A Young White Dwarf Companion to Pulsar B1620-26: Evidence for Early Planet Formation

  title={A Young White Dwarf Companion to Pulsar B1620-26: Evidence for Early Planet Formation},
  author={Steinn Sigurdsson and Harvey B. Richer and Brad Hansen and Ingrid H. Stairs and Stephen Erik Thorsett},
  pages={193 - 196}
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… 
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