A young white dwarf companion to pulsar B1620-26: Evidence for early planet formation

Steinn Sigurdsson, Harvey B. Richer, Brad M. Hansen, Ingrid H. Stairs, Stephen E. Thorsett

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Abstract

The pulsar B1620-26 has two companions, one of stellar mass and one of planetary mass. We detected the stellar companion with the use of Hubble Space Telescope observations. The color and magnitude of the stellar companion indicate that it is an undermassive white dwarf (0.34 ± 0.04 solar mass) of age 480 × 106 ± 140 × 106 years. This places a constraint on the recent history of this triple system and supports a scenario in which the current configuration arose through a dynamical exchange interaction in the cluster core. This implies that planets may be relatively common in low-metallicity globular clusters and that planet formation is more widespread and has happened earlier than previously believed.

Original languageEnglish (US)
Pages (from-to)193-196
Number of pages4
JournalScience
Volume301
Issue number5630
DOIs
StatePublished - Jul 11 2003

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Sigurdsson, S., Richer, H. B., Hansen, B. M., Stairs, I. H., & Thorsett, S. E. (2003). A young white dwarf companion to pulsar B1620-26: Evidence for early planet formation. Science, 301(5630), 193-196. https://doi.org/10.1126/science.1086326