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tokens: Acknowledgement We thank C. Dominik for his extremely valuable input on infrared excesses of circumstellar disks and the anonymous referee for providing useful feedback that helped to improve the quality of this article. The research of A.J.B. and F.S. leading to these results has received funding from the European Research Council under ERC Starting Grant agreement 678194 (FALCONER). M.B. acknowledges funding from ANR of France under contract number ANR-16-CE31-0013 (Planet Forming disks). Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This publication makes use of VOSA, developed under the Spanish Virtual Observatory project supported from the Spanish MINECO through grant AyA2017-84089. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France ( Wenger et al. 2000 ). To achieve the scientific results presented in this article we made use of the Python programming language 4 , especially the SciPy ( Jones et al. 2001 –), NumPy ( Oliphant 2006 ), Matplotlib ( Hunter 2007 ), scikit-image ( Van der Walt et al. 2014 ), scikit-learn ( Pedregosa et al. 2012 ), photutils ( Bradley et al. 2016 ), and astropy ( Astropy Collaboration 2013 , 2018 ) packages.