Rapid cooling of neutron stars by hyperons and Delta isobars

Details Rapid cooling of neutron stars by hyperons and Delta isobars Rapid cooling of neutron stars by hyperons and Delta isobars

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390l..77p&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. L77-L80.

Physics

118

Cooling, Hyperons, Neutron Stars, Nuclear Isobars, Stellar Temperature, Neutrinos, Nuclear Reactions, Stellar Physics

Scientific paper

Direct Urca processes with hyperons and/or nucleon isobars can occur in dense matter as long as the concentration of Lambda hyperons exceeds a critical value that is less than 3 percent and is typically about 0.1 percent. The neutrino luminosities from the hyperon Urca processes are about 5-100 times less than the typical luminosity from the nucleon direct Urca process, if the latter process is not forbidden, but they are larger than those expected from other sources. These direct Urca processes provide avenues for rapid cooling of neutron stars which invoke neither exotic states nor the large proton fraction (of order 0.11-0.15) required for the nucleon direct Urca process.

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