2021-11-19

Astronomers study faint supernova explosions from isolated stars

By yqqlm yqqlm

Visit: Alibaba cloud 11.11 cloud Carnival activity hall

814ef6e72d8f538 - Astronomers study faint supernova explosions from isolated stars

at the very low end of this range, supernova explosions are considered weak and dim, but even the most advanced supernova simulation is challenging to test this hypothesis. In our recently published research, we found a new method to test these weak supernovae: by connecting the weak supernova explosion with the slow-moving neutron star debris, the velocity of neutron stars can accurately estimate the weak supernovae without expensive simulation operations

neutron stars do not shine like other stars, but produce a very narrow radio wave, which may (if we are lucky) point to the earth. As the neutron star rotates, the light seems to flicker, forming a lighthouse effect. When this effect is observed, we call it a pulsar, or pulsar. Recent advances in radio telescopes allow accurate measurements of pulsar velocities. We combine the measurement results with the simulation results of millions of stars and find that the typical high pulsar velocity does not allow many weak supernovae

however, there is a fact to note: many massive stars that produce neutron stars are born in stellar binaries. If a normal supernova occurs in a stellar binary, the residue of the neutron star will experience a huge recoil, just like a shell rushing out of the explosive gunpowder, and it is likely to eject from its companion star, where it may be observed as a single pulsar. However, if the supernova is very weak, the neutron star may not have enough energy to get rid of the gravitational traction of its companion star, and the stellar binary system will remain intact. This is a necessary step to form neutron star binaries, so the existence of these binaries proves that some supernova explosions must be weak

we find that in order to explain the existence of neutron star binaries and the absence of slow pulsars, weak supernovae can only occur in very close stellar binaries, rather than in single and isolated stars. This is very useful for simulating supernovae, and provides a supplement for more and more studies, indicating that weak supernovae may only occur in stellar binaries that have interacted before. Such research, simulating many stars in relatively low detail, is the key to understand the impact of uncertain physics on Star populations, which is not feasible in highly detailed simulation