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M2K: II. A Triple-Planet System Orbiting HIP 57274 | | Debra A. Fischer
; Eric Gaidos
; Andrew Howard
; Matthew Giguere
; John A. Johnson
; Geoffrey W. Marcy
; Jason T. Wright
; Kelsey I. Clubb
; Howard Isaacson
; Kevin Apps
; Sebastien Lepine
; Andrew Mann
; John Moriarty
; John Brewer
; Julien Spronck
; Christian Schwab
; Andrew Szymkowiak
; | | Date: |
13 Sep 2011 | | Abstract: | Doppler observations from Keck Observatory have revealed a triple planet
system orbiting the nearby mid-type K dwarf, HIP 57274. The inner planet, HIP
57274b, is a super-Earth with msini = 11.6 mearth (0.036 mjup), an orbital
period of 8.135 $pm$ 0.004 d, and slightly eccentric orbit $e=0.19 pm 0.1$.
We calculate a transit probability of 6.5% for the inner planet. The second
planet has msini = 0.4 mjup with an orbital period of 32.0 $pm 0.02$ d in
a nearly circular orbit, and $e = 0.05 pm 0.03$. The third planet has msini
= 0.53 mjup with an orbital period of 432 $pm 8$ d (1.18 years) and an
eccentricity $e = 0.23 pm 0.03$. This discovery adds to the number of super
Earth mass planets with $msini < 12 mearth $ that have been detected with
Doppler surveys. We find that 56 $pm 18$% 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, $20 pm 8$%, that are members of Doppler-detected,
multi-planet systems. | | Source: | arXiv, 1109.2926 | | Services: | Forum | Review | PDF | Favorites | |
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