NOAO >   Observing Info >   Approved Programs >   2016A-0259

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Program Information for 2016A-0259


PI: Brad N Barlow, High Point University, bbarlow@highpoint.edu
Address: Department of Physics, 833 Montlieu Ave., High Point, North Carolina 27268 United States

CoI: Veronika Schaffenroth, Universitat Innsbruck (University of Innsbruck)
CoI: Maja Vuckovic, Universidad de Valparaiso
CoI: Stefan Kimeswenger, Universidad Catolica del Norte

Title: The EREBOS Project: Determining the Influence of Substellar Objects on Stellar Evolution

Abstract: Planets and brown dwarfs in close orbits around main sequence stars will interact with their stellar hosts once they ascend the red giant branch. The details of these interactions and their outcomes are currently unclear. Recent discoveries of brown dwarfs orbiting post-red giant branch ``hot subdwarf'' stars imply that at least some substellar objects are not only sufficient for ejecting the outer layers of a red giant's atmosphere, they can also survive the engulfment phase. Thirty- six new eclipsing hot subdwarf binaries with cool, low-mass companions were discovered from light curves obtained by the OGLE project, tripling the number of known systems. Here we propose spectroscopic observations of these short-period binaries in order to determine their orbital velocities and, ultimately, the companion masses. We will use this unique and homogeneously-selected sample to derive the mass distribution of the companions and determine the minimum mass needed to strip off the red-giant envelope and survive the common envelope phase.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  SOAR/Goodman -- 2n on Mar 30 - Mar 31 2016
Run 2 (2016A):  SOAR/Goodman -- 2n on Jun 07 - Jun 08 2016


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NOAO >   Observing Info >   Approved Programs >   2016A-0259

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