TY - JOUR
T1 - Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey
AU - Oelkers, Ryan J.
AU - Rodriguez, Joseph E.
AU - Stassun, Keivan G.
AU - Pepper, Joshua
AU - Somers, Garrett
AU - Kafka, Stella
AU - Stevens, Daniel J.
AU - Beatty, Thomas G.
AU - Siverd, Robert J.
AU - Lund, Michael B.
AU - Kuhn, Rudolf B.
AU - James, David
AU - Gaudi, B. Scott
N1 - Publisher Copyright:
© 2017 The American Astronomical Society. All rights reserved.
PY - 2018/1
Y1 - 2018/1
N2 - The Kilodegree Extremely Little Telescope (KELT) has been surveying more than 70% of the celestial sphere for nearly a decade. While the primary science goal of the survey is the discovery of transiting, large-radii planets around bright host stars, the survey has collected more than 106 images, with a typical cadence between 10-30 minutes, for more than four million sources with apparent visual magnitudes in the approximate range . Here, we provide a catalog of 52,741 objects showing significant large-amplitude fluctuations likely caused by stellar variability, as well as 62,229 objects identified with likely stellar rotation periods. The detected variability ranges in rms-amplitude from ∼3 mmag to ∼2.3 mag, and the detected periods range from ∼0.1 to gap2000 days. We provide variability upper limits for all other ∼4,000,000 sources. These upper limits are principally a function of stellar brightness, but we achieve typical 1σ sensitivity on 30 min timescales down to ∼5 mmag at , and down to ∼43 mmag at . We have matched our catalog to the TESS Input catalog and the AAVSO Variable Star Index to precipitate the follow-up and classification of each source. The catalog is maintained as a living database on the Filtergraph visualization portal at the URL https://filtergraph.com/kelt-vars.
AB - The Kilodegree Extremely Little Telescope (KELT) has been surveying more than 70% of the celestial sphere for nearly a decade. While the primary science goal of the survey is the discovery of transiting, large-radii planets around bright host stars, the survey has collected more than 106 images, with a typical cadence between 10-30 minutes, for more than four million sources with apparent visual magnitudes in the approximate range . Here, we provide a catalog of 52,741 objects showing significant large-amplitude fluctuations likely caused by stellar variability, as well as 62,229 objects identified with likely stellar rotation periods. The detected variability ranges in rms-amplitude from ∼3 mmag to ∼2.3 mag, and the detected periods range from ∼0.1 to gap2000 days. We provide variability upper limits for all other ∼4,000,000 sources. These upper limits are principally a function of stellar brightness, but we achieve typical 1σ sensitivity on 30 min timescales down to ∼5 mmag at , and down to ∼43 mmag at . We have matched our catalog to the TESS Input catalog and the AAVSO Variable Star Index to precipitate the follow-up and classification of each source. The catalog is maintained as a living database on the Filtergraph visualization portal at the URL https://filtergraph.com/kelt-vars.
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U2 - 10.3847/1538-3881/aa9bf4
DO - 10.3847/1538-3881/aa9bf4
M3 - Article
AN - SCOPUS:85040440716
SN - 0004-6256
VL - 155
JO - Astronomical Journal
JF - Astronomical Journal
IS - 1
M1 - 39
ER -