Exploring Precision Radial Velocities in the NIR: PRVS Pathfinder

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

In summer of 2005 we began a program at Penn State to build a test instrument to explore issues involved with attaining 1 meter/sec Precision Radial Velocities (PRV) in the near infrared where M and L stars emit most of their flux. These low mass stars are the most likely place where PRV techniques will allow detection of earth mass planets in the “Habitable Zone”. Key issues studied are calibration techniques, effects of telluric absorption and modal noise in fibers. The instrument is a standard in-plane echelle spectrograph with a LN2 cooled Hawaii 1K array. It can be set to cover selected regions between 1.0 and 1.7 microns. More recently our experiments were aimed more directly toward addressing key issues in the design approach to the Gemini Precision Radial Velocity Spectrometer (PRVS) taken by the UK ATC/Penn State/U Hawaii/U Hertfordshire team. Tests to date have focused on measuring the earth’s rotation signature in the integrated sunlight spectrum. We present results showing 10 meter/sec or better precision and compare the observed errors with what is expected from the information content of the solar spectrum in this region.

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