Статья

THE NANOGRAV NINE-YEAR DATA SET: MASS AND GEOMETRIC MEASUREMENTS OF BINARY MILLISECOND PULSARS

Emmanuel FonsecaDepartment of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaTimothy T. PennucciDepartment of Astronomy, Columbia University, 550 W. 120th Street, New York, NY 10027, USAJustin A. EllisJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAI. H. StairsDepartment of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaD. J. NiceDepartment of Physics, Lafayette College, Easton, PA 18042, USAS. M. RansomNational Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USAPaul B. DemorestNational Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USAZaven ArzoumanianCenter for Research and Exploration in Space Science and Technology, X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USAKathryn CrowterDepartment of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaTimothy DolchDepartment of Astronomy, Cornell University, Ithaca, NY 14853, USAR. D. FerdmanDepartment of Physics, McGill University, 3600 rue Universite, Montreal, QC H3A 2T8, CanadaMarjorie GonzalezDepartment of Nuclear Medicine, Vancouver Coastal Health Authority, Vancouver, BC V5Z 1M9, CanadaGlenn JonesDepartment of Astronomy, Columbia University, 550 W. 120th Street, New York, NY 10027, USAMegan L. JonesDepartment of Physics, West Virginia University, P.O. Box 6315, Morgantown, WV 26505, USAMichael T. LamDepartment of Astronomy, Cornell University, Ithaca, NY 14853, USAL. LevinJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UKM. A. McLaughlinDepartment of Physics, West Virginia University, P.O. Box 6315, Morgantown, WV 26505, USAKevin StovallDepartment of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USAJ. K. SwiggumDepartment of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USAWeiwei ZhuMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany

2016en

ABI

Аннотация

ABSTRACT We analyze 24 binary radio pulsars in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) nine-year data set. We make 14 significant measurements of the Shapiro delay, including new detections in four pulsar-binary systems (PSRs J0613−0200, J2017+0603, J2302+4442, and J2317+1439), and derive estimates of the binary-component masses and orbital inclination for these MSP-binary systems. We find a wide range of binary pulsar masses, with values as low as for PSR J1918−0642 and as high as for PSR J1614−2230 (both 68.3% credibility). We make an improved measurement of the Shapiro timing delay in the PSR J1918−0642 and J2043+1711 systems, measuring the pulsar mass in the latter system to be (68.3% credibility) for the first time. We measure secular variations of one or more orbital elements in many systems, and use these measurements to further constrain our estimates of the pulsar and companion masses whenever possible. In particular, we used the observed Shapiro delay and periastron advance due to relativistic gravity in the PSR J1903+0327 system to derive a pulsar mass of (68.3% credibility). We discuss the implications that our mass measurements have on the overall neutron-star mass distribution, and on the “mass/orbital-period” correlation due to extended mass transfer.

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Идентификаторы

DOI: 10.3847/0004-637x/832/2/167

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Цитирований: 3Использованных источников: 0

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