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Modelling a Transiting Circumbinary Disc in the HD98800 System by Faruqi, Amena; Kennedy, Grant; Nealon, Rebecca; Rowther, Sahl is a scholarly article available to read on EtoBox.

What is Modelling a Transiting Circumbinary Disc in the HD98800 System about?

We present synthetic optical light curves of the hierarchical HD98800 quadruple system over a decade-long period when the circumbinary disc encircling the system's B binary is expected to eclipse the light from the A binary. We produce and compare light curves of this transit event using hydrodynamical models with different values of the disc's gas mass, dust mass, and $\alpha$-viscosity to determine the observable effect of each parameter. These comparisons provide insight that could aid in the analysis of observational data from the system when the real transit occurs and provide recommendations for how such observations should be made. We find that a higher dust mass or higher value of $\alpha$ correspond to a longer transit, with the gas mass having a more minor effect on the overall shape and duration of the transit. A higher $\alpha$ has an observable effect on the viscous spreading at the outer edge of the disc, though is countered through truncation by the outer binary. It is also shown that long-term interactions between the outer binary and disc can excite spiral arms in the disc, which introduce observable asymmetries to the light curve. Our models suggest that the trans

Author

Faruqi, Amena; Kennedy, Grant; Nealon, Rebecca; Rowther, Sahl

Published

2025

Language

EN