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 "Cool KOIs"): 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 observations and planet validation efforts for the Cool KOIs and are all available for download online using the "data behind the figure" feature.

Becker, JulietteCalifornia Institute of Technology (författare)
Feiden, Gregory,1986-Uppsala universitet,Teoretisk astrofysik(Swepub:uu)grefe950 (författare)
Rojas-Ayala, BárbaraCentro de Astrofisica da Universidade do Porto (författare)
Vanderburg, AndrewHarvard College Observatory (författare)
Price, EllenCalifornia Institute of Technology (författare)
Thorp, RachelCalifornia Institute of Technology (författare)
Law, NicholasUniversity of North Carolina at Chapel Hill (författare)
Riddle, ReedCalifornia Institute of Technology (författare)
Baranec, ChristophUniversity of Hawai'i (författare)
Hamren, KatherineUniversity of California Santa Cruz (författare)
Schlawin, EverettCornell University (författare)
Covey, KevinLowell Observatory (författare)
Johnson, John AsherHarvard College Observatory (författare)
Lloyd, JamesCornell University (författare)
Boston UniversityCalifornia Institute of Technology (creator_code:org_t)

Ingår i:Astrophysical Journal Supplement Series: American Astronomical Society213:1, s. 5-0067-00491538-4365

Av författaren/redakt...: Muirhead, Philip; Becker, Juliette; Feiden, Gregory, ...; Rojas-Ayala, Bár ...; Vanderburg, Andr ...; Price, Ellen; visa fler...; Thorp, Rachel; Law, Nicholas; Riddle, Reed; Baranec, Christo ...; Hamren, Katherin ...; Schlawin, Everet ...; Covey, Kevin; Johnson, John As ...; Lloyd, James; visa färre...

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