NOAO >   Observing Info >   Approved Programs >   2016A-0248

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Program Information for 2016A-0248


PI: Benjamin Tofflemire, U. of Wisconsin, Madison, tofflemi@astro.wisc.edu
Address: Astronomy Department, Sterling Hall, 475 N. Charter St, Madison, WI 53706 United States

CoI: Robert Mathieu, U. of Wisconsin, Madison
CoI: David Ardila, Aerospace Corporation

Title: Accretion in Pre-Main Sequence Binaries

Abstract: Most stars are born in binaries, and the evolution of protostellar disks in pre-main sequence (PMS) binary stars is a current frontier of star formation research. PMS binary stars can have up to three accretion disks: two circumstellar disks and a circumbinary disk separated by a dynamically cleared gap. Theory suggests that mass may flow in an accretion stream from a circumbinary disk across the gap to circumstellar disks or stellar surfaces. The accretion rates are predicted to be dynamically modulated on the orbital period. Continuous, multi-orbit, multi-color photometric observations with dense phase coverage are required to detect and characterize these modulated accretion streams, if they are generally present. The queue scheduling capability of SMARTS/ANDICAM makes it an ideal facility for this observational challenge. This proposal seeks to trace the predicted accretion flows in three short-period PMS binaries (P=35$- days) that have evidence of disk material (e.g. mid-IR excess) and ongoing accretion (e.g. strong H$alpha$ emission). With time-series, optical/NIR photometric monitoring we will directly test the predictions of phase modulated accretion by determining accretion luminosities and the relative amount of accretion feeding, warm circumstellar material all as a function of orbital phase. These observations will guide an extension of the accretion paradigm from single young stars to multiple systems and inform the physics of planetary growth around binary stars.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  CT-1.3m/ANDI -- 38.3hrs


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016A-0248

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