Keck Spectroscopy of Millisecond Pulsar J2215+5135: a Moderate-M_NS, High-Inclination Binary

Abstract

We present Keck spectroscopic measurements of the millisecond pulsar binary J2215+5135. These data indicate a neutron-star (NS) mass M_NS=1.6Mo, much less than previously estimated. The pulsar heats the companion face to T_D~9000K; the large heating efficiency may be mediated by the intrabinary shock dominating the X-ray light curve. At the best-fit inclination i=88.8deg, the pulsar should be eclipsed. We find weak evidence for such eclipses in the pulsed gamma-rays; an improved radio ephemeris allows use of up to 5 times more Fermi-LAT gamma-ray photons for a definitive test of this picture. If confirmed, the gamma-ray eclipse provides a novel probe of the dense companion wind and the pulsar magnetosphere.

5 pages, 4 figures submitted to ApJL

References in corpus (3)

• A Spectroscopic Study of the Extreme Black Widow PSR J1311-3430
• Observations and Modeling of the Companions of Short Period Binary Millisecond Pulsars: Evidence for High-Mass Neutron Stars
• Discovery of Gamma-Ray Orbital Modulation in the Black Widow PSR J1311-3430

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