This is not the latest version of this item. The latest version can be found here.
The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo
Name
Beatty_2020_AJ_160_211.pdf
Description
Published version
Size
2.6 MB
Format
Adobe PDF
Checksum (MD5)
c33d005d8b32b558f34e592d5bc34333
Author(s)
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
Date Issued
2020
Journal
Astronomical Journal
Publisher
American Astronomical Society
Version
Final published version
Abstract
© 2020. The American Astronomical Society. All rights reserved. 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 371-49+47 ppm. We also measured a marginal eastward offset in the dayside hot spot of 18.°3 ± 7.°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 ∼ 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.
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
10.3847/1538-3881/ABB5AA
