Probing the Deep End of the Milky Way with New Oscillating <i>Kepler</i> Giants

Mathur, S.; García, R. A.; Huber, Daniel; Régulo, C.; Stello, Dennis; Beck, P. G.; Houmani, K.; Salabert, D.

doi:10.1051/epjconf/201716005001

Cited by 1 publication

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“…While the EPIC uses Galaxia models for stellar parameter inference, the classifications are based on observational data such as reduced proper motions, col-ors, and spectroscopy, hence providing a more empirical test of the completeness of the seismic sample. Based on simulations and comparisons to the Kepler Stellar Properties Catalog (Huber et al 2014;Mathur et al 2016), the dwarf/giant misclassification fraction in the EPIC is expected to be ∼ 5%.…”

Section: Comparison To Epic Classificationsmentioning

confidence: 99%

“…With this program we aim to measure convectively-driven, or solar-like, oscillations in tens of thousands of red giants using the high-precision photometry from K2. The asteroseismic imprint in the data combined with ground-based measurements of effective temperature and metallicity will allow us to infer stellar properties such as radius and mass, and hence distance and age, even for stars out to a few tens of kilo parsec (Mathur et al 2016). This in turn will enable us to probe the structure and evolution of vast regions of the Galaxy not probed before by asteroseismic means (e.g.…”

Section: Introductionmentioning

confidence: 97%

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The K2 Galactic Archaeology Program Data Release I: Asteroseismic Results From Campaign 1

Stello

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Elsworth

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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 the sample is at least near complete for stars with 40 ν max /µHz 270, and ν max,detect < 2.6 × 10 6 · 2 −Kp µHz. There is a detection bias against helium core burning stars with ν max ∼ 30 µHz, affecting the number of measurements of ∆ν and possibly also ν max . Although we can detect oscillations down to Kp = 15, our campaign 1 sample lacks enough faint giants to assess the detection completeness for stars fainter than Kp ∼ 14.5.

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Section: Comparison To Epic Classificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%