NOAO >   Observing Info >   Approved Programs >   2012A-0558

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Proposal Information for 2012A-0558


PI: Eric A. Petersen, University of Florida, ericp@astro.ufl.edu
Address: Department of Astronomy, PO Box 112055, Gainesville, FL 32611, USA

CoI: Jian Ge, University of Florida
CoI: Bo Ma, University of Florida
CoI: Rui Li, University of Florida

Title: Spectroscopic Verification of Stellar Parameters for a Subsample of Metal-Poor MARVELS Stars

Abstract: Exoplanet science has taken off in the past two decades. With many hundreds of planets now known, we are able to start assembling statistically significant samples of systems to understand how various stellar and planetary parameters are related. One of the more robust relationships is that between the fraction of stars with a (giant) planet(s) and stellar iron abundance, [Fe/H]. While the giant planet fraction is well-known at near-solar and super-solar metallicities, the metal-poor end is somewhat uncertain. By examining the unprecedented number of low-metallicity stars that MARVELS monitors, we will be able to further constrain the giant planet frequency function. Here we propose to use our EXPERT instrument at the KPNO 2.1m to obtain high- resolution spectra of 89 sub-solar metallicity stars to check for contamination of the very low metallicity histogram bins by higher- [Fe/H] stars. By reducing these spectra, we will be able to characterize the contamination rate and draw conclusions about how it affects the entire MARVELS sample. Understanding this rate will also improve our understanding of the stellar properties in our sample, and therefore lead to a better knowledge of the exoplanet statistics.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012A-0558

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