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Stellar statistics along the ecliptic and the impact on the K2 mission concept

Published online by Cambridge University Press:  28 August 2014

Andrej Prša*
Affiliation:
Department of Astrophysics and Planetary Science, Villanova University, 800 E Lancaster Ave, Villanova, PA 19085, USA Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK
Annie Robin
Affiliation:
Institute Utinam, CNRS UMR6213, Université de Franche-Comté, OSU THETA de Franche-Comté-Bourgogne, Besançon, France
Thomas Barclay
Affiliation:
NASA Ames Research Center, M/S 244-30, Moffett Field, CA 94035, USA Bay Area Environmental Research Institute, 596 1st Street West, Sonoma CA 95476, USA

Abstract

K2 is the mission concept for a repurposed Kepler mission that uses two reaction wheels to maintain the satellite attitude and provide ~81 days of coverage for ten 105 deg2 fields along the ecliptic in the first 2.5 years of operation. We examine stellar populations based on the updated Besançon model of the Galaxy, comment on the general properties for the entire ecliptic plane, and provide stellar occurrence rates in the first six tentative K2 campaigns grouped by spectral type and luminosity class. For each campaign we distinguish between main the sequence stars and giants, and provide their density profile as a function of galactic latitude. We introduce the crowding metric that serves for optimized target selection across the campaigns. For all main sequence stars we compute the expected planetary occurrence rates for three planet sizes: 2–4, 4–8 and 8–32 R with orbital periods up to 50 days. In conjunction with Gaia and the upcoming Transiting Exoplanet Survey Satellite and Plato missions, K2 will become a gold mine for stellar and planetary astrophysics.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2014 

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