A High-Precision NIR Survey for RV Variable Low-Mass Stars

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 IRTF 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 ($\approx$ 25-150 Myr) moving groups, the young field star $\epsilon$ Eridani as well as 18 nearby ($<$ 25 pc) low-mass stars and achieved typical single-measurement precisions of 8-15 m s${}^{-1}$ with a long-term stability of 15-50 m s${}^{-1}$. 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 $\sim$ 25-50 m s${}^{-1}$ at $\approx$ 2.3125 $\mu$m, thus constraining the effect of jitter at these wavelengths. We provide the first multi-wavelength confirmation of GJ 876 bc and independently retrieve orbital parameters consistent with previous studies. We recovered RV variability 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 3-5$\sigma$. Our method combined with the new iSHELL spectrograph will yield long-term RV precisions of $\lesssim$ 5 m s${}^{-1}$ in the NIR, which will allow the detection of Super-Earths near the habitable zone of mid-M dwarfs.

29 pages, 16 figures, 6 tables. Accepted for publication in ApJ

References in corpus (29)

• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• Large-scale magnetic topologies of late M dwarfs
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• The Gemini Deep Planet Survey -- GDPS
• The HARPS search for southern extra-solar planets XI. Super-Earths (5 & 8 M_Earth) in a 3-planet system
• Stellar Activity Masquerading as Planets in the Habitable Zone of the M dwarf Gliese 581
• The NASA-UC-UH Eta-Earth Program: IV. A Low-mass Planet Orbiting an M Dwarf 3.6 PC from Earth
• Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
• Exploring The Frequency Of Close-In Jovian Planets Around M Dwarfs
• Search for exoplanets with the radial-velocity technique: quantitative diagnostics of stellar activity
• The nearest young moving groups
• Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics
• High-Dispersion Optical Spectra of Nearby Stars Younger Than The Sun
• New Distant Companions to Known Nearby Stars. II. Faint companions of Hipparcos stars and the frequency of wide binary systems
• The HARPS search for southern extra-solar planets XIX. Characterization and dynamics of the GJ876 planetary system
• A novel L-band imaging search for giant planets in the Tucana and Beta Pictoris moving groups
• A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
• BOSS Ultracool Dwarfs I: Colors and Magnetic Activity of M and L dwarfs
• Differential Radial Velocities and Stellar Parameters of Nearby Young Stars
• A multiwavelength radial velocity search for planets around the brown dwarf LP 944-20
• Search for associations containing young stars (SACY). V. Is multiplicity universal? Tight multiple systems
• Towards Understanding Stellar Radial Velocity Jitter as a Function of Wavelength: The Sun as a Proxy
• 'Ultimate' Information Content in Solar and Stellar Spectra: Photospheric line asymmetries and wavelength shifts
• A 3D Search for Companions to 12 Nearby M-Dwarfs
• Analysis of combined radial velocities and activity of BD+20 1790: evidence supporting the existence of a planetary companion
• LO Pegasi: An investigation of multi-band optical polarization
• Characterizing the AB Doradus Moving Group Via High Resolution Spectroscopy and Kinematic Traceback

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