After reading this question, I decided to post a question about degeneracy. I've seen simulations on large, $15\text{+ }M_J$ objects that are accreting mass. They do not grow in radius, instead they shrink (that is something I know about degenerate objects). But why do they get hotter? I'm assuming it comes from the internal pressure, and at what mass does some sort of fusion occurs?
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1$\begingroup$ I have found this paper where they investigate the Finite-temperature Extension for Cold Neutron Star taking degenerate matter into account. This could help you to answer how pressure and temperature work iniside a degenerate object. $\endgroup$– WilhelmroentgenMar 4, 2021 at 19:13
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