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Planets in globular clusters?
Sigurdsson, Steinn
AA(California Univ., Santa Cruz)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L95-L97. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Extrasolar Planets, Globular Clusters, Planetary Systems, Pulsars, Accretion Disks, Computational Astrophysics, Perturbation Theory, Protoplanets
Bibliographic Code:


The discovery of planets around PSR 1257 + 12 suggests that planetary systems may be detected around the recycled pulsars found in globular clusters. Planetary systems in dense clusters have lifetimes to disruption due to perturbations by passing stars comparable to or shorter than the pulsar lifetime, and observations of planets in the cores of clusters may reveal planetary systems formally dynamically unstable on time scales short compared to the characteristic age of the system. Planets formed around cluster pulsars will most likely be restricted to semimajor axes of about 0.1-1.0 AU, while 'scavenged' planets may be observed in wider orbits, with no stable systems expected in the densest clusters. Observation is most probable in the rich high-density precore collapse clusters such as 47 Tuc.

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arXiv e-prints