KELT-11b: a highly inflated sub-Saturn exoplanet transiting the V=8 subgiant HD 93396

Pepper, Joshua and Rodriguez, Joseph E. and Collins, Karen A. and Johnson, John Asher and Fulton, Benjamin J. and Howard, Andrew W. and Beatty, Thomas G. and Stassun, Keivan G. and Isaacson, Howard and Colon, Knicole D. and Lund, Michael B. and Kuhn, Rudolf B. and Siverd, Robert J. and Gaudi, B. Scott and Tan, T. G. and Curtis, Ivan and Stockdale, Christopher and Mawet, Dimitri and Bottom, Michael and James, David and Zhou, George and Bayliss, Daniel and Cargile, Phillip and Bieryla, Allyson and Penev, Kaloyan and Latham, David W. and Labadie-Bartz, Jonathan and Kielkopf, John and Eastman, Jason D. and Oberst, Thomas E. and Jensen, Eric L. N. and Nelson, Peter and Sliski, David H. and Wittenmyer, Robert A. and McCrady, Nate and Wright, Jason T. and Relles, Howard M. and Stevens, Daniel J. and Joner, Michael D. and Hintz, Eric (2017) KELT-11b: a highly inflated sub-Saturn exoplanet transiting the V=8 subgiant HD 93396. The Astronomical Journal, 153 (5). ISSN 0004-6256

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 22 Nov 2017 00:01
Last Modified: 22 Nov 2017 00:01
Uncontrolled Keywords: planetary systems - planets and satellites; detection - stars; individual (KELT-11) - techniques; photometric - techniques; radial velocities
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/1538-3881/aa6572
URI: http://eprints.usq.edu.au/id/eprint/32731

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