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  • Variability of Disk Emissio...
    Pikhartova, Monika; Long, Zachary C.; Assani, Korash D.; Fernandes, Rachel B.; Bayyari, Ammar; Sitko, Michael L.; Grady, Carol A.; Wisniewski, John P.; Rich, Evan A.; Henden, Arne A.; Danchi, William C.

    The Astrophysical journal, 09/2021, Letnik: 919, Številka: 1
    Journal Article

    Abstract HD 163296 is a Herbig Ae star that underwent a dramatic ∼0.8 magnitude drop in brightness in the V photometric band in 2001 and a brightening in the near-IR in 2002. Because the star possesses Herbig–Haro objects traveling in outflowing bipolar jets, it was suggested that the drop in brightness was due to a clump of dust entrained in a disk wind, blocking the line of sight toward the star. In order to quantify this hypothesis, we investigated the brightness drop at visible wavelengths and the brightening at near-IR wavelengths of HD 163296 using the Monte Carlo Radiative Transfer Code, HOCHUNK3D . We created three models to understand the events. Model 1 describes the quiescent state of the system. Model 2 describes the change in structure that led to the drop in brightness in 2001. Model 3 describes the structure needed to produce the observed 2002 brightening of the near-IR wavelengths. Models 2 and 3 utilize a combination of a disk wind and central bipolar flow. By introducing a filled bipolar cavity in Models 2 and 3, we were able to successfully simulate a jet-like structure for the star with a disk wind and created the drop and subsequent increase in brightness of the system. On the other hand, when the bipolar cavity is not filled, Model 1 replicates the quiescent state of the system.