ARECIBO PALFA SURVEY AND EINSTEIN@HOME: BINARY PULSAR DISCOVERY BY VOLUNTEER COMPUTING

作者：Knispel B^*; Lazarus P; Allen B; Anderson D; Aulbert C; Bhat N D R; Bock O; Bogdanov S; Brazier A; Camilo F; Chatterjee S; Cordes J M; Crawford F; Deneva J S; Desvignes G; Fehrmann H; Freire P C C; Hammer D; Hessels J W T; Jenet F A; Kaspi V M; Kramer M; van Leeuwen J; Lorimer D R; Lyne A G; Machenschalk B; McLaughlin M A; Messenger C; Nice D J; Papa M A; Pletsch H J; Prix R; Ransom S M; Siemens X; Stairs I H

来源：Astrophysical Journal Letters, 2011, 732(1): L1.

DOI：10.1088/2041-8205/732/1/L1

• pulsars: general
• pulsars: individual (J1952+2630)
• stars: neutron
• white dwarfs

We report the discovery of the 20.7 ms binary pulsar J1952+2630, made using the distributed computing project Einstein@Home in Pulsar ALFA survey observations with the Arecibo telescope. Follow-up observations with the Arecibo telescope confirm the binary nature of the system. We obtain a circular orbital solution with an orbital period of 9.4 hr, a projected orbital radius of 2.8 lt-s, and a mass function of f = 0.15M(circle dot) by analysis of spin period measurements. No evidence of orbital eccentricity is apparent; we set a 2 sigma upper limit e less than or similar to 1.7 x 10(-3). The orbital parameters suggest a massive white dwarf companion with a minimum mass of 0.95 M-circle dot, assuming a pulsar mass of 1.4 M-circle dot. Most likely, this pulsar belongs to the rare class of intermediate-mass binary pulsars. Future timing observations will aim to determine the parameters of this system further, measure relativistic effects, and elucidate the nature of the companion star.

• 出版日期2011-5-1