Revision of earth-sized Kepler planet candidate properties with high-resolution imaging by the Hubble space telescope

Cartier, Kimberly M. S. and Gilliland, Ronald L. and Wright, Jason T. and Ciardi, David R. (2015) Revision of earth-sized Kepler planet candidate properties with high-resolution imaging by the Hubble space telescope. The Astrophysical Journal, 804 (2). pp. 97-112. ISSN 0004-637X

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Abstract

We present the results of our Hubble Space Telescope program and describe how our analysis methods were used to re-evaluate the habitability of some of the most interesting Kepler planet candidates. Our program observed 22 Kepler Object of Interest (KOI) host stars, several of which were found to be multiple star systems unresolved by Kepler. We use our high-resolution imaging to spatially resolve the stellar multiplicity of Kepler-296, KOI-2626, and KOI-3049, and develop a conversion to the Kepler photometry (Kp) from the F555W and F775W filters on WFC3/UVIS. The binary system Kepler-296 (five planets) has a projected separation of 0.″217 (80 AU); KOI-2626 (one planet candidate) is a triple star system with a projected separation of 0.″201 (70 AU) between the primary and secondary components and 0.″161 (55 AU) between the primary and tertiary; and the binary system KOI-3049 (one planet candidate) has a projected separation of 0.″464 (225 AU). We use our measured photometry to fit the separated stellar components to the latest Victoria-Regina Stellar Models with synthetic photometry to conclude that the systems are coeval. The components of the three systems range from mid-K dwarf to mid-M dwarf spectral types.We solved for the planetary properties of each system analytically and via an MCMC algorithm using our independent stellar parameters. The planets range from ∼1.6 to 4.2 R⊕ mostly Super Earths and mini-Neptunes. As a result of the stellar multiplicity, some planets previously in the Habitable Zone are, in fact, not, and other planets may be habitable depending on their assumed stellar host.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 02 Jun 2017 04:52
Last Modified: 27 Jun 2017 00:27
Uncontrolled Keywords: planetary systems; stars: fundamental parameters; stars: individual (KIC 6263593, KIC 11497958, KIC 11768142); techniques: photometric;
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: 10.1088/0004-637X/804/2/97
URI: http://eprints.usq.edu.au/id/eprint/32106

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