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The project Massive Unseen Companions to Hot Faint Underluminous Stars fromSDSS (muchfuss) aims to discover subdwarf-B stars with massive compactcompanions such as overmassive white dwarfs (M > 1.0 M_sun), neutron stars orblack holes. From the 127 subdwarfs with substantial radial-velocity variationsdiscovered in the initial survey, a number of interesting objects have beenselected for extensive follow-up. After an initial photometry run with BUSCArevealed that FBS 0117+396 is photometrically variable both on long and shorttimescales, we chose it as an auxiliary target during a 6-night multi-colorphotometry run with Ultracam. Spectroscopy was obtained at a number ofobservatories in order to determine the binary period and obtain aradial-velocity amplitude. After establishing an orbital period of P = 0.252 d,and removing the signal associated with the irradiated hemisphere of theM-dwarf companion, we were able to detect ten pulsation periods in the Fourierspectrum of the light curve. Two pulsation modes are found to have shortperiods of 337 and 379 s, and at least eight modes are found with periodsbetween 45 minutes and 2.5 hours. This establishes that FBS 0117+396 is ansdB+dM reflection binary, in which the primary is a hybrid pulsator, and thefirst one found with this particular melange of flavours.

Binaries discovered by the MUCHFUSS project; FBS 0117+396: An sdB+dM binary with a pulsating primary