Spitzer Space Telescope - Directors Discretionary Time Proposal #13227 Connecting mass accretion and ejection in pre-main sequence stars Principal Investigator: Catherine Espaillat Institution: Boston University Technical Contact: Catherine Espaillat, Boston University Co-Investigators: Jesus Hernandez, UNAM Sierra Grant, Boston University Enrique Macias, Boston University Mark Reynolds, University of Michigan Connor Robinson, Boston University Science Category: young stellar objects Observing Modes: IRAC Post-Cryo Mapping Hours Approved: 9.6 Abstract: Many pre-main sequence stars are surrounded by circumstellar material and display the typical signatures of astrophysical accretion disks, namely mass accretion onto the central object and mass ejection via jets. There is an observed correlation between the accretion rate onto the star and the mass loss rate. This suggests a linked formation mechanism, presumably the stellar magnetic field which can both channel material onto the star as well as eject it in collimated jets along twisted field lines. Here we propose a test of the observed correlation between mass accretion and ejection by using NIR emission to trace the mass reservoir available for accretion in the innermost disk, UV emission to detect accreting gas, and centimeter emission to trace the jet while disentangling the influence of high-energy X-ray radiation from the star. These would be the first simultaneous Chandra-HST-Spitzer-VLA observations of a young, accreting star.