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

D. F. Evans; J. Southworth; B. Smalley; 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

doi:10.1051/0004-6361/201731855

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

D. F. Evans, J. Southworth, B. Smalley, 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. KokotanekovaM. 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

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

3 Downloads (Pure)

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 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 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.

Original language	English
Article number	A20
Number of pages	22
Journal	Astronomy & Astrophysics
Volume	610
DOIs	https://doi.org/10.1051/0004-6361/201731855
Publication status	Published - 19 Feb 2018

Keywords

Planets and sattellites: dynamical evolution and stability
Planets and satellites: formation
Techniques: high angular resolution
Binaries: visual

Access to Document

10.1051/0004-6361/201731855

Evans-2018-HITEP-A&A-AAM
© 2018, ESO. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1051/0004-6361/201731855
Accepted author manuscript, 2.33 MB

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard

Cite this

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., Jaimes, R. F., Gu, S. .-H., Hinse, T. C., Henning, T., Hundertmark, M., Kains, N., Kerins, E., Korhonen, H., ... Wertz, O. (2018). High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016. Astronomy & Astrophysics, 610, Article A20. https://doi.org/10.1051/0004-6361/201731855

@article{8565241d7e084a399b2cff92d3378d6e,

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

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 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 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.",

keywords = "Planets and sattellites: dynamical evolution and stability, Planets and satellites: formation, Techniques: high angular resolution, Binaries: visual",

author = "Evans, {D. F.} and J. Southworth and B. Smalley and J{\o}rgensen, {U. G.} and M. Dominik and Andersen, {M. I.} and V. Bozza and Bramich, {D. M.} and Burgdorf, {M. J.} and S. Ciceri and G. D'Ago and Jaimes, {R. Figuera} and Gu, {S. -H.} and Hinse, {T. C.} and Th Henning and M. Hundertmark and N. Kains and E. Kerins and H. Korhonen and R. Kokotanekova and M. Kuffmeier and P. Longa-Pe{\~n}a and L. Mancini and J. MacKenzie and A. Popovas and M. Rabus and S. Rahvar and S. Sajadian and C. Snodgrass and J. Skottfelt and J. Surdej and R. Tronsgaard and E. Unda-Sanzana and Essen, {C. von} and Yi-Bo Wang and O. Wertz",

year = "2018",

month = feb,

day = "19",

doi = "10.1051/0004-6361/201731855",

language = "English",

volume = "610",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Evans, DF, Southworth, J, Smalley, B, Jørgensen, UG, Dominik, M, Andersen, MI, Bozza, V, Bramich, DM, Burgdorf, MJ, Ciceri, S, D'Ago, G, Jaimes, RF, Gu, S-H, Hinse, TC, Henning, T, 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, Essen, CV, Wang, Y-B & Wertz, O 2018, 'High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016', Astronomy & Astrophysics, vol. 610, A20. https://doi.org/10.1051/0004-6361/201731855

TY - JOUR

T1 - High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016

AU - Evans, D. F.

AU - Southworth, J.

AU - Smalley, B.

AU - Jørgensen, U. G.

AU - Dominik, M.

AU - Andersen, M. I.

AU - Bozza, V.

AU - Bramich, D. M.

AU - Burgdorf, M. J.

AU - Ciceri, S.

AU - D'Ago, G.

AU - Jaimes, R. Figuera

AU - Gu, S. -H.

AU - Hinse, T. C.

AU - Henning, Th

AU - Hundertmark, M.

AU - Kains, N.

AU - Kerins, E.

AU - Korhonen, H.

AU - Kokotanekova, R.

AU - Kuffmeier, M.

AU - Longa-Peña, P.

AU - Mancini, L.

AU - MacKenzie, J.

AU - Popovas, A.

AU - Rabus, M.

AU - Rahvar, S.

AU - Sajadian, S.

AU - Snodgrass, C.

AU - Skottfelt, J.

AU - Surdej, J.

AU - Tronsgaard, R.

AU - Unda-Sanzana, E.

AU - Essen, C. von

AU - Wang, Yi-Bo

AU - Wertz, O.

PY - 2018/2/19

Y1 - 2018/2/19

N2 - 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 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 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.

AB - 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 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 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.

KW - Planets and sattellites: dynamical evolution and stability

KW - Planets and satellites: formation

KW - Techniques: high angular resolution

KW - Binaries: visual

U2 - 10.1051/0004-6361/201731855

DO - 10.1051/0004-6361/201731855

M3 - Article

SN - 0004-6361

VL - 610

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A20

ER -

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

Abstract

Keywords

Access to Document

Fingerprint

Projects

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

Cite this