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# Program information file
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PROGRAM_ID           2024B077
PROGRAM_TITLE        Measuring the physical stellar parameters and accretion rates of young stars with planet forming disks
PROGRAM_INV1         Ellen Lee
PROGRAM_INV2         Michael Connelley
PROGRAM_INV3         Christian Flores
PROGRAM_INV4          
PROGRAM_INV5          
PROGRAM_SCICAT       stellar
PROGRAM_ABSTRACT_BEG
We propose to take SpeX and iSHELL spectra of young stars that are the targets of a complementary proposal for Subaru to perform adaptive optics [AO] observations with their new infrared wavefront sensor. The goal of the Subaru observations is to perform the first near-IR imaging observations of disks around ten early stage and/or low mass stars. The IRTF observations will place the AO images into the broader star formation context. High resolution K-band spectra with iSHELL will measure the temperature, gravity, rotation velocity, veiling disk emission, and stellar magnetic field. The temperature and gravity measurements allow us to infer the mass and age of the central star. Given the temperature and a SpeX SXD spectrum, we can fit the observed continuum with a stellar template to derive the extinction. The SXD spectrum also yields the Br gamma line flux, an important accretion tracer, which when combined with extinction, stellar mass, and radius of the star enables us to measure the accretion rate. The key outputs of this program are the stellar age, stellar mass, extinction, and mass accretion rates, for each star individually. Knowing these values are key to interpreting the Subaru AO images to gain insight on the planet forming process.
PROGRAM_ABSTRACT_END