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Discovery and Rossiter-McLaughlin Effect of Exoplanet Kepler-8b | | Jon M. Jenkins
; William J. Borucki
; David G. Koch
; Geoffrey W. Marcy
; William D. Cochran
; Gibor Basri
; Natalie M. Batalha
; Lars A. Buchhave
; Tim M. Brown
; Douglas A. Caldwell
; Edward W. Dunham
; Michael Endl
; Debra A. Fischer
; Thomas N. Gautier III
; John C. Geary
; Ronald L. Gilliland
; Steve B. Howell
; Howard Isaacson
; John Asher Johnson
; David W. Latham
; Jack J. Lissauer
; David G. Monet
; Jason F. Rowe
; Dimitar D. Sasselov
; William F.Welsh
; Andrew W. Howard
; Phillip MacQueen
; Hema Chandrasekaran
; Joseph D. Twicken
; Stephen T. Bryson
; Elisa V. Quintana
; Bruce D. Clarke
; Jie Li
; Christopher Allen
; Peter Tenenbaum
; Hayley Wu
; Soren Meibom
; Todd C. Klaus
; Christopher K. Middour
; Miles T. Cote
; Sean McCauliff
; Forrest R. Girouard
; Jay P. Gunter
; Bill Wohler
; Jennifer R. Hall
; Khadeejah Ibrahim
; AKM Kamal Uddin
; Michael S. Wu
; Paresh A. Bhavsar
; Jeffrey Van Cleve
; David L. Pletcher
; Jessie A. Dotson
; Michael R. Haas
; | | Date: |
4 Jan 2010 | | Abstract: | We report the discovery and the Rossiter-McLaughlin effect of Kepler-8b, a
transiting planet identified by the NASA Kepler Mission. Kepler photometry and
Keck-HIRES radial velocities yield the radius and mass of the planet around
this F8IV subgiant host star. The planet has a radius RP = 1.419 RJ and a mass,
MP = 0.60 MJ, yielding a density of 0.26 g cm^-3, among the lowest density
planets known. The orbital period is P = 3.523 days and orbital semima jor axis
is 0.0483+0.0006/-0.0012 AU. The star has a large rotational v sin i of 10.5
+/- 0.7 km s^-1 and is relatively faint (V = 13.89 mag), both properties
deleterious to precise Doppler measurements. The velocities are indeed noisy,
with scatter of 30 m s^-1, but exhibit a period and phase consistent with the
planet implied by the photometry. We securely detect the Rossiter-McLaughlin
effect, confirming the planet’s existence and establishing its orbit as
prograde. We measure an inclination between the projected planetary orbital
axis and the projected stellar rotation axis of lambda = -26.9 +/- 4.6 deg,
indicating a moderate inclination of the planetary orbit. Rossiter-McLaughlin
measurements of a large sample of transiting planets from Kepler will provide a
statistically robust measure of the true distribution of spin-orbit
orientations for hot jupiters in general. | | Source: | arXiv, 1001.0416 | | Services: | Forum | Review | PDF | Favorites | |
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