The photophoretic sweeping of dust in transient protoplanetary disks O. Krauss, G. Wurm, O. Mousis, J.-M. Petit, J. Horner and Y. Alibert A&A, 462 3 (2007) 977-987 Published online: 21 November 2006 DOI: 10.1051/0004-6361:20066363