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American Astronomical Society, Astrophysical Journal, 1(745), p. 21, 2011

DOI: 10.1088/0004-637x/745/1/21

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M2K. II. A triple-planet system orbiting HIP 57274

Journal article published in 2011 by Debra A. Fischer ORCID, Eric Gaidos, Andrew W. Howard, Matthew J. Giguere, John A. Johnson, Geoffrey W. Marcy, Jason T. Wright ORCID, Jeff A. Valenti ORCID, Nikolai Piskunov, Kelsey I. Clubb, Howard Isaacson, Kevin Apps, Sebastien Lepine, Andrew Mann, John Moriarty and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Doppler observations from Keck Observatory have revealed a triple-planet system orbiting the nearby K4V star, HIP 57274. The inner planet, HIP 57274b, is a super-Earth with Msin i = 11.6 M ⊕ (0.036 M Jup), an orbital period of 8.135 ± 0.004 days, and slightly eccentric orbit e = 0.19 ± 0.1. We calculate a transit probability of 6.5% for the inner planet. The second planet has Msin i = 0.4 M Jup with an orbital period of 32.0 ± 0.02 days in a nearly circular orbit (e = 0.05 ± 0.03). The third planet has Msin i = 0.53 M Jup with an orbital period of 432 ± 8 days (1.18 years) and an eccentricity e = 0.23 ± 0.03. This discovery adds to the number of super-Earth mass planets with M sin i < 12 M ⊕ that have been detected with Doppler surveys. We find that 56% ± 18% of super-Earths are members of multi-planet systems. This is certainly a lower limit because of observational detectability limits, yet significantly higher than the fraction of Jupiter mass exoplanets, 20% ± 8%, that are members of Doppler-detected, multi-planet systems.