Issue |
A&A
Volume 610, February 2018
|
|
---|---|---|
Article Number | A20 | |
Number of page(s) | 22 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201731855 | |
Published online | 19 February 2018 |
High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP)
II. Lucky Imaging results from 2015 and 2016★,★★
1
Astrophysics Group, Keele University,
Staffordshire,
ST5 5BG, UK
e-mail: d.f.evans@keele.ac.uk
2
Niels Bohr Institute & Centre for Star and Planet Formation, University of Copenhagen Øster Voldgade 5,
1350
Copenhagen, Denmark
3
Centre for Exoplanet Science, SUPA School of Physics & Astronomy, University of St Andrews,
North Haugh,
St Andrews,
KY16 9SS, UK
4
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen,
Juliane Maries Vej 30,
2100
Copenhagen Ø, Denmark
5
Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno,
via Giovanni Paolo II 132,
84084
Fisciano, Italy
6
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli,
80126
Napoli, Italy
7
Universitamburg, Faculty of Mathematics, Informatics and Natural Sciences, Department of Earth Sciences, Meteorological Institute,
Bundesstra 55,
20146
Hamburg, Germany
8
Max Planck Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg, Germany
9
INAF–Osservatorio Astronomico di Capodimonte,
Salita Moiariello 16,
80131
Napoli, Italy
10
European Southern Observatory,
Karl-Schwarzschild Straße 2,
85748
Garching bei München, Germany
11
Yunnan Observatories, Chinese Academy of Sciences,
Kunming
650011, PR China
12
Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences,
Kunming
650011, PR China
13
Korea Astronomy & Space Science Institute,
776 Daedukdae-ro, Yuseong-gu,
Daejeon
305-348, Republic of Korea
14
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg,
Mönchhofstr. 12-14,
69120
Heidelberg, Germany
15
Space Telescope Science Institute,
3700 San Martin Drive,
Baltimore,
MD
21218, USA
16
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester,
Oxford Road,
Manchester
M13 9PL, UK
17
Finnish Centre for Astronomy with ESO (FINCA),
Väisäläntie 20,
21500
Piikkiö, Finland
18
Max Planck Institute for Solar System Research,
Justus-von-Liebig-Weg 3,
37077
Göttingen, Germany
19
School of Physical Sciences, Faculty of Science, Technology, Engineering and Mathematics, The Open University,
Walton Hall,
Milton Keynes,
MK7 6AA, UK
20
Unidad de Astronomía, Fac. de Ciencias Básicas, Universidad de Antofagasta,
Avda. U. de Antofagasta,
02800 Antofagasta, Chile
21
Department of Physics, University of Rome Tor Vergata,
via della Ricerca Scientifica 1,
00133
Roma, Italy
22
INAF – Astrophysical Observatory of Turin,
via Osservatorio 20,
10025
Pino Torinese, Italy
23
Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile,
Av. Vicuña Mackenna 4860,
7820436
Macul,
Santiago, Chile
24
Department of Physics, Sharif University of Technology,
PO Box 11155-9161
Tehran, Iran
25
Department of Physics, Isfahan University of Technology,
84156-83111
Isfahan, Iran
26
Institut d’Astrophysique et de Géophysique,
Allée du 6 Août 19c, Sart Tilman, Bât. B5c,
4000
Liège, Belgium
27
Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University,
Ny Munkegade 120,
8000
Aarhus C, Denmark
28
Argelander-Institut für Astronomie,
Auf dem Hgel, 71,
53121
Bonn, Germany
Received:
29
August
2017
Accepted:
21
September
2017
Context. The formation and dynamical history of hot Jupiters is currently debated, with wide stellar binaries having been suggested as a potential formation pathway. Additionally, contaminating light from both binary companions and unassociated stars can significantly bias the results of planet characterisation studies, but can be corrected for if the properties of the contaminating star are known.
Aim. We search for binary companions to known transiting exoplanet host stars, in order to determine the multiplicity properties of hot Jupiter host stars. We also search for and characterise unassociated stars along the line of sight, allowing photometric and spectroscopic observations of the planetary system to be corrected for contaminating light.
Methods. We analyse lucky imaging observations of 97 Southern hemisphere exoplanet host stars, using the Two Colour Instrument on the Danish 1.54 m telescope. For each detected companion star, we determine flux ratios relative to the planet host star in two passbands, and measure the relative position of the companion. The probability of each companion being physically associated was determined using our two-colour photometry.
Results. A catalogue of close companion stars is presented, including flux ratios, position measurements, and estimated companion star temperature. For companions that are potential binary companions, we review archival and catalogue data for further evidence. For WASP-77AB and WASP-85AB, we combine our data with historical measurements to determine the binary orbits, showing them to be moderately eccentric and inclined to the line of sight (and hence planetary orbital axis). Combining our survey with the similar Friends of Hot Jupiters survey, we conclude that known hot Jupiter host stars show a deficit of high mass stellar companions compared to the field star population; however, this may be a result of the biases in detection and target selection by ground-based surveys.
Key words: planets and satellites: dynamical evolution and stability / planets and satellites: formation / techniques: high angular resolution / binaries: visual
Based on data collected by the MiNDSTEp consortium using the Danish 1.54 m telescope at the ESO La Silla observatory.
Full Tables 2–4, 9, and 10 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/610/A20
© ESO, 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.