Galactic Kinematics and Observed Flare Rates of a Volume-Complete Sample of Mid-to-Late M-dwarfs: Constraints on the History of the Stellar Radiation Environment of Planets Orbiting Low-mass Stars

Abstract

We present a study of the relationship between galactic kinematics, flare rates, chromospheric activity, and rotation periods for a volume-complete, nearly all-sky sample of 219 single stars within 15 parsecs and with masses between 0.1$-$0.3 M${}_{odot}l$ observed during the primary mission of TESS. We find all stars are consistent with a common value of $\alpha$=1.984 $\pm$ 0.019 for the exponent of the flare frequency distribution. Using our measured stellar radial velocities and Gaia astrometry, we determine galactic UVW space motions. We find 64% of stars are members of the Galactic thin disk, 5% belong to the thick disk, and for the remaining 31%, we cannot confidently assign membership to either component. If we assume star formation has been constant in the thin disk for the past 8 Gyr, then based on the fraction that we observe to be active, we estimate the average age at which these stars transition from the saturated to the unsaturated flaring regime to be 2.4 $\pm$ 0.3 Gyr. This is consistent with the ages that we assign from galactic kinematics: We find that stars with Prot $<$ 10 days have an age of 2.0 $\pm$ 1.2 Gyr, stars with 10 $<$ Prot $\le$ 90 days have an age of 5.6 $\pm$ 2.7 Gyr, and stars with Prot $>$ 90 days have an age of 12.9 $\pm$ 3.5 Gyr. We find that the average age of stars with Prot $<$ 10 days increases with decreasing stellar mass from 0.6 $\pm$ 0.3 Gyr (0.2 - 0.3 M${}_{odot}$) to 2.3 $\pm$ 1.3 Gyr (0.1--0.2 M${}_{odot}l$).

Accepted for publication in the Astrophysical Journal

References in corpus (36)

• galpy: A Python Library for Galactic Dynamics
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Large-scale magnetic topologies of late M dwarfs
• Kepler Flares I. Active and Inactive M dwarfs
• The H$\alpha$ emission of nearby M dwarfs and its relation to stellar rotation
• The Kepler Catalog of Stellar Flares
• Kepler Flares II: The Temporal Morphology of White-Light Flares on GJ 1243
• The Solar Neighborhood XXXVII: The Mass-Luminosity Relation for Main Sequence M Dwarfs
• Magnetic Cycles and Rotation Periods of Late Type Stars from photometric time series
• Activity and Kinematics of Ultracool Dwarfs Including An Amazing Flare Observation
• Magnetism, rotation, and nonthermal emission in cool stars -- Average magnetic field measurements in 292 M dwarfs
• The Factory and The Beehive II. Activity and Rotation in Praesepe and the Hyades
• Flare Statistics for Young Stars from a Convolutional Neural Network Analysis of $\text{TESS}$ Data
• Young Nearby Loose Associations
• A giant exoplanet orbiting a very low-mass star challenges planet formation models
• Age velocity dispersion relations and heating histories in disc galaxies
• The Evolution of Flare Activity with Stellar Age
• The Solar Neighborhood XLIX: Nine Giant Planets Orbiting Nearby K Dwarfs, and the CHIRON Spectrograph's Radial Velocity Performance
• The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data
• Flare Rates, Rotation Periods. and Spectroscopic Activity Indicators of a Volume-Complete Sample of Mid-to-Late M dwarfs within 15 Parsecs
• The Metastable Dynamo Model of Stellar Rotational Evolution
• Exploring the age dependent properties of M and L dwarfs using Gaia and SDSS
• Flares in Open Clusters with K2. II. Pleiades, Hyades, Praesepe, Ruprecht 147, and M67
• The Canada-France Imaging Survey: Reconstructing the Milky Way Star Formation History from its White Dwarf Population
• Flares in Open Clusters with K2. I. M45 (Pleiades), M44 (Praesepe) and M67
• Kepler Flares III: Stellar Activity on GJ 1245 A and B
• 10 Years of Stellar Activity for GJ 1243
• Evidence for Metallicity-Dependant Spin Evolution in the Kepler field
• Kepler Flares IV: A Comprehensive Analysis of the Activity of the dM4e Star GJ 1243
• Gyro-Kinematic Ages for around 30,000 Kepler Stars
• The Volume-Complete Sample of M Dwarfs with Masses 0.1 <= M/M_sol <= 0.3 within 15 Parsecs
• Zodiacal Exoplanets in Time. XI. The Orbit and Radiation Environment of the Young M Dwarf-Hosted Planet K2-25b
• TOI 540 b: A Planet Smaller than Earth Orbiting a Nearby Rapidly Rotating Low-mass Star
• Spectroscopic Orbits of Eleven Nearby, Mid-to-Late M Dwarf Binaries
• Variability Timescales of H$\alpha$ on Active Mid-to-Late M dwarfs
• The Puzzling Story of Flare Inactive Ultra Fast Rotating M dwarfs. I. Exploring their Magnetic Fields

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