Stellar & Planetary Parameters for K 2 ’ S Late Type Dwarf Systems from C 1 to C 5

Content Provider	Semantic Scholar
Author	Martinez, Arturo O. Crossfield, Ian J. M. Schlieder, Joshua E. Dressing, Courtney D. Obermeier, Christian Livingston, John Ciceri, Simona Peacock, Sarah Beichman, Charles A. Lépine, Sébastien Aller, Kimberly M. Chance, Quadry A. Petigura, Erik A. Howard, Andrew W. Werner, Michael W.
Copyright Year	2017
Abstract	The NASA K2 mission uses photometry to find planets transiting stars of various types. M dwarfs are of high interest since they host more short-period planets than any other type of main-sequence star and transiting planets around M dwarfs have deeper transits compared to other main-sequence stars. In this paper, we present stellar parameters from K and M dwarfs hosting transiting planet candidates discovered by our team. Using the SOFI spectrograph on the European Southern Observatory’s New Technology Telescope, we obtained R≈1000J-, H-, and K-band (0.95–2.52 μm) spectra of 34 late-type K2 planet and candidate planet host systems and 12 bright K4– M5 dwarfs with interferometrically measured radii and effective temperatures. Out of our 34 late-type K2 targets, we identify 27 of these stars as M dwarfs. We measure equivalent widths of spectral features, derive calibration relations using stars with interferometric measurements, and estimate stellar radii, effective temperatures, masses, and luminosities for the K2 planet hosts. Our calibrations provide radii and temperatures with median uncertainties of 0.059 Re (16.09%) and 160 K (4.33%), respectively. We then reassess the radii and equilibrium temperatures of known and candidate planets based on our spectroscopically derived stellar parameters. Since a planet’s radius and equilibrium temperature depend on the parameters of its host star, our study provides more precise planetary parameters for planets and candidates orbiting late-type stars observed with K2. We find a median planet radius and an equilibrium temperature of approximately 3R⊕ and 500 K, respectively, with several systems (K2-18b and K2-72e) receiving near-Earth-like levels of incident irradiation.
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Alternate Webpage(s)	http://authors.library.caltech.edu/74798/1/Martinez_2017_ApJ_837_72.pdf
Alternate Webpage(s)	http://authors.library.caltech.edu/74798/2/1701.00588.pdf
Language	English
Access Restriction	Open
Subject Keyword	ABRA gene Bone structure of radius Calibration DWARF Equilibrium GUCY2C protein, human Photometry Planetary scanner Stars, Celestial Stellar (payment network) Stellar classification Super-resolution optical fluctuation imaging The K2 Viral Interleukin-6 Homolog
Content Type	Text
Resource Type	Article