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High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere

Evans, D.F.; Southworth, J.; Maxted, P.F.L.; Skottfelt, J.; Hundertmark, M.; Jørgensen, U.G.; Dominik, M.; Alsubai, K.A.; Andersen, M.I.; Bozza, V.; Bramich, D.M.; Burgdorf, M.J.; Ciceri, S.; D'Ago, G.; Figuera Jaimes, R.; Gu, S.H.; Haugbølle, T.; Hinse, T.C.; Juncher, D.; Kains, N.; Kerins, E.; Korhonen, H.; Kuffmeier, M.; Peixinho, N.; Popovas, A.; Rabus, M.; Rahvar, S.; Schmidt, R.W.; Snodgrass, C.; Starkey, D.; Surdej, J.; Tronsgaard, R.; von Essen, C.; Wang, Yi-Bo and Wertz, O. (2016). High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere. Astronomy & Astrophysics, 589, article no. A58.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201527970
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Abstract

Context. Wide binaries are a potential pathway for the formation of hot Jupiters. The binary fraction among host stars is an important discriminator between competing formation theories, but has not been well characterised. Additionally, contaminating light from unresolved stars can significantly affect the accuracy of photometric and spectroscopic measurements in studies of transiting exoplanets.
Aims. We observed 101 transiting exoplanet host systems in the Southern hemisphere in order to create a homogeneous catalogue of both bound companion stars and contaminating background stars, in an area of the sky where transiting exoplanetary systems have not been systematically searched for stellar companions. We investigate the binary fraction among the host stars in order to test theories for the formation of hot Jupiters.
Methods. Lucky imaging observations from the Two Colour Instrument on the Danish 1.54m telescope at La Silla were used to search for previously unresolved stars at small angular separations. The separations and relative magnitudes of all detected stars were measured. For 12 candidate companions to 10 host stars, previous astrometric measurements were used to evaluate how likely the companions are to be physically associated.
Results. We provide measurements of 499 candidate companions within 20 arcseconds of our sample of 101 planet host stars. 51 candidates are located within 5 arcseconds of a host star, and we provide the first published measurements for 27 of these. Calibrations for the plate scale and colour performance of the Two Colour Instrument are presented.
Conclusions. We find that the overall multiplicity rate of the host stars is $38^{+17}_{-13}\%$, consistent with the rate among solar-type stars in our sensitivity range, suggesting that planet formation does not preferentially occur in long period binaries compared to a random sample of field stars. Long period stellar companions (P > 10 yr) appear to occur independently of short period companions, and so the population of close-in stellar companions is unconstrained by our study.

Item Type: Journal Item
Copyright Holders: 2016 ESO
ISSN: 1432-0746
Keywords: planets and satellites; dynamical evolution and stability – planets and satellites; formation – techniques; high angular resolution – binaries; visual
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Space
Item ID: 45733
Depositing User: Jesper Skottfelt
Date Deposited: 08 Apr 2016 10:48
Last Modified: 05 May 2019 14:03
URI: http://oro.open.ac.uk/id/eprint/45733
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