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Kepler 18-b, c, and d: A System Of Three Planets Confirmed by Transit Timing Variations, Lightcurve Validation, Spitzer Photometry and Radial Velocity Measurements | | William D. Cochran
; Daniel C. Fabrycky
; Guillermo Torres
; Francois Fressin
; Jean-Michel Desert
; Darin Ragozzine
; Dimitar Sasselov
; Jonathan J. Fortney
; Jason F. Rowe
; Erik J. Brugamyer
; Stephen T. Bryson
; Joshua A. Carter
; David R. Ciardi
; Steve B. Howell
; Jason H. Steffen
; William. J. Borucki
; David G. Koch
; Joshua N. Winn
; William F. Welsh
; Kamal Uddin
; Peter Tenenbaum
; M. Still
; Sara Seager
; Samuel N. Quinn
; F. Mullally
; Neil Miller
; Geoffrey W. Marcy
; Phillip J. MacQueen
; Philip Lucas
; Jack J. Lissauer
; David W. Latham
; Heather Knutson
; K. Kinemuchi
; John A. Johnson
; Jon M. Jenkins
; Howard Isaacson
; Andrew Howard
; Elliott Horch
; Matthew J. Holman
; Christopher E. Henze
; Michael R. Haas
; Ronald L. Gilliland
; Thomas N. Gautier III
; Eric B. Ford
; Debra A. Fischer
; Mark Everett
; Michael Endl
; Brice-Oliver Demory
; Drake Deming
; David Charbonneau
; Douglas Caldwell
; Lars Buchhave
; Timothy M. Brown
; Natalie Batalha
; | | Date: |
4 Oct 2011 | | Abstract: | We report the detection of three transiting planets around a Sunlike star,
which we designate Kepler-18. The transit signals were detected in photometric
data from the Kepler satellite, and were confirmed to arise from planets using
a combination of large transit-timing variations, radial-velocity variations,
Warm-Spitzer observations, and statistical analysis of false-positive
probabilities. The Kepler-18 star has a mass of 0.97M_sun, radius 1.1R_sun,
effective temperature 5345K, and iron abundance [Fe/H]= +0.19. The planets have
orbital periods of approximately 3.5, 7.6 and 14.9 days. The innermost planet
"b" is a "super-Earth" with mass 6.9 pm 3.4M_earth, radius 2.00 pm
0.10R_earth, and mean density 4.9 pm 2.4 g cm^-3. The two outer planets "c"
and "d" are both low-density Neptune-mass planets. Kepler-18c has a mass of
17.3 pm 1.9M_earth, radius 5.49 pm 0.26R_earth, and mean density 0.59 pm
0.07 g cm^-3, while Kepler-18d has a mass of 16.4 pm 1.4M_earth, radius 6.98
pm 0.33R_earth, and mean density 0.27 pm 0.03 g cm^-3. Kepler-18c and
Kepler-18d have orbital periods near a 2:1 mean-motion resonance, leading to
large and readily detected transit timing variations. | | Source: | arXiv, 1110.0820 | | Services: | Forum | Review | PDF | Favorites | |
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