The White Dwarf Companion of a 2 M_sun Neutron Star

Details The White Dwarf Companion of a 2 M_sun Neutron Star The White Dwarf Companion of a 2 M_sun Neutron Star

2011-06-27

arxiv.org/abs/1106.5497v1

2011, ApJ, 737, L1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 3 figures, 2 tables

Scientific paper

10.1088/2041-8205/737/1/L1

We report the optical discovery of the companion to the 2 M_sun millisecond pulsar PSR J1614-2230. The optical colors show that the 0.5 M_sun companion is a 2.2 Gyr old He-CO white dwarf. We infer that $\dot{M}$ during the accretion phase is <10^{-2}\dot{M}_{edd}. We show that the pulsar was born with a spin close to its current value, well below the rebirth line. The spin-down parameters, the mass of the pulsar, and the age of the system challenge the simple recycling model for the formation of millisecond pulsars.

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