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Title: Hubble space telescope high-resolution imaging of Kepler small and cool exoplanet host stars

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 Hubble Space Telescope 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 Kepler objects of interest, we find that there is ambiguity regarding 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 in M. We document the program detection sensitivities, detections, and deliverables to the Kepler follow-up program archive.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Astronomy and Astrophysics, and Center for Exoplanets and Habitable Worlds, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States)
  2. Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719 (United States)
  3. NASA Exoplanet Science Institute/Caltech, Pasadena, CA 91125 (United States)
  4. Astronomy Department, University of California, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
22342165
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 149; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DETECTION; DILUTION; EQUILIBRIUM; PLANETS; RESOLUTION; SENSITIVITY; SPACE; STARS; TELESCOPES