Photometric and polarimetric clues to the circumstellar environment of RY Lupi N. Manset, P. Bastien, F. Ménard, C. Bertout, A. Le Van Suu and L. Boivin A&A, 499 1 (2009) 137-148 Published online: 25 March 2009 DOI: 10.1051/0004-6361/200810945