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 journalArticlepeer-review

16 Scopus citations

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
Externally publishedYes

Bibliographical note

Funding Information:
Early work on KELT-North was supported by NASA Grant NNG04GO70G. JER was supported by the Harvard Future Faculty Leaders Postdoctoral fellowship. GS acknowledges the support of the Vanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics fellowship. This work has made use of NASA's Astrophysics Data System and the SIMBAD data base operated at CDS, Strasbourg, France. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. This document does not contain export controlled information and is under review for Unlimited External Release (URS268385). Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

Funding Information:
Early work on KELT-North was supported by NASA Grant NNG04GO70G. JER was supported by the Harvard Future Faculty Leaders Postdoctoral fellowship. GS acknowledges the support of the Vanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics fellowship. This work has made use of NASA’s Astrophysics Data System and the SIMBAD data base operated at CDS, Strasbourg, France. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. This document does not contain export controlled information and is under review for Unlimited External Release (URS268385). Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

Publisher Copyright:
© 2018 The Author(s).

Keywords

  • Herbig Ae/Be
  • Stars: pre-main sequence
  • Stars: variables: T Tauri

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