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The project Massive Unseen Companions to Hot Faint Underluminous Stars fromSDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compactcompanions like massive white dwarfs (M>1.0 M$_\odot$), neutron stars, orstellar-mass black holes. We present orbital and atmospheric parameters and putconstraints on the nature of the companions of 12 close hot subdwarf B star(sdB) binaries found in the course of the MUCHFUSS project. The systems showperiods between 0.14 and 7.4 days. Three systems most likely have white dwarfcompanions. SDSS J083006.17+475150.3 is likely to be a rare example of alow-mass helium-core white dwarf. SDSS J095101.28+034757.0 shows an excess inthe infrared that probably originates from a third companion in a wide orbit.SDSS J113241.58-063652.8 is the first helium deficient sdO star with aconfirmed close companion. This study brings to 142 the number of sdB binarieswith orbital periods of less than 30 days and with measured mass functions. Wepresent an analysis of the minimum companion mass distribution and show that itis bimodal. One peak around 0.1 M$_\odot$ corresponds to the low-mass mainsequence and substellar companions. The other peak around 0.4 M$_\odot$corresponds to the white dwarf companions. The derived masses for the whitedwarf companions are significantly lower than the average mass for singlecarbon-oxygen white dwarfs. In a T$_{\rm eff}$-log(g) diagram of sdB+dMcompanions, we find signs that the sdB components are more massive than therest of the sample. The full sample was compared to the known population ofextremely low-mass white dwarf binaries as well as short-period white dwarfswith main sequence companions. Both samples show a significantly differentcompanion mass distribution. We calculate merger timescales and timescales whenthe companion will fill its Roche Lobe and the system evolves into acataclysmic variable.

Hot subdwarf binaries from the MUCHFUSS project - Analysis of 12 new systems and a study of the short-period binary population