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Kepler-63b: A Giant Planet in a Polar Orbit around a Young Sun-like Star | | Roberto Sanchis-Ojeda
; Joshua N. Winn
; Geoffrey W. Marcy
; Andrew W. Howard
; Howard Isaacson
; John Asher Johnson
; Guillermo Torres
; Simon Albrecht
; Tiago L. Campante
; William J. Chaplin
; Guy R. Davies
; Mikkel L. Lund
; Joshua A. Carter
; Rebekah I. Dawson
; Lars A. Buchhave
; Mark E. Everett
; Debra A. Fischer
; John C. Geary
; Ronald L. Gilliland
; Elliott P. Horch
; Steve B. Howell
; David W. Latham
; | | Date: |
30 Jul 2013 | | Abstract: | We present the discovery and characterization of a giant planet orbiting the
young Sun-like star Kepler-63 (KOI-63, $m_{
m Kp} = 11.6$, $T_{
m eff} =
5576$ K, $M_star = 0.98, M_odot$). The planet transits every 9.43 days, with
apparent depth variations and brightening anomalies caused by large starspots.
The planet’s radius is $6.1 pm 0.2 R_{earth}$, based on the transit light
curve and the estimated stellar parameters. The planet’s mass could not be
measured with the existing radial-velocity data, due to the high level of
stellar activity, but if we assume a circular orbit we can place a rough upper
bound of $120 M_{earth}$ (3$sigma$). The host star has a high obliquity
($psi$ = $104^{circ}$), based on the Rossiter-McLaughlin effect and an
analysis of starspot-crossing events. This result is valuable because almost
all previous obliquity measurements are for stars with more massive planets and
shorter-period orbits. In addition, the polar orbit of the planet combined with
an analysis of spot-crossing events reveals a large and persistent polar
starspot. Such spots have previously been inferred using Doppler tomography,
and predicted in simulations of magnetic activity of young Sun-like stars. | | Source: | arXiv, 1307.8128 | | Services: | Forum | Review | PDF | Favorites | |
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