KELT-11b: a highly inflated sub-Saturn exoplanet transiting the V=8 subgiant HD 93396
Article
Article Title | KELT-11b: a highly inflated sub-Saturn exoplanet transiting the V=8 subgiant HD 93396 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Pepper, Joshua (Author), Rodriguez, Joseph E. (Author), Collins, Karen A. (Author), Johnson, John Asher (Author), Fulton, Benjamin J. (Author), Howard, Andrew W. (Author), Beatty, Thomas G. (Author), Stassun, Keivan G. (Author), Isaacson, Howard (Author), Colon, Knicole D. (Author), Lund, Michael B. (Author), Kuhn, Rudolf B. (Author), Siverd, Robert J. (Author), Gaudi, B. Scott (Author), Tan, T. G. (Author), Curtis, Ivan (Author), Stockdale, Christopher (Author), Mawet, Dimitri (Author), Bottom, Michael (Author), James, David (Author), Zhou, George (Author), Bayliss, Daniel (Author), Cargile, Phillip (Author), Bieryla, Allyson (Author), Penev, Kaloyan (Author), Latham, David W. (Author), Labadie-Bartz, Jonathan (Author), Kielkopf, John (Author), Eastman, Jason D. (Author), Oberst, Thomas E. (Author), Jensen, Eric L. N. (Author), Nelson, Peter (Author), Sliski, David H. (Author), Wittenmyer, Robert A. (Author), McCrady, Nate (Author), Wright, Jason T. (Author), Relles, Howard M. (Author), Stevens, Daniel J. (Author), Joner, Michael D. (Author) and Hintz, Eric (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 153 (5) |
Article Number | 215 |
Number of Pages | 15 |
Year | 2017 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aa6572 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aa6572 |
Abstract | We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with Teff = 5370 ± 51K M&z.ast; = 1.438-0.052+0.061 &. R∗ =2.72 -0.21+0.17 R. log g∗ = 3.727 -0.046+0.040 and [fe/H] = 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ±0.00006 day orbit, with M P = 0.195 ±0.018 MJ RP = 1.37 0.120.15RJpP = 0.093 -0.024+0.028g cm-3, surface gravity log GP 2.407-0.086+0.080, and equilibrium temperature Teq = -46+51K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude and is the sixth brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets. |
Keywords | planetary systems - planets and satellites; detection - stars; individual (KELT-11) - techniques; photometric - techniques; radial velocities |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Lehigh University, United States |
Vanderbilt University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Hawaii, United States | |
Pennsylvania State University, United States | |
University of California, United States | |
South African Astronomical Observatory, South Africa | |
Las Cumbres Observatory, United States | |
Ohio State University, United States | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
No affiliation | |
American Association of Variable Star Observers, United States | |
California Institute of Technology (Caltech), United States | |
University of Washington, United States | |
University of Geneva, Switzerland | |
Princeton University, United States | |
School of Mathematics, Physics and Computing | |
Westminster College, United States | |
Swarthmore College, United States | |
Ellinbank Observatory, Australia | |
University of Pennsylvania, United States | |
University of New South Wales | |
University of Montana, United States | |
Brigham Young University, United States |
https://research.usq.edu.au/item/q451z/kelt-11b-a-highly-inflated-sub-saturn-exoplanet-transiting-the-v-8-subgiant-hd-93396
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