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Detailed models of the binary pulsars J1141-6545 and B2303+46

Church, Ross P. LU orcid ; Bush, Stephanie J. ; Tout, Christopher A. and Davies, Melvyn B LU (2006) In Monthly Notices of the Royal Astronomical Society 372(2). p.715-727
Abstract
We have modelled the formation of the eccentric double-degenerate binaries J1141-6545 and B2303+46 using the Henyey-type full stellar evolution code STARS and the population synthesis code BSE. We find that the outcome depends strongly on the common envelope (CE) evolution efficiency parameter alpha(CE) and show that both systems can be modelled with a single value of alpha(CE). The final orbit of the system depends critically on the order of Roche lobe filling events. The phase space of progenitors and the different evolutionary pathways followed by binary stars that form eccentric double-degenerate binaries in the two codes are compared. We show that the pathways are similar between the codes and that the distribution of progenitors in... (More)
We have modelled the formation of the eccentric double-degenerate binaries J1141-6545 and B2303+46 using the Henyey-type full stellar evolution code STARS and the population synthesis code BSE. We find that the outcome depends strongly on the common envelope (CE) evolution efficiency parameter alpha(CE) and show that both systems can be modelled with a single value of alpha(CE). The final orbit of the system depends critically on the order of Roche lobe filling events. The phase space of progenitors and the different evolutionary pathways followed by binary stars that form eccentric double-degenerate binaries in the two codes are compared. We show that the pathways are similar between the codes and that the distribution of progenitors in mass and separation phase space is qualitatively the same, thus validating the use of BSE-like population synthesis for simulations of this type. The phase space of initial parameters is very different to that obtained using ad hoc arguments about the evolution, which shows that such arguments are insufficient to model evolutionary pathways of this complexity. There are some differences associated with the prescription adopted for CE evolution but these are not qualitatively significant. We investigate the dependence of the formation mechanism on wind mass loss and the CE efficiency parameter alpha(CE), showing that it depends strongly on the latter but rather less on the former. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
pulsars : individual, binaries : close, stars : evolution, pulsars : individual : B2303+46, J1141-6545
in
Monthly Notices of the Royal Astronomical Society
volume
372
issue
2
pages
715 - 727
publisher
Oxford University Press
external identifiers
  • wos:000241157100018
  • scopus:33749832931
ISSN
1365-2966
DOI
10.1111/j.1365-2966.2006.10897.x
language
English
LU publication?
yes
id
d470636c-dc52-4942-83f9-089e743a3e95 (old id 387904)
date added to LUP
2016-04-01 11:45:31
date last changed
2020-11-22 03:24:37
@article{d470636c-dc52-4942-83f9-089e743a3e95,
  abstract     = {We have modelled the formation of the eccentric double-degenerate binaries J1141-6545 and B2303+46 using the Henyey-type full stellar evolution code STARS and the population synthesis code BSE. We find that the outcome depends strongly on the common envelope (CE) evolution efficiency parameter alpha(CE) and show that both systems can be modelled with a single value of alpha(CE). The final orbit of the system depends critically on the order of Roche lobe filling events. The phase space of progenitors and the different evolutionary pathways followed by binary stars that form eccentric double-degenerate binaries in the two codes are compared. We show that the pathways are similar between the codes and that the distribution of progenitors in mass and separation phase space is qualitatively the same, thus validating the use of BSE-like population synthesis for simulations of this type. The phase space of initial parameters is very different to that obtained using ad hoc arguments about the evolution, which shows that such arguments are insufficient to model evolutionary pathways of this complexity. There are some differences associated with the prescription adopted for CE evolution but these are not qualitatively significant. We investigate the dependence of the formation mechanism on wind mass loss and the CE efficiency parameter alpha(CE), showing that it depends strongly on the latter but rather less on the former.},
  author       = {Church, Ross P. and Bush, Stephanie J. and Tout, Christopher A. and Davies, Melvyn B},
  issn         = {1365-2966},
  language     = {eng},
  number       = {2},
  pages        = {715--727},
  publisher    = {Oxford University Press},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Detailed models of the binary pulsars J1141-6545 and B2303+46},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2006.10897.x},
  doi          = {10.1111/j.1365-2966.2006.10897.x},
  volume       = {372},
  year         = {2006},
}