High-Resolution Imaging of Transiting Exoplanet Host Stars with AstraLux

Details High-Resolution Imaging of Transiting Exoplanet Host Stars with AstraLux High-Resolution Imaging of Transiting Exoplanet Host Stars with AstraLux

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..433d&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Computer Science

Celestial Mechanics, Extrasolar Planetary Systems, Star Formation

Scientific paper

Blending of a target star with background stars or binary companions causes several problems in transit surveys. Aside from potentially yielding false positive detections (through eclipses unrelated to the target under study), the mere presence of such blends introduces a bias in the measured baseline brightness, which leads to an under-estimation of the radius of a transiting companion. Follow-up of transiting planet candidates with state-of-the-art high-resolution methods providing diffraction-limited images from the ground can strongly mitigate this problem. We present initial results from a survey with the AstraLux Lucky Imaging camera to search for close neighbours to known exoplanet hosts. So far, three companions have been detected to transit hosts, only one of which was a previously known binary (WASP-2).

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