# # Program information file # PROGRAM_ID 2022A062 PROGRAM_TITLE Observing asymmetry and potential variability due to embedded companions in the ro-vibrational CO emission of HD 36112 and V380 Ori. PROGRAM_INV1 Joshua Kern PROGRAM_INV2 Sean Brittain PROGRAM_INV3 Andrea Banzatti PROGRAM_INV4 Stanley Jensen PROGRAM_INV5 Janus Kozdon PROGRAM_SCICAT extra-solar planets PROGRAM_ABSTRACT_BEG Long term monitoring of protoplanetary disks using high resolution spectroscopy and spectroastrometry have been shown to provide evidence for forming planets and various kinematics within the disk [e.g. accretion flows, MHD winds]. Previous observations of the ro-vibrational CO emission in HD 36112 and V380 Ori show signs of asymmetry which may be due to embedded companions. We propose to observe these targets with iSHELL and obtain a SNR per pixel ~100 to characterize the asymmetries in the CO emission and detect any variability. We will also observe these systems along four position angles [semi-major and minor axes as well as two intermediate positions offset by +/- 45 degrees] in order to make spectroastrometric measurements and localize the source of the asymmetries. For emission extending 1 AU, with a line-continuum ratio of 0.35 for HD 36112 [d~155 pc] and a line-continuum ratio of 1 for V380 Ori [~374 pc], the maximum shifts will be 2.5 and 2.0 mas, respectively. With a SNR per pixel ~100, the fidelity in the spectroastrometric signals will be ~3 mas, however, we will stack approximately 50 lines increasing the fidelity to ~0.4 mas which will allow for a ~5s detection. With this data, we will be able to confirm any variability of the line profiles and localize the source of the asymmetry. PROGRAM_ABSTRACT_END