Untangling mysterious emission in some cool white dwarfs

In March 2021 work led by University College London graduate student Nik Walters was accepted to MNRAS analyzing GD 356, the prototype of a new class of just four white dwarfs that exhibit Balmer emission lines despite being apparently isolated stars. Here we provide strong evidence that this emission is not the result of a current generated by a close-in rocky planet conducting electrons, as has been proposed by previous groups. This work includes multiple BUWD group researchers, as well as data collected remotely during the COVID-19 pandemic from BU’s 1.8-meter Perkins Telescope Observatory, which helped rule out large spin-period changes in this rapidly rotating white dwarf.

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