Unraveling the complex magnetosphere of the B star HD 133880 via wideband observation of coherent radio emission

TL;DR

This study presents wideband radio observations of the magnetic star HD 133880, revealing complex ECME characteristics influenced by the star's asymmetric magnetosphere and magnetic topology.

Contribution

First wideband observational analysis of ECME from HD 133880, linking emission properties to magnetospheric asymmetries and magnetic field deviations.

Findings

ECME pulse properties depend on stellar orientation.

Asymmetries in the magnetosphere influence emission characteristics.

Magnetic field deviations from dipolar shape affect ECME behavior.

Abstract

HD 133880 is one of the six hot magnetic stars known to produce coherent pulsed radio emission by the process of electron cyclotron maser emission (ECME). In this paper, we present observations of ECME from this star over a wide frequency range, covering nearly 300 - 4000 MHz with the Giant Metrewave Radio Telescope (GMRT) and the Karl G. Jansky Very Large Array (VLA). This study, which is the first of its kind, has led to the discovery of several interesting characteristics of the phenomenon and also of the host star. We find that the observable properties of ECME pulses, e.g. the time lag between right and left circularly polarized pulses, the amplitudes of the pulses, and their upper cut-off frequencies appear to be dependent on the stellar orientation with respect to the line of sight. We suggest that all these phenomena, which are beyond the ideal picture, can be attributed to a highly azimuthally asymmetric matter distribution in the magnetosphere about the magnetic field axis, which is a consequence of both the high obliquity (the angle between rotation axis and the magnetic field axis) of the star and the deviation of the stellar magnetic field from a dipolar topology.