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We present the first results of the LBT Imaging of Galaxy Haloes and TidalStructures (LIGHTS) survey. LIGHTS is an ongoing observational campaign withthe 2x8.4m Large Binocular Telescope (LBT) aiming to explore the stellar haloesand the low surface brightness population of satellites down to a depth ofmuV~31 mag/arcsec^2 (3 sigma in 10"x10" boxes) of nearby galaxies. Wesimultaneously collected deep imaging in the g and r Sloan filters using theLarge Binocular Cameras (LBCs). The resulting images are 60 times (i.e. ~4.5mag) deeper than those from the Sloan Digital Sky Survey (SDSS), and they havecharacteristics comparable (in depth and spatial resolution) to the onesexpected from the future Legacy Survey of Space and Time (LSST). Here we showthe first results of our pilot programme targeting NGC1042 (an M33 analogue ata distance of 13.5 Mpc) and its surroundings. The depth of the images allowedus to detect an asymmetric stellar halo in the outskirts of this galaxy whosemass (1.4+-0.4x10^8 Msun) is in agreement with the Lambda Cold Dark Matter(LambdaCDM) expectations. Additionally, we show that deep imaging from the LBTreveals low mass satellites (a few times 10^5 Msun) with very faint centralsurface brightness muV(0)~27 mag/arcsec^2 (i.e. similar to Local Group dwarfspheroidals, such as Andromeda XIV or Sextans, but at distances well beyond thelocal volume). The depth and spatial resolution provided by the LIGHTS surveyopen up a unique opportunity to explore the `missing satellites' problem in alarge variety of galaxies beyond our Local Group down to masses where thedifference between the theory and observation (if any) should be significant.

astronomy and astrophysics

Introducing the LBT Imaging of Galactic Halos and Tidal Structures  (LIGHTS) survey. A preview of the low surface brightness Universe to be  unveiled by LSST