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

Debra A. Fischer, Eric Gaidos, Andrew W. Howard, Matthew J. Giguere, John A. Johnson, Geoffrey W. Marcy, Jason Wright, Jeff A. Valenti, Nikolai Piskunov, Kelsey I. Clubb, Howard Isaacson, Kevin Apps, Sebastien Lepine, Andrew Mann, John Moriarty, John Brewer, Julien F.P. Spronck, Christian Schwab, Andrew Szymkowiak

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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 (0.036M 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 = 0.4M 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 = 0.53M 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.

Original languageEnglish (US)
Article number21
JournalAstrophysical Journal
Volume745
Issue number1
DOIs
StatePublished - Jan 20 2012

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hot isostatic pressing
planets
planet
orbitals
eccentric orbits
circular orbits
extrasolar planets
transit
Jupiter (planet)
eccentricity
Jupiter
observatories
observatory
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fischer, D. A., Gaidos, E., Howard, A. W., Giguere, M. J., Johnson, J. A., Marcy, G. W., ... Szymkowiak, A. (2012). M2K. II. A triple-planet system orbiting HIP 57274. Astrophysical Journal, 745(1), [21]. https://doi.org/10.1088/0004-637X/745/1/21
Fischer, Debra A. ; Gaidos, Eric ; Howard, Andrew W. ; Giguere, Matthew J. ; Johnson, John A. ; Marcy, Geoffrey W. ; Wright, Jason ; Valenti, Jeff A. ; Piskunov, Nikolai ; Clubb, Kelsey I. ; Isaacson, Howard ; Apps, Kevin ; Lepine, Sebastien ; Mann, Andrew ; Moriarty, John ; Brewer, John ; Spronck, Julien F.P. ; Schwab, Christian ; Szymkowiak, Andrew. / M2K. II. A triple-planet system orbiting HIP 57274. In: Astrophysical Journal. 2012 ; Vol. 745, No. 1.
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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 ⊕ (0.036M 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 = 0.4M 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 = 0.53M 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.",
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Fischer, DA, Gaidos, E, Howard, AW, Giguere, MJ, Johnson, JA, Marcy, GW, Wright, J, Valenti, JA, Piskunov, N, Clubb, KI, Isaacson, H, Apps, K, Lepine, S, Mann, A, Moriarty, J, Brewer, J, Spronck, JFP, Schwab, C & Szymkowiak, A 2012, 'M2K. II. A triple-planet system orbiting HIP 57274', Astrophysical Journal, vol. 745, no. 1, 21. https://doi.org/10.1088/0004-637X/745/1/21

M2K. II. A triple-planet system orbiting HIP 57274. / Fischer, Debra A.; Gaidos, Eric; Howard, Andrew W.; Giguere, Matthew J.; Johnson, John A.; Marcy, Geoffrey W.; Wright, Jason; Valenti, Jeff A.; Piskunov, Nikolai; Clubb, Kelsey I.; Isaacson, Howard; Apps, Kevin; Lepine, Sebastien; Mann, Andrew; Moriarty, John; Brewer, John; Spronck, Julien F.P.; Schwab, Christian; Szymkowiak, Andrew.

In: Astrophysical Journal, Vol. 745, No. 1, 21, 20.01.2012.

Research output: Contribution to journalArticle

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T1 - M2K. II. A triple-planet system orbiting HIP 57274

AU - Fischer, Debra A.

AU - Gaidos, Eric

AU - Howard, Andrew W.

AU - Giguere, Matthew J.

AU - Johnson, John A.

AU - Marcy, Geoffrey W.

AU - Wright, Jason

AU - Valenti, Jeff A.

AU - Piskunov, Nikolai

AU - Clubb, Kelsey I.

AU - Isaacson, Howard

AU - Apps, Kevin

AU - Lepine, Sebastien

AU - Mann, Andrew

AU - Moriarty, John

AU - Brewer, John

AU - Spronck, Julien F.P.

AU - Schwab, Christian

AU - Szymkowiak, Andrew

PY - 2012/1/20

Y1 - 2012/1/20

N2 - 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 ⊕ (0.036M 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 = 0.4M 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 = 0.53M 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.

AB - 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 ⊕ (0.036M 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 = 0.4M 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 = 0.53M 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.

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Fischer DA, Gaidos E, Howard AW, Giguere MJ, Johnson JA, Marcy GW et al. M2K. II. A triple-planet system orbiting HIP 57274. Astrophysical Journal. 2012 Jan 20;745(1). 21. https://doi.org/10.1088/0004-637X/745/1/21