Piling on the neutrons

To comment upon the actual astronomy at Keck: the higher limit for neutron stars means the stars can, actually, survive as neutron stars - maybe with a few quarks. But they cannot be Quark Soup much less the other exotica.

I don't know if we'll find anything heavier than that, on Hawaii or elsewhere. But, yeah, the heavier the stellar mass gets as a visibly neutronic mass, the fewer quarks are allowed.

I am also unsure what happens if/when some mass limit is breached. Blackhole, sure. But how? does the core collapse into that quark-soup thus raising the eventhorizon? or does the horizon simply appear inside or even outside the radius? If inside, I think we'd be seeing the outer shell of the star simply spin around as relativistic free neutrons, for some centuries as seen from outside. Like a beryllium-11 halo.

Even if interior I suspect that the conversion of a neutron star into a black hole is not as violent as, say, a Type I super-nova nor a Type II gas giant's implosion. Hence why we've not seen any, in the electromagnetic spectrum or in the gravity ripples.

LOW MASS 10/24 This might be a quark star.