SWIFT J1756.9−2508 explained
SWIFT J1756.9−2508 is a millisecond pulsar with a rotation frequency of 182 Hz (period of 5.5 ms). It was discovered in 2007 by the Swift Gamma-Ray Burst Explorer and found to have a companion with a mass between 0.0067 and 0.030 solar masses. It is thought that the companion is the remnant of a former companion star, now stripped down to a planetary-mass core. The pulsar is accreting mass from this companion, resulting in occasional violent outbursts from the accumulated material on the neutron star.
Planetary system
SWIFT J1756.9-2508's only known planet is notable for its orbital period of less than an hour, about 54 minutes and 43 seconds.
References
- Astrophysical Journal Letters. Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion . 4 . H. A. Krimm . C. B. Markwardt . C. J. Deloye . P. Romano . D. Chakrabarty . S. Campana . J. R. Cummings . D. K. Galloway . N. Gehrels . J. M. Hartman . P. Kaaret . E. H. Morgan . J. Tueller . October 2007 . 10.1086/522959 . 2007ApJ...668L.147K. 0709.1693. 668. 2. L147–L150. 120700539 .
- Astrophysical Journal Letters. ERRATUM: Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion. 4. H. A. Krimm. C. B. Markwardt. C. J. Deloye. P. Romano. D. Chakrabarty. S. Campana. J. R. Cummings. D. K. Galloway. N. Gehrels. J. M. Hartman. P. Kaaret. E. H. Morgan. J. Tueller . October 2009 . 10.1088/0004-637X/703/2/L183 . 2009ApJ...703L.183K. 703. 2. L183 . 0709.1693 . 54031388.
External links
