A Lucky Imaging search for stellar companions to transiting planet host stars
Maria W\"ollert, Wolfgang Brandner, Carolina Bergfors, Thomas, Henning

TL;DR
This study used high-resolution Lucky Imaging to identify and characterize stellar companions around 49 transiting exoplanet host stars, assessing their impact on planetary parameter measurements and understanding system architectures.
Contribution
It provides new high-resolution imaging data for transiting planet hosts, identifying previously unresolved stellar companions and analyzing their potential influence on planetary system parameters.
Findings
Discovered new stellar companions to WASP-14 and WASP-58.
Re-observed known companions to multiple systems.
Found that some companions are likely unbound and do not significantly affect planetary parameters.
Abstract
The presence of stellar companions around planet hosting stars influences the architecture of their planetary systems. To find and characterise these companions and determine their orbits is thus an important consideration to understand planet formation and evolution. For transiting systems even unbound field stars are of interest if they are within the photometric aperture of the light curve measurement. Then they contribute a constant flux offset to the transit light curve and bias the derivation of the stellar and planetary parameters if their existence is unknown. Close stellar sources are, however, easily overlooked by common planet surveys due to their limited spatial resolution. We therefore performed high angular resolution imaging of 49 transiting exoplanet hosts to identify unresolved binaries, characterize their spectral type, and determine their separation. The observations…
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