Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer

Details Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer

2008-01-25

arxiv.org/abs/0801.3959v1

Astronomy and Astrophysics

Astrophysics

9 pages, 4 figures. Accepted for publication in ApJ

Scientific paper

10.1086/533514

We demonstrate the ability to measure precise stellar barycentric radial velocities with the dispersed fixed-delay interferometer technique using the Exoplanet Tracker (ET), an instrument primarily designed for precision differential Doppler velocity measurements using this technique. 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 iodine 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 ~ 5100. A multi-object version of the ET instrument capable of observing ~500 stars per night is being used at the Sloan 2.5 m telescope at Apache Point Observatory for the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS), a wide-field radial velocity survey for extrasolar planets around TYCHO-2 stars in the magnitude range 7.6

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