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Title:
A planetary system around the millisecond pulsar PSR1257 + 12
Authors:
Wolszczan, A.; Frail, D. A.
Affiliation:
AA(Arecibo Observatory, PR), AB(National Radio Astronomy Observatory, Socorro, NM)
Publication:
Nature (ISSN 0028-0836), vol. 355, Jan. 9, 1992, p. 145-147. (Nature Homepage)
Publication Date:
01/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Binary Stars, Extrasolar Planets, Orbital Mechanics, Planetary Systems, Pulsars, Accretion Disks, Least Squares Method, Neutron Stars, Radio Astronomy, Supernova Remnants
DOI:
10.1038/355145a0
Bibliographic Code:
1992Natur.355..145W

Abstract

Precise timing measurements of pulses from the recently discovered 6.2 ms pulsar PSR1257 + 12 are used to demonstrate that, rather than being associated with a stellar object, the pulsar is orbited by two or more planet-sized bodies. The planets detected so far have masses of at least 2.8 and 3.4 earth masses. Their respective distances from the pulsar are 0.47 AU and 0.36 AU, and they move in almost circular orbits with periods of 98.2 and 66.6 days. Observations indicate that at least one more planet may be present in this system. The detection of a planetary system around a nearby old neutron star, together with the recent report on a planetary companion to the pulsar PSR1829 - 10, raises the possibility that a nonnegligible fraction of neutron star observable as radio pulsars may be orbited by planetlike bodies.
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