The Orbit and Companion of Probable γ-Ray Pulsar J2339-0533
Abstract
We have measured dramatic flux and spectral variations through the 0.193 day orbit of the optical counterpart of the unidentified γ-ray source 0FGL J2339.8-0530. This compact object companion is strongly heated, with T eff varying from ~6900 K (superior conjunction) to <3000 K at minimum. A combined fit to the light curve and radial velocity amplitudes imply M 1 ≈ 0.075 M ⊙, M 2 ≈ 1.4M ⊙, and inclination i ≈ 57°. Thus, this is a likely "black widow" system with a {\dot{E}} \approx 10^{34-34.5} \,erg\,s^{-1} 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 γ-ray signal.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2011
- DOI:
- 10.1088/2041-8205/743/2/L26
- arXiv:
- arXiv:1111.3074
- Bibcode:
- 2011ApJ...743L..26R
- Keywords:
-
- gamma rays: stars;
- pulsars: general;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- To Appear in ApJ Letters, 742, L1