The Value-Added Catalog of ASAS-SN Eclipsing Binaries II: Properties of Extra-Physics Systems

TL;DR

This paper characterizes a subset of eclipsing binaries with additional features, such as spots, pulsations, and multiple stars, using various surveys and models to understand their properties and evolutionary states.

Contribution

It provides a detailed analysis of 'extra-physics' eclipsing binaries, identifying their features, evolutionary stages, and exotic systems using multi-survey data and stellar models.

Findings

Spotted binaries' orbital periods are divided by evolutionary state.

Identified 68 systems with X-ray detections.

Highlighted exotic systems like CVs, subdwarfs, and binaries with disks.

Abstract

Detached eclipsing binaries are the primary tool used to measure precise masses and radii of stars. In our previous paper estimating the parameters of more than 30,000 detached eclipsing binaries, we identified 766 eclipsing binaries with additional features in their All-Sky Automated Survey for Supernovae (ASAS-SN) and Transiting Exoplanet Survey Satellite (TESS) light curves. Here, we characterize these "extra-physics" systems, identifying eclipsing binaries with spotted stars, pulsating components, and candidate triple/quadruple systems. We use the Gaia, ATLAS, ZTF, and ASAS-SN variable star catalogs to consider possible blends. We use MIST isochrones and evolutionary tracks to identify systems with main sequence, subgiant, and giant primaries and highlight systems in sparsely populated regions of the color-magnitude diagram. We find that the orbital period distribution of spotted binaries is divided by evolutionary state and find 68 with X-ray detections. For the candidate triple/quadruples and pulsating systems, we calculate the extra orbital/pulsational period and identify systems with resonances. Finally, we highlight a number of exotic systems, including eclipsing CVs, subdwarfs, and binaries with disks.