K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0

By David J Armstrong, J. Kirk, K. Lam, J. McCormac, S. Walker, D. Brown, H. Osborn, D. Pollacco, J. Spake. 2015

77 citations recorded by the source corpus.

We have created a catalogue of variable stars found from a search of the publicly available K2 mission data from Campaigns 1 and 0. This catalogue provides the identifiers of 8395 variable stars, including 199 candidate eclipsing binaries with periods up to 60d and 3871 periodic or quasi-periodic objects, with periods up to 20d for Campaign 1 and 15d for Campaign 0. Lightcurves are extracted and detrended from the available data. These are searched using a combination of algorithmic and human classification, leading to a classifier for each object as an eclipsing binary, sinusoidal periodic, quasi periodic, or aperiodic variable. The source of the variability is not identified, but could arise in the non-eclipsing binary cases from pulsation or stellar activity. Each object is cross-matched against variable star related guest observer proposals to the K2 mission, which specifies the variable type in some cases. The detrended lightcurves are also compared to lightcurves currently publicly available. The resulting catalogue is made available online via the MAST archive at this https URL, and gives the ID, type, period, semi-amplitude and range of the variation seen. We also make available the detrended lightcurves for each object.

Subfields: Astronomy and Astrophysics, Computational Mechanics, Instrumentation

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Citations in the corpus

STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 17 PLANETS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION (2015, background): “The exception, K2-19, is a two-planet system with the two planets near a 3:2 period commensurability, so in this case the “secondary” is actually the transits of the other planet.”
A SYSTEMATIC SEARCH FOR TRANSITING PLANETS IN THE K2 DATA (2015, methodology): “There are other methods specifically tuned to find EBs in K2 (such as Armstrong et al. 2014, 2015) and these catalogs contain our full sample of EBs and more.”
One of the closest exoplanet pairs to the 3:2 mean motion resonance: K2-19b and c (2015, methodology): “Initially a fixed aperture, of radius 4 pixels in this case and shape as described in Armstrong et al. (2015), was centred on the brightest target pixel.”
EVEREST: PIXEL LEVEL DECORRELATION OF K2 LIGHT CURVES (2016, methodology): “Similar methods are employed in the K2VARCAT pipeline (Armstrong et al. 2015), developed specifically for variable K2 stars, the K2P2 pipeline (Lund et al. 2015), which uses an intelligent clustering algorithm to define custom apertures, and in the pipeline of Huang et al. (2015), which employs…”
PLANETARY CANDIDATES FROM THE FIRST YEAR OF THE K2 MISSION (2015, background): “Armstrong et al. (2015b) and Foreman-Mackey et al. (2015) previously identified two transiting giant planet candidates around EPIC 201505350, close to a 3:2 mean motion resonance, and Armstrong et al. (2015b) confirmed their planetary nature by detecting transit timing variations.”
THE K2 ECLIPTIC PLANE INPUT CATALOG (EPIC) AND STELLAR CLASSIFICATIONS OF 138,600 TARGETS IN CAMPAIGNS 1–8 (2015, background): “…around bright GKM dwarfs (Crossfield et al. 2015; Vanderburg et al. 2015; Foreman-Mackey et al. 2015; Petigura et al. 2015), eclipsing binary stars (Armstrong et al. 2015; LaCourse et al. 2015), as well as the detection of pulsations across the HR diagram such as subgiants (Chaplin et al. 2015),…”