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J/A+A/589/A58      High-resolution imaging of TEP systems (HITEP) (Evans+, 2016)

High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere. Evans D.F., Southworth H., Maxted P.F.L., Skottfelt J., Hundertmark M., Jorgensen U.G., Dominik M., Alsubai K.A., Andersen M.I., Bozza V., Bramich D.M., Burgdorf M.J., Ciceri S., D'Ago G., Figuera Jaimes R., Gu S.H., Haugbolle T., Hinse T.C., Juncher D., Kains N., Kerins E., Korhonen H., Kuffmeier M., Peixinho N., Popovas A., Rabus M., Rahvar S., Schmidt R.W., Snodgrass C., Starkey D., Surdej J., Tronsgaard R., von Essen C., Wang Y.B., Wertz O. <Astron. Astrophys. 589, A58 (2016)> =2016A&A...589A..58E (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Positional data ; Photometry Keywords: planets and satellites: dynamical evolution and stability - planets and satellites: formation - techniques: high angular resolution - binaries: visual Abstract: 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. 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. Lucky imaging observations from the Two Colour Instrument on the Danish 1.54m 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. We provide measurements of 499 candidate companions within 20 arcseconds of our sample of 101 planet host stars. 51 candidates are located within 5 arcseconds 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. We find that the overall multiplicity rate of the host stars is 38+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>10yr) appear to occur independently of short period companions, and so the population of close-in stellar companions is unconstrained by our study. Description: Table 1 contains the summary of observations undertaken in this work, listing each observation, the target, and exposure time in one (red) or two (red and visible) cameras. Table 4 contains a set of distances derived to the exoplanet host stars, using the K-band calibration of Kervella et al. (2004A&A...426..297K). Table 8 gives the raw measurements of each detected companion on each observation, which include observing date, separation and position angle, and magnitude relative to the exoplanet host star in one (red) or two (red and visible) cameras. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 32 279 Summary of observations of TEP host stars for 101 stars table4.dat 24 70 Derived K-band distances to TEP host stars table8.dat 83 1507 Measured properties of all candidate companions
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Target name 13- 24 F12.4 d BJD Barycentric Julian Date 26- 28 I3 s ExpRed Exposure time with red camera 30- 32 I3 s ExpVis ? Exposure time with visible camera
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Target name 13- 18 F6.1 pc Dist Distance to system 20- 24 F5.1 pc e_Dist Error in distance
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Target name 14- 15 I2 --- CompID ID of the candidate companion 17- 22 F6.3 arcsec Sep Separation between target and companion 24- 28 F5.3 arcsec e_Sep Error in separation 30- 34 F5.1 deg PA Position angle of companion, measured from N 36- 38 F3.1 deg e_PA Error in position angle 40- 47 F8.4 mag redmag Brightness in red relative to TEP host 49- 54 F6.4 mag e_redmag Error in red brightness 56- 63 F8.4 mag vismag ? Brightness in visual relative to TEP host 65- 70 F6.4 mag e_vismag ? Error in visual brightness 72- 83 F12.4 d BJD Barycentric Julian Date
Acknowledgements: Daniel Evans, d.f.evans(at)
(End) Daniel Evans [Keele University], Patricia Vannier [CDS] 09-Mar-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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