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Probing long-period companions to planetary hosts. VLT and CFHT near infrared coronographic imaging surveys
Aims.We present the results of a deep imaging survey of stars surroundedby planets detected with the radial velocity technique. The purpose isto search for and to characterize long-period stellar and substellarcompanions. The sample contains a total of 26 stars, among which 6exhibit additional radial velocity drifts. Methods: .We usedNACO, at the ESO Very Large Telescope, and PUEO-KIR, at the CandianFrench Hawaiian Telescope, to conduct a near-infrared coronographicsurvey with adaptive optics of the faint circumstellar environment ofthe planetary hosts. The domain investigated ranges between 0.1'' to15'' (i.e. about 3 to 500 AU, according to the mean distance of thesample). The survey is sensitive to companions within the stellar andthe substellar domains, depending on the distance to the central starsand on the star properties. Results: .The images of 14 stars donot reveal any companions once the field objects are removed. 8 starshave close potential companions that need to be re-observed within 1-2years to check for physical companionship. 4 stars are surrounded byfaint objects which are confirmed or very probable companions. Thecompanion to HD 13445 (Gl 86) is already known. The HD 196885 star is anew close visual binary system with a high probability of being bound.The 2 newly discovered companions, HD 1237 B and HD 27442 B, sharecommon proper motions with the central stars. Orbital motion is detectedfor HD 1237 B. HD 1237 B is likely a low-mass M star, located at 70 AU(projected distance) from the primary. HD 27442 B is most probably awhite dwarf companion located at about 240 AU (projected distance).
| II-Listes et classifications d'étoiles M, S, C, trouvées dans divers champs pris aux prismes objectifs à vision directe
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