Evidence for dynamical changes in Betelgeuse using multi-wavelength data

TL;DR

This paper provides evidence of dynamical changes in Betelgeuse's behavior before the Great Dimming event, using multi-wavelength nonlinear time series analysis to understand the star's nonlinear dynamics and early warning signals.

Contribution

It introduces additional evidence of dynamical changes in Betelgeuse prior to dimming through multi-wavelength nonlinear analysis, expanding understanding of stellar nonlinear dynamics.

Findings

Detected changes in relations between different photometric bands.

Observed alterations in early warning signals during and after dimming.

Supported the hypothesis of nonlinear dynamical behavior leading to dimming.

Abstract

The reasons behind the Great Dimming and subsequent rising in the brightness of Betelgeuse between October 2019 and March 2020 still continue to baffle astronomers. It has been shown by George et. al. (2020) that critical slowing down preceded the dimming event. This suggested that the dimming was a result of the change in the nature of the nonlinear dynamics of the star. In this work we present additional evidence for dynamical changes in Betelgeuse prior to the Great Dimming event, using nonlinear time series analysis. We study the relations between the different bands in the photometry data collected from the Wing photometry (IR/near-IR) and Wasatonic observatory (V-band). We also analyse how the early warning signals studied previously changed during and after the Great Dimming.