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Title:
PSR B1620-26 - A binary radio pulsar with a planetary companion?
Authors:
Thorsett, S. E.; Arzoumanian, Z.; Taylor, J. H.
Affiliation:
AA(Owens Valley Radio Observatory, Pasadena, CA), AB(Princeton Univ., NJ), AC(Princeton Univ., NJ)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 412, no. 1, p. L33-L36. (ApJL Homepage)
Publication Date:
07/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Companion Stars, Periodic Variations, Pulsars, Stellar Mass, Planetary Systems, Space Observations (From Earth), Time Measurement
DOI:
10.1086/186933
Bibliographic Code:
1993ApJ...412L..33T

Abstract

PSR B1620-26, in the globular cluster M4, is a millisecond pulsar with an approximately 0.3 solar mass companion in an approximately 0.7 AU orbit. It was recently realized (Backer, 1993) that timing observations of this pulsar show, in addition to a linear spin-down, a large-period second derivative naturally interpreted as evidence for a varying acceleration, or jerk, of the pulsar binary. We describe timing observations of PSR B1620-26 taken over a 5-yr period. The measured acceleration and jerk are inconsistent with acceleration by the mean gravitational field of M4, and an encounter with another star close enough to cause the observed acceleration is very unlikely. The data are consistent with acceleration by either a planet in an approximately 10-U orbit or a star in an approximately 50-AU orbit. We therefore believe that PSR B1620-26 is likely to be either the first pulsar in a triple stellar system or part of the first binary star system with a planet, possibilities that can be distinguished with further observations over the next decade or two.

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