Spin-orbit misalignments of three Jovian planets via doppler tomography

Johnson, Marshall C. and Cochran, William D. and Addison, Brett C. and Tinney, Chris G. and Wright, Duncan J. (2017) Spin-orbit misalignments of three Jovian planets via doppler tomography. The Astronomical Journal, 154 - Article 137 (4). pp. 1-12. ISSN 0004-6256

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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 lambda = -22.1(-6.0)(+0.8)degrees. We reanalyze the radial velocity Rossiter-McLaughlin data on WASP-79. b obtained by Addison et al. using Doppler tomographic methodology. We measure lambda = -99.1(-3.9)(+4.1)degrees, 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 (lambda = -7.1(-2.8)(+4.2)degrees), in agreement with the value found by Bourrier et al. Through analysis of the Kepler light curve we measure a stellar rotation period of P-rot = 1.27 +/- 0.11 days, and use this to argue that the full three-dimensional spin-orbit misalignment is small, psi similar to 0 degrees.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 06 Sep 2019 06:00
Last Modified: 10 Sep 2019 02:08
Uncontrolled Keywords: line profiles, planetary systems, planets and satellites individual: HAT-P-41 b, Kepler-448 b, WASP-79 b, techniques spectroscopic
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aa8462
URI: http://eprints.usq.edu.au/id/eprint/36379

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