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The unprecedented astrometry from Gaia DR2 provides us with an opportunity tostudy in detail molecular clouds in the solar neighbourhood. Extracting thewealth of information in these data remains a challenge, however. We havefurther improved our Gaussian Processes-based, three-dimensional dust mappingtechnique to allow us to study molecular clouds in more detail. Theseimprovements include a significantly better scaling of the computational costwith the number of stars, and taking into account distance uncertainties toindividual stars. Using Gaia DR2 astrometry together with 2MASS and WISEphotometry for 30 000 stars, we infer the distribution of dust out to 600 pc inthe direction of the Orion A molecular cloud. We identify a bubble-likestructure in front of Orion A, centred at a distance of about 350 pc from theSun. The main Orion A structure is visible at slightly larger distances, and weclearly see a tail extending over 100 pc that is curved and slightly inclinedto the line-of-sight. The location of our foreground structure coincides with5-10 Myr old stellar populations, suggesting a star formation episode thatpredates that of the Orion Nebula Cluster itself. We identify also the mainstructure of the Orion B molecular cloud, and in addition discover a backgroundcomponent to this at a distance of about 460 pc from the Sun. Finally, weassociate our dust components at different distances with the plane-of-the-skymagnetic field orientation as mapped by Planck. This provides valuableinformation for modelling the magnetic field in 3D around star forming regions.

Detailed 3D structure of OrionA in dust with Gaia DR2