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 6 EXORs in their quiescent phase. If an eruption of anyknown EXOR occurs during AO6, a highquality spectrum will be obtained.Contrasting quiescent and outburst properties provides crucial insight into the physics. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]