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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 (massive white dwarfs M>1.0 Msun, neutron stars or stellar massblack holes). The existence of such systems is predicted by binary evolutiontheory and some candidate systems have been found. We classified about 1400 hotsubdwarf stars from the Sloan Digital Sky Survey (SDSS) by colour selection andvisual inspection of their spectra. Stars with high velocities have beenreobserved and individual SDSS spectra have been analysed. In total 201 radialvelocity variable subdwarfs have been discovered and about 140 of them havebeen selected as good candidates for follow-up time resolved spectroscopy toderive their orbital parameters and photometric follow-up to search forfeatures like eclipses in the light curves. Up to now we found seven closebinary sdBs with short orbital periods ranging from 0.21 d to 1.5 d and twoeclipsing binaries with companions that are most likely of substellar nature. Anew pulsating sdB in a close binary system has been discovered as well.

The MUCHFUSS project - Searching for the most massive companions to hot subdwarf stars in close binaries and finding the least massive ones