13 votes

Properties of low-mass stellar remnants vs the Earth

Stellar remnants are completely different from planets. The Earth was never a star and fusion has never occurred in the Earth's core at any time in its history. When a small to medium sized star dies,...
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6 votes
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Does a kilonova leave a high mass remnant?

I think it is generally expected that the merger of two neutron stars will lead to the formation of a black hole. What is more uncertain is whether that black hole forms straight away, or an ...
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6 votes
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What's the big deal with WD 1856+534 b?

I'll address the three sub-questions individually, as a way of fully answering the title question. While there are indeed three planets orbiting PSR B1257+12, note that it's a pulsar, the compact ...
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4 votes
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Properties of low-mass stellar remnants vs the Earth

By stellar remnant, it sounds like you mean a white dwarf. These each have a composition that is determined by their history and how far into nuclear burning they've gone. Often they have lots of ...
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4 votes
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Do mixed type remnant collisions produce anything interesting?

WD+NS collision cannot leave nothing behind. Gravitational mass defect of NS is ~10% of its rest mass -- thus whatever energy released in the collision cannot disrupt the NS. The energy released is ...
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4 votes
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What actually is the mass?

This answer addresses first the initial misconception that the mass of black hole is greater than the mass of its parent star. This is not true. The gravity may be more intense, but the mass is less. ...
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4 votes
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Is there a way to calculate the mass of of a stellar remnant given the initial mass of the star?

For massive stars and their remnants, one can only be guided by theoretical measurements at present, since we do not have any masses for isolated neutron stars and black holes and no measurements of ...
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3 votes
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What percent of all stars that have lived (up to now) are stellar remnants?

Most of the remnants are white dwarfs, because their progenitors can be much shorter lived than the lifetime of the galaxy and are much more numerous than the higher mass progenitors of neutron stars ...
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2 votes
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Does the mass of a collapsing star change?

This is an old question, but I'd like to answer it anyway. Does a star, when collapsing into a neutron star, or even a black hole, pick up any significant relativistic mass due to its rapid ...
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2 votes

What kind of radiation do supernova remnants emit?

Young supernova remnant release a substantial amount of radiation as they expand into the interstellar medium. In the free expansion phase, the outgoing shock wave heats up matter to $\sim10^6$ Kelvin,...
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1 vote

Is there a way to calculate the mass of of a stellar remnant given the initial mass of the star?

When the initial conditions, like mass, chemical composition, and rotation are the same, for the vast majority of stars there are no intrinsic variations in their development. Of course, statistical ...
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1 vote

What kind of radiation do supernova remnants emit?

I assume you are talking about neutron stars. Some supernovae leave nothing except a black hole, and these dense remnant objects are typically surrounded by a lot of more scattered material that was ...
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1 vote

Does the mass of a collapsing star change?

The bulk motion of the gas would contribute to the relativistic mass-energy of the compact object. White dwarfs are not produced by collapse, so there is nothing to comment on here. Neutron stars ...
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