Viscous-thermal evolution of free accretion disks around new born neutron stars

Details Viscous-thermal evolution of free accretion disks around new born neutron stars Viscous-thermal evolution of free accretion disks around new born neutron stars

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267...95m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 95-100.

Astronomy and Astrophysics

Astrophysics

19

Accretion Disks, Neutron Stars, Stellar Evolution, Stellar Temperature, X Ray Binaries, Hydrogen, Massive Stars, Supernova 1987A

Scientific paper

We investigate the viscous and thermal evolution of a free accretion disk possibly formed around a new born neutron star by the fallback material in the supernova explosion. By the viscous diffusion, such a disk gradually expands in the radial direction, conserving its total angular momentum, and cools. When the outer edge of the disk gets cool enough for hydrogen in the disk to recombine, the thermal limit-cycle instability sets in. Two distinct types of outburst behavior are expected. When the instability is rather weak because of small hydrogen abundance or strong irradiation of the disk by the neutron star, the instability causes small amplitude (less than one magnitude) light fluctuations. Typical repetition periods are shorter than a year. When the instability is strong, in contrast, large amplitude (more than two orders of magnitude) outbursts repeat every few years to tens of years. Finally, we discuss possible observational consequences in the context of the late light curves of some supernovae and planet formation around a pulsar.

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