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American Association for the Advancement of Science, Science, 6435(364), p. 66-69, 2019

DOI: 10.1126/science.aat5330

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A planetesimal orbiting within the debris disc around a white dwarf star

Journal article published in 2019 by Christopher J. Manser ORCID, Boris T. Gänsicke ORCID, Siegfried Eggl ORCID, Mark Hollands, Paula Izquierdo ORCID, Detlev Koester ORCID, John D. Landstreet ORCID, Wladimir Lyra ORCID, Thomas R. Marsh ORCID, Farzana Meru ORCID, Alexander J. Mustill ORCID, Pablo Rodríguez-Gil ORCID, Odette Toloza, Dimitri Veras ORCID, David J. Wilson ORCID and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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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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