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Manser, Christopher J; Gänsicke, Boris T; Eggl, Siegfried; Hollands, Mark; Izquierdo, Paula; Koester, Detlev; Landstreet, John D; Lyra, Wladimir; Marsh, Thomas R; Meru, Farzana; Mustill, Alexander J; Rodríguez-Gil, Pablo; Toloza, Odette; Veras, Dimitri; Wilson, David J; Burleigh, Matthew R; Davies, Melvyn B; Farihi, Jay; Nicola Gentile Fusillo; de Martino, Domitilla; Parsons, Steven G; Quirrenbach, Andreas; Raddi, Roberto; Reffert, Sabine; Melania Del Santo; Schreiber, Matthias R; Silvotti, Roberto; Toonen, Silvia; Villaver, Eva; Wyatt, Mark; Xu, Siyi; Simon Portegies Zwart
arXiv.org, 04/2019Paper, Journal Article
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 123.4min periodic variation in the strength and shape of the CaII emission line profiles originating from the debris disc around the white dwarf SDSSJ122859.93+104032.9. We interpret this short-period signal as the signature of a solid body held together by its internal strength.
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