Unusual periodic modulation in the radio emission of the methane dwarf binary WISEP J101905.63+652954.2
Timothy W. H. Yiu, Harish K. Vedantham, Joseph R. Callingham, Timothy W. Shimwell

TL;DR
This study reports the discovery of an unusual periodic modulation in the radio emission of the methane dwarf binary WISEP J101905.63+652954.2, revealing complex magnetospheric phenomena and a second periodic signature that may originate from the binary components.
Contribution
The paper presents long-term LOFAR observations of a methane dwarf binary, discovering an unexpected secondary periodicity in its radio emission, suggesting complex magnetic interactions.
Findings
Detected a second periodic signature at approximately 0.787 hours.
Estimated the duty cycle of radio emission from methane dwarfs to be around 3%.
Estimated the radio-loud fraction of methane dwarfs at about 8.8%.
Abstract
Brown dwarfs display Jupiter-like auroral phenomena, such as rotationally modulated electron cyclotron maser radio emission. Radio observations of cyclotron maser emission can be used to measure their magnetic field strength, topology, and to deduce the presence of magnetically interacting exoplanets. Observations of the coldest brown dwarfs (spectral types T and Y) are especially intriguing, as their magnetospheric phenomena could closely resemble those of gas-giant exoplanets. Here we report observations made over ten epochs, amounting to 44 hours, of WISEP J101905.63+652954.2 (J1019+65 hereinafter) using the LOFAR telescope between 120 and 168 MHz. J1019+65 is a methane dwarf binary (T5.5+T7) whose radio emission was originally detected in a single-epoch LOFAR observation to be highly circular polarised and rotationally modulated at h. Unexpectedly, our long-term…
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