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High-resolution circular spectropolarimetric observations, obtained withESPaDOnS in the context of the BinaMIcS Large Program, have revealed a magneticfield in the B3V secondary component of the SB2 binary system $\epsilon$ Lupi(B2/B3). As the B2V primary is already known to be magnetic, this is the firstdetection of a magnetic field in both components of an early-type binarysystem. The longitudinal magnetic field of the primary is $\sim -200$ G; thatof the secondary $\sim +100$ G. Observations can be approximately reproduced bya model assuming the magnetic axes of the two stars are anti-aligned, androughly parallel to their respective rotation axes. Estimated magnetosphericradii indicate a high probability that their magnetospheres are interacting. Asmany of the arguments for the different proposed formation scenarios of fossilmagnetic fields rely upon evidence drawn from investigations of close binaries,in particular the rarity of magnetic ABO stars in close binaries and theprevious absence of any known close binary with two magnetic, massive stars,this discovery may be an important new constraint on the origin of fossilmagnetic fields.

Detection of magnetic fields in both B-type components of the $\epsilon$ Lupi system: a new constraint on the origin of fossil fields?