Adaptive optics images of Kepler objects of interest

Adams, E. R. and Ciardi, D. R. and Dupree, A. K. and Gautier, T. N. and Kulesa, C. and McCarthy, D. (2012) Adaptive optics images of Kepler objects of interest. The Astronomical Journal, 144 (2). pp. 42-49. ISSN 0004-6256

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Abstract

All transiting planets are at risk of contamination by blends with nearby, unresolved stars. Blends dilute the transit signal, causing the planet to appear smaller than it really is, or produce a false-positive detection when the target star is blended with eclipsing binary stars. This paper reports on high spatial-resolution adaptive optics images of 90 Kepler planetary candidates. Companion stars are detected as close as 01 from the target star. Images were taken in the near-infrared (J and Ks bands) with ARIES on the MMT and PHARO on the Palomar Hale 200 inch telescope. Most objects (60%) have at least one star within 6″ separation and a magnitude difference of 9. Eighteen objects (20%) have at least one companion within 2″ of the target star; six companions (7%) are closer than 05. Most of these companions were previously unknown, and the associated planetary candidates should receive additional scrutiny. Limits are placed on the presence of additional companions for every system observed, which can be used to validate planets statistically using the BLENDER method. Validation is particularly critical for low-mass, potentially Earth-like worlds, which are not detectable with current-generation radial velocity techniques. High-resolution images are thus a crucial component of any transit follow-up program.


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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: 12 Jun 2017 08:16
Last Modified: 30 Oct 2017 01:31
Uncontrolled Keywords: binaries; instrumentation: adaptive optics; planets and satellites; detection;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-6256/144/2/42
URI: http://eprints.usq.edu.au/id/eprint/32140

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