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1 results

  • Mid-infrared Variability and Accretion in NGC 2264 Protostars

  • S. Terebey, A. M. Cody, L. M. Rebull, J. R. Stauffer
  • Journal:
    Proceedings of the International Astronomical Union / Volume 10 / Issue S314 / November 2015
    Published online by Cambridge University Press:
    27 January 2016, pp. 209-210
    Print publication:
    November 2015
    • Article
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  • Variable mass accretion is thought to be an important aspect of protostar formation. Mid-infrared wavelength observations trace variations in accretion luminosity and thus can probe mass accretion on sub-AU scales. We present results from the Spitzer YSOVAR campaign towards Class I protostars in NGC 2264. The precise (0.02 mag) medium-cadence light curves at 3.6 and 4.5 microns show that young star variability is ubiquitous, with a variety of morphologies and time scales. A structure function analysis shows the light curves, on average, have a power-law behavior up to 30 days. The trend continues to longer timescales (years) for protostars (Class I), in contrast with the smaller brightness changes displayed by T Tauri stars (Class II). The power-law behavior suggests a stochastic process, such as turbulent mass accretion, drives the variability.