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26 April 2024

» arxiv » 1103.0004

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Precise Stellar Radial Velocities of an M Dwarf with a Michelson Interferometer and a Medium-resolution Near-infrared Spectrograph
Philip S. Muirhead ; Jerry Edelstein ; David J. Erskine ; Jason T. Wright ; Matthew W. Muterspaugh ; Kevin R. Covey ; Edward H. Wishnow ; Katherine Hamren ; Phillip Andelson ; David Kimber ; Tony Mercer ; Sam Halverson ; Andrew Vanderburg ; Danny Mondo ; Agnieszka Czeszumska ; James P. Lloyd ;
Date:	28 Feb 2011
Abstract:	Precise infrared radial velocimetry enables the detection and transit verification of low mass extrasolar planets orbiting mid-to-late M dwarf hosts, which are too faint for V-band radial velocity surveys. The TripleSpec Exoplanet Discovery Instrument, or TEDI, is the combination of a variable-delay Michelson interferometer and a medium-resolution (R=2700) near-infrared spectrograph on the Palomar 200" Hale Telescope. We used TEDI to monitor GJ 699, a nearby mid-M dwarf, over 11 nights spread across 3 months. Analysis of 106 independent observations reveals a root-mean-square precision of less than 37 m/s for 5 minutes of integration time. This performance is within a factor of 2 of our expected photon-limited precision. We further decompose the residuals into a 33 m/s white noise component, and a 15 m/s systematic noise component, which we identify as likely due to contamination by telluric absorption lines. With further development this technique holds promise for broad implementation on medium-resolution near-infrared spectrographs to search for low-mass exoplanets orbiting M dwarfs, and to verify low-mass transit candidates.
Source:	arXiv, 1103.0004
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