The Orbit and Companion of Probable gamma-ray Pulsar J2339-0533

Details The Orbit and Companion of Probable gamma-ray Pulsar J2339-0533 The Orbit and Companion of Probable gamma-ray Pulsar J2339-0533

2011-11-13

arxiv.org/abs/1111.3074v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

To Appear in ApJ Letters, 742, L1

Scientific paper

We have measured dramatic flux and spectral variations through the 0.193d orbit of the optical counterpart of the unidentified gamma-ray source 0FGL J2339.8-0530. This compact object companion is strongly heated, with T_eff varying from ~6900K (superior conjunction) to <3000K at minimum. A combined fit to the light curve and radial velocity amplitudes implies M_1 ~ 0.075M_sun, M_2 ~ 1.4 M_sun and inclination i ~ 57deg. Thus this is a likely `black widow' system with Edot~10^{34-34.5} erg/s pulsar driving companion mass loss. This wind, also suggested by the X-ray light curve, may prevent radio pulse detection. Our measurements constrain the pulsar's reflex motion, increasing the possibility of a pulse detection in the gamma-ray signal.

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