# PSR J1311-3430: A Heavyweight Neutron Star with a Flyweight Helium Companion

@article{Romani2012PSRJA,
title={PSR J1311-3430: A Heavyweight Neutron Star with a Flyweight Helium Companion},
author={Roger W. Romani and Alexei V. Filippenko and Jeffrey M Silverman and S. Bradley Cenko and J. Greiner and Arne Rau and Jonny Elliott and H. J. Pletsch},
journal={The Astrophysical Journal},
year={2012},
volume={760},
pages={1-6}
}
We have obtained initial spectroscopic observations and additional photometry of the newly discovered Pb = 94 minute γ-ray black-widow pulsar PSR J1311–3430. The Keck spectra show a He-dominated, nearly H-free photosphere and a large radial-velocity amplitude of 609.5 ± 7.5 km s–1. Simultaneous seven-color GROND photometry further probes the heating of this companion, and shows the presence of a flaring infrared excess. We have modeled the quiescent light curve, constraining the orbital…

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