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Astronomy and Cosmology
Astronomy and Astrophysics
Brown Dwarf Mass Gain: Does Radius Increase?
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[QUOTE="Chronos, post: 6046323, member: 10970"] Adding mass to a degenerate body would cause it to shrink only so far as nothing else changes. For a brown dwarf, that something else would be hydrogen fusion. Once that occurs, the shrinkage would cease and it would expand due to the heat. A brown dwarf can remain degenerate, but initiate tritum fusion,at around 60 Jupiter masses [Mj]. At a mass around 13 Mj deuterium fusion is believed possible. Brown dwarfs in the 60-90 Mj] qualify as L spectral class, hot enough to initiate hydrogen fusion, but enough to trigger lithium fusion. Brown dwarfs in the 13-60 Mj range are capable of deuterium fusion, but, not hydrogen or even lithium fusion. They are considered spectral class T or Y, depending upon temperature. Once the temperature falls below about 1000K it is no longer considered a brown dwarf, just an ordinary planet. [/QUOTE]
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Brown Dwarf Mass Gain: Does Radius Increase?
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