Identification of young stellar variables with KELT for K2-II. The Upper Scorpius association

Megan Ansdell, Ryan J. Oelkers, Joseph E. Rodriguez, Eric Gaidos, Garrett Somers, Eric Mamajek, Phillip A. Cargile, Keivan G. Stassun, Joshua Pepper, Daniel J. Stevens, Thomas G. Beatty, Robert J. Siverd, Michael B. Lund, Rudolf B. Kuhn, David James, B. Scott Gaudi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

High-precision photometry from space-based missions such as K2 and Transiting Exoplanet Survey Satellite enables detailed studies of young star variability. However, because spacebased observing campaigns are often short (e.g. 80 d for K2), complementary long-baseline photometric surveys are critical for obtaining a complete understanding of young star variability, which can change on time-scales of minutes to years. We therefore present and analyse light curves of members of the Upper Scorpius association made over 5.5 yr by the groundbased Kilodegree Extremely Little Telescope (KELT), which complement the high-precision observations of this region taken by K2 during its Campaigns 2 and 15. We show that KELT data accurately identify the periodic signals found with high-precision K2 photometry, demonstrating the power of ground-based surveys in deriving stellar rotation periods of young stars. We also use KELT data to identify sources exhibiting variability that is likely related to circumstellar material and/or stellar activity cycles; these signatures are often unseen in the short-term K2 data, illustrating the importance of long-term monitoring surveys for studying the full range of young star variability. We provide the KELT light curves as electronic tables in an ongoing effort to establish legacy time series data sets for young stellar clusters.

Original languageEnglish (US)
Pages (from-to)1231-1243
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number1
DOIs
StatePublished - Jan 1 2018

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telescopes
stars
light curve
photometry
stellar activity
stellar rotation
baseline survey
extrasolar planets
complement
signatures
young
time series
timescale
electronics
monitoring

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ansdell, M., Oelkers, R. J., Rodriguez, J. E., Gaidos, E., Somers, G., Mamajek, E., ... Scott Gaudi, B. (2018). Identification of young stellar variables with KELT for K2-II. The Upper Scorpius association. Monthly Notices of the Royal Astronomical Society, 473(1), 1231-1243. https://doi.org/10.1093/MNRAS/STX2293
Ansdell, Megan ; Oelkers, Ryan J. ; Rodriguez, Joseph E. ; Gaidos, Eric ; Somers, Garrett ; Mamajek, Eric ; Cargile, Phillip A. ; Stassun, Keivan G. ; Pepper, Joshua ; Stevens, Daniel J. ; Beatty, Thomas G. ; Siverd, Robert J. ; Lund, Michael B. ; Kuhn, Rudolf B. ; James, David ; Scott Gaudi, B. / Identification of young stellar variables with KELT for K2-II. The Upper Scorpius association. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 473, No. 1. pp. 1231-1243.
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abstract = "High-precision photometry from space-based missions such as K2 and Transiting Exoplanet Survey Satellite enables detailed studies of young star variability. However, because spacebased observing campaigns are often short (e.g. 80 d for K2), complementary long-baseline photometric surveys are critical for obtaining a complete understanding of young star variability, which can change on time-scales of minutes to years. We therefore present and analyse light curves of members of the Upper Scorpius association made over 5.5 yr by the groundbased Kilodegree Extremely Little Telescope (KELT), which complement the high-precision observations of this region taken by K2 during its Campaigns 2 and 15. We show that KELT data accurately identify the periodic signals found with high-precision K2 photometry, demonstrating the power of ground-based surveys in deriving stellar rotation periods of young stars. We also use KELT data to identify sources exhibiting variability that is likely related to circumstellar material and/or stellar activity cycles; these signatures are often unseen in the short-term K2 data, illustrating the importance of long-term monitoring surveys for studying the full range of young star variability. We provide the KELT light curves as electronic tables in an ongoing effort to establish legacy time series data sets for young stellar clusters.",
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Ansdell, M, Oelkers, RJ, Rodriguez, JE, Gaidos, E, Somers, G, Mamajek, E, Cargile, PA, Stassun, KG, Pepper, J, Stevens, DJ, Beatty, TG, Siverd, RJ, Lund, MB, Kuhn, RB, James, D & Scott Gaudi, B 2018, 'Identification of young stellar variables with KELT for K2-II. The Upper Scorpius association', Monthly Notices of the Royal Astronomical Society, vol. 473, no. 1, pp. 1231-1243. https://doi.org/10.1093/MNRAS/STX2293

Identification of young stellar variables with KELT for K2-II. The Upper Scorpius association. / Ansdell, Megan; Oelkers, Ryan J.; Rodriguez, Joseph E.; Gaidos, Eric; Somers, Garrett; Mamajek, Eric; Cargile, Phillip A.; Stassun, Keivan G.; Pepper, Joshua; Stevens, Daniel J.; Beatty, Thomas G.; Siverd, Robert J.; Lund, Michael B.; Kuhn, Rudolf B.; James, David; Scott Gaudi, B.

In: Monthly Notices of the Royal Astronomical Society, Vol. 473, No. 1, 01.01.2018, p. 1231-1243.

Research output: Contribution to journalArticle

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T1 - Identification of young stellar variables with KELT for K2-II. The Upper Scorpius association

AU - Ansdell, Megan

AU - Oelkers, Ryan J.

AU - Rodriguez, Joseph E.

AU - Gaidos, Eric

AU - Somers, Garrett

AU - Mamajek, Eric

AU - Cargile, Phillip A.

AU - Stassun, Keivan G.

AU - Pepper, Joshua

AU - Stevens, Daniel J.

AU - Beatty, Thomas G.

AU - Siverd, Robert J.

AU - Lund, Michael B.

AU - Kuhn, Rudolf B.

AU - James, David

AU - Scott Gaudi, B.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - High-precision photometry from space-based missions such as K2 and Transiting Exoplanet Survey Satellite enables detailed studies of young star variability. However, because spacebased observing campaigns are often short (e.g. 80 d for K2), complementary long-baseline photometric surveys are critical for obtaining a complete understanding of young star variability, which can change on time-scales of minutes to years. We therefore present and analyse light curves of members of the Upper Scorpius association made over 5.5 yr by the groundbased Kilodegree Extremely Little Telescope (KELT), which complement the high-precision observations of this region taken by K2 during its Campaigns 2 and 15. We show that KELT data accurately identify the periodic signals found with high-precision K2 photometry, demonstrating the power of ground-based surveys in deriving stellar rotation periods of young stars. We also use KELT data to identify sources exhibiting variability that is likely related to circumstellar material and/or stellar activity cycles; these signatures are often unseen in the short-term K2 data, illustrating the importance of long-term monitoring surveys for studying the full range of young star variability. We provide the KELT light curves as electronic tables in an ongoing effort to establish legacy time series data sets for young stellar clusters.

AB - High-precision photometry from space-based missions such as K2 and Transiting Exoplanet Survey Satellite enables detailed studies of young star variability. However, because spacebased observing campaigns are often short (e.g. 80 d for K2), complementary long-baseline photometric surveys are critical for obtaining a complete understanding of young star variability, which can change on time-scales of minutes to years. We therefore present and analyse light curves of members of the Upper Scorpius association made over 5.5 yr by the groundbased Kilodegree Extremely Little Telescope (KELT), which complement the high-precision observations of this region taken by K2 during its Campaigns 2 and 15. We show that KELT data accurately identify the periodic signals found with high-precision K2 photometry, demonstrating the power of ground-based surveys in deriving stellar rotation periods of young stars. We also use KELT data to identify sources exhibiting variability that is likely related to circumstellar material and/or stellar activity cycles; these signatures are often unseen in the short-term K2 data, illustrating the importance of long-term monitoring surveys for studying the full range of young star variability. We provide the KELT light curves as electronic tables in an ongoing effort to establish legacy time series data sets for young stellar clusters.

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