NOAO >   Observing Info >   Approved Programs >   2021A-0256

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Program Information for 2021A-0256


PI: Brad N Barlow, High Point University, bbarlow@highpoint.edu
Address: Department of Physics, One University Parkway, High Point, NC 27268 US

CoI: Veronika Schaffenroth, Universitat Potsdam
CoI: Kyle Corcoran, U. of Virginia
CoI: Maja Vuckovic, Universidad de Valparaiso
CoI: David Kilkenny, UWC

Title: The EREBOS Project: Understanding the Impact of Substellar Objects on Late 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. 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, but they can also survive the engulfment phase. Nearly 200 new eclipsing hot subdwarf binaries with cool, low-mass companions were 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 (2021A):  SOAR/Goodman -- 2n on Mar 11 - Mar 12 2021
Run 2 (2021A):  SOAR/Goodman -- 2n on Jun 02 - Jun 03 2021


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NOAO >   Observing Info >   Approved Programs >   2021A-0256

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