The Binary Companion of Young, Relativistic Pulsar J1906 0746Report as inadecuate

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1 AI PANNEKOEK - Astronomical Institute Anton Pannekoek 2 ASTRON - ASTRON 3 Department of Physics and Astronomy, University of British Columbia 4 ARECIBOArecibo Observatory 5 COLUMBIA UNIVERSITY - Columbia Astrophysics Laboratory 6 CRSR - Center for Radiophysics and Space Research 7 Station de radioastronomie de Nancay USN - Unité Scientifique de la Station de Nançay 8 LPC2E - Laboratoire de Physique et Chimie de l-Environnement et de l-Espace 9 Max-Planck-Institut für Radioastronomie 10 Jodrell Bank Observatory 11 ASTRON - Netherlands Institute for Radio Astronomy 12 Jodrell Bank Centre for Astrophysics 13 MPIFR - Max-Planck-Institut für Radioastronomie 14 Lafayette College Easton 15 Carleton College 16 NRAO - National Radio Astronomy Observatory

Abstract : PSR J1906+0746 is a young pulsar in the relativistic binary with the second-shortest known orbital period, of 3.98 hours. We here present a timing study based on five years of observations, conducted with the 5 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 1.29111 M sol, and the companion mass 1.32211 M sol respectively. These masses fit well in the observed collection of double neutron stars, but are also compatible with other white dwarfs around young pulsars such as J1906+0746. Neither radio pulsations nor dispersion-inducing outflows that could have further established the companion nature were detected. We derive an HI-absorption distance, which indicates that an optical confirmation of a white dwarf companion is very challenging. The pulsar is fading fast due to geodetic precession, limiting future timing improvements. We conclude that young pulsar J1906+0746 is likely part of a double neutron star, or is otherwise orbited by an older white dwarf, in an exotic system formed through two stages of mass transfer.

Keywords : binaries: close pulsars: individual: PSR J1906+0746 stars: neutron white dwarfsbinaries: close

Author: Joeri Van Leeuwen - Laura Kasian - Ingrid H. Stairs - D. R. Lorimer - F. Camilo - S. Chatterjee - Ismaël Cognard - G. Desvignes



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