A lucky imaging multiplicity study of exoplanet host stars - II

astrometry; techniques: high angular resolution; planets and satellites: formation; binaries: visual; stars: individual: HD 185269; stars: individual: Kepler-21; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics

Abstract :

[en] The vast majority of extrasolar planets are detected by indirect detection methods such as transit monitoring and radial velocity measurements. While these methods are very successful in detecting short-periodic planets, they are mostly blind to wide sub-stellar or even stellar companions on long orbits. In our study, we present high- resolution imaging observations of 60 exoplanet hosts carried out with the lucky imaging instrument AstraLux at the Calar Alto 2.2 m telescope as well as with the new Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) high-resolution adaptive optics imager at the ESO/VLT in the case of a known companion of specific interest. Our goal is to study the influence of stellar multiplicity on the planet formation process. We detected and confirmed four previously unknown stellar companions to the exoplanet hosts HD 197037, HD 217786, Kepler-21 and Kepler-68. In addition, we detected 11 new low-mass stellar companion candidates which must still be confirmed as bound companions. We also provide new astrometric and photometric data points for the recently discovered very close binary systems WASP-76 and HD 2638. Furthermore, we show for the first time that the previously detected stellar companion to the HD 185269 system is a very low mass binary. Finally, we provide precise constraints on additional companions for all observed stars in our sample.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Ginski, C.; Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands ; Astrophysikalisches Institut und Universitäts-Sternwarte Jena, Schillergässchen 2, D-07745 Jena, Germany

Mugrauer, M.; Astrophysikalisches Institut und Universitäts-Sternwarte Jena, Schillergässchen 2, D-07745 Jena, Germany

Seeliger, M.; Astrophysikalisches Institut und Universitäts-Sternwarte Jena, Schillergässchen 2, D-07745 Jena, Germany

Buder, S.; Astrophysikalisches Institut und Universitäts-Sternwarte Jena, Schillergässchen 2, D-07745 Jena, Germany ; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

Errmann, R.; Astrophysikalisches Institut und Universitäts-Sternwarte Jena, Schillergässchen 2, D-07745 Jena, Germany ; Isaac Newton Group of Telescopes, Santa Cruz de La Palma, E-38700, Spain

Avenhaus, H.; Departamento de Astronomìa, Universidad de Chile, Casilla 36-D, Santiago, Chile

Mouillet, D.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France ; CNRS, IPAG, F-38000 Grenoble, France

Maire, Anne-Lise ; INAF - Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy

Raetz, S.; Scientific Support Office, Directorate of Science and Robotic Exploration, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, NL-2201 AZ Noordwijk, the Netherlands)

Language :

English

Title :

A lucky imaging multiplicity study of exoplanet host stars - II

Publication date :

01 April 2016

Journal title :

Monthly Notices of the Royal Astronomical Society

Volume :

457

Pages :

2173-2191

Peer reviewed :

Peer reviewed

Additional URL :

https://ui.adsabs.harvard.edu/abs/2016MNRAS.457.2173G

Available on ORBi :

since 21 January 2020

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