Most sub-arcsecond companions of Kepler exoplanet candidate host stars are gravitationally bound

Horch, Elliott P. and Howell, Steve B. and Everett, Mark E. and Ciardi, David R. (2014) Most sub-arcsecond companions of Kepler exoplanet candidate host stars are gravitationally bound. The Astrophysical Journal, 795 (1). pp. 60-69. ISSN 0004-637X

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Abstract

Using the known detection limits for high-resolution imaging observations and the statistical properties of true binary and line-of-sight companions, we estimate the binary fraction of Kepler exoplanet host stars. Our speckle imaging programs at the WIYN 3.5 m and Gemini North 8.1 m telescopes have observed over 600 Kepler objects of interest and detected 49 stellar companions within 1 arcsec. Assuming binary stars follow a log-normal period distribution for an effective temperature range of 3000-10,000 K, then the model predicts that the vast majority of detected sub-arcsecond companions are long period (P > 50 yr), gravitationally bound companions. In comparing the model predictions to the number of real detections in both observational programs, we conclude that the overall binary fraction of host stars is similar to the 40%-50% rate observed for field 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: 02 Jun 2017 05:56
Last Modified: 27 Jun 2017 00:54
Uncontrolled Keywords: Binaries: visual; Planetary systems; Stars: solar-type; Techniques: high angular resolution; Techniques: interferometric; 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/795/1/60
URI: http://eprints.usq.edu.au/id/eprint/32114

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