Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modelling the formation of the first two neutron star-black hole
  mergers, GW200105 and GW200115: metallicity, chirp masses and merger remnant
  spins   The two neutron star-black hole mergers (GW200105 and GW200115) observed in
gravitational waves by advanced LIGO and Virgo, mark the first ever discovery
of such binaries in nature. We study these two neutron star-black hole systems
through isolated binary evolution, using a grid of population synthesis models.
Using both mass and spin observations (chirp mass, effective spin and remnant
spin) of the binaries, we probe their different possible formation channels in
different metallicity environments. Our models only support LIGO data when
assuming the black hole is non spinning. Our results show a strong preference
that GW200105 and GW200115 formed from stars with sub-solar metallicities
$Z\lesssim 0.005$. Only two metal-rich ($Z=0.02$) models are in agreement with
GW200115. We also find that chirp mass and remnant spins jointly aid in
constraining the models, whilst the effective spin parameter does not add any
further information. We also present the observable (i.e. post selection
effects) median values of spin and mass distribution from all our models, which
maybe used as a reference for future mergers. Further, we show that the remnant
spin parameter distribution exhibits distinguishable features in different
neutron star-black hole sub-populations. We find that non-spinning, first born
black holes dominate significantly the merging neutron star-black hole
population, ensuring electromagnetic counterparts to such mergers a rare
affair.

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The categories of this paper are: hep-th
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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: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org