Article (Scientific journals)
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. et al.
2016In Astronomy and Astrophysics, 589
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Keywords :
Bins; Color; Extrasolar planets; Image reconstruction; Planets; Satellites; Astrometric measurements; Binaries: visuals; High-resolution imaging; Planets and satellites: dynamical evolution and stabilities; Planets and satellites: formation; Southern Hemisphere; Spectroscopic measurements; Techniques: high angular resolutions; Stars
Abstract :
[en] 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 1.54 m 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 arcsec of our sample of 101 planet host stars. 51 candidates are located within 5 arcsec 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 38-13 +17%, 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. © ESO, 2016.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Evans, D. F.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Southworth, J.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Maxted, P. F. L.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Skottfelt, J.;  Centre for Electronic Imaging, Department of Physical Sciences, Open University, Milton Keynes, United Kingdom, Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Hundertmark, M.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Jørgensen, U. G.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Dominik, M.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, United Kingdom
Alsubai, K. A.;  Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar
Andersen, M. I.;  Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen, Denmark
Bozza, V.;  Dipartimento di Fisica E.R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano, Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Bramich, D. M.;  Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar
Burgdorf, M. J.;  Meteorologisches Institut, Universität Hamburg, Bundesstraße 55, Hamburg, Germany
Ciceri, S.;  Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany
D'Ago, G.;  Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), via G. Pellegrino 19, Vietri sul Mare, SA, Italy
Figuera Jaimes, R.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, United Kingdom, European Southern Observatory, Karl-Schwarzschild Straße 2, Garching bei München, Germany
Gu, S.-H.;  Yunnan Observatories, Chinese Academy of Sciences, Kunming, China, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China
Haugbølle, T.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Hinse, T. C.;  Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon, South Korea
Juncher, D.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Kains, N.;  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, United States
Kerins, E.;  Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, United Kingdom
Korhonen, H.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark, Finnish Centre for Astronomy with ESO (FINCA), Väisäläntie 20, Piikkiö, Finland
Kuffmeier, M.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Mancini, L.;  Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany
Peixinho, N.;  Unidad de Astronomía, Fac. de Ciencias Básicas, Universidad de Antofagasta, Avda. U. de Antofagasta 02800, Antofagasta, Chile, CITEUC - Centre for Earth and Space Science Research of the University of Coimbra, Observatório Astronómico da Universidade de Coimbra, Coimbra, Portugal
Popovas, A.;  Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark
Rabus, M.;  Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany, Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
Rahvar, S.;  Department of Physics, Sharif University of Technology, PO Box 11155, Tehran, Iran
Schmidt, R. W.;  Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany
Snodgrass, C.;  Planetary and Space Sciences, Department of Physical Sciences, Open University, Milton Keynes, United Kingdom
Starkey, D.;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, United Kingdom
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Tronsgaard, R.;  Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, Denmark
Von Essen, C.;  Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, Denmark
Wang, Y.-B.;  Yunnan Observatories, Chinese Academy of Sciences, Kunming, China, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China
Wertz, O.;  Institut d'Astrophysique et de Géophysique, Allée du 6 Août 17, Sart Tilman, Bât. B5c, Liège, Belgium
More authors (26 more) Less
Language :
English
Title :
High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP): I. Lucky imaging observations of 101 systems in the southern hemisphere
Publication date :
2016
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
589
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
2014-1-400-06
NASA - National Aeronautics and Space Administration
NSF - National Science Foundation
SFTC - Science and Technology Facilities Council
Funders :
KASI - Korea Astronomy and Space Science Institute [JP]
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