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M2K: II. A Triple-Planet System Orbiting HIP 57274

Fischer, Debra A.; Gaidos, Eric LU ; Howard, Andrew W.; Giguere, Matthew J.; Johnson, John A.; Marcy, Geoffrey W.; Wright, Jason T.; Valenti, Jeff A.; Piskunov, Nikolai and Clubb, Kelsey, et al. (2012) In Astrophysical Journal 745(1).
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 M sin i = 11.6 M-circle plus (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 M sin 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 M sin 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-circle plus that have... (More)
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 M sin i = 11.6 M-circle plus (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 M sin 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 M sin 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-circle plus 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. (Less)
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publication status
published
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keywords
stars: individual (HIP 57274), planetary systems
in
Astrophysical Journal
volume
745
issue
1
publisher
University of Chicago Press
external identifiers
  • wos:000300316600021
  • scopus:84862908185
ISSN
0004-637X
DOI
10.1088/0004-637X/745/1/21
language
English
LU publication?
yes
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bb3cf313-3d7d-4a09-808f-6681dfcc998b (old id 2517447)
date added to LUP
2012-05-15 07:48:35
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2017-05-28 04:08:35
@article{bb3cf313-3d7d-4a09-808f-6681dfcc998b,
  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 M sin i = 11.6 M-circle plus (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 M sin 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 M sin 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 &lt; 12 M-circle plus 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.},
  articleno    = {21},
  author       = {Fischer, Debra A. and Gaidos, Eric and Howard, Andrew W. and Giguere, Matthew J. and Johnson, John A. and Marcy, Geoffrey W. and Wright, Jason T. and Valenti, Jeff A. and Piskunov, Nikolai and Clubb, Kelsey and Isaacson, Howard and Apps, Kevin and Lepine, Sebastien and Mann, Andrew and Moriarty, John and Brewer, John and Spronck, Julien F. P. and Schwab, Christian and Szymkowiak, Andrew},
  issn         = {0004-637X},
  keyword      = {stars: individual (HIP 57274),planetary systems},
  language     = {eng},
  number       = {1},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {M2K: II. A Triple-Planet System Orbiting HIP 57274},
  url          = {http://dx.doi.org/10.1088/0004-637X/745/1/21},
  volume       = {745},
  year         = {2012},
}