New Time-Resolved, Multi-Band Flares In The GJ 65 System With gPhoton
arXiv:2202.02861 · doi:10.3847/1538-4357/ac5037
Abstract
Characterizing the distribution of flare properties and occurrence rates is important for understanding habitability of M dwarf exoplanets. The GALEX space telescope observed the GJ 65 system, composed of the active, flaring M stars BL Cet and UV Cet, for 15900 seconds (~4.4 hours) in two ultraviolet bands. The contrast in flux between flares and the photospheres of cool stars is maximized at ultraviolet wavelengths, and GJ 65 is the brightest and nearest flaring M dwarf system with significant GALEX coverage. It therefore represents the best opportunity to measure low energy flares with GALEX. We construct high cadence light curves from calibrated photon events and find 13 new flare events with NUV energies ranging from 10^28.5 - 10^29.5 ergs and recover one previously reported flare with an energy of 10^31 ergs. The newly reported flares are among the smallest M dwarf flares observed in the ultraviolet with sufficient time resolution to discern light curve morphology. The estimated flare frequency at these low energies is consistent with extrapolation from the distributions of higher-energy flares on active M dwarfs measured by other surveys. The largest flare in our sample is bright enough to exceed the local non-linearity threshold of the GALEX detectors, which precludes color analysis. However, we detect quasi-periodic pulsations (QPP) during this flare in both the FUV and NUV bands at a period of ~50 seconds, which we interpret as a modulation of the flare's chromospheric thermal emission through periodic triggering of reconnection by external MHD oscillations in the corona.
arXiv comment22 pages, 20 figures, Jupyter Python notebooks to reproduce figures and tables available on GitHub at https://github.com/MillionConcepts/gfcat_gj65
References in corpus (67)
- Astropy: A Community Python Package for Astronomy
- Gaia Data Release 2. Summary of the contents and survey properties
- The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
- The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
- Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
- The Effect of a Strong Stellar Flare on the Atmospheric Chemistry of an Earth-like Planet Orbiting an M dwarf
- Kepler Flares I. Active and Inactive M dwarfs
- A simple test for periodic signals in red noise
- How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70
- A Re-appraisal of the Habitability of Planets Around M Dwarf Stars
- Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
- The Kepler Catalog of Stellar Flares
- Kepler Flares II: The Temporal Morphology of White-Light Flares on GJ 1243
- Time-Resolved Properties and Global Trends in dMe Flares from Simultaneous Photometry and Spectra
- How to Characterize Habitable Worlds and Signs of Life
- The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
- Modeling Repeated M-dwarf Flaring at an Earth-like Planet in the Habitable Zone: I. Atmospheric Effects for an Unmagnetized Planet
- Statistical properties of superflares on solar-type stars based on 1-min cadence data
- Atmospheric escape from the TRAPPIST-1 planets and implications for habitability
- White-light flares on cool stars in the Kepler Quarter 1 Data
- Connecting Flares and Transient Mass Loss Events in Magnetically Active Stars
- Microflares and the Statistics of X-ray Flares
- The MUSCLES Treasury Survey. V. FUV Flares on Active and Inactive M Dwarfs
- Influence of the UV Environment on the Synthesis of Prebiotic Molecules
- The Surface UV Environment on Planets Orbiting M-Dwarfs: Implications for Prebiotic Chemistry & Need for Experimental Follow-Up
- Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra
- Computing Intrinsic Lyman-alpha Fluxes of F5 V to M5 V Stars
- Predicting the Extreme Ultraviolet Radiation Environment of Exoplanets Around Low-Mass Stars: the TRAPPIST-1 System
- UV Surface Habitability of the TRAPPIST-1 System
- Soft X-ray Pulsations in Solar Flares
- Statistical Properties of Quasi-Periodic Pulsations in White-Light Flares Observed With Kepler
- Semi-empirical Modeling of the Photosphere, Chromosphere, Transition Region, and Corona of the M-dwarf Host Star GJ 832
- Multi-wavelength characterization of stellar flares on low-mass stars using SDSS and 2MASS time domain surveys
- HAZMAT. IV. Flares and Superflares on Young M Stars in the Far Ultraviolet
- The global and small-scale magnetic fields of fully convective, rapidly spinning M dwarf pair GJ65A and B
- No Such Thing as a Simple Flare: Substructure and QPPs Observed in a Statistical Sample of 20 Second Cadence TESS Flares
- EvryFlare I: Long-term Evryscope Monitoring of Flares from the Cool Stars Across Half the Southern Sky
- Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through FUV Observations
- Influence of Stellar Flares on the Chemical Composition of Exoplanets and Spectra
- gPhoton: The GALEX Photon Data Archive
- GALEX high time-resolution ultraviolet observations of dMe flare events
- The detection of M-dwarf UV flare events in the GALEX data archives
- Probing the Origin of Stellar Flares on M dwarfs Using TESS Data Sectors 1-3
- Surprisingly different starspot distributions on the near equal-mass equal-rotation-rate stars in the M dwarf binary GJ 65 AB
- Impact of Stellar Superflares on Planetary Habitability
- GALEX Observations of an Energetic Ultraviolet Flare on the dM4e Star GJ 3685A
- Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data
- Short Duration Stellar Flares in GALEX Data
- Detection of a giant flare displaying quasi-periodic pulsations from a pre-main sequence M star with NGTS
- A blueprint of state-of-the-art techniques for detecting quasi-periodic pulsations in solar and stellar flares
- Quasi-periodic pulsations in the most powerful solar flare of Cycle 24
- Modeling Stellar Proton Event-induced particle radiation dose on close-in exoplanets
- K2 Ultracool Dwarfs Survey II: The White Light Flare Rate of Young Brown Dwarfs
- The red dwarf pair GJ65AB: inflated, spinning twins of Proxima
- Effect of stellar flares on the upper atmospheres of HD 189733b and HD 209458b
- HAZMAT II: Ultraviolet Variability of Low-Mass Stars in the GALEX Archive
- Do long-cadence data of {\it Kepler} satellite capture the basic properties of flares ?
- The Galex Ultraviolet Variability (GUVV) Catalog
- Significance testing for quasi-periodic pulsations in solar and stellar flares
- Stellar Superflares Observed Simultaneously with Kepler and XMM-Newton
- A Multi-Period Oscillation in a Stellar Superflare
- The Multiple Continuum Components in the White Light Flare of 16 January 2009 on the dM4.5e Star YZ CMi
- DRAFTS: A Deep, Rapid Archival Flare Transient Search in the Galactic Bulge
- Photometric Flaring Fraction of M dwarf Stars from the SkyMapper Southern Survey
- A search for rapidly pulsating hot subdwarf stars in the GALEX survey
- Discovery of the subsecond linearly polarized spikes of synchrotron origin in the UV Ceti giant optical flare
- Searching for Short-Timescale Variability in the Ultraviolet with the GALEX gPhoton Archive I.: Artifacts and Spurious Periodicities