Measuring Precise Stellar Barycentric Radial Velocities with a Dispersed Fixed-Delay Interferometer: Implications for a Multi-Object Survey

Details Measuring Precise Stellar Barycentric Radial Velocities with a Dispersed Fixed-Delay Interferometer: Implications for a Multi-Object Survey Measuring Precise Stellar Barycentric Radial Velocities with a Dispersed Fixed-Delay Interferometer: Implications for a Multi-Object Survey

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916907m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #169.07; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We demonstrate the ability to measure precise barycentric stellar radial velocities using the Exoplanet Tracker (ET), a new instrument primarily designed for precision differential Doppler velocity measurements. Our barycentric radial velocities, derived from observations taken at the KPNO 2.1 meter telescope, differ from those of Nidever et al. by 0.047 km/s (RMS) when simultaneous iodine calibration is used, and by 0.120 km/s (RMS) without simultaneous calibration. Our results effectively show that a Michelson interferometer coupled to a spectrograph allows precise measurements of barycentric radial velocities even at a modest spectral resolution of R 5000-6000. A large multi-object survey to find extrasolar planets using an instrument based on the ET prototype is already underway at the Sloan 2.5 meter telescope and can observe up to 500 stars per night in the magnitude range 7.6

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