
Borek
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Central body can be massive, but it can be not massive enough to become a star. Like a brown dwarf (check wikipedia article). See also wiki entry on Cha 110913-773444.
 
  • #4
Chronos
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As Borek noted, planet formation does not require a star. An oversized 'Jupiter' would be sufficient. I expect any such planets would, however, be small.
 
  • #5
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"David Bennett of the University of Notre Dame has discovered an extra-solar planet of about three Earth masses orbiting a star with a mass so low that its core may not be large enough to maintain nuclear reactions"

I noticed this on Science Daily this morning.

http://www.sciencedaily.com/releases/2008/06/080602131105.htm
 
  • #6
970
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Wikipedia said:
A rogue planet is an object which has equivalent mass to a planet and is not gravitationally bound to any star, and that therefore moves through space as an independent object.

Sub-brown dwarf is a planetary-mass object whose mass is smaller than the low-mass cut-off for brown dwarfs (around 13 times the mass of Jupiter). Unlike proper brown dwarfs, they are not massive enough to fuse deuterium. Sub-brown dwarfs are formed in the manner of stars, through the collapse of a gas cloud, and not through accretion or core collapse from a circumstellar disc.
Reference:
http://en.wikipedia.org/wiki/Interstellar_planet" [Broken]
http://en.wikipedia.org/wiki/Sub-brown_dwarf" [Broken]
 
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