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Astron. Astrophys. 325, 391-400


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Neutrino pair emission due to scattering of electrons off fluxoids
in superfluid neutron star cores

A.D. Kaminker1, D.G. Yakovlev1, and P. Haensel2

1A.F. Ioffe Institute of Physics and Technology, 194021 St. Petersburg, Russia
2N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00716 Warszawa, Poland

Received 25 November 1996 / Accepted 29 January 1997

Abstract

We study the emission of neutrinos, resulting from the scattering of electrons off magnetic flux tubes (fluxoids) in the neutron star cores with superfluid (superconducting) protons. In the absence of proton superfluidity ( FORMULA ), this process transforms into the well known electron synchrotron emission of neutrino pairs in a locally uniform magnetic field B, with the neutrino energy loss rate Q proportional to FORMULA . For temperatures T not much below Tcp, the synchrotron regime ( FORMULA ) persists and the emissivity Q can be amplified by several orders of magnitude due to the appearance of the fluxoids and associated enhancement of the field within them. For lower T, the synchrotron regime transforms into the bremsstrahlung regime ( FORMULA ) similar to the ordinary neutrino-pair bremsstrahlung of electrons which scatter off atomic nuclei. We calculate Q numerically and represent our results through a suitable analytic fit. In addition, we estimate the emissivities of two other neutrino-production mechanisms which are usually neglected - neutrino-pair bremsstrahlung processes due to electron-proton and electron-electron collisions. We show that the electron-fluxoid and electron-electron scattering can provide the main neutrino production mechanisms in the neutron star cores with highly superfluid protons and neutrons at T 5 108 K. The electron-fluxoid scattering is significant if the initial, locally uniform magnetic field B 1013 G.

Key words: dense matter - stars: interiors - stars: neutron

Send offprint requests to: P. Haensel


© European Southern Observatory (ESO) 1997

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