High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP) I. Lucky imaging observations of 101 systems in the southern hemisphere

被引：40

作者：

Evans, D. F. ^{[1
]}

Southworth, J. ^{[1
]}

Maxted, P. F. L. ^{[1
]}

Skottfelt, J. ^{[2
,3
,4
]}

Hundertmark, M. ^{[3
,4
]}

Jorgensen, U. G. ^{[3
,4
]}

Dominik, M. ^{[5
]}

Alsubai, K. A. ^{[6
]}

Andersen, M. I. ^{[7
]}

Bozza, V. ^{[8
,9
]}

Bramich, D. M. ^{[6
]}

Burgdorf, M. J. ^{[10
]}

Ciceri, S. ^{[11
]}

D'Ago, G. ^{[12
]}

Jaimes, R. Figuera ^{[5
,13
]}

Gu, S. -H. ^{[14
,15
]}

Haugbolle, T. ^{[3
,4
]}

Hinse, T. C. ^{[16
]}

Juncher, D. ^{[3
,4
]}

Kains, N. ^{[17
]}

Kerins, E. ^{[18
]}

Korhonen, H. ^{[3
,4
,19
]}

Kuffmeier, M. ^{[3
,4
]}

Mancini, L. ^{[11
]}

Peixinho, N. ^{[20
,21
]}

Popovas, A. ^{[3
,4
]}

Rabus, M. ^{[11
,22
]}

Rahvar, S. ^{[23
]}

Schmidt, R. W. ^{[24
]}

Snodgrass, C. ^{[25
]}

Starkey, D. ^{[5
]}

Surdej, J. ^{[26
]}

Tronsgaard, R. ^{[27
]}

von Essen, C. ^{[27
]}

Wang, Yi-Bo ^{[14
,15
]}

Wertz, O. ^{[26
]}

机构：

[1] Keele Univ, Astrophys Grp, Keele, Staffs, England

[2] Open Univ, Dept Phys Sci, Ctr Elect Imaging, Milton Keynes MK7 6AA, Bucks, England

[3] Univ Copenhagen, Niels Bohr Inst, Oster Voldgade 5, DK-1350 Copenhagen, Denmark

[4] Univ Copenhagen, Ctr Star & Planet Format, Oster Voldgade 5, DK-1350 Copenhagen, Denmark

[5] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[6] Qatar Fdn, HBKU, Qatar Environm & Energy Res Inst QEERI, Doha, Qatar

[7] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark

[8] Univ Salerno, Dipartimento Fis ER Caianiello, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy

[9] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[10] Univ Hamburg, Meteorol Inst, Bundesstr 55, D-20146 Hamburg, Germany

[11] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[12] IIASS, Via G Pellegrino 19, I-84019 Vietri Sul Mare, SA, Italy

[13] European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[14] Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China

[15] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China

[16] Korea Astron & Space Sci Inst, 776 Daedukdae Ro, Daejeon 305348, South Korea

[17] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[18] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Oxford Rd, Manchester M13 9PL, Lancs, England

[19] Finnish Ctr Astron ESO FINCA, Vaisalantie 20, Piikkio 21500, Finland

[20] Univ Antofagasta, Fac Ciencias Basicas, Unidad Astron, Avda U Antofagasta 02800, Antofagasta, Chile

[21] Univ Coimbra, CITEUC Ctr Earth & Space Sci Res, Observ Astron Univ Coimbra, P-3030004 Coimbra, Portugal

[22] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[23] Sharif Univ Technol, Dept Phys, POB 11155, Tehran 9161, Iran

[24] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany

[25] Open Univ, Dept Phys Sci, Planetary & Space Sci, Milton Keynes MK7 6AA, Bucks, England

[26] Inst Astrophys & Geophys, Allee 6 Aout 17,Bat B5c, B-4000 Liege, Belgium

[27] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 589卷

基金：

美国国家航空航天局; 英国科学技术设施理事会; 美国国家科学基金会;

关键词：

planets and satellites: dynamical evolution and stability; planets and satellites: formation; techniques: high angular resolution; binaries: visual; SPIN-ORBIT MISALIGNMENT; MASSIVE HOT-JUPITER; HOST STARS; STELLAR COMPANIONS; ECLIPSING BINARY; VARIABLE-STARS; MAIN-SEQUENCE; WASP-SOUTH; MULTIPLICITY; SEARCH;

D O I：

10.1051/0004-6361/201527970

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 1.54m 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. 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.

引用

页数：20

共 91 条

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