Questions tagged [neutron-star]
Questions regarding a degenerate star that is mainly composed of neutrons.
1
vote
0answers
46 views
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 ...
1
vote
0answers
46 views
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?
2
votes
2answers
74 views
Could an astronomical process create elements in the islands of stability?
I was reading about heavy elements recently, and I took note of the theorized islands of stability, and how some the elements involved are considerably heavier than anything we've been able to ...
2
votes
1answer
77 views
What is Propeller Effect exactly?
I find the original reference seems to be here. I still do not understand the mechanism. It is necessarily occur in neutron binaries? Anyone can introduce it in detail? This paper is old.
2
votes
2answers
154 views
How big should be a piece of neutron star to reach Earth's mass?
Imagine a neutron star could be broke into pieces.
How big would be the piece matching Earth's mass?
5
votes
4answers
278 views
Why aren't neutron stars full of dark matter?
Dark matter interacts with the gravitational force right? Well, unlike black holes, neutron stars are actually visible, and they're an enormous gravitational sink, so dark matter should collect to ...
5
votes
3answers
220 views
Why do neutron stars collide instead of just revolving around each other like planets revolve around the Sun?
We know about events like two neutron star colliding and resulting in a black hole, also collision of black holes, and collision of galaxies. But we never see a satellite such as a moon colliding with ...
5
votes
3answers
389 views
Is there a possibility that a white dwarf can turn into a neutron star or a black hole?
I know that a white dwarf is mainly balanced by electron degeneracy pressure and that if it gains more than 1.4 solar masses from any source (such as a companion star or a collision), it explodes as a ...
2
votes
0answers
106 views
Core collapse supernova vs Neutron Star
I am reading about massive stars and their final consequences. what I understood is massive stars after throwing out their outer envelop with masses > 1.4 solar Mass turn into neutron stars. But I ...
2
votes
1answer
156 views
What is the light that we see from a neutron star come from?
What hold the electrons in orbit? Is it gravity or the atomic attraction between the protons and neutrons?
I asked this question on Physics SE I hope I improved on the quality enough to do better ...
1
vote
1answer
112 views
Can we create neutron star by pressing earth? Or other objects?
Everywhere I can hear, that if we press anything to the right size, we create black hole.
Can we create neutron star by pressing, for example, our planet? And what if we press something bigger, like ...
11
votes
1answer
258 views
How do we know how fast the surface of a neutron star is rotating?
I understand that we can count pulses in time, but how do we know that the magnetosphere is rotating along with the surface of a neutron star?
Can we measure the rotation of a neutron star in any ...
1
vote
1answer
602 views
Could life survive on a planet orbiting a neutron star? [closed]
Suppose an Earth-like planet orbits a neutron star, though specifically not a pulsar. Is there any possible orbit, around any possible neutron star, in which the planet could support human life?
4
votes
2answers
201 views
Why is neutron star a star?
I am wondering since neutron star is smaller than the average main-sequence stars and it doesn't produce energy via fusion so why do we still call it a star?
4
votes
2answers
147 views
Did the scientists really observed gold and platinum being created from kilonova?
I read that after LIGO and Virgo interferometers detected gravitational waves signal from a kilonova, many ground based telescopes quickly turns their mirrors towards the spot and "sees" gold and ...
1
vote
2answers
229 views
Can a Neutron Star become charged?
If you keep adding electrons or protons to a Neutron star, what would happen? Are there decay processes that convert them to neutrons in the absence of the oppositely charged particle?
12
votes
1answer
220 views
“Who saw” the binary neutron star merger first? What was the sequence of events? (GRB/GW170817)
I'm trying to read Multi-messenger Observations of a Binary Neutron Star Merger the "cast of thousands" OPEN Access ApJ letter 848:L12 (59pp), 2017 October 20 https://doi.org/10.3847/2041-8213/aa91c9 ...
7
votes
1answer
105 views
Energy Source for Gamma Rays from Merging Neutron Stars
When the two neutron stars merged in the latest event, large amounts of gamma rays were emitted. Given that their deorbitting is a result of gravitational wave production, where does the energy for ...
23
votes
2answers
8k views
Which atom is a Neutron star made of?
I understood that everything was made of Atoms.
An atom is the smallest constituent unit of ordinary matter that has
the properties of a chemical element. Every solid, liquid, gas, and
plasma ...
25
votes
1answer
2k views
Are binary neutron star mergers needed to explain the abundance of gold?
The NPR News item Astronomers Strike Gravitational Gold In Colliding Neutron Stars mentions and quotes "Daniel Kasen, a theoretical astrophysicist at the University of California, Berkeley:"
He ...
74
votes
2answers
10k views
Why is the discovery of merging neutron stars important?
I'm fairly certain people here will have heard about it, already, but apparently, two supernova leftovers clashed some 130 million years ago and some billion billion kilometres away ...
What I haven'...
10
votes
1answer
617 views
Do neutron stars shine?
Ignore pulsars and the like, just a neutron star in empty space – does it emit light and neutrinos?
3
votes
1answer
199 views
Neutron star, aging proccess
Is there any information about the future of the neutron star?
What I am interested what happens to it as the time passes. Say a billion years. Would it still be a neutron star? Would it collapse to ...
2
votes
1answer
283 views
Parent stars of our Sun - Where are its remains?
This is in a way related to this question.
Question is: Our star is third generation star, which is explained by existing Barium. That Barium was created by other stars. Now, those stars must have ...
0
votes
3answers
2k views
whose gravitational pull is more stronger , Neutron Star or Black hole?
We know neutron star is very densest in the universe and it weighs the thousand times of our Sun. And Black hole having strong gravitational pull not even light can escape From it . So , whose ...
4
votes
2answers
154 views
How do we know that Singularity is not an object with reasonable radius?
So for example: a Neutron star has a radius of 10km and 2 solar masses.
A singularity can have a radius of 1m and 10 solar masses, with a 1km event horizon radius. Basically it will just be a more ...
3
votes
2answers
122 views
Why do neutrinos take time to scatter?
After a supernova neutrinos get released by electron capture,and they escape in a flood.
My guess is because they have tiny masses and get momentum from momentum conservation.
However, the huge ...
16
votes
3answers
2k views
Shape of neutron stars
I've heard that the more an object spins, the less of a true sphere it is.
Using this logic most of neutron stars would be far from spherical,in general what shape are most neutron stars?
6
votes
2answers
297 views
Magnetars and the Dynamo Effect
How do magnetars create/sustain such strong magnetic fields? If a dynamo effect did create a magnetar, then what creates the magnetic field? The dynamo effect requires an electrically conductive fluid,...
8
votes
1answer
223 views
Inner Workings of Neutron Stars
What are future steps that can be taken in order to learn more about the inner workings of a Neutron Star such as "nuclear pasta" and the materials in the inner core?
0
votes
0answers
58 views
The gravitational effect of a neutron star in our solar system
Imagine a neutron star with a mass of $3\:M_{\odot}$ is present at $10\:AU$ from the Sun, perpendicular to the plane of the solar system. The neutron star traverses over the sun (and the solar system),...
13
votes
2answers
2k views
Do all neutron stars spin?
I know that some of them are pulsars and pulsars spin very fast, but do all of the neutron stars spin? I would think that they would because of conservation of momentum, but I'm really just not sure.
5
votes
1answer
130 views
Is there a significant population of neutron stars outside the galactic plane?
Pulsar kicks originating from supernovae can impart neutron stars with speeds of 100-500 km/s, often at or close to the escape velocity of the Milky Way. Even if a pulsar fails to escape the galaxy, ...
2
votes
1answer
128 views
How could a neutron star cause repeated 'fast radio bursts' detected coming from outside of the galaxy?
According to the ScienceAlert article Mysterious repeating radio signals have been detected coming from outside our galaxy, based on the Letter to Nature "A repeating fast radio burst", there has been ...
1
vote
2answers
141 views
What is the average time between a nebula formation and a neutron star?
I have a star project, and I couldn't find anything on the amount of time it takes from nebula to neutron star.
How long does it take, from a nebula, to form a neutron star?
5
votes
1answer
218 views
How does a neutron star emitting magnetic-dipole radiation lose angular momentum?
Is the ultimate reason that the neutron star loses angular momentum that the magnetic-dipole radiation is not spherically symmetric and photons have momentum?
Just for the loss of angular momentum, ...
4
votes
1answer
121 views
Have we Observed Continuum Emission from Neutron Stars?
Have we detected continuum optical emission from any rotating neutron stars that do not have an accretion disk dominating the light? I ask because I know we have observed Doppler broadening of ...
11
votes
1answer
751 views
No hair and neutron stars
I know black holes can be described by only a few parameters. Given the extreme conditions within a neutron star, how much hair does it have, ie. how much of the original star parameters and ...
9
votes
2answers
619 views
What is the final destination of a neutron star?
As I understand, neutron stars are born as extremely bright, extremely fast spinning cores of stars dying in a supernova. However, several websites tell me that within a course of a few years, the ...
8
votes
1answer
380 views
How far away is the nearest compact star remnant likely to be?
Neutron stars and black holes are hard to detect when they are solitary, and there seems to be big uncertainties about how common they are. White dwarfs are much easier to detect and the nearest one ...
3
votes
1answer
141 views
Will Gaia detect inactive neutron stars?
Will the astrometric precision of the Gaia space telescope be able to detect the gravitational influence of cold old solitary neutron stars on the movements of stars? At least in a statistical sense ...
2
votes
1answer
90 views
Are there any reliable optical measurements of the radius of a neutron star?
I know that there is plenty of theory to predict the size of a neutron star: my question is whether or not there are any reliable size estimates based on observation. Please note that, to be reliable,...
0
votes
2answers
263 views
Is the lower mass limit of a neutron star the same as the upper mass limit of a white dwarf?
If not, when can a white dwarf be more massive than a neutron star?
12
votes
1answer
1k views
How can neutron stars have gaseous atmospheres?
Neutron stars can have small atmospheres. However, they also have extremely strong gravitationally pulls. Shouldn't the all the gas molecules be drawn to the star's surface, and become solids under ...
4
votes
2answers
619 views
Cosmic events as standard candles
Type 1a supernovae are used as standard candles. Are there other high energy cosmic events which can be used as standard candles. For example, collapse of neutron star into a black hole is also ...
1
vote
1answer
629 views
Why can't neutron stars ignite and explode?
Beyond the Chandrasekhar limit, white dwarfs become extremely hot. As a result, previously unfusable carbon can become fusable, causing nuclear reactions. This leads to thermal runaway and ultimately ...
6
votes
2answers
582 views
Why does the Chandrasekhar limit affect white dwarfs differently?
The Chandrasekhar limit is the maximum mass of a stable white dwarf star. Beyond this, a carbon-oxygen white dwarf will typically explode in a type 1a supernova, due to the nuclear reactions at those ...
5
votes
1answer
446 views
Stellar mass limits for Neutron Star and Black Holes
Don't hate on me if I am asking a very basic and straightforward thing. I have a few questions about black holes and neutron stars.
What is the mass range (in terms of solar masses) for a main ...
5
votes
3answers
363 views
If a white dwarf collides with a giant star, could it create a TZO?
Thorne–Żytkow objects (TZOs) form from collisions between neutron stars and main sequence or giant stars. Ultimately, the neutron star becomes the "core" of the giant star.
However, could this also ...
-1
votes
1answer
157 views
Explanation for the first spinning neutron star detected in the Andromeda galaxy?
A new class of Neutron stars has been found in the Andromeda galaxy (M31), This is the first time a Spinning Neutron star has ever been detected by astronomers in M31. The article states-
“pulsars” ...
