Precise Near-Infrared Radial Velocities
Peter Plavchan, Peter Gao, Jonathan Gagne, Elise Furlan, Carolyn, Brinkworth, Michael Bottom, Angelle Tanner, Guillem Anglada-Escude, Russel, White, Cassy Davison, Sean Mills, Chas Beichman, John Asher Johnson, David, Ciardi, Kent Wallace, Bertrand Mennesson, Gautam Vasisht
TL;DR
This paper reports on near-infrared radial velocity surveys of 36 M dwarfs using the CSHELL spectrograph, achieving 20-30 m/s precision to detect exoplanets around nearby young stars.
Contribution
Introduction of a specialized RV measurement technique in the near-infrared with a gas cell and advanced modeling to improve exoplanet detection around M dwarfs.
Findings
Achieved 20-30 m/s radial velocity precision.
Successfully surveyed 36 nearby and young M dwarfs.
Demonstrated the effectiveness of near-infrared RV measurements.
Abstract
We present the results of two 2.3 micron near-infrared radial velocity surveys to detect exoplanets around 36 nearby and young M dwarfs. We use the CSHELL spectrograph (R ~46,000) at the NASA InfraRed Telescope Facility, combined with an isotopic methane absorption gas cell for common optical path relative wavelength calibration. We have developed a sophisticated RV forward modeling code that accounts for fringing and other instrumental artifacts present in the spectra. With a spectral grasp of only 5 nm, we are able to reach long-term radial velocity dispersions of ~20-30 m/s on our survey targets.
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