Hubble Space Telescope High Resolution Imaging of Kepler Small and Cool Exoplanet Host Stars

Abstract

High resolution imaging is an important tool for follow-up study of exoplanet candidates found via transit detection with the Kepler Mission. We discuss here HST imaging with the WFC3 of 23 stars that host particularly interesting Kepler planet candidates based on their small size and cool equilibrium temperature estimates. Results include detections, exclusion of background stars that could be a source of false positives for the transits, and detection of physically-associated companions in a number of cases providing dilution measures necessary for planet parameter refinement. For six KOIs, we find that there is ambiguity in which star hosts the transiting planet(s), with potentially strong implications for planetary characteristics. Our sample is evenly distributed in G, K, and M spectral types. Albeit with a small sample size, we find that physically-associated binaries are more common than expected at each spectral type, reaching a factor of 10 frequency excess at M. We document the program detection sensitivities, detections, and deliverables to the Kepler follow-up program archive.

arXiv commentAccepted for the Astronomical Journal; 13 pages with 9 figures

References in corpus (30)

• The Dartmouth Stellar Evolution Database
• Stellar Multiplicity
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• Kepler-16: A Transiting Circumbinary Planet
• The Occurrence Rate of Small Planets around Small Stars
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems
• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• Masses, Radii, and Orbits of Small Kepler Planets: The Transition from Gaseous to Rocky Planets
• Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
• Initial Characteristics of Kepler Long Cadence Data For Detecting Transiting Planets
• Modeling Kepler transit light curves as false positives: Rejection of blend scenarios for Kepler-9, and validation of Kepler-9d, a super-Earth-size planet in a multiple system
• On the Low False Positive Probabilities of Kepler Planet Candidates
• Validation of Kepler's Multiple Planet Candidates. II: Refined Statistical Framework and Descriptions of Systems of Special Interest
• Planetary Candidates Observed by Kepler IV: Planet Sample From Q1-Q8 (22 Months)
• Expected Detection and False Alarm Rates for Transiting Jovian Planets
• Identification of Background False Positives from Kepler Data
• Binarity of Transit Host Stars - Implications on Planetary Parameters
• Robotic Laser-Adaptive-Optics Imaging of 715 Kepler Exoplanet Candidates using Robo-AO
• High-resolution imaging of $Kepler$ planet host candidates. A comprehensive comparison of different techniques
• Adaptive Optics Images of Kepler Objects of Interest
• Kepler-10c, a 2.2-Earth radius transiting planet in a multiple system
• Adaptive Optics Images II: 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets
• Multiwavelength Observations of the Candidate Disintegrating sub-Mercury KIC 12557548b
• Accurate Low-Mass Stellar Models of KOI-126
• The Solar Neighborhood XXXI: Discovery of an Unusual Red+White Dwarf Binary at ~25 Parsecs via Astrometry and UV Imaging
• The Solar Neighborhood XXIX: The Habitable Real Estate of our Nearest Stellar Neighbors

Cited by in corpus (28)

• The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets
• Planetary Candidates Observed by Kepler. VIII. A Fully Automated Catalog With Measured Completeness and Reliability Based on Data Release 25
• The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets
• The Impact of Stellar Multiplicity on Planetary Systems, I.: The Ruinous Influence of Close Binary Companions
• The Kepler Follow-Up Observation Program. I. A Catalog of Companions to Kepler Stars from High-Resolution Imaging
• Planetary Candidates Observed by Kepler V: Planet Sample from Q1-Q12 (36 Months)
• Friends of Hot Jupiters II: No Correspondence Between Hot-Jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions
• A Catalog of Kepler Habitable Zone Exoplanet Candidates
• Validation of Twelve Small Kepler Transiting Planets in the Habitable Zone
• The Ĝ Search for Extraterrestrial Civilizations with Large Energy Supplies. IV. The Signatures and Information Content of Transiting Megastructures
• Low False-Positive Rate of Kepler Candidates Estimated From A Combination Of Spitzer And Follow-Up Observations
• Robo-AO Kepler Planetary Candidate Survey II: Adaptive Optics Imaging of 969 Kepler Exoplanet Candidate Host Stars
• Robo-AO Kepler Planetary Candidate Survey III: Adaptive Optics Imaging of 1629 Kepler Exoplanet Candidate Host Stars
• The Densities of Planets in Multiple Stellar Systems
• Influence of Stellar Multiplicity On Planet Formation. IV. Adaptive Optics Imaging of Kepler Stars With Multiple Transiting Planet Candidates
• Unresolved Binary Exoplanet Host Stars Fit as Single Stars: Effects on the Stellar Parameters
• Robo-AO Kepler Survey IV: the effect of nearby stars on 3857 planetary candidate systems
• Revision of Earth-sized Kepler Planet Candidate Properties with High Resolution Imaging by Hubble Space Telescope
• The Five Planets in the Kepler-296 Binary System All Orbit the Primary: A Statistical and Analytical Analysis
• Robo-AO Kepler Survey V: The effect of physically associated stellar companions on planetary systems
• Validation of small Kepler transiting planet candidates in or near the habitable zone
• Biases in Planet Occurrence Caused by Unresolved Binaries in Transit Surveys
• The Effects of Stellar Companions on Exoplanet Radius Distributions
• Updated Catalog of Kepler Planet Candidates: Focus on Accuracy and Orbital Periods
• Stellar Companions to the Exoplanet Host Stars HD 2638 and HD 164509
• Exclusion of Stellar Companions to Exoplanet Host Stars
• Revising Properties of Planet-host Binary Systems I.: Methods and Pilot Study
• Revising Properties of Planet-host Binary Systems II: Apparent Near-Earth Analog Planets in Binaries Are Often Sub-Neptunes