GJ 832c: A super-earth in the habitable zone

Robert A. Wittenmyer, Mikko Tuomi, R. P. Butler, Hugh Jones, Guillem Anglada-Escudé, Jonathan Horner, C. G. Tinney, J. P. Marshall, B. D. Carter, J. Bailey, G. S. Salter, S. J. O'Toole, D. Wright, J. D. Crane, S. A. Schectman, P. Arriagada, I. Thompson, D. Minniti, J. S. Jenkins, M. Diaz

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Abstract

We report the detection of GJ 832c, a super-Earth orbiting near the inner edge of the habitable zone of GJ 832, an M dwarf previously known to host a Jupiter analog in a nearly circular 9.4 yr orbit. The combination of precise radial-velocity measurements from three telescopes reveals the presence of a planet with a period of 35.68 ± 0.03 days and minimum mass (m sin i) of 5.4 ± 1.0 Earth masses. GJ 832c moves on a low-eccentricity orbit (e = 0.18 ± 0.13) toward the inner edge of the habitable zone. However, given the large mass of the planet, it seems likely that it would possess a massive atmosphere, which may well render the planet inhospitable. Indeed, it is perhaps more likely that GJ 832c is a "super-Venus," featuring significant greenhouse forcing. With an outer giant planet and an interior, potentially rocky planet, the GJ 832 planetary system can be thought of as a miniature version of our own solar system.

Original languageEnglish
Article number114
JournalThe Astrophysical Journal
Volume791
Issue number2
DOIs
Publication statusPublished - 5 Aug 2014

Keywords

  • astrobiology
  • planets and satellites: individual (GJ 832)
  • techniques: radial velocities Online-only material: color figures

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