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Title: THE BINARY COMPANION OF YOUNG, RELATIVISTIC PULSAR J1906+0746

PSR J1906+0746 is a young pulsar in the relativistic binary with the second-shortest known orbital period, of 3.98 hr. We here present a timing study based on five years of observations, conducted with the five largest radio telescopes in the world, aimed at determining the companion nature. Through the measurement of three post-Keplerian orbital parameters, we find the pulsar mass to be 1.291(11) M {sub ☉}, and the companion mass 1.322(11) M {sub ☉}, respectively. These masses fit well in the observed collection of double neutron stars (DNSs), but are also compatible with other systems where a young pulsar such as J1906+0746 is orbited by a white dwarf (WD). Neither radio pulsations nor dispersion-inducing outflows that could have further established the companion nature were detected. We derive an H I-absorption distance, which indicates that an optical confirmation of a WD companion is very challenging. The pulsar is fading fast due to geodetic precession, limiting future timing improvements. We conclude that the young pulsar J1906+0746 is likely part of a DNS, or is otherwise orbited by an older WD, in an exotic system formed through two stages of mass transfer.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ; ;  [7] ; ;  [8] ;  [9] ;  [10] ;  [11]
  1. ASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo (Netherlands)
  2. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada)
  3. Department of Physics, West Virginia University, Morgantown, WV 26506 (United States)
  4. Arecibo Observatory, HC3 Box 53995, Arecibo, PR 00612 (United States)
  5. Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853 (United States)
  6. Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans (France)
  7. Max-Planck-Institut für Radioastronomie, D-53121 Bonn (Germany)
  8. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)
  9. Department of Physics, Lafayette College, Easton, PA 18042 (United States)
  10. NRAO (National Radio Astronomy Observatory), Charlottesville, VA 22903 (United States)
  11. Department of Physics and Astronomy, Carleton College, Northfield, MN 55057 (United States)
Publication Date:
OSTI Identifier:
22364600
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 798; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; BINARY STARS; EARTH PLANET; GLOBAL ASPECTS; MASS TRANSFER; NEUTRON STARS; NEUTRONS; ORBITS; PULSARS; PULSATIONS; RADIO TELESCOPES; RELATIVISTIC RANGE; WHITE DWARF STARS