Kepler-408 is one of the 33 planet-hosting Kepler stars for which asteroseismology has been used to investigate the orientation of the stellar rotation axis relative to the planetary orbital plane. The transiting hot Earth, Kepler-408b, has an orbital period of 2.5 days and a radius of 0.86 R ⊕ , making it much smaller than the planets for which spin–orbit alignment has been studied using the Rossiter–McLaughlin effect. Because conflicting asteroseismic results have been reported in the literature, we undertake a thorough re-appraisal of this system and perform numerous checks for consistency and robustness. We find that the conflicting results are due to the different models for the low-frequency noise in the power spectrum. A careful treatment of the background noise resolves these conflicts, and shows that the stellar inclination is degrees. Kepler-408b is, by far, the smallest planet known to have a significantly misaligned orbit.
CITATION STYLE
Kamiaka 上赤, S. 翔也, Benomar, O., Suto 須, Y. 藤靖, Dai 戴, F. 飛, Masuda 増田, K. 賢人, & Winn, J. N. (2019). The Misaligned Orbit of the Earth-sized Planet Kepler-408b. The Astronomical Journal, 157(4), 137. https://doi.org/10.3847/1538-3881/ab04a9
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