PSR B1828−11

PSR B1828-11 (also known as PSR B1828-10[2]) is a pulsar approximately 10,000 light-years away in the constellation of Scutum. The star exhibits variations in the timing and shape of its pulses: this was at one stage interpreted as due to a possible planetary system in orbit around the pulsar, though the model required an anomalously large second period derivative of the pulse times.[3] The planetary model was later discarded in favour of precession effects as the planets could not cause the observed shape variations of the pulses.[4][5] While the generally accepted model is that the pulsar is a neutron star undergoing free precession,[6] a model has been proposed that interprets the pulsar as a quark star undergoing forced precession due to an orbiting "quark planet".[7] The entry for the pulsar on SIMBAD lists this hypothesis as being controversial.[2]

PSR B1828-11
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scutum
Right ascension  18h 30m 47.75s
Declination −10° 59′ 10.8″
Distance10,000 ly
(3,200[1] pc)
Spectral typePulsar
Other designations
Database references
SIMBADdata

References
  1. Smith, D. A.; Guillemot, L.; Camilo, F.; Cognard, I.; et al. (2008). "Pulsar timing for the Fermi gamma-ray space telescope". Astronomy and Astrophysics. 492 (3): 923–931. arXiv:0810.1637. Bibcode:2008A&A...492..923S. doi:10.1051/0004-6361:200810285.
  2. "PSR B1828-10 -- Pulsar". SIMBAD. Retrieved 2014-07-02.
  3. Bailes, M.; Lyne, A. G.; Shemar, S. L. (1993). "Limits on pulsar planetary systems from the Jodrell Bank timing database". Planets around pulsars; Proceedings of the Conference. California Inst. of Technology, Pasadena. pp. 19–30. Bibcode:1993ASPC...36...19B.
  4. Stairs, I. H.; Lyne, A. G.; Shemar, S. L. (2000). "Evidence for free precession in a pulsar". Nature. 406 (6795): 484–486. Bibcode:2000Natur.406..484S. doi:10.1038/35020010. PMID 10952302.
  5. Link, Bennett; Epstein, Richard I. "Precession Interpretation of the Isolated Pulsar PSR B1828-11". The Astrophysical Journal. 556 (1): 392–398. arXiv:astro-ph/0101434. Bibcode:2001ApJ...556..392L. doi:10.1086/321581.
  6. Akgün, Taner; Link, Bennett; Wasserman, Ira (2006). "Precession of the isolated neutron star PSR B1828-11". Monthly Notices of the Royal Astronomical Society. 365 (2): 653–672. arXiv:astro-ph/0506606. Bibcode:2006MNRAS.365..653A. doi:10.1111/j.1365-2966.2005.09745.x.
  7. Liu; et al. (2007). "PSR B1828-11: a precession pulsar torqued by a quark planet?". Monthly Notices of the Royal Astronomical Society: Letters. 381 (1): 1–5. arXiv:astro-ph/0411133. Bibcode:2007MNRAS.381L...1L. doi:10.1111/j.1745-3933.2007.00337.x.


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