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# Program information file
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PROGRAM_ID           2024B020
PROGRAM_TITLE        Inner disk dynamics from M-band CO variability
PROGRAM_INV1         Andrea Banzatti
PROGRAM_INV2         Benjamin Tofflemire
PROGRAM_INV3         Jerome Bouvier
PROGRAM_INV4         Adwin Boogert
PROGRAM_INV5          
PROGRAM_SCICAT       extra-solar planets
PROGRAM_ABSTRACT_BEG
We propose to monitor the circumstellar disks of four pre-main-sequence stars over ~2 stellar rotation periods to measure the kinematic variability of M-band CO lines over timescales of days to weeks. CO variability of different types has been observed in the past in these targets on longer timescales. Simultaneous monitoring with U, V photometry will be performed to study the variable accretion and dynamics in the star-disk interaction region. Spectro-polarimetric monitoring has also been proposed for one target that previously showed the most comprehensive CO variability over months-years timescales. This synergic dataset will determine which part of the CO variability is linked to accretion and asymmetries in the inner star-disk interaction region, and which part to a variable low-velocity wind at larger disk radii. This program will significantly advance our understanding of molecular gas dynamics in planet-forming regions in connection to accretion, outflows, and inner disk evolution.
PROGRAM_ABSTRACT_END