High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP)

I. Lucky imaging observations of 101 systems in the southern hemisphere

D. F. Evans, J. Southworth, P. F L Maxted, J. Skottfelt, M. Hundertmark, U. G. Jørgensen, M. Dominik, Khalid Al-Subai, M. I. Andersen, V. Bozza, D. M. Bramich, M. J. Burgdorf, S. Ciceri, G. D'Ago, R. Figuera Jaimes, S. H. Gu, T. Haugbølle, T. C. Hinse, D. Juncher, N. Kains & 16 others E. Kerins, H. Korhonen, M. Kuffmeier, L. Mancini, N. Peixinho, A. Popovas, M. Rabus, S. Rahvar, R. W. Schmidt, C. Snodgrass, D. Starkey, J. Surdej, R. Tronsgaard, C. Von Essen, Yi Bo Wang, O. Wertz

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberA58
JournalAstronomy and Astrophysics
Volume589
DOIs
Publication statusPublished - 1 May 2016

Fingerprint

planetary systems
Southern Hemisphere
stars
high resolution
Jupiter
planet
extrasolar planets
Jupiter (planet)
color
planets
companion stars
discriminators
star distribution
calibration
catalogs
sky
telescopes

Keywords

  • binaries: visual
  • planets and satellites: dynamical evolution and stability
  • planets and satellites: formation
  • techniques: high angular resolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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; Skottfelt, J.; Hundertmark, M.; Jørgensen, U. G.; Dominik, M.; Al-Subai, Khalid; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M. J.; Ciceri, S.; D'Ago, G.; Figuera Jaimes, R.; Gu, S. H.; Haugbølle, T.; Hinse, T. C.; Juncher, D.; Kains, N.; Kerins, E.; Korhonen, H.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Rahvar, S.; Schmidt, R. W.; Snodgrass, C.; Starkey, D.; Surdej, J.; Tronsgaard, R.; Von Essen, C.; Wang, Yi Bo; Wertz, O.

In: Astronomy and Astrophysics, Vol. 589, A58, 01.05.2016.

Research output: Contribution to journalArticle

Evans, DF, Southworth, J, Maxted, PFL, Skottfelt, J, Hundertmark, M, Jørgensen, UG, Dominik, M, Al-Subai, K, Andersen, MI, Bozza, V, Bramich, DM, Burgdorf, MJ, Ciceri, S, D'Ago, G, Figuera Jaimes, R, Gu, SH, Haugbølle, T, Hinse, TC, Juncher, D, Kains, N, Kerins, E, Korhonen, H, Kuffmeier, M, Mancini, L, Peixinho, N, Popovas, A, Rabus, M, Rahvar, S, Schmidt, RW, Snodgrass, C, Starkey, D, Surdej, J, Tronsgaard, R, Von Essen, C, Wang, YB & Wertz, O 2016, 'High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP): I. Lucky imaging observations of 101 systems in the southern hemisphere', Astronomy and Astrophysics, vol. 589, A58. https://doi.org/10.1051/0004-6361/201527970
Evans, D. F. ; Southworth, J. ; Maxted, P. F L ; Skottfelt, J. ; Hundertmark, M. ; Jørgensen, U. G. ; Dominik, M. ; Al-Subai, Khalid ; Andersen, M. I. ; Bozza, V. ; Bramich, D. M. ; Burgdorf, M. J. ; Ciceri, S. ; D'Ago, G. ; Figuera Jaimes, R. ; Gu, S. H. ; Haugbølle, T. ; Hinse, T. C. ; Juncher, D. ; Kains, N. ; Kerins, E. ; Korhonen, H. ; Kuffmeier, M. ; Mancini, L. ; Peixinho, N. ; Popovas, A. ; Rabus, M. ; Rahvar, S. ; Schmidt, R. W. ; Snodgrass, C. ; Starkey, D. ; Surdej, J. ; Tronsgaard, R. ; Von Essen, C. ; Wang, Yi Bo ; Wertz, O. / High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP) : I. Lucky imaging observations of 101 systems in the southern hemisphere. In: Astronomy and Astrophysics. 2016 ; Vol. 589.
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title = "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP): I. Lucky imaging observations of 101 systems in the southern hemisphere",
abstract = "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.",
keywords = "binaries: visual, planets and satellites: dynamical evolution and stability, planets and satellites: formation, techniques: high angular resolution",
author = "Evans, {D. F.} and J. Southworth and Maxted, {P. F L} and J. Skottfelt and M. Hundertmark and J{\o}rgensen, {U. G.} and M. Dominik and Khalid Al-Subai and Andersen, {M. I.} and V. Bozza and Bramich, {D. M.} and Burgdorf, {M. J.} and S. Ciceri and G. D'Ago and {Figuera Jaimes}, R. and Gu, {S. H.} and T. Haugb{\o}lle and Hinse, {T. C.} and D. Juncher and N. Kains and E. Kerins and H. Korhonen and M. Kuffmeier and L. Mancini and N. Peixinho and A. Popovas and M. Rabus and S. Rahvar and Schmidt, {R. W.} and C. Snodgrass and D. Starkey and J. Surdej and R. Tronsgaard and {Von Essen}, C. and Wang, {Yi Bo} and O. Wertz",
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TY - JOUR

T1 - High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP)

T2 - I. Lucky imaging observations of 101 systems in the southern hemisphere

AU - Evans, D. F.

AU - Southworth, J.

AU - Maxted, P. F L

AU - Skottfelt, J.

AU - Hundertmark, M.

AU - Jørgensen, U. G.

AU - Dominik, M.

AU - Al-Subai, Khalid

AU - Andersen, M. I.

AU - Bozza, V.

AU - Bramich, D. M.

AU - Burgdorf, M. J.

AU - Ciceri, S.

AU - D'Ago, G.

AU - Figuera Jaimes, R.

AU - Gu, S. H.

AU - Haugbølle, T.

AU - Hinse, T. C.

AU - Juncher, D.

AU - Kains, N.

AU - Kerins, E.

AU - Korhonen, H.

AU - Kuffmeier, M.

AU - Mancini, L.

AU - Peixinho, N.

AU - Popovas, A.

AU - Rabus, M.

AU - Rahvar, S.

AU - Schmidt, R. W.

AU - Snodgrass, C.

AU - Starkey, D.

AU - Surdej, J.

AU - Tronsgaard, R.

AU - Von Essen, C.

AU - Wang, Yi Bo

AU - Wertz, O.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - 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.

AB - 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.

KW - binaries: visual

KW - planets and satellites: dynamical evolution and stability

KW - planets and satellites: formation

KW - techniques: high angular resolution

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DO - 10.1051/0004-6361/201527970

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