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Recent magnetic field surveys in O- and B-type stars revealed that about 10%of the core-hydrogen-burning massive stars host large-scale magnetic fields.The physical origin of these fields is highly debated. To identify and modelthe physical processes responsible for the generation of magnetic fields inmassive stars, it is important to establish whether magnetic massive stars arefound in very young star-forming regions or whether they are formed in closeinteracting binary systems.  In the framework of our ESO Large Program, we carried out low-resolutionspectropolarimetric observations with FORS2 in 2013 April of the three mostmassive central stars in the Trifid nebula, HD164492A, HD164492C, andHD164492D. These observations indicated a strong longitudinal magnetic field ofabout 500-600G in the poorly studied component HD164492C. To confirm thisdetection, we used HARPS in spectropolarimetric mode on two consecutive nightsin 2013 June.  Our HARPS observations confirmed the longitudinal magnetic field inHD164492C. Furthermore, the HARPS observations revealed that HD164492C cannotbe considered as a single star as it possesses one or two companions. Thespectral appearance indicates that the primary is most likely of spectral typeB1-B1.5V. Since in both observing nights most spectral lines appear blended, itis currently unclear which components are magnetic. Long-term monitoring usinghigh-resolution spectropolarimetry is necessary to separate the contribution ofeach component to the magnetic signal. Given the location of the systemHD164492C in one of the youngest star formation regions, this system can beconsidered as a Rosetta Stone for our understanding of the origin of magneticfields in massive stars.

B fields in OB stars (BOB): The discovery of a magnetic field in a multiple system in the Trifid Nebula, one of the youngest star forming regions