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Questions tagged [neutron-star]

Questions regarding a degenerate star that is mainly composed of neutrons.

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There is a decibel limit to sound based on the medium, what is the decibel limit in neutronium?

I've been participating in many discussions online about the classic thought experiment on pressing a button a light year away with a light year long rod. The solution boils down to the speed of ...
Aaron Hathaway's user avatar
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Is there a mass-vs-radius chart for neutron stars?

I'm aware that we currently don't have an equation of state for the radius of a neutron star, because we don't know what happens to neutrons at their cores, and because the equations involved with ...
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How is angular momentum transferred between a neutron star and its accretion disk?

Accreting neutron stars can either gain or loose angular momentum via interaction with their accretion disks. This leads to either spin-up or spin-down. Which of the two is the case, depends on the ...
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Neutron star r-process nucleosynthesis

The $r$-process in supernovae happens when a high flux of neutrons irradiates the heaviest abundant nuclei (in the region of iron), resulting in endothermic nuclear reactions. To the extent that at ...
Martin Kochanski's user avatar
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Why do double neutron stars remain bounded?

I read that in principle, the formation of a double neutron star requires that at the time of the second supernova explosion the binary consists of a $\sim$ 1.4 solar mass neutron star, and a second ...
some_math_guy's user avatar
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What's the mass distribution of elements created in neutron star mergers?

In charts like this, you'll see that a bunch of the heaviest elements mostly come from neutron star mergers. But what about the mass distribution of just the products of neutron star mergers? That is, ...
zucculent's user avatar
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Can we use asteroseismology to study neutron stars?

Asteroseismology study the propagation of sound waves inside a star to probe its internal structure. Could something similar be used to study the structure of neutron stars and put constraints on the ...
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Can mass loss via accretion occur on stellar remnants?

We know that normal stars can lose mass to a binary companion. But can this happen to neutron stars and white dwarfs? Let's say a stellar black hole is being orbited by a white dwarf or neutron star. ...
slowerthanstopped's user avatar
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How could we search for old cold neutron stars?

This is the inverse of Will Gaia detect inactive neutron stars? (to which the answer was "probably not"). So if Gaia can't do it, what would it take? How could such a search work, and what ...
Steve Linton's user avatar
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What is the "radiation sound speed" inside an accretion column?

I was trying to read "A New Two-fluid Radiation-hydrodynamical Model for X-Ray Pulsar Accretion Columns" and its follow-up paper both by West et al. and came across a quantity called "radiation sound ...
SpaceCore's user avatar
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What does "GPU-accelerated butterfly matched filtering over dense bank of time-symmetric chirp-like templates" mean? (GW170817)

A new analysis of gravitational wave (and other data) from GW170817 on 2017-Aug-17 has been published, strongly suggesting that the merger of two neutron stars resulted in a large, rapidly rotating ...
uhoh's user avatar
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In what year (2014?) the gravitational wave triggered by this merger was possibly generated?

Re: "A transient radio source consistent with a merger-triggered core collapse supernova" https://www.science.org/doi/10.1126/science.abg6037 Actually the described merger consisted of two ...
Alex's user avatar
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What would happen if a neutron star merged with a white dwarf?

We've heard of neutron star mergers and white dwarf mergers. But what would result in a neutron star merging with a white dwarf? Would there be a similar super/kilonova, are there any examples of it, ...
slowerthanstopped's user avatar
2 votes
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What is the gravitational wave spectrum of an ellipsoid neutron star like?

If the star is ellipsoid instead a sphere, the wave should be rich of harmonics, not only (2*orbital frequency). Can these harmonics behave the same way, i.e. they appear/disappear together and drift (...
Chen's user avatar
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What methodology should be used to choose the correct model for origin of QPOs in X-ray astronomy?

In X-ray astronomy, quasi periodic oscillations (QPOs) are routinely shown by black hole and neutron star X-ray binary systems in their X-ray flux. Despite being strong and easily measurable signals, ...
Richard's user avatar
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Is there any synthetic spectrum software for neutron star?

Is there any software that can calculate the emergent spectrum of a neutron star photosphere, for Teff is about 1e7K, density is above 1e21-1e22 cm^-3 ? Output line wavelength is about 0-100A is ...
Chen's user avatar
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A high-temperature isolated neutron star could be super-Eddington?

If the surface temperature of a young neutron star is hot enough, say, several KeV, its blackbody radiation could be super-Eddington? Did any paper discuss this scenario before?
questionhang's user avatar
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Number of neutron stars by radiation band

Since the number of known neutron stars ain't reached yet 4000 at the time of writing, I am wondering about how neutron stars are classified in terms of their radiation spectrum. Clearly, some neutron ...
Jimmy Bionic's user avatar
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Is it coincidence that the change in GPE when falling from deep space into the largest know neutron star is approximately mc squared Joules?

We can calculate the change in GPE in falling from a very long distance to the surface of a star or planet from $$\Delta{GPE} = \int_{r}^{\infty}mg\,dh $$ But taking into account that g will change ...
Alan Gee's user avatar
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Strange matter objects other than neutron stars?

This question is about celestrial objects which are composed by exotic matter, and exotic matter I define as states of matter that are not commonly encountered such as Bose–Einstein condensates, ...
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What would the collapse of a white dwarf to a neutron star look it

It’s hypothesised that some white dwarves, when raised in mass above the Chandrasekhar limit, will instead of producing a type 1A supernova, will instead collapse into a Neutron star. What would this ...
blademan9999's user avatar
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How much would you weigh at the equator of the fastest spinning pulsar?

Assuming you have a mass of 70 kg, what would your weight be on the equator of PSR J1748−2446ad?
A.J Perez's user avatar