The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo
© 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 amplit...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Astronomical Society
2021
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| Online Access: | https://hdl.handle.net/1721.1/134320 |
| _version_ | 1811073271901192192 |
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| 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 |
| author_facet | 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 |
| author_sort | Beatty, Thomas G |
| collection | MIT |
| description | © 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. |
| first_indexed | 2024-09-23T09:30:50Z |
| format | Article |
| id | mit-1721.1/134320 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:30:50Z |
| publishDate | 2021 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1343202021-10-28T04:44:33Z The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo 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 © 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. 2021-10-27T20:04:26Z 2021-10-27T20:04:26Z 2020 2021-09-30T12:05:56Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134320 en 10.3847/1538-3881/ABB5AA Astronomical Journal 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. application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | 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 The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo |
| title | The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo |
| title_full | The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo |
| title_fullStr | The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo |
| title_full_unstemmed | The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo |
| title_short | The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo |
| title_sort | tess phase curve of kelt 1b suggests a high dayside albedo |
| url | https://hdl.handle.net/1721.1/134320 |
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