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Abstract <p>Based on the analysis of the long-term light curve of the young binary system DF Tau spanning approximately 125 years, we infer that its brightness variations are associated with changes in the accretion rate from the circumstellar protoplanetary disk onto the primary star. We have also substantially improved the orbital parameters of DF Tau, which enables us to align its secular light curve with the evolution of the binary’s component separation. The relationship between the long-term brightness variations and the orbital motion of DF Tau, if present, appears to be inconsistent with theoretical predictions. Notably, similar discrepancies between theory and observations are also seen in other young binary systems. Furthermore, the source of the polarized radiation in the optical range is found to be located at a distance of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(0\overset{\prime\prime}{.}5\)</EquationSource> <!--ASPBull2560047Burlak-m1--> </InlineEquation> from the star, with the polarization variability showing no dependence on the orbital phase.</p>

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On the Influence of Component Orbital Motion on the Photometric Variability of DF Tau

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • M. A. Burlak,
  • K. N. Grankin,
  • A. V. Dodin,
  • N. V. Emelyanov,
  • N. P. Ikonnikova,
  • Ya. A. Lazovik,
  • S. A. Lamzin,
  • B. S. Safonov,
  • I. A. Strakhov

摘要

Abstract

Based on the analysis of the long-term light curve of the young binary system DF Tau spanning approximately 125 years, we infer that its brightness variations are associated with changes in the accretion rate from the circumstellar protoplanetary disk onto the primary star. We have also substantially improved the orbital parameters of DF Tau, which enables us to align its secular light curve with the evolution of the binary’s component separation. The relationship between the long-term brightness variations and the orbital motion of DF Tau, if present, appears to be inconsistent with theoretical predictions. Notably, similar discrepancies between theory and observations are also seen in other young binary systems. Furthermore, the source of the polarized radiation in the optical range is found to be located at a distance of \(0\overset{\prime\prime}{.}5\) from the star, with the polarization variability showing no dependence on the orbital phase.