Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fallback supernova assembly of heavy binary neutron stars and light
  black hole-neutron star pairs and the common stellar ancestry of GW190425 and
  GW200115   The detection of the unusually heavy binary neutron star merger GW190425
marked a stark contrast to the mass distribution from known Galactic pulsars in
double neutron star binaries and gravitational-wave source GW170817. We suggest
here a formation channel for heavy binary neutron stars and light black hole -
neutron star binaries in which massive helium stars, which had their hydrogen
envelope removed during a common envelope phase, remain compact and avoid mass
transfer onto the neutron star companion, possibly avoiding pulsar recycling.
We present three-dimensional simulations of the supernova explosion of the
massive stripped helium star and follow the mass fallback evolution and the
subsequent accretion onto the neutron star companion. We find that fallback
leads to significant mass growth in the newly formed neutron star. This can
explain the formation of heavy binary neutron star systems such as GW190425, as
well as predict the assembly of light black hole - neutron star systems such as
GW200115. This formation avenue is consistent with the observed
mass-eccentricity correlation of binary neutron stars in the Milky Way.
Finally, avoiding mass transfer suggests an unusually long spin-period
population of pulsar binaries in our Galaxy.

34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: eess