YSOVAR: Mid-infrared Variability in the Star-forming Region Lynds 1688

H. M. Günther, A. M. Cody, K. R. Covey, L. A. Hillenbrand, P. Plavchan, K. Poppenhaeger, L. M. Rebull, J. R. Stauffer, S. J. Wolk, L. Allen, A. Bayo, R. A. Gutermuth, J. L. Hora, H. Y. A. Meng, M. Morales-Calderón, J. R. Parks, Inseok Song

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Abstract

The emission from young stellar objects (YSOs) in the mid-infrared (mid-IR) is dominated by the inner rim of their circumstellar disks. We present IR data from the Young Stellar Object VARiability (YSOVAR) survey of ~800 objects in the direction of the Lynds 1688 (L1688) star-forming region over four visibility windows spanning 1.6 yr using the Spitzer Space Telescope in its warm mission phase. Among all light curves, 57 sources are cluster members identified based on their spectral energy distribution and X-ray emission. Almost all cluster members show significant variability. The amplitude of the variability is larger in more embedded YSOs. Ten out of 57 cluster members have periodic variations in the light curves with periods typically between three and seven days, but even for those sources, significant variability in addition to the periodic signal can be seen. No period is stable over 1.6 yr. Nonperiodic light curves often still show a preferred timescale of variability that is longer for more embedded sources. About half of all sources exhibit redder colors in a fainter state. This is compatible with time-variable absorption toward the YSO. The other half becomes bluer when fainter. These colors can only be explained with significant changes in the structure of the inner disk. No relation between mid-IR variability and stellar effective temperature or X-ray spectrum is found.
Original languageEnglish
Article number122
Number of pages20
JournalAstronomical Journal
Volume148
Issue number6
Early online date07 Nov 2014
DOIs
Publication statusPublished - Dec 2014

Keywords

  • accretion
  • accretion disks
  • stars: formation
  • stars: pre-main sequence
  • stars: protostars
  • stars: variables: T Tauri
  • Herbig Ae/Be

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    Günther, H. M., Cody, A. M., Covey, K. R., Hillenbrand, L. A., Plavchan, P., Poppenhaeger, K., Rebull, L. M., Stauffer, J. R., Wolk, S. J., Allen, L., Bayo, A., Gutermuth, R. A., Hora, J. L., Meng, H. Y. A., Morales-Calderón, M., Parks, J. R., & Song, I. (2014). YSOVAR: Mid-infrared Variability in the Star-forming Region Lynds 1688. Astronomical Journal, 148(6), [122]. https://doi.org/10.1088/0004-6256/148/6/122