Exoplanets & Exomoons

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

By Keith Cowing
July 8, 2014
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Hubble 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 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.

Ronald L. Gilliland, Kimberly M. Star, Elisabeth R. Adams, David R. Ciardi, Paul Kalas, Jason T. Wright (Submitted on 3 Jul 2014)

Comments: Submitted to the Astronomical Journal; 12 pages with 9 figures Subjects:

Earth and Planetary Astrophysics (astro-ph.EP)

Cite as: arXiv:1407.1009 [astro-ph.EP] (or arXiv:1407.1009v1 [astro-ph.EP] for this version)

Submission history From: Ronald Gilliland [v1] Thu, 3 Jul 2014 18:37:47 GMT (1098kb)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻