Review
Sep 2026
Eppur binaria non \`e esclusa: Pulsations in CZ Tuc appear to be tidally excited by its veiled companion
Long secondary periods (LSPs), observed in about one-third of pulsating red giants, remain unexplained despite decades of study, with binarity and non-radial oscillations as the leading competing hypotheses. If LSP variables are indeed interacting, eccentric binary systems consisting of a red giant and a substellar obj...
P. Kołaczek-Szymański, P. Iwanek, J. Fuller et al.
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