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20 April 2024

» arxiv » 1510.0721

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Properties and Evolution of the Redback Millisecond Pulsar Binary PSR J2129-0429
Eric C. Bellm ; David L. Kaplan ; Rene P. Breton ; E. Sterl Phinney ; Varun B. Bhalerao ; Fernando Camilo ; Sumit Dahal ; S. G. Djorgovski ; Andrew J. Drake ; J. W. T. Hessels ; Russ R. Laher ; David B. Levitan ; Fraser Lewis ; Ashish A. Mahabal ; Eran O. Ofek ; Thomas A. Prince ; Scott M. Ransom ; Mallory S. E. Roberts ; David M. Russell ; Branimir Sesar ; Jason A. Surace ; Sumin Tang ;
Date:	2 Oct 2015
Abstract:	PSR J2129-0429 is a "redback" eclipsing millisecond pulsar binary with an unusually long 15.2 hour orbit. It was discovered by the Green Bank Telescope in a targeted search of unidentified Fermi gamma-ray sources. The pulsar companion is optically bright (mean $m_R = 16.6$ mag), allowing us to construct the longest baseline photometric dataset available for such a system. We present ten years of archival and new photometry of the companion from LINEAR, CRTS, PTF, the Palomar 60-inch, and LCOGT. Radial velocity spectroscopy using the Double-Beam Spectrograph on the Palomar 200-inch indicates that the pulsar is massive: $1.74pm0.18 M_odot$. The G-type pulsar companion has mass $0.44pm0.04 M_odot$, one of the heaviest known redback companions. It is currently 95\% Roche-lobe filling and only mildly irradiated by the pulsar. We identify a clear 13.1 mmag yr$^{-1}$ secular decline in the mean magnitude of the companion as well as smaller-scale variations in the optical lightcurve shape. This behavior may indicate that the companion is cooling. Binary evolution calculations indicate that PSR J2129-0429 has an orbital period almost exactly at the bifurcation period between systems that converge into tighter orbits as black widows and redbacks and those that diverge into wider pulsar--white dwarf binaries. Its eventual fate may depend on whether it undergoes future episodes of mass transfer and increased irradiation.
Source:	arXiv, 1510.0721
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