Thermal Evolution and Light Curves of Young Bare Strange Stars

Details Thermal Evolution and Light Curves of Young Bare Strange Stars Thermal Evolution and Light Curves of Young Bare Strange Stars

2002-04-16

arxiv.org/abs/astro-ph/0204275v2

Phys.Rev.Lett.89:131101,2002

Astronomy and Astrophysics

Astrophysics

Ref [10] added and abstract shortened. 4 pages, 3 figures, revtex4. To be published in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.89.131101

The cooling of a young bare strange star is studied numerically by solving the equations of energy conservation and heat transport for both normal and superconducting strange quark matter inside the star. We show that the thermal luminosity from the strange star surface, due to both photon emission and e+e- pair production, may be orders of magnitude higher than the Eddington limit, for about one day for normal quark matter but possibly for up to a hundred years for superconducting quark matter, while the maximum of the photon spectrum is in hard X-rays with a mean energy of ~ 100 keV or even more. This differs both qualitatively and quantitatively from the photon emission from young neutron stars and provides a definite observational signature for bare strange stars. It is shown that the energy gap of superconducting strange quark matter may be estimated from the light curves if it is in the range from ~ 0.5 MeV to a few MeV.

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