Design of a near-IR Doppler instrument for planet searches

Bo Zhao; Jian Ge; Duy Cuong Nguyen; Ji Wang; John Groot

doi:10.1117/12.857047

20 July 2010 Design of a near-IR Doppler instrument for planet searches

Bo Zhao, Jian Ge, Duy Cuong Nguyen, Ji Wang, John Groot

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 773554 (2010) https://doi.org/10.1117/12.857047
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Doppler searches are extending to the near infrared to detect and characterize habitable planets around low mass stars. We present an optical design and performance of a near-IR Doppler instrument. This instrument has two operating modes covering 0.8-1.8 microns. One mode is called IRET, which consists of a fix-delay interferometer and a crossdispersed echelle spectrograph to simultaneously cover 0.8-1.35 microns with a spectral resolution of R=22000 on a 2k x 2k H2RG IR array. The other mode is called FIRST, which uses a silicon immersion grating as the main disperser to simultaneously cover 1.4-1.8 microns with a spectral resolution of R=55000 on the same detector as IRET. The triplepass parabola white pupil design is used to restrain background scatter radiation with stable configuration for precision radial velocity measurements. We used high index standard glasses for camera optics and VPH gratings as crossdispersers in both modes. The FIRST mode can be switched in and out conveniently while the IRET mode is kept without moving parts to increase its stability. This instrument is designed to deliver up to 1 m/s Doppler precision RV measurements of nearby bright M dwarfs at the Apache Point Observatory 3.5 meter telescope. The instrument is expected to be operational in the spring 2011.

Citation Download Citation

Bo Zhao, Jian Ge, Duy Cuong Nguyen, Ji Wang, and John Groot "Design of a near-IR Doppler instrument for planet searches", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773554 (20 July 2010); https://doi.org/10.1117/12.857047

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