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EX Lupi: interpretation ?OUTBURST (single slab LTE model):- more water, same temperature --> water is produced? --> How?(Ciesla&Cuzzi 2006; Bethell&Bergin 2009; Glassgold+ 2009)- more OH, “two” components (only one in quiescence) --> UV photodissociationof water?(Tappe+ 2008, Najita+ 2010)water snow lineLout ~ 4Lquito observerRecession of the snow line in outburstmidplane iceQUIESCENCEOUTBURSTDEPTH, NmolWaterhot OHOrganicsH2Water, warm OHhot OHH2EMITTING AREA1. do we see the same effect in other TT stars?2. is it due to accretion luminosity variability?3. where is water vapor produced in the disk?4. what’s the long-term effect on disk chemistry?Water vapor : gas-phaseformation or evaporationfrom icy solids?