Astrophys. J., 800, L12 (2015/February-2)
Discovery of PSR J1227-4853: a transition from a low-mass X-ray binary to a redback millisecond pulsar.
ROY J., RAY P.S., BHATTACHARYYA B., STAPPERS B., CHENGALUR J.N., DENEVA J., CAMILO F., JOHNSON T.J., WOLFF M., HESSELS J.W.T., BASSA C.G., KEANE E.F., FERRARA E.C., HARDING A.K. and WOOD K.S.
Abstract (from CDS):
XSS J12270-4859 is an X-ray binary associated with the Fermi Large Area Telescope gamma-ray source 1FGL J1227.9-4852. In 2012 December, this source underwent a transition where the X-ray and optical luminosity dropped and the spectral signatures of an accretion disk disappeared. We report the discovery of a 1.69 millisecond pulsar (MSP), PSR J1227-4853, at a dispersion measure of 43.4 pc/cm3 associated with this source, using the Giant Metrewave Radio Telescope (GMRT) at 607 MHz. This demonstrates that, post-transition, the system hosts an active radio MSP. This is the third system after PSR J1023+0038 and PSR J1824-2452I showing evidence of state switching between radio MSP and low-mass X-ray binary states. We report timing observations of PSR J1227-4853 with the GMRT and Parkes, which give a precise determination of the rotational and orbital parameters of the system. The companion mass measurement of 0.17-0.46 M☉ suggests that this is a redback system. PSR J1227-4853 is eclipsed for about 40% of its orbit at 607 MHz with additional short-duration eclipses at all orbital phases. We also find that the pulsar is very energetic, with a spin-down luminosity of -1035 erg/s. We report simultaneous imaging and timing observations with the GMRT, which suggests that eclipses are caused by absorption rather than dispersion smearing or scattering.
accretion, accretion disks - binaries: eclipsing - pulsars: individual: PSR J1227-4853 - X-rays: binaries
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