Variability of Kepler solar-like stars harboring small exoplanets

Howell, Steve B. and Ciardi, David R. and Giampapa, Mark S. and Everett, Mark E. and Silva, David R. and Szkody, Paula (2016) Variability of Kepler solar-like stars harboring small exoplanets. The Astronomical Journal, 151 (2). pp. 43-53. ISSN 0004-6256

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Abstract

We examine Kepler light-curve variability on habitable zone transit timescales for a large uniform sample of spectroscopically studied Kepler exoplanet host stars. The stars, taken from Everett et al., are solar-like in their properties and each harbors at least one exoplanet (or candidate) of radius ≤2.5 . The variability timescale examined is typical for habitable zone planets orbiting solar-like stars and we note that the discovery of the smallest exoplanets (≤1.2 ) with corresponding transit depths of less than ∼0.18 mmag occur for the brightest and photometrically quietest stars. Thus, these detections are quite rare in Kepler observations. Some brighter and more evolved stars (subgiants), the latter of which often show large radial velocity jitter, are found to be among the photometrically quietest solar-like stars in our sample and the most likely small planet transit hunting grounds. The Sun is discussed as a solar-like star proxy to provide insight into the nature and cause of photometric variability. It is shown that Kepler's broad, visible light observations are insensitive to variability caused by chromospheric activity that may be present in the observed stars.


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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: 31 May 2017 07:25
Last Modified: 30 Oct 2017 01:23
Uncontrolled Keywords: planetary systems; stars: fundamental parameters; surveys
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: 10.3847/0004-6256/151/2/43
URI: http://eprints.usq.edu.au/id/eprint/32096

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