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

Wittenmyer, Robert A. and Tuomi, Mikko and Butler, R. P. and Jones, H. R. A. and Anglada-Escude, Guillem and Horner, Jonathan and Tinney, C. G. and Marshall, J. P. and Carter, B. D. and Bailey, J. and Salter, G. S. and O'Toole, S. J. and Wright, D. and Crane, J. D. and Schectman, S. A. and Arriagada, P. and Thompson, I. and Minniti, D. and Jenkins, J. S. and Diaz, M. (2014) GJ 832c: a super-earth in the habitable zone. The Astrophysical Journal, 791 (2). p. 114. ISSN 0004-637X

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 16 Jan 2015 03:28
Last Modified: 24 Mar 2017 02:56
Uncontrolled Keywords: astrobiology; planets and satellites: individual (GJ 832); radial velocities
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020101 Astrobiology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/791/2/114
URI: http://eprints.usq.edu.au/id/eprint/26562

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