NOAO >   Observing Info >   Approved Programs >   2016A-0371

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Program Information for 2016A-0371


PI: Ann Marie Cody, NASA Ames Research Center, annmarie.cody@nasa.gov
Address: MS 244-30, Moffett Field, Califiornia 94035 USA

CoI: Michael Ireland, Australian National U.
CoI: Gail Schaefer, Georgia State U.
CoI: Rafael Millan-Gabet, California Institute of Technology

Title: Time domain interferometry of a variable young star: Revealing the inner disk

Abstract: Time domain photometry on disk-bearing young stars from the K2 Mission has revealed high levels of short-timescale variability ascribable to inner disk dynamics. This region from the stellar surface to the inner AU is a complex environment containing orbiting dust clouds, magnetic warps, and accretion columns. Time domain photometry partially maps out these features, thereby shedding light on the dust and gas conditions at a time and location where terrestrial planet assembly may be underway. However, the process of inferring disk structure from variable light curves is hampered by degeneracies. What is needed to fully map these regions is spatially resolved information on sub-AU size scales-- a task well suited for the CHARA array. We propose here to test the origin of high amplitude brightness fluctuations in the young star AS 205 A by monitoring it interferometrically over the course of several nights with CHARA. The observed visibilities will be examined for inter-night variation as well as fit with dust/gas distribution models to determine the origin of variability and its implications for inner disk structure.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  CHARA/Climb -- 16hrs


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NOAO >   Observing Info >   Approved Programs >   2016A-0371

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