A high-precision near-infrared survey for radial velocity variable low-mass stars using CSHELL and a methane gas cell

Gagne, Jonathan and Plavchan, Peter and Gao, Peter and Anglada-Escude, Guillem and Furlan, Elise and Davison, Cassy and Tanner, Angelle and Henry, Todd J. and Riedel, Adric R. and Brinkworth, Carolyn and Latham, David and Bottom, Michael and White, Russel and Mills, Sean and Beichman, Chas and Johnson, John A. and Ciardi, David R. and Wallace, Kent and Mennesson, Bertrand and von Braun, Kaspar and Vasisht, Gautam and Prato, Lisa and Kane, Stephen R. and Mamajek, Eric E. and Walp, Bernie and Crawford, Timothy J. and Rougeot, Raphael and Geneser, Claire S. and Catanzarite, Joseph (2016) A high-precision near-infrared survey for radial velocity variable low-mass stars using CSHELL and a methane gas cell. The Astrophysical Journal, 822 (1). pp. 40-63. ISSN 0004-637X

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Abstract

We present the results of a precise near-infrared (NIR) radial velocity (RV) survey of 32 low-mass stars with spectral types K2-M4 using CSHELL at the NASA InfraRed Telescope Facility in the K band with an isotopologue methane gas cell to achieve wavelength calibration and a novel, iterative RV extraction method. We surveyed 14 members of young (≈25-150 Myr) moving groups, the young field star ϵ Eridani, and 18 nearby (<25 pc) low-mass stars and achieved typical single-measurement precisions of 8-15 m s-1with a long-term stability of 15-50 m s-1 over longer baselines. We obtain the best NIR RV constraints to date on 27 targets in our sample, 19 of which were never followed by high-precision RV surveys. Our results indicate that very active stars can display long-term RV variations as low as ∼25-50 m s-1 at ≈2.3125 μm, thus constraining the effect of jitter at these wavelengths. We provide the first multiwavelength confirmation of GJ 876 bc and independently retrieve orbital parameters consistent with previous studies. We recovered RV variabilities for HD 160934 AB and GJ 725 AB that are consistent with their known binary orbits, and nine other targets are candidate RV variables with a statistical significance of 3σ-5σ. Our method, combined with the new iSHELL spectrograph, will yield long-term RV precisions of ≲5 m s-1 in the NIR, which will allow the detection of super-Earths near the habitable zone of mid-M dwarfs.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 31 May 2017 06:54
Last Modified: 27 Jun 2017 04:28
Uncontrolled Keywords: planetary systems; planets and satellites: detection; stars: low-mass; techniques: radial velocities;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/0004-637X/822/1/40
URI: http://eprints.usq.edu.au/id/eprint/32095

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