Characterizing the cool kepler objects of interests. new effective temperatures, metallicities, masses, and radii of low-mass kepler planet-candidate host stars

Philip S. Muirhead, Katherine Hamren, Everett Schlawin, Bárbara Rojas-Ayala, Kevin R. Covey, James P. Lloyd

Resultado de la investigación: Article

99 Citas (Scopus)

Resumen

We report stellar parameters for late-K and M-type planet-candidate host stars announced by the Kepler Mission. We obtained medium-resolution, K-band spectra of 84 cool (T eff ≲ 4400K) Kepler Objects of Interest (KOIs) from Borucki et al. We identified one object as a giant (KOI 977); for the remaining dwarfs, we measured effective temperatures (T eff) and metallicities [M/H] using the K-band spectral indices of Rojas-Ayala et al. We determine the masses (M *) and radii (R *) of the cool KOIs by interpolation onto the Dartmouth evolutionary isochrones. The resultant stellar radii are significantly less than the values reported in the Kepler Input Catalog and, by construction, correlate better with T eff. Applying the published KOI transit parameters to our stellar radius measurements, we report new physical radii for the planet candidates. Recalculating the equilibrium temperatures of the planet-candidates assuming Earth's albedo and re-radiation fraction, we find that three of the planet-candidates are terrestrial sized with orbital semimajor axes that lie within the habitable zones of their host stars (KOI 463.01, KOI 812.03, and KOI 854.01). The stellar parameters presented in this Letter serve as a resource for prioritization of future follow-up efforts to validate and characterize the cool KOI planet candidates.

Idioma originalEnglish
Número de artículoL37
PublicaciónAstrophysical Journal Letters
Volumen750
N.º2
DOI
EstadoPublished - 10 may 2012

Huella dactilar

metallicity
planets
planet
stars
radii
extremely high frequencies
temperature
Earth albedo
Kepler mission
prioritization
transit
catalogs
interpolation
albedo
resources
orbitals
radiation
resource
parameter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Muirhead, Philip S. ; Hamren, Katherine ; Schlawin, Everett ; Rojas-Ayala, Bárbara ; Covey, Kevin R. ; Lloyd, James P. / Characterizing the cool kepler objects of interests. new effective temperatures, metallicities, masses, and radii of low-mass kepler planet-candidate host stars. En: Astrophysical Journal Letters. 2012 ; Vol. 750, N.º 2.
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Characterizing the cool kepler objects of interests. new effective temperatures, metallicities, masses, and radii of low-mass kepler planet-candidate host stars. / Muirhead, Philip S.; Hamren, Katherine; Schlawin, Everett; Rojas-Ayala, Bárbara; Covey, Kevin R.; Lloyd, James P.

En: Astrophysical Journal Letters, Vol. 750, N.º 2, L37, 10.05.2012.

Resultado de la investigación: Article

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AU - Hamren, Katherine

AU - Schlawin, Everett

AU - Rojas-Ayala, Bárbara

AU - Covey, Kevin R.

AU - Lloyd, James P.

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AB - We report stellar parameters for late-K and M-type planet-candidate host stars announced by the Kepler Mission. We obtained medium-resolution, K-band spectra of 84 cool (T eff ≲ 4400K) Kepler Objects of Interest (KOIs) from Borucki et al. We identified one object as a giant (KOI 977); for the remaining dwarfs, we measured effective temperatures (T eff) and metallicities [M/H] using the K-band spectral indices of Rojas-Ayala et al. We determine the masses (M *) and radii (R *) of the cool KOIs by interpolation onto the Dartmouth evolutionary isochrones. The resultant stellar radii are significantly less than the values reported in the Kepler Input Catalog and, by construction, correlate better with T eff. Applying the published KOI transit parameters to our stellar radius measurements, we report new physical radii for the planet candidates. Recalculating the equilibrium temperatures of the planet-candidates assuming Earth's albedo and re-radiation fraction, we find that three of the planet-candidates are terrestrial sized with orbital semimajor axes that lie within the habitable zones of their host stars (KOI 463.01, KOI 812.03, and KOI 854.01). The stellar parameters presented in this Letter serve as a resource for prioritization of future follow-up efforts to validate and characterize the cool KOI planet candidates.

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