A Lucky Imaging search for stellar companions to transiting planet host stars
arXiv:1507.01938 · doi:10.1051/0004-6361/201424091
Abstract
The presence of stellar companions around planet hosting stars influences the architecture of their planetary systems. To find and characterise these companions and determine their orbits is thus an important consideration to understand planet formation and evolution. For transiting systems even unbound field stars are of interest if they are within the photometric aperture of the light curve measurement. Then they contribute a constant flux offset to the transit light curve and bias the derivation of the stellar and planetary parameters if their existence is unknown. Close stellar sources are, however, easily overlooked by common planet surveys due to their limited spatial resolution. We therefore performed high angular resolution imaging of 49 transiting exoplanet hosts to identify unresolved binaries, characterize their spectral type, and determine their separation. The observations were carried out with the Calar Alto 2.2m telescope using the Lucky Imaging camera AstraLux Norte. All targets were imaged in i' and z' passbands. We found new companion candidates to WASP-14 and WASP-58, and we re-observed the stellar companion candidates to CoRoT-2, CoRoT-3, CoRoT-11, HAT-P-7, HAT-P-8, HAT-P-41, KIC 10905746, TrES-2, TrES-4, and WASP-2. We deduce from the stellar density around all sources that two companion candidates out of the targets with the first position measurement (CoRoT-11, HAT-P-41, KIC 10905746, WASP-14 and WASP-58) are probably unbound. In addition, we re-analyse the influence of the sources close to WASP-14 and WASP-58 on the planetary parameters given in the literature and find no significant changes.
References in corpus (30)
- Shrinking binary and planetary orbits by Kozai cycles with tidal friction
- On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve
- Homogeneous studies of transiting extrasolar planets. IV. Thirty systems with space-based light curves
- Hot Jupiters from Secular Planet--Planet Interactions
- Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
- The Stellar Populations of Praesepe and Coma Berenices
- WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE
- Transiting exoplanets from the CoRoT space mission II. CoRoT-Exo-2b: A transiting planet around an active G star
- Transiting exoplanets from the CoRoT space mission VI. CoRoT-Exo-3b: The first secure inhabitant of the brown-dwarf desert
- The effects of fly-bys on planetary systems
- Planetary System Disruption by Galactic Perturbations to Wide Binary Stars
- Steady-state planet migration by the Kozai-Lidov mechanism in stellar binaries
- Binarity of Transit Host Stars - Implications on Planetary Parameters
- Re-Evaluating WASP-12b: Strong Emission at 2.315 micron, Deeper Occultations, and an Isothermal Atmosphere
- HAT-P-39b--HAT-P-41b: Three Highly Inflated Transiting Hot Jupiters
- Planet Hunters: The First Two Planet Candidates Identified by the Public using the Kepler Public Archive Data
- WASP-52b, WASP-58b, WASP-59b, and WASP-60b: four new transiting close-in giant planets
- Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts
- Adaptive Optics Images of Kepler Objects of Interest
- Binarity as a key factor in protoplanetary disk evolution: Spitzer disk census of the eta Chamaeleontis cluster
- Multiplicity in transiting planet host stars. A Lucky Imaging study of Kepler candidates
- WASP-14b: 7.3 Mj transiting planet in an eccentric orbit
- Adaptive Optics Images II: 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets
- WASP-12b and HAT-P-8b are Members of Triple Star Systems
- Transiting exoplanets from the CoRoT space mission XIV. CoRoT-11b: a transiting massive "hot-Jupiter" in a prograde orbit around a rapidly rotating F-type star
- A Common Proper Motion Stellar Companion to HAT-P-7
- AstraLux - the Calar Alto 2.2-m telescope Lucky Imaging camera
- Lucky Imaging of transiting planet host stars with LuckyCam
- Search for Outer Massive Bodies around Transiting Planetary Systems: Candidates of Faint Stellar Companions around HAT-P-7
- The young binary HD 102077: Orbit, spectral type, kinematics, and moving group membership
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- WASP-47: A Hot Jupiter System with Two Additional Planets Discovered by K2
- Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migration
- Statistical Characterization of Hot Jupiter Atmospheres using Spitzer's Secondary Eclipses
- A Lucky Imaging search for stellar sources near 74 transit hosts
- A high binary fraction for the most massive close-in giant planets and brown dwarf desert members
- DREAM I. Orbital architecture orrery
- Friends of Hot Jupiters III: An Infrared Spectroscopic Search for Low-Mass Stellar Companions
- High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere
- A lucky imaging multiplicity study of exoplanet host stars II
- A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE
- WASP-120b, WASP-122b and WASP-123b: Three newly discovered planets from the WASP-South survey
- Absolute densities, masses, and radii of the WASP-47 system determined dynamically
- Discovery and Validation of a High-Density sub-Neptune from the K2 Mission
- Spin-Orbit Misalignments of Three Jovian Planets via Doppler Tomography
- No difference in orbital parameters of RV-detected giant planets between 0.1 and 5 au in single vs multi-stellar systems
- High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016
- The GAPS Programme at TNG: XXXVI. Measurement of the Rossiter-McLaughlin effect and revising the physical and orbital parameters of the HAT-P-15, HAT-P-17, HAT-P-21, HAT-P-26, HAT-P-29 eccentric planetary systems
- Emergent Spectral Fluxes of Hot Jupiters: an Abrupt Rise in Day Side Brightness Temperature Under Strong Irradiation
- Featureless transmission spectra of 12 giant exoplanets observed by GTC/OSIRIS
- Homogeneous Transit Timing Analyses of Ten Exoplanet Systems
- Multiplicity of stars with planets in the solar neighbourhood
- Multi-epoch, high spatial resolution observations of multiple T Tauri systems
- Physical properties and optical-infrared transmission spectrum of the giant planet XO-1b
- K2, Spitzer, and TESS Transits of Four Sub-Neptune Exoplanets