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  High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP): II. Lucky Imaging results from 2015 and 2016

Evans, D. F., Southworth, J., Smalley, B., Jørgensen, U. G., Dominik, M., Andersen, M. I., et al. (2018). High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP): II. Lucky Imaging results from 2015 and 2016. Astronomy and Astrophysics, 610: A20. doi:10.1051/0004-6361/201731855.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-120E-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-120F-9
Genre: Journal Article

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 Creators:
Evans, D. F., Author
Southworth, J., Author
Smalley, B., Author
Jørgensen, U. G., Author
Dominik, M., Author
Andersen, M. I., Author
Bozza, V., Author
Bramich, D. M., Author
Burgdorf, M. J., Author
Ciceri, S., Author
D’Ago, G., Author
Figuera Jaimes, R. , Author
Gu, S.-H., Author
Hinse, T. C., Author
Henning, Th., Author
Hundertmark, M., Author
Kains, N., Author
Kerins, E., Author
Korhonen, H., Author
Kokotanekova, Rosita1, Author              
Kuffmeier, M., AuthorLonga-Peña, P., AuthorMancini, L., AuthorMacKenzie, J., AuthorPopovas, A., AuthorRabus, M., AuthorRahvar, S., AuthorSajadian, S., AuthorSnodgrass, C., AuthorSkottfelt, J., AuthorSurdej, J., AuthorTronsgaard, R., AuthorUnda-Sanzana, E., Authorvon Essen, C., AuthorWang, Yi-Bo, AuthorWertz, O., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: planets and satellites: dynamical evolution and stability / planets and satellites: formation / techniques: high angular resolution / binaries: visual
 Abstract: 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.

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Language(s): eng - English
 Dates: 2018-12-272018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201731855
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 610 Sequence Number: A20 Start / End Page: - Identifier: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1