Spin–Orbit Misalignment and Precession in the Kepler-13Ab Planetary System

Herman, Miranda K. and de Mooij, Ernst J. W. and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Jayawardhana, Ray (2017) Spin–Orbit Misalignment and Precession in the Kepler-13Ab Planetary System. The Astronomical Journal, 155 (1):13. pp. 1-8. ISSN 0004-6256

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Gravity darkening induced by rapid stellar rotation provides us with a unique opportunity to characterize the spin-orbit misalignment of a planetary system through analysis of its photometric transit. We use the gravity-darkened transit modeling code simuTrans to reproduce the transit light curve of Kepler-13Ab by separately analyzing phase-folded transits for 12 short-cadence Kepler quarters. We verify the temporal change in impact parameter indicative of spin-orbit precession identified by Szabó et al. and Masuda, reporting a rate of change day-1. We further investigate the effect of light dilution on the fitted impact parameter and find that less than 1% of additional light is sufficient to explain the seasonal variation seen in the Kepler quarter data. We then extend our precession analysis to the phase curve data from which we report a rate of change day-1. This value is consistent with that of the transit data at a lower significance and provides the first evidence of spin-orbit precession based solely on the temporal variation of the secondary eclipse.

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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: 01 Apr 2022 00:51
Last Modified: 28 Apr 2022 03:34
Uncontrolled Keywords: planets and satellites: individual (Kepler-13, KOI-13); stars: rotation; techniques: photometric; Astrophysics - Earth and Planetary Astrophysics
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/aa991f
URI: http://eprints.usq.edu.au/id/eprint/47416

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