Defining Pre-Outburst and Post-Outburst Characteristics of Eruptive Young Stars

EXORs are extreme T Tauri stars that experience major UVoptical eruptions (35mag) that last about a year. These recurring outbursts driven by high accretionrates assist in dispersal of the circumstellar disk and the large XrayUV fluxinjected into the local environment modifies the physical and chemical history,influencing planet formation and time scales. Little Xray data exists on thesestars during either quiescent or outburst phases, so basic details such as howmuch Xray flux is produced during eruption is unknown. We will characterize theXray properties of 7 EXOR, while groundbased monitoring will determinewhat state the EXORs are in at the time of the XMM observtaions. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]