All-sky extrasolar planet searches with multi-object dispersed fixed-delay interferometer in optical and near IR

Jian Ge; Suvrath Mahadevan; Julian C. van Eyken; Curtis DeWitt; Jerry Friedman; Deqing Ren

doi:10.1117/12.551989

30 September 2004 All-sky extrasolar planet searches with multi-object dispersed fixed-delay interferometer in optical and near IR

Jian Ge, Suvrath Mahadevan, Julian C. van Eyken, Curtis DeWitt, Jerry Friedman, Deqing Ren

Author Affiliations +

Proceedings Volume 5492, Ground-based Instrumentation for Astronomy; (2004) https://doi.org/10.1117/12.551989
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

An all sky survey for extrasolar planets with wide field telescopes, Sloan 2.5m and WIYN 3.5 telescopes, is being developed. This survey will use a multi-object version of current Exoplanet Tracker (ET) Doppler instrument commissioned at the KPNO 2.1m telescope in June 2004. This instrument is based on dispersed fixed-delay interferometer, a combination of a Michelson interferometer with a moderate dispersion spectrometer (Ge 2002). This custom designed instrument (f/2 optics) has a wavelength coverage of ~ 600 Å with a 4kx4k CCD camera at a spectral resolution of R = 5,000. The measured instrument detection efficiency, including telescope, fiber, interferometer, spectrometer and detector losses, has ~ 18% (or 50% throughput from the fiber input to the detector), more than 4 times higher than current echelle instruments being used for planet detection. ET has been able to routinely obtain S/N ~ 80 data for V ~ 8 mag. stars in 15 min exposures with the KPNO 2.1m. It allows us to reach ~ 3.5 m/s Doppler precision for radial velocity (RV) stable stars with S/N ~ 120 per pixel. It also allows us to confirm an exoplanet curve of HD 130322 (V = 8.05) with rms Doppler error of 12.3 m/s (preliminary results). We are in the middle of design of two prototype multiple object RV instrument for the Sloan and WIYN telescopes, which are capable of observing 50 stars (V ~ 8-13) in a single exposure. We plan to conduct the all sky survey for planets around ~ 1 millions of stars with Sloan starting in 2008. Our goal is to identify ~ 100,000 extrasolar planets with ~ 1,000 solar analogues through this survey.

Citation Download Citation

Jian Ge, Suvrath Mahadevan, Julian C. van Eyken, Curtis DeWitt, Jerry Friedman, and Deqing Ren "All-sky extrasolar planet searches with multi-object dispersed fixed-delay interferometer in optical and near IR", Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); https://doi.org/10.1117/12.551989

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