@article{5b088a616c184b67b386a994bb18a700,
title = "PSR J1024-0719: A millisecond pulsar in an unusual long-period orbit",
abstract = "PSR J1024-0719 is a millisecond pulsar that was long thought to be isolated. However, puzzling results concerning its velocity, distance, and low rotational period derivative have led to a reexamination of its properties. We present updated radio timing observations along with new and archival optical data which show that PSR J1024-0719 is most likely in a long-period (2-20 kyr) binary system with a low-mass (≈0.4 M⊙), low-metallicity (Z ≈ -0.9 dex) main-sequence star. Such a system can explain most of the anomalous properties of this pulsar. We suggest that this system formed through a dynamical exchange in a globular cluster that ejected it into a halo orbit, which is consistent with the low observed metallicity for the stellar companion. Further astrometric and radio timing observations such as measurement of the third period derivative could strongly constrain the range of orbital parameters.",
keywords = "Binaries: General, Pulsars: Individual (PSR J1024-0719), Stars: Distances",
author = "Kaplan, {David L.} and Thomas Kupfer and Nice, {David J.} and Andreas Irrgang and Ulrich Heber and Zaven Arzoumanian and Elif Beklen and Kathryn Crowter and Decesar, {Megan E.} and Demorest, {Paul B.} and Timothy Dolch and Ellis, {Justin A.} and Ferdman, {Robert D.} and Ferrara, {Elizabeth C.} and Emmanuel Fonseca and Gentile, {Peter A.} and Glenn Jones and Jones, {Megan L.} and Simon Kreuzer and Lam, {Michael T.} and Lina Levin and Lorimer, {Duncan R.} and Lynch, {Ryan S.} and McLaughlin, {Maura A.} and Miller, {Adam A.} and Cherry Ng and Pennucci, {Timothy T.} and Prince, {Tom A.} and Ransom, {Scott M.} and Ray, {Paul S.} and Renee Spiewak and Stairs, {Ingrid H.} and Kevin Stovall and Joseph Swiggum and Weiwei Zhu",
note = "Funding Information: We thank J. Creighton, C. Bassa, and S. Phinney for useful discussions. The NANOGrav project receives support from National Science Foundation (NSF) PIRE program award number 0968296 and NSF Physics Frontiers Center award number 1430284. P.S.R.'s work at NRL is supported by the Chief of Naval Research. Pulsar research at UBC is supported by an NSERC Discovery Grant and by the Canadian Institute for Advanced Research. A.A.M. acknowledges support for this work by NASA from a Hubble Fellowship grant: HST-HF-51325.01, awarded by STScI, operated by AURA, Inc., for NASA, under contract NAS 5-26555. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Publisher Copyright: {\textcopyright} 2016. The American Astronomical Society. All rights reserved.",
year = "2016",
doi = "10.3847/0004-637X/826/1/86",
language = "English (US)",
volume = "826",
journal = "Astrophysical Journal",
issn = "0004-637X",
number = "1",
}