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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.; Bozza, V.; Bramich, D.M.; Burgdorf, M.J.; Ciceri, S.; D’Ago, G.; Figuera Jaimes, R.; Gu, S.-H.; Hinse, T.C.; Henning, Th.; Hundertmark, M.; Kains, N.; Kerins, E.; Korhonen, H.; Kokotanekova, R.; Kuffmeier, M.; Longa-Peña, P.; Mancini, L.; MacKenzie, J.; Popovas, A.; Rabus, M.; Rahvar, S.; Sajadian, S.; Snodgrass, C.; Skottfelt, J.; Surdej, J.; Tronsgaard, R.; Unda-Sanzana, E.; von Essen, C.; Wang, Yi-Bo; Wertz, O.

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


Authors

D.F. Evans

U.G. Jørgensen

M. Dominik

M.I. Andersen

V. Bozza

D.M. Bramich

M.J. Burgdorf

S. Ciceri

G. D’Ago

R. Figuera Jaimes

S.-H. Gu

T.C. Hinse

Th. Henning

M. Hundertmark

N. Kains

E. Kerins

H. Korhonen

R. Kokotanekova

M. Kuffmeier

P. Longa-Peña

L. Mancini

J. MacKenzie

A. Popovas

M. Rabus

S. Rahvar

S. Sajadian

C. Snodgrass

J. Skottfelt

J. Surdej

R. Tronsgaard

E. Unda-Sanzana

C. von Essen

Yi-Bo Wang

O. Wertz



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.
Aims.
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 1.54m 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.

Citation

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

Journal Article Type Article
Acceptance Date Sep 21, 2017
Online Publication Date Feb 19, 2018
Publication Date 2018-02
Publicly Available Date May 26, 2023
Journal Astronomy and Astrophysics
Print ISSN 2329-1273
Publisher Hans Publishers
Peer Reviewed Peer Reviewed
Volume 610
Article Number A20
DOI https://doi.org/10.1051/0004-6361/201731855
Keywords planets and satellites, dynamical evolution and stability, formation, techniques, high angular resolution, binaries, visual
Publisher URL http://doi.org/10.1051/0004-6361/201731855

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