K2 Discovery of a Circumsecondary Disk Transiting EPIC 220208795
L. van der Kamp, D.M. van Dam, M.A. Kenworthy, E.E. Mamajek, G., Pojma\'nski

TL;DR
This paper reports the discovery and modeling of a circumsecondary disk around a star, explaining a deep eclipse with detailed physical and orbital parameters, and suggesting a possible common origin for similar systems.
Contribution
It introduces a novel model of a tilted, inclined opaque disk around a companion star causing eclipses, with detailed parameter estimation and implications for orbital eccentricity.
Findings
Disk radius approximately 1.14 solar radii
Eccentricity around 0.7 for the orbit
Predicted eclipse epochs for future observations
Abstract
Observations of the star EPIC 220208795 (2MASS J01105556+0018507) reveal a single, deep and asymmetric eclipse, which we hypothesize is due to an eclipsing companion surrounded by a tilted and inclined opaque disk, similar to those seen around V928 Tau and EPIC 204376071. We aim to derive physical parameters of the disk and orbital parameters for the companion around the primary star. The modeling is carried out using a modified version of the python package pyPplusS, and optimization is done using emcee. The period analysis makes use of photometry from ground-based surveys, where we perform a period folding search for other possible eclipses by the disk. Parameters obtained by the best model fits are used to obtain the parameter space of the orbital parameters, while the most likely period obtained is used to constrain these parameters. The best model has an opaque disk with a radius…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation
