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A comment on Astronomers uncover largest group of rogue planets yet. Parent comment

Re:Astronomers uncover largest group of rogue planets yet by TheOtherHobbes on Saturday January 01, 2022 @04:59PM (#29763286)
Brown dwarf? Some sputtering early attempts at fusion, but not enough to become self-sustaining.

13 Mj is on the low side of the definition. It's not a definitive number and goes as high as 80 Mj, depending who you ask.

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Re:Astronomers uncover largest group of rogue planets yet by wumpus on Saturday January 01, 2022 @06:57PM (#29764197)
13 Mj is the current mass at which people think deuterium fusion can start. Above 80 Mj, hydrogen fusion will start.

These numbers depend on a lot of details of stellar atmospheres.

I took a graduate-level Stellar Atmospheres class from S. Kumar, who first theorized about this class of not-quite-star.

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