A search for Keplerian periods in the brightness variations of T Tauri and Ae Herbig stars |
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Authors: | S A Artemenko K N Grankin P P Petrov |
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Institution: | 1.Crimean Astrophysical Observatory,Nauchnyi, Crimea,Ukraine |
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Abstract: | Long-term, uniform series of U BV R observations of T Tauri and Ae Herbig stars obtained over 20 yr at the Maidanak Observatory as part of the ROTOR program
are analyzed. We find a linear relationship between the characteristic variability time scale and the bolometric luminosity
of the star+disk system: the higher the luminosity, the slower the brightness variations. This dependence is valid over a
wide range of masses and luminosities, from T Tauri stars to Ae Herbig stars. On average, the variability time scale is one-quarter
the Keplerian period at the dust-sublimation radius, which is known from interferometric observations. Some T Tauri stars
have periods from 25 to 120 days, which are preserved over several observing seasons. These periods correspond to Keplerian
orbits with semi-major axes from 0.14 to 0.52 AU. The results obtained provide indirect evidence for the existence of protoplanets
in the gas-dust disks of stars in early stages of their evolution toward the main sequence. |
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