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Proceedings Paper

A robotic, compact, and extremely high resolution optical spectrograph for a close-in super-Earth survey
Author(s): Jian Ge; Scott Powell; Bo Zhao; Frank Varosi; Bo Ma; Sirinrat Sithajan; Jian Liu; Rui Li; Nolan Grieves; Sidney Schofield; Louis Avner; Hali Jakeman; William A. Yoder; Jakob A. Gittelmacher; Michael A. Singer; Matthew Muterspaugh; Michael Williamson; J. Edward Maxwell
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Paper Abstract

One of the most astonishing results from the HARPS and Kepler planet surveys is the recent discovery of close-in super-Earths orbiting more than half of FGKM dwarfs. This new population of exoplanets represents the most dominant class of planetary systems known to date, is totally unpredicted by the classical core-accretion disk planet formation model. High cadence and high precision Doppler spectroscopy is the key to characterize properties of this new population and constrain planet formation models. A new robotic, compact high resolution optical spectrograph, called TOU (formerly called EXPERT-III), was commissioned at the Automatic Spectroscopic Telescope (AST) at Fairborn Observatory in Arizona in July 2013 and has produced a spectral resolution of about 100,000 and simultaneous wavelength coverage of 0.38-0.9 μm with a 4kx4k back-illuminated Fairchild CCD detector. The instrument holds a very high vacuum of 1 micro torr and about 2 mK temperature stability over a month. The early on-sky RV measurements show that this instrument is approaching a Doppler precision of 1 m/s (rms) for bright reference stars (such as Tau Ceti) with 5 min exposures and better than 3 m/s (P-V, RMS~1 m/s) daily RV stability before calibration exposures are applied. A pilot survey of 20 V<9 FGK dwarfs, including known super-Earth systems and known RV stable stars, is being launched and every star will be observed ~100 times over ~300 days time window between this summer and next spring, following up with a full survey of ~150 V< 10 FGKM dwarfs in 2015-2017.

Paper Details

Date Published: 28 July 2014
PDF: 12 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914786 (28 July 2014); doi: 10.1117/12.2056970
Show Author Affiliations
Jian Ge, Univ. of Florida (United States)
Scott Powell, Univ. of Florida (United States)
Bo Zhao, Univ. of Florida (United States)
Frank Varosi, Univ. of Florida (United States)
Bo Ma, Univ. of Florida (United States)
Sirinrat Sithajan, Univ. of Florida (United States)
Jian Liu, Univ. of Florida (United States)
Rui Li, Univ. of Florida (United States)
Nolan Grieves, Univ. of Florida (United States)
Sidney Schofield, Univ. of Florida (United States)
Louis Avner, Univ. of Florida (United States)
Hali Jakeman, Univ. of Florida (United States)
William A. Yoder, Univ. of Florida (United States)
Jakob A. Gittelmacher, Univ. of Florida (United States)
Michael A. Singer, Univ. of Florida (United States)
Matthew Muterspaugh, Tennessee State Univ. (United States)
Michael Williamson, Tennessee State Univ. (United States)
J. Edward Maxwell, Tennessee State Univ. (United States)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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