Constraining the Oblateness of Kepler Planets
Article
Article Title | Constraining the Oblateness of Kepler Planets |
---|---|
ERA Journal ID | 1057 |
Article Category | Article |
Authors | Zhu, Wei (Author), Huang, Chelsea X. (Author), Zhou, George (Author) and Lin, D. N. C. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 796 (1), pp. 1-18 |
Article Number | 67 |
Number of Pages | 18 |
Year | 2014 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637x/796/1/67 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/0004-637X/796/1/67 |
Abstract | We use Kepler short-cadence light curves to constrain the oblateness of planet candidates in the Kepler sample. The transits of rapidly rotating planets that are deformed in shape will lead to distortions in the ingress and egress of their light curves. We report the first tentative detection of an oblate planet outside the solar system, measuring an oblateness of for the 18 MJ mass brown dwarf Kepler 39b (KOI 423.01). We also provide constraints on the oblateness of the planets (candidates) HAT-P-7b, KOI 686.01, and KOI 197.01 to be <0.067, <0.251, and <0.186, respectively. Using the Q′ values from Jupiter and Saturn, we expect tidal synchronization for the spins of HAT-P-7b, KOI 686.01, and KOI 197.01, and for their rotational oblateness signatures to be undetectable in the current data. The potentially large oblateness of KOI 423.01 (Kepler 39b) suggests that the Q′ value of the brown dwarf needs to be two orders of magnitude larger than that of the solar system gas giants to avoid being tidally spun down. © 2014. The American Astronomical Society. |
Keywords | planetary systems; stars: individual: HAT-P-7 KOI 686 KOI 197 KOI; 423; techniques: photometric; Astrophysics - Earth and Planetary; Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Ohio State University, United States |
Princeton University, United States | |
Australian National University | |
University of California, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x81/constraining-the-oblateness-of-kepler-planets
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