Understanding the evolution of close binary systems with radio pulsars

We calculate the evolution of close binary systems (CBSs) formed by a neutron star (behaving as a radio pulsar) and a normal donor star, which evolve either to a helium white dwarf (HeWD) or to ultra-short orbital period systems. We consider X-ray irradiation feedback and evaporation due to radio pu...

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Detalles Bibliográficos
Autores principales: Benvenuto, Omar Gustavo, De Vito, María Alejandra, Horvath, J. E.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
binaries: close
pulsars: general
stars: evolution
stars: neutron
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84865
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84865
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
binaries: close
pulsars: general
stars: evolution
stars: neutron
spellingShingle Ciencias Astronómicas
binaries: close
pulsars: general
stars: evolution
stars: neutron
Benvenuto, Omar Gustavo
De Vito, María Alejandra
Horvath, J. E.
Understanding the evolution of close binary systems with radio pulsars
topic_facet Ciencias Astronómicas
binaries: close
pulsars: general
stars: evolution
stars: neutron
description We calculate the evolution of close binary systems (CBSs) formed by a neutron star (behaving as a radio pulsar) and a normal donor star, which evolve either to a helium white dwarf (HeWD) or to ultra-short orbital period systems. We consider X-ray irradiation feedback and evaporation due to radio pulsar irradiation. We show that irradiation feedback leads to cyclic mass transfer episodes, allowing CBSs to be observed in between episodes as binary radio pulsars under conditions in which standard, non-irradiated models predict the occurrence of a low-mass X-ray binary. This behavior accounts for the existence of a family of eclipsing binary systems known as redbacks. We predict that redback companions should almost fill their Roche lobe, as observed in PSR J1723-2837. This state is also possible for systems evolving with larger orbital periods. Therefore, binary radio pulsars with companion star masses usually interpreted as larger than expected to produce HeWDs may also result in such quasi-Roche lobe overflow states, rather than hosting a carbon-oxygen WD. We found that CBSs with initial orbital periods of Pi < 1 day evolve into redbacks. Some of them produce low-mass HeWDs, and a subgroup with shorter Pi becomes black widows (BWs). Thus, BWs descend from redbacks, although not all redbacks evolve into BWs. There is mounting observational evidence favoring BW pulsars to be very massive (≳ 2 M). As they should be redback descendants, redback pulsars should also be very massive, since most of the mass is transferred before this stage.
format Articulo
Articulo
author Benvenuto, Omar Gustavo
De Vito, María Alejandra
Horvath, J. E.
author_facet Benvenuto, Omar Gustavo
De Vito, María Alejandra
Horvath, J. E.
author_sort Benvenuto, Omar Gustavo
title Understanding the evolution of close binary systems with radio pulsars
title_short Understanding the evolution of close binary systems with radio pulsars
title_full Understanding the evolution of close binary systems with radio pulsars
title_fullStr Understanding the evolution of close binary systems with radio pulsars
title_full_unstemmed Understanding the evolution of close binary systems with radio pulsars
title_sort understanding the evolution of close binary systems with radio pulsars
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/84865
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AT horvathje understandingtheevolutionofclosebinarysystemswithradiopulsars
bdutipo_str Repositorios
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