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Beatty_2020_AJ_160_211.pdf
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Final Published Version
Author
Beatty, Thomas G.Wong, Ian

Fetherolf, Tara
Line, Michael R.
Shporer, Avi

Stassun, Keivan G.

Ricker, George R.
Seager, Sara
Winn, Joshua N.
Jenkins, Jon M.
Louie, Dana R.
Schlieder, Joshua E.

Sha, Lizhou
Tenenbaum, Peter
Yahalomi, Daniel A.
Affiliation
Univ Arizona, Dept Astron & Steward ObservIssue Date
2020-10-20
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IOP PUBLISHING LTDCitation
Beatty, T. G., Wong, I., Fetherolf, T., Line, M. R., Shporer, A., Stassun, K. G., ... & Yahalomi, D. A. (2020). The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo. The Astronomical Journal, 160(5), 211.Journal
ASTRONOMICAL JOURNALRights
© 2020. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We measured the optical phase curve of the transiting brown dwarf KELT-1b (TOI 1476) using data from the TESS spacecraft. We found that KELT-1b shows significant phase variation in the TESS bandpass, with a relatively large phase amplitude of 234(-44)(+43) ppm and a secondary eclipse depth of 399 +/- 19 ppm. We also measured a marginal eastward offset in the dayside hot spot of 18.degrees 3 +/- 7.degrees 4 relative to the substellar point. We detected a strong phase-curve signal attributed to ellipsoidal distortion of the host star with an amplitude of 399 19 ppm. Our results are roughly consistent with the Spitzer phase curves of KELT-1b, but the TESS eclipse depth is deeper than expected. Our cloud-free 1D models of KELT-1b's dayside emission are unable to fit the full combined eclipse spectrum. Instead, the large TESS eclipse depth suggests that KELT-1b may have a significant dayside geometric albedo of A(g) similar to 0.5 in the TESS bandpass, which would agree with the tentative trend between equilibrium temperature and geometric albedo recently suggested by Wong et al. We posit that if KELT-1b has a high dayside albedo, it is likely due to silicate clouds that form on KELT-1b's nightside and are subsequently transported onto the western side of KELT-1b's dayside hemisphere before breaking up.ISSN
0004-6256EISSN
1538-3881Version
Final published versionae974a485f413a2113503eed53cd6c53
10.3847/1538-3881/abb5aa