NOAO >   Observing Info >   Approved Programs >   2011B-0206

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Proposal Information for 2011B-0206


PI: Jay Farihi, University of Leicester, jf123@star.le.ac.uk
Address: Physics Department, University Road, Leicester LE1 7RH, UK

CoI: Seth Redfield, Wesleyan University
CoI: Jay Holberg, University of Arizona
CoI: Detlev Koester, University of Kiel
CoI: Martin Barstow, University of Leicester

Title: The Bulk Composition of Rocky Planetary Debris and a Search for Water

Abstract: We propose medium-resolution spectroscopy to measure the abundances of several trace heavy elements in a sample of externally polluted, cool, He atmosphere white dwarfs discovered in the SDSS. Six years of \em Spitzer studies have firmly connected metal-rich white dwarfs with closely orbiting, rocky debris that likely results from the tidal disruption of one or more minor planets. With steady-state and time- dependent models for the atmospheric, heavy element pollution, the proposed observations will indirectly determine the bulk composition of the accreted planetary material. Spectroscopy of metal-contaminated white dwarfs constrains the frequency and bulk composition of extrasolar, terrestrial planetary bodies at intermediate mass stars; no other technique has this power. Importantly, the proposed experiment has the potential to identify water-rich, rocky parent bodies via oxygen detected in excess of that expected for mineral oxides, and thus has implications for habitable planet building in the Galaxy.


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NOAO >   Observing Info >   Approved Programs >   2011B-0206

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