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The project Massive Unseen Companions to Hot Faint Underluminous Stars fromSDSS (MUCHFUSS) aims at finding hot subdwarf stars (sdBs) with massive compactcompanions such as white dwarfs, neutron stars, or stellar-mass black holes. Ina supplementary programme we obtained time-resolved spectroscopy of known hotsubdwarf binary candidates. Here we present orbital solutions of eight closesdB binaries with orbital periods ranging from 0.1 to 10 days, which allow usto derive lower limits on the masses of their companions. Additionally, adedicated photometric follow-up campaign was conducted to obtain light curvesof the reflection-effect binary HS 2043+0615. We are able to constrain the mostlikely nature of the companions in all cases but one, making use of informationderived from photometry and spectroscopy. Four sdBs have white dwarfcompanions, while another three are orbited by low-mass main sequence stars ofspectral type M.

Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions