Journal
ASTROPHYSICAL JOURNAL
Volume 809, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/809/1/25
Keywords
catalogs; planetary systems; planets and satellites: detection; stars: fundamental parameters
Categories
Funding
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX13AC07G]
- NASA Science Mission directorate
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- National Science Foundation Graduate Research Fellowship [DGE-1144469]
- David and Lucile Packard Foundation
- National Science Foundation [IIS-1124794]
- National Aeronautics and Space Administration [NNX12AI50G, NNX14AE11G]
- Moore-Sloan Data Science Environment at NYU
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- Direct For Computer & Info Scie & Enginr
- Div Of Information & Intelligent Systems [1124794] Funding Source: National Science Foundation
Ask authors/readers for more resources
The extended Kepler mission, K2, is now providing photometry of new fields every three months in a search for transiting planets. In a recent study, Foreman-Mackey and collaborators presented a list of 36 planet candidates orbiting 31 stars in K2 Campaign 1. In this contribution, we present stellar and planetary properties for all systems. We combine ground-based seeing-limited survey data and adaptive optics imaging with an automated transit analysis scheme to validate 21 candidates as planets, 17 for the first time, and identify 6 candidates as likely false positives. Of particular interest is K2-18 (EPIC 201912552), a bright (K = 8.9) M2.8 dwarf hosting a 2.23 +/- 0.25 R-circle plus planet with T-eq = 272 +/- 15 K and an orbital period of 33 days. We also present two new open-source software packages which enable this analysis. The first, isochrones, is a flexible tool for fitting theoretical stellar models to observational data to determine stellar properties using a nested sampling scheme to capture the multimodal nature of the posterior distributions of the physical parameters of stars that may plausibly be evolved. The second is vespa, a new general-purpose procedure to calculate false positive probabilities and statistically validate transiting exoplanets.
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