Journal Article

A lucky imaging multiplicity study of exoplanet host stars

C. Ginski, M. Mugrauer, M. Seeliger and T. Eisenbeiss

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 3, pages 2498-2509
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20485.x
A lucky imaging multiplicity study of exoplanet host stars

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To understand the influence of additional wide stellar companions on planet formation, it is necessary to determine the fraction of multiple stellar systems amongst the known extrasolar planet population.

We target recently discovered radial velocity exoplanetary systems observable from the Northern hemisphere and with sufficiently high proper motion to detect stellar companions via direct imaging. We utilize the Calar Alto 2.2-m telescope in combination with its lucky imaging camera AstraLux.

71 planet host stars have been observed so far, yielding one new low-mass (0.239 ± 0.022 M) stellar companion, 4.5 arcsec (227 au of projected separation) north-east of the planet host star HD 185269, detected via astrometry with AstraLux. We also present follow-up astrometry on three previously discovered stellar companions, showing for the first time common proper motion of the 0.5-arcsec companion to HD 126614. Additionally, we determined the achieved detection limits for all targets, which allow us to characterize the detection space of possible further companions of these stars.

Keywords: techniques: high angular resolution; binaries: close; stars: individual: HD 126614; stars: individual: HD 185269

Journal Article.  7010 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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