BSE versus StarTrack: implementations of new wind, remnant-formation, and natal-kick schemes in NBODY7 and their astrophysical consequences. (arXiv:1902.07718v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Banerjee_S/0/1/0/all/0/1">Sambaran Banerjee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Belczynski_K/0/1/0/all/0/1">Krzysztof Belczynski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fryer_C/0/1/0/all/0/1">Christopher L. Fryer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Berczik_P/0/1/0/all/0/1">Peter Berczik</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hurley_J/0/1/0/all/0/1">Jarrod R. Hurley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Spurzem_R/0/1/0/all/0/1">Rainer Spurzem</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_L/0/1/0/all/0/1">Long Wang</a>
The masses of stellar-remnant black holes (BH), as a result of their
formation via massive single- and binary-stellar evolution, is of high interest
in this era of gravitational-wave detection from binary black hole (BBH) and
binary neutron star (BNS) mergers. Here we present new developments in the
N-body evolution program NBODY7 in regards to its stellar-remnant formation and
related schemes. We demonstrate that the newly-implemented stellar-wind and
remnant-formation schemes in the NBODY7 code’s BSE sector, such as the ‘rapid’
and the ‘delayed’ supernova (SN) schemes along with an implementation of
pulsational-pair-instability and pair-instability supernova (PPSN/PSN), now
produces neutron star (NS) and BH masses that agree nearly perfectly, over
large ranges of zero-age-main sequence (ZAMS) mass and metallicity, with those
from the StarTrack population-synthesis program. We also demonstrate the new
implementations of various natal-kick mechanisms on NSs and BHs such as the
‘convection-asymmetry-driven’, ‘collapse-asymmetry-driven’, and
‘neutrino-emission-driven’ kicks, in addition to a fully consistent
implementation of the standard, fallback-dependent, momentum-conserving natal
kick. We find that the SN material fallback causes the convection-asymmetry
kick to effectively retain similar number and mass of BHs in clusters as for
the standard, momentum-conserving kick. The collapse-asymmetry kick would cause
nearly all BHs to retain in clusters irrespective of remnant formation model
and metallicity, whereas the inference of a large number of BHs in GCs would
potentially rule out the neutrino-driven kick mechanism. Pre-SN mergers of
massive primordial binaries would potentially cause BH masses to deviate from
the theoretical, single-star ZAMS mass-remnant mass relation unless a
substantial, up to 40%, of the total merging stellar mass is lost during a
merger process. [Abridged]
The masses of stellar-remnant black holes (BH), as a result of their
formation via massive single- and binary-stellar evolution, is of high interest
in this era of gravitational-wave detection from binary black hole (BBH) and
binary neutron star (BNS) mergers. Here we present new developments in the
N-body evolution program NBODY7 in regards to its stellar-remnant formation and
related schemes. We demonstrate that the newly-implemented stellar-wind and
remnant-formation schemes in the NBODY7 code’s BSE sector, such as the ‘rapid’
and the ‘delayed’ supernova (SN) schemes along with an implementation of
pulsational-pair-instability and pair-instability supernova (PPSN/PSN), now
produces neutron star (NS) and BH masses that agree nearly perfectly, over
large ranges of zero-age-main sequence (ZAMS) mass and metallicity, with those
from the StarTrack population-synthesis program. We also demonstrate the new
implementations of various natal-kick mechanisms on NSs and BHs such as the
‘convection-asymmetry-driven’, ‘collapse-asymmetry-driven’, and
‘neutrino-emission-driven’ kicks, in addition to a fully consistent
implementation of the standard, fallback-dependent, momentum-conserving natal
kick. We find that the SN material fallback causes the convection-asymmetry
kick to effectively retain similar number and mass of BHs in clusters as for
the standard, momentum-conserving kick. The collapse-asymmetry kick would cause
nearly all BHs to retain in clusters irrespective of remnant formation model
and metallicity, whereas the inference of a large number of BHs in GCs would
potentially rule out the neutrino-driven kick mechanism. Pre-SN mergers of
massive primordial binaries would potentially cause BH masses to deviate from
the theoretical, single-star ZAMS mass-remnant mass relation unless a
substantial, up to 40%, of the total merging stellar mass is lost during a
merger process. [Abridged]
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