PSR B1828−11 explained

PSR B1828-11 (also known as PSR B1828-10) 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.[1] The planetary model was later discarded in favour of precession effects as the planets could not cause the observed shape variations of the pulses.[2] [3] While the generally accepted model is that the pulsar is a neutron star undergoing free precession,[4] a model has been proposed that interprets the pulsar as a quark star undergoing forced precession due to an orbiting "quark planet".[5] The entry for the pulsar on SIMBAD lists this hypothesis as being controversial.[6]

Notes and References

  1. Limits on pulsar planetary systems from the Jodrell Bank timing database. Bailes, M.. Lyne, A. G.. Shemar, S. L.. Planets around pulsars; Proceedings of the Conference. California Inst. of Technology, Pasadena. 19–30. 1993. 1993ASPC...36...19B.
  2. Evidence for free precession in a pulsar. Stairs, I. H.. Lyne, A. G.. Shemar, S. L.. 2000. Nature. 406. 6795. 484–486. 2000Natur.406..484S. 10.1038/35020010. 10952302. 4415709 .
  3. Precession Interpretation of the Isolated Pulsar PSR B1828-11. Link, Bennett. Epstein, Richard I.. The Astrophysical Journal. 2001 . 556. 1. 392–398. 2001ApJ...556..392L. 10.1086/321581. astro-ph/0101434. 118948361 .
  4. Precession of the isolated neutron star PSR B1828-11. Akgün, Taner. Link, Bennett. Wasserman, Ira. 2006. Monthly Notices of the Royal Astronomical Society. 365. 2. 653–672. 10.1111/j.1365-2966.2005.09745.x. free . 2006MNRAS.365..653A. astro-ph/0506606. 14390165 .
  5. astro-ph/0411133 . Liu . etal . PSR B1828-11: a precession pulsar torqued by a quark planet?. . 381. 1 . L1–L5. 2007 . 2007MNRAS.381L...1L . 10.1111/j.1745-3933.2007.00337.x. free . 119405995 .
  6. Web site: PSR B1828-10 -- Pulsar. SIMBAD. 2014-07-02.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "PSR B1828−11".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.