Stellar pulsations interfering with the transit light curve: Configurations with false positive misalignment
نویسندگان
چکیده
Asymmetric features in exoplanet transit light curves are often interpreted as a gravity darkening effect especially if there is spectroscopic evidence of spin-orbit misalignment. Since other processes can also lead to curve asymmetries this may inaccurate parameters. Here we investigate the case non-radial pulsations possible sources asymmetry and likely source misinterpreted parameters through simulations. We obtained series simulated hypothetical exoplanet-star system: host star with no exhibiting small amplitude pulsations, typical hot Jupiter circular, edge-on orbit. A number scenarios various amplitudes were considered, proper account obscuring transits on all surface intensity components was made. The magnitude phase modulations nonradial during investigated. then fitted both non-gravity-darkened, gravity-darkened, free axis model data. Akaike Bayesian Information Criteria used for an objective selection most plausible model. explored dependence parameter deviations pulsation properties, order identify configurations that falsely misaligned solutions. Low-amplitude general do not affect determination system beyond their noise nature. However, frequencies close multiples orbital frequency found cause distortions leading solutions side tilted stellar rotational axis, they therefore preferable clean beforehand sake correct analysis. Additionally, cases higher-amplitude it recommended pre-process before
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2023
ISSN: ['0004-6361', '1432-0746']
DOI: https://doi.org/10.1051/0004-6361/202346078