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Updated: Jan 26, 2026

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
Published on: July 28, 2018
A planetesimal orbiting within the debris disc around a white dwarf star
Christopher J Manser1, Boris T Gänsicke2,3, Siegfried Eggl4
1Department of Physics, University of Warwick, Coventry CV4 7AL, UK. c.j.manser92@googlemail.com.
Abstract:
Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, visible through emission lines. We report a stable 123.4-minute periodic variation in the strength and shape of the Ca ii emission line profiles originating from the debris disc around the white dwarf SDSS J122859.93+104032.9. We interpret this short-period signal as the signature of a solid-body planetesimal held together by its internal strength.
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