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 4 μm at a spectral resolution of R=50,000, and uses a liquid nitrogen-cooled HAWAII 1 K 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 -1 rms over a period of several hours. The most recent instrument configuration has achieved an unbinned rms of 7 nns-1 and suggests that infrared radial velocity precisions may be able to approach those achieved at optical wavelengths.
|Original language||English (US)|
|Number of pages||8|
|Journal||Publications of the Astronomical Society of the Pacific|
|State||Published - Aug 2008|
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science