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2017AJ....154..137J - Astron. J., 154, 137-137 (2017/October-0)

Spin-orbit misalignments of three jovian planets via Doppler tomography.


Abstract (from CDS):

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 obtain 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 λ=-22.1–6.0+0.8^○^. We reanalyze the radial velocity Rossiter-McLaughlin data on WASP-79 b obtained by Addison et al. using Doppler tomographic methodology. We measure λ=-99.1–3.9+4.1^○^, consistent with but more precise than the value found by Addison et al. For Kepler-448 b we perform a joint fit to the Kepler light curve, Doppler tomographic data, and a radial velocity data set from Lillo-Box et al. We find an approximately aligned orbit (λ=-7.1–2.8+4.2^○^), in agreement with the value found by Bourrier et al. Through analysis of the Kepler light curve we measure a stellar rotation period of Prot=1.27±0.11 days, and use this to argue that the full three-dimensional spin-orbit misalignment is small, ψ∼0.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): line: profiles - planetary systems - planets and satellites: individual: HAT-P-41 b, Kepler-448 b, WASP-79 b - techniques: spectroscopic - techniques: spectroscopic

Simbad objects: 9

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