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Title: CHARACTERIZING THE COOL KOIs. VI. H- AND K-BAND SPECTRA OF KEPLER M DWARF PLANET-CANDIDATE HOSTS

We present H- and K-band spectra for late-type Kepler Objects of Interest (the {sup C}ool KOIs{sup )}: low-mass stars with transiting-planet candidates discovered by NASA's Kepler Mission that are listed on the NASA Exoplanet Archive. We acquired spectra of 103 Cool KOIs and used the indices and calibrations of Rojas-Ayala et al. to determine their spectral types, stellar effective temperatures, and metallicities, significantly augmenting previously published values. We interpolate our measured effective temperatures and metallicities onto evolutionary isochrones to determine stellar masses, radii, luminosities, and distances, assuming the stars have settled onto the main sequence. As a choice of isochrones, we use a new suite of Dartmouth predictions that reliably include mid-to-late M dwarf stars. We identify five M4V stars: KOI-961 (confirmed as Kepler 42), KOI-2704, KOI-2842, KOI-4290, and the secondary component to visual binary KOI-1725, which we call KOI-1725 B. We also identify a peculiar star, KOI-3497, which has Na and Ca lines consistent with a dwarf star but CO lines consistent with a giant. Visible-wavelength adaptive optics imaging reveals two objects within a 1 arcsec diameter; however, the objects' colors are peculiar. The spectra and properties presented in this paper serve as a resource for prioritizing follow-up observationsmore » and planet validation efforts for the Cool KOIs and are all available for download online using the ''data behind the figure'' feature.« less
Authors:
 [1] ; ; ; ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8] ; ;  [9] ;  [10]
  1. Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States)
  2. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  3. Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala (Sweden)
  4. Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Oporto (Portugal)
  5. Harvard College Observatory, 60 Garden Street, Cambridge, MA 02138 (United States)
  6. Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255 (United States)
  7. Institute for Astronomy, University of Hawai'i at Mānoa, Hilo, HI 96720-2700 (United States)
  8. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  9. Department of Astronomy, Cornell University, Ithaca, NY 14583 (United States)
  10. Lowell Observatory, 1400 W Mars Hill Road, Flagstaff, AZ 86001 (United States)
Publication Date:
OSTI Identifier:
22340163
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 213; 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; ABUNDANCE; CALIBRATION; CARBON MONOXIDE; COLOR; DWARF STARS; LUMINOSITY; MASS; METALLICITY; OPTICS; PLANETS; SPECTRA; WAVELENGTHS