A Pathfinder Instrument for Precision Radial Velocities in the Near-Infrared

Details A Pathfinder Instrument for Precision Radial Velocities in the Near-Infrared A Pathfinder Instrument for Precision Radial Velocities in the Near-Infrared

2008-06-23

arxiv.org/abs/0806.3749v1

Astronomy and Astrophysics

Astrophysics

18 pages, 8 figures, accepted for publication in PASP

Scientific paper

10.1086/591233

We have designed and tested an in-plane echelle spectrograph configured to investigate precision radial velocities from ground-based near-infrared observations. The spectrograph operates across the spectral range of 0.9-1.7 mm at a spectral resolution of R = 50,000, and uses a liquid nitrogen-cooled HAWAII 1K detector. Repeated measurements of the Earth's rotation via integrated Sunlight with two different instrument arrangements in the near infrared Y band have produced radial velocities with ~10 m/s RMS over a period of several hours. The most recent instrument configuration has achieved an unbinned RMS of 7 m/s and suggests that infrared radial velocity precisions may be able to approach those achieved at optical wavelengths.

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