Heated Poles on the Companion of Redback PSR J2339$-$0533

Abstract

We analyze photometry and spectra of the "redback" millisecond pulsar binary J2339$-$0533. These observations include new measurements from Keck and GROND, as well as archival measurements from the OISTER, WIYN, SOAR, and HET telescopes. The parameters derived from GROND, our primary photometric data, describe well the rest of the datasets, raising our confidence in our fitted binary properties. Our fit requires hot-spots (likely magnetic poles) on the surface of the companion star, and we see evidence that these spots move over the 8 yr span of our photometry. The derived binary inclination $i=69.3^{\circ }\pm 2.3^{\circ }$, together with the center-of-mass velocity (from the radial-velocity fits) $K_{\mathrm{C}}=347.0\pm 3.7$ ${\mathrm{km}\mathrm{s}}^{-1}$, give a fairly typical neutron star mass of $1.47\pm 0.09M_{\odot }$.

Accepted for publication in ApJ. 8 pages, 6 figures

References in corpus (6)

• Atmospheric Circulation on Black Widow Companions
• Gamma-ray Timing of Redback PSR J2339-0533: Hints for Gravitational Quadrupole Moment Changes
• B-ducted Heating of Black Widow Companions
• An active, asynchronous companion to a redback millisecond pulsar
• A model for redistributing heat over the surface of irradiated spider companions
• Orbital Modulation of Gamma Rays from PSR~J2339$-$0533

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