Asteroseismology of Solar-Type Stars withK2: Detection of Oscillations in C1 Data

Abstract

We present the first detections by the NASA K2 Mission of oscillations in solar-type stars, using short-cadence data collected during K2 Campaign 1 (C1). We understand the asteroseismic detection thresholds for C1-like levels of photometric performance, and we can detect oscillations in subgiants having dominant oscillation frequencies around 1000 µHz. Changes to the operation of the fine-guidance sensors are expected to give significant improvements in the high-frequency performance from C3 onwards. A reduction in the excess highfrequency noise by a factor of two-and-a-half in amplitude would bring mainsequence stars with dominant oscillation frequencies as high as ≃ 2500 µHz into play as potential asteroseismic targets for K2.

The Updated BaSTI Stellar Evolution Models and Isochrones. I. Solar-scaled Calculations

“…Asteroseismology has experienced a revolution thanks to past and present space missions such as CoRoT (Baglin et al 2009), Kepler (Gilliland et al 2010), and K2 (Chaplin et al 2015), which have provided high-precision photometric data for hundreds of main-sequence and subgiant stars and for thousands of red giants.…”

The K2 Galactic Caps Project – going beyond the Kepler field and ageing the Galactic disc

“…Re-purposed as K2, asteroseismic observations to-wards the Galactic poles extend substantively beyond 1.5 kpc, facilitating the first detailed examination of the vertical Galactic structure with asteroseismology. Though degraded in comparison to Kepler, the K2 data remains of high enough quality to make precise asteroseismic inferences (see Chaplin et al 2015;Stello et al 2015;Miglio et al 2016). Hence, using K2 campaigns 3 and 6, we present an asteroseismic analysis of the vertical disc structure of the Milky Way with the K2 Galactic Caps Project (K2 GCP).…”

Weighing in on the masses of retired A stars with asteroseismology: K2 observations of the exoplanet-host star HD 212771

“…Asteroseismology with the repurposed NASA K2 mission (e.g., Chaplin et al 2015;Stello et al 2015;Lund et al 2016a,b;Miglio et al 2016) -successively targeting different fields along the ecliptic plane -therefore has the potential to shed new light on the retired A star con-troversy by providing accurate and precise masses for a number of bright, subgiant and low-luminosity red-giant host stars previously targeted by Doppler surveys. Herein, we address this issue by presenting the first 1 asteroseismic characterisation of a known exoplanet-host star using K2 photometry, deferring an ensemble study to a future publication (T. S. H. North et al, in prep.).…”