THE K2 GALACTIC ARCHAEOLOGY PROGRAM DATA RELEASE I: ASTEROSEISMIC RESULTS FROM CAMPAIGN 1

NASA's K2 mission is observing tens of thousands of stars along the ecliptic, providing data suitable for large-scale asteroseismic analyses to inform galactic archaeology studies. Its first campaign covered a field near the north Galactic cap, a region never covered before by large asteroseism...

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Published in:	The Astrophysical journal 2017-01, Vol.835 (1), p.83
Main Authors:	Stello, Dennis, Zinn, Joel, Elsworth, Yvonne, Garcia, Rafael A., Kallinger, Thomas, Mathur, Savita, Mosser, Benoit, Sharma, Sanjib, Chaplin, William J., Davies, Guy, Huber, Daniel, Jones, Caitlin D., Miglio, Andrea, Aguirre, Victor Silva
Format:	Article
Language:	eng
Subjects:	Archaeology Astronomical models Astrophysics ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPARATIVE EVALUATIONS Completeness COMPUTERIZED SIMULATION DETECTION Extrasolar planets GALAXIES Galaxy: general HELIUM Maximum power Measurement methods Milky Way OSCILLATIONS Physics planetary systems Seismic properties STARS stars: fundamental parameters stars: interiors stars: oscillations (including pulsations) SYNTHESIS
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Summary:	NASA's K2 mission is observing tens of thousands of stars along the ecliptic, providing data suitable for large-scale asteroseismic analyses to inform galactic archaeology studies. Its first campaign covered a field near the north Galactic cap, a region never covered before by large asteroseismic-ensemble investigations, and was therefore of particular interest for exploring this part of our Galaxy. Here we report the asteroseismic analysis of all stars selected by the K2 Galactic Archaeology Program during the mission's "north Galactic cap" campaign 1. Our consolidated analysis uses six independent methods to measure the global seismic properties, in particular the large frequency separation and the frequency of maximum power. From the full target sample of 8630 stars we find about 1200 oscillating red giants, a number comparable with estimates from galactic synthesis modeling. Thus, as a valuable by-product we find roughly 7500 stars to be dwarfs, which provide a sample well suited for galactic exoplanet occurrence studies because they originate from our simple and easily reproducible selection function. In addition, to facilitate the full potential of the data set for galactic archaeology, we assess the detection completeness of our sample of oscillating red giants. We find that the sample is at least nearly complete for stars with / Hz and Hz. There is a detection bias against helium core burning stars with Hz, affecting the number of measurements of and possibly also . Although we can detect oscillations down to , our campaign 1 sample lacks enough faint giants to assess the detection completeness for stars fainter than .
ISSN:	0004-637X 1538-4357