TY - JOUR
T1 - A misaligned prograde orbit for Kepler-13 Ab via doppler tomography
AU - Johnson, Marshall C.
AU - Cochran, William D.
AU - Albrecht, Simon
AU - Dodson-Robinson, Sarah E.
AU - Winn, Joshua N.
AU - Gullikson, Kevin
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2014/7/20
Y1 - 2014/7/20
N2 - Transiting planets around rapidly rotating stars are not amenable to precise radial velocity observations, such as are used for planet candidate validation, as they have wide, rotationally broadened stellar lines. Such planets can, however, be observed using Doppler tomography, wherein stellar absorption line profile distortions during transit are spectroscopically resolved. This allows the validation of transiting planet candidates and the measurement of the stellar spin-planetary orbit (mis)alignment, which is an important statistical probe of planetary migration processes. We present Doppler tomographic observations that provide direct confirmation of the hot Jupiter Kepler-13 Ab and also show that the planet has a prograde, misaligned orbit with λ = 58.°6 ± 2.°0. Our measured value of the spin-orbit misalignment is in significant disagreement with the value of λ = 23° ± 4° previously measured by Barnes et al. (2011) from the gravity-darkened Kepler light curve. We also place an upper limit of 0.75 M (95% confidence) on the mass of Kepler-13 C, the spectroscopic companion to Kepler-13 B, which is the proper-motion companion of the planet host star Kepler-13 A.
AB - Transiting planets around rapidly rotating stars are not amenable to precise radial velocity observations, such as are used for planet candidate validation, as they have wide, rotationally broadened stellar lines. Such planets can, however, be observed using Doppler tomography, wherein stellar absorption line profile distortions during transit are spectroscopically resolved. This allows the validation of transiting planet candidates and the measurement of the stellar spin-planetary orbit (mis)alignment, which is an important statistical probe of planetary migration processes. We present Doppler tomographic observations that provide direct confirmation of the hot Jupiter Kepler-13 Ab and also show that the planet has a prograde, misaligned orbit with λ = 58.°6 ± 2.°0. Our measured value of the spin-orbit misalignment is in significant disagreement with the value of λ = 23° ± 4° previously measured by Barnes et al. (2011) from the gravity-darkened Kepler light curve. We also place an upper limit of 0.75 M (95% confidence) on the mass of Kepler-13 C, the spectroscopic companion to Kepler-13 B, which is the proper-motion companion of the planet host star Kepler-13 A.
KW - line: profiles
KW - planetary systems
KW - planets and satellites: individual (Kepler-13 Ab)
KW - techniques: spectroscopic
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U2 - 10.1088/0004-637X/790/1/30
DO - 10.1088/0004-637X/790/1/30
M3 - Article
AN - SCOPUS:84904214199
VL - 790
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 30
ER -