PI: Carl Melis, UC San Diego, firstname.lastname@example.org
Address: Center for Astrophysics and Space Sciences, 9500 Gilman Drive, Code 0424, La Jolla, CA, 92093-0424 USA
CoI: Patrick Dufour, University of Montreal
CoI: Benjamin Zuckerman, UCLA
Title: Scratching the surface of other worlds: water anyone?
Abstract: White dwarf stars are now known to regularly accrete material from their extant planetary systems. We have recently identified a class of white dwarfs whose pollution can be extremely iron-poor, suggesting that they are accreting the crust-mantle region of differentiated rocky bodies. With this realization, we now seek to systematically characterize the surface of rocky bodies outside of the Solar system. In this proposal we start our search by hunting “water worlds” - those objects whose outer layers have a significant amount of water by mass. To do this, we will search for O, Mg, Si, and depleted Fe in He-dominated atmosphere white dwarfs with significant H-pollution.
Program Type: Standard/Galactic
Run 1 (2017A): GEM-N-SVC/GRACES -- 8hrs band 2 (GN-2017A-Q-42)
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360