NOAO >   Observing Info >   Approved Programs >   2011B-0450

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Proposal Information for 2011B-0450


PI: Ji Wang, University of Florida, jwang@astro.ufl.edu
Address: Department of Astronomy, 211 Bryant Space Science Center, Gainesville, FL 32611, USA

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

Title: Multi-Band Study of Radial Velocity Induced by Stellar Activity with EXPERT

Abstract: Stellar activity complicates high precision radial velocity (RV) measurements. To understand stellar activity in different bands and for stars of different spectral types is extremely important, especially when we are on the verge of discovering Earth-like planet in habitable zone (HZ). We propose to use the direct echelle mode (DEM) of EXPERT instrument at KPNO 2.1m telescope to study RV jitters induced by stellar activity. Taking advantage of the wide wavelength coverage of EXPERT DEM (0.38~1.0 (mu)m), we are able to simultaneously measure RV jitters in B, V, R, I and part of Y band. The change of RV jitter with wavelength and its dependence on spectral type will be for the first time studied by observing a sample active stars. The results of the proposed study will motivate the forthcoming near infrared (NIR) precision RV instruments such as FIRST and IR-ET. In addition, it helps understand the noise level of high precision RV measurements and provides insights in the process of target selection in the search of exoplanets in HZ. Data collected in this project will be part of the Ph.D thesis for Ji Wang.


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



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