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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731949.0, MPI für Astronomie / Publikationen_mpia
Properties and evolution of the redback millisecond pulsar binary PSR J2129-0429
Authors:Bellm, E. C.; Kaplan, D. L.; Breton, R. P.; Phinney, E. S.; Bhalerao, V. B.; Camilo, F.; Dahal, S.; Djorgovski, S. G.; Drake, A. J.; Hessels, J. W. T.; Laher, R. R.; Levitan, D. B.; Lewis, F.; Mahabal, A. A.; Ofek, E. O.; Prince, T. A.; Ransom, S. M.; Roberts, M. S. E.; Russell, D. M.; Sesar, B.; Surace, J. A.; Tang, S.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 74 (12 pp)
Audience:Not Specified
Abstract / Description:PSR J2129-0429 is a “redback” eclipsing millisecond pulsar binary with an unusually long 15.2 hr 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 mR = 16.6 mag), allowing us to construct the longest baseline photometric data set available for such a system. We present 10 years of archival and new photometry of the companion from the Lincoln Near-Earth Asteroid Research Survey, the Catalina Real-time Transient Survey, the Palomar Transient Factory, the Palomar 60 inch, and the Las Cumbres Observatory Global Telescope. Radial velocity spectroscopy using the Double-Beam Spectrograph on the Palomar 200 inch indicates that the pulsar is massive: 1.74 ± 0.18 {M}. The G-type pulsar companion has mass 0.44 ± 0.04 {M}, one of the heaviest known redback companions. It is currently 95 ± 1% 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 light curve 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.
Free Keywords:pulsars: individual: PSR J2129–0429
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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