NOAO >   Observing Info >   Approved Programs >   2020A-0268

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Program Information for 2020A-0268


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

CoI: Isaac Parker, High Point University
CoI: Veronika Schaffenroth, Carnegie Institution for Science, DTM
CoI: Stephan Geier, Carnegie Institution for Science, DTM
CoI: Maja Vuckovic, Universidad de Valparaiso
CoI: Kyle Corcoran, U. of Virginia

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. More than 150 new eclipsing hot subdwarf binaries with cool, low-mass companions were recently discovered from light curves obtained by the OGLE and ATLAS projects, increasing the number of known systems by nearly a factor of ten. Here we propose spectroscopic observations of some of these short-period binaries in order to determine their orbital velocities and, ultimately, the companion masses. We also propose photometric observations of some of the fainter objects to improve upon the discovery light curves. 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 (2020A):  SOAR/Goodman -- 2n on Feb 17 - Feb 18 2020
Run 2 (2020A):  SOAR/Goodman -- 2n on Jun 14 - Jun 15 2020


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