Spin-Orbit Misalignments of Three Jovian Planets via Doppler Tomography

Abstract

We present measurements of the spin-orbit misalignments of the hot Jupiters HAT-P-41 b and WASP-79 b, and the aligned warm Jupiter Kepler-448 b. We obtained these measurements with Doppler tomography, where we spectroscopically resolve the line profile perturbation during the transit due to the Rossiter-McLaughlin effect. We analyze time series spectra obtained during portions of five transits of HAT-P-41 b, and find a value of the spin-orbit misalignment of $\lambda =-22.1_{-6.0}^{+0.8\circ }$. We reanalyze the radial velocity Rossiter-McLaughlin data on WASP-79 b obtained by Addison et al. (2013) using Doppler tomographic methodology. We measure $\lambda =-99.1_{-3.9}^{+4.1\circ }$, consistent with but more precise than the value found by Addison et al. (2013). For Kepler-448 b we perform a joint fit to the Kepler light curve, Doppler tomographic data, and a radial velocity dataset from Lillo-Box et al. (2015). We find an approximately aligned orbit ($\lambda =-7.1_{-2.8}^{+4.2\circ }$), in modest disagreement with the value found by Bourrier et al. (2015). Through analysis of the Kepler light curve we measure a stellar rotation period of $P_{\mathrm{rot}}=1.27\pm 0.11$ days, and use this to argue that the full three-dimensional spin-orbit misalignment is small, $\psi \sim 0^{\circ }$.

Accepted for publication in AJ. 16 pages, 8 figures

References in corpus (19)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Dynamical Outcomes of Planet-Planet Scattering
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• Photometric Amplitude Distribution of Stellar Rotation of Kepler KOIs-Indication for Spin-Orbit Alignment of Cool Stars and High Obliquity for Hot Stars
• Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migration
• High-resolution imaging of $Kepler$ planet host candidates. A comprehensive comparison of different techniques
• The Turbulent Origin of Spin-Orbit Misalignment in Planetary Systems
• A Misaligned Prograde Orbit for Kepler-13 Ab via Doppler Tomography
• On the tidal origin of hot Jupiter stellar obliquity trends
• Rossiter--McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems
• WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus
• A Lucky Imaging search for stellar companions to transiting planet host stars
• Discovery of XO-6b: a hot Jupiter transiting a fast rotating F5 star on an oblique orbit
• Long-lived Chaotic Orbital Evolution of Exoplanets in Mean Motion Resonances with Mutual Inclinations
• CYCLOPS2: the fibre image slicer upgrade for the UCLES high resolution spectrograph
• Eccentric Companions to Kepler-448b and Kepler-693b: Clues to the Formation of Warm Jupiters
• Alignment of Protostars and Circumstellar Disks During the Embedded Phase
• Can stellar activity make a planet seem misaligned?
• Eclipsing binaries and fast rotators in the Kepler sample. Characterization via radial velocity analysis from Calar Alto

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