Stellar and Planetary Parameters for K2's Late-type Dwarf Systems from C1 to C5

• DOI: 10.3847/1538-4357/aa56c7
• Publication Date: 2017-03-03T20:13:36Z
• Authors: Arturo O. Martinez; Ian J. M. Crossfield; Joshua E. Schlieder; Courtney D. Dressing; Christian Obermeier; John Livingston; Simona Ciceri; Sarah Peacock; Charles A. Beichman; Sébastien Lépine; Kimberly M. Aller; Quadry A. Chance; Erik A. Petigura; Andrew W. Howard; Michael W. Werner
• Keywords: Effective temperature

The NASA K2 mission uses photometry to find planets transiting stars of various types. M dwarfs are high interest since they host more short period than any other type main sequence and around have deeper transits compared stars. In this paper, we present stellar parameters from K hosting planet candidates discovered by our team. Using the SOFI spectrograph on European Southern Observatory's New Technology Telescope, obtained R ~ 1000 J-, H-, K-band (0.95 - 2.52 microns) spectra 34 late-type candidate systems 12 bright K4-M5 with interferometrically measured radii effective temperatures. Out targets, identify 27 these as dwarfs. We measure equivalent widths spectral features, derive calibration relations using interferometric measurements, estimate radii, temperatures, masses, luminosities for hosts. Our calibrations provide temperatures median uncertainties 0.059 R_sun (16.09%) 160 (4.33%), respectively. then reassess equilibrium known based spectroscopically derived parameters. Since a planet's radius temperature depends its star, study provides precise planetary orbiting observed K2. an approximately 3R_earth 500 K, several (K2-18b K2-72e) receiving near-Earth like levels incident irradiation.