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Proceedings Paper

On-sky Doppler performance of TOU optical very high-resolution spectrograph for detecting low-mass planets
Author(s): Jian Ge; Bo Ma; Sirinrat Sithajan; Michael A. Singer; Scott Powell; Frank Varosi; Bo Zhao; Sidney Schofield; Jian Liu; Nolan Grieves; Anthony Cassette; Louis Avner; Hali Jakeman; Matthew Muterspaugh; Michael Williamson; Rory Barnes
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Paper Abstract

The TOU robotic, compact very high resolution optical spectrograph (R=100,000, 0.38-0.9 microns) has been fully characterized at the 2 meter Automatic Spectroscopy Telescope (AST) at Fairborn Observatory in Arizona during its pilot survey of 12 bright FGK dwarfs in 2015. This instrument has delivered sub m/s Doppler precision for bright reference stars (e.g., 0.7 m/s for Tau Ceti over 60 days) with 5-30 min exposures and 0.7 m/s long-term instrument stability, which is the best performance among all of the known Doppler spectrographs to our knowledge. This performance was achieved by maintaining the instrument in a very high vacuum of 1 micron torr and about 0.5 mK (RMS) long-term temperature stability through an innovative close-loop instrument bench temperature control. It has discovered a 21 Earth-mass planet (P=43days) around a bright K dwarf and confirmed three super-Earth planetary systems, HD 1461, 190360 and HD 219314. This instrument will be used to conduct the Dharma Planet Survey (DPS) in 2016-2019 to monitor ~100 nearby very bright FGK dwarfs (most of them brighter than V=8) at the dedicated 50-inch Robotic Telescope on Mt. Lemmon. With very high RV precision and high cadence (~100 observations per target randomly spread over 450 days), a large number of rocky planets, including possible habitable ones, are expected to be detected. The survey also provides the largest single homogenous high precision RV sample of nearby stars for studying low mass planet populations and constraining various planet formation models. Instrument on-sky performance is summarized.

Paper Details

Date Published: 9 August 2016
PDF: 12 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99086I (9 August 2016); doi: 10.1117/12.2232217
Show Author Affiliations
Jian Ge, Univ. of Florida (United States)
Bo Ma, Univ. of Florida (United States)
Sirinrat Sithajan, Univ. of Florida (United States)
Michael A. Singer, Univ. of Florida (United States)
Scott Powell, Univ. of Florida (United States)
Frank Varosi, Univ. of Florida (United States)
Bo Zhao, Univ. of Florida (United States)
Sidney Schofield, Univ. of Florida (United States)
Jian Liu, Univ. of Florida (United States)
Nolan Grieves, Univ. of Florida (United States)
Anthony Cassette, Univ. of Florida (United States)
Louis Avner, Univ. of Florida (United States)
Hali Jakeman, Univ. of Florida (United States)
Matthew Muterspaugh, Tennessee State Univ. (United States)
Michael Williamson, Tennessee State Univ. (United States)
Rory Barnes, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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