Flare Rates, Rotation Periods. and Spectroscopic Activity Indicators of a Volume-Complete Sample of Mid-to-Late M dwarfs within 15 Parsecs

Abstract

We present a study of flare rates, rotation periods, and spectroscopic activity indicators of 125 single stars within 15 parsecs and with masses between 0.1$-$0.3 $M_{\odot }$ observed during the first year of the TESS mission, with the goal of elucidating the relationship between these various magnetically connected phenomena. We gathered multi-epoch high resolution spectra of each target and we measured equivalent widths of the activity indicators Helium I D${}_3$, $H\alpha$, and the Calcium infrared triplet line at 8542.09 angstroms. We present 18 new rotation periods from MEarth photometry and 19 new rotation periods from TESS photometry. We present a catalog of 1392 flares. After correcting for sensitivity, we find the slope of the flare frequency distribution for all stars to have a standard value of $\alpha$ = 1.98 $\pm$ 0.02. We determine R${}_{31.5}$, the rate of flares per day with energies above E = 3.16$\times$10${}^{31}$ ergs in the TESS bandpass. We find that below a critical value of $H\alpha$ EW = -0.71 angstroms, log R${}_{31.5}$ increases linearly with increasing $H\alpha$ emission; above this value, log R${}_{31.5}$ declines rapidly. The stars divide into two groups: 26% have $H\alpha$ in emission, high flare rates with typical values of log R${}_{31.5}$ = -1.30 $\pm$ 0.08, and have Rossby numbers $<$ 0.50. The remaining 74% show little to no $H\alpha$ in emission and exhibit log R${}_{31.5}$ $<$ -3.86, with the majority of these stars not showing a single flare during the TESS observations.

arXiv commentAccepted for publication in The Astrophysical Journal

References in corpus (76)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• Power-law distributions in empirical data
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• The stellar activity-rotation relationship and the evolution of stellar dynamos
• Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
• The Transiting Exoplanet Survey Satellite: Simulations of planet detections and astrophysical false positives
• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• Global Energetics of Thirty-Eight Large Solar Eruptive Events
• Rotation and Activity in Mid-M to L Dwarfs
• The Effect of a Strong Stellar Flare on the Atmospheric Chemistry of an Earth-like Planet Orbiting an M dwarf
• Design Considerations for a Ground-based Transit Search for Habitable Planets Orbiting M dwarfs
• Kepler Flares I. Active and Inactive M dwarfs
• HAT-P-16b: A 4 Mj Planet Transiting A Bright Star On An Eccentric Orbit
• The H$\alpha$ emission of nearby M dwarfs and its relation to stellar rotation
• A temperate rocky super-Earth transiting a nearby cool star
• The Palomar/MSU Nearby Star Spectroscopic Survey III: Chromospheric Activity, M-dwarf Ages and the Local Star Formation History
• Spectroscopic Properties of Cool Stars in the SDSS: An Analysis of Magnetic Activity and a Search for Subdwarfs
• Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
• STARRY: Analytic Occultation Light Curves
• The Kepler Catalog of Stellar Flares
• CHIRON - A Fiber Fed Spectrometer for Precise Radial Velocities
• Kepler Flares II: The Temporal Morphology of White-Light Flares on GJ 1243
• The stellar rotation--activity relationship in fully convective M dwarfs
• The rotation and Galactic kinematics of mid M dwarfs in the Solar Neighborhood
• Time-Resolved Properties and Global Trends in dMe Flares from Simultaneous Photometry and Spectra
• On the angular momentum evolution of fully-convective stars: rotation periods for field M-dwarfs from the MEarth transit survey
• The Kepler Cluster Study: Stellar Rotation in NGC6811
• A rocky planet transiting a nearby low-mass star
• Modeling Repeated M-dwarf Flaring at an Earth-like Planet in the Habitable Zone: I. Atmospheric Effects for an Unmagnetized Planet
• EUV Flare Activity in Late-Type Stars
• Rotation in the Pleiades with K2: I. Data and First Results
• 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
• Solar-type dynamo behaviour in fully convective stars without a tachocline
• The Origin of RNA Precursors on Exoplanets
• An Activity-Rotation Relationship and Kinematic Analysis of Nearby Mid-to-Late-type M Dwarfs
• Connecting Flares and Transient Mass Loss Events in Magnetically Active Stars
• TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844
• A White Light Megaflare on the dM4.5e Star YZ CMi
• The MUSCLES Treasury Survey. V. FUV Flares on Active and Inactive M Dwarfs
• The Factory and The Beehive II. Activity and Rotation in Praesepe and the Hyades
• M Dwarfs in SDSS Stripe 82: Photometric Light Curves and Flare Rate Analysis
• The Revolution Revolution: magnetic morphology driven spin-down
• The Surface UV Environment on Planets Orbiting M-Dwarfs: Implications for Prebiotic Chemistry & Need for Experimental Follow-Up
• New rotation period measurements for M dwarfs in the southern hemisphere: an abundance of slowly rotating, fully convective stars
• K2 Rotation Periods for low-mass Hyads and the Implications for Gyrochronology
• A second terrestrial planet orbiting the nearby M dwarf LHS 1140
• The Evolution of Flare Activity with Stellar Age
• Rotation of Late-Type Stars in Praesepe with K2
• M Dwarf Flares from Time-Resolved SDSS Spectra
• Three Red Suns in the Sky: A Transiting, Terrestrial Planet in a Triple M Dwarf System at 6.9 Parsecs
• Multi-wavelength characterization of stellar flares on low-mass stars using SDSS and 2MASS time domain surveys
• Far-Ultraviolet Activity Levels of F, G, K, and M dwarf Exoplanet Host Stars
• Risks for life on habitable planets from superflares of their host stars
• The Metastable Dynamo Model of Stellar Rotational Evolution
• EvryFlare I: Long-term Evryscope Monitoring of Flares from the Cool Stars Across Half the Southern Sky
• Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet 'b' and the discovery of a second planet
• M Dwarf Flare Continuum Variations on One-Second Timescales: Calibrating and Modeling of ULTRACAM Flare Color Indices
• The Missing Magnetic Morphology Term in Stellar Rotation Evolution
• Influence of Stellar Flares on the Chemical Composition of Exoplanets and Spectra
• Flares in Open Clusters with K2. I. M45 (Pleiades), M44 (Praesepe) and M67
• MOST Observations of the Flare Star AD Leo
• The Near-Ultraviolet Continuum Radiation in the Impulsive Phase of HF/GF-Type dMe Flares I: Data
• Kepler Flares III: Stellar Activity on GJ 1245 A and B
• Short-Term H-alpha Variability in M Dwarfs
• 10 Years of Stellar Activity for GJ 1243
• Kepler Flares IV: A Comprehensive Analysis of the Activity of the dM4e Star GJ 1243
• Chromospheric Variability in SDSS M Dwarfs. II. Short-Timescale H-alpha Variability
• Hα Emission Variability in Active M Dwarfs
• Short duration high amplitude flares detected on the M dwarf star KIC 5474065
• An increased rate of large flares at intermediate rotation periods for mid-to-late M dwarfs
• Measurements and Modeling of Total Solar Irradiance in X-Class Solar Flares

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