A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect
Article
Tristan, Isaiah I., Notsu, Yuta, Kowalski, Adam F., Brown, Alexander, Wisniewski, John P., Osten, Rachel A., Vrijmoet, Eliot H., White, Graeme L., Carter, Brad D., Grady, Carol A., Henry, Todd J., Hinojosa, Rodrigo H., Lomax, Jamie R., Neff, James E., Paredes, Leonardo A. and Soutter, Jack. 2023. "A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect." The Astrophysical Journal: an international review of astronomy and astronomical physics. 951 (1). https://doi.org/10.3847/1538-4357/acc94f
| Article Title | A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect |
|---|---|
| ERA Journal ID | 1057 |
| Article Category | Article |
| Authors | Tristan, Isaiah I., Notsu, Yuta, Kowalski, Adam F., Brown, Alexander, Wisniewski, John P., Osten, Rachel A., Vrijmoet, Eliot H., White, Graeme L., Carter, Brad D., Grady, Carol A., Henry, Todd J., Hinojosa, Rodrigo H., Lomax, Jamie R., Neff, James E., Paredes, Leonardo A. and Soutter, Jack |
| Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
| Journal Citation | 951 (1) |
| Number of Pages | 33 |
| Year | 2023 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-637X |
| 1538-4357 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/acc94f |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/acc94f |
| Abstract | We present light curves and flares from a 7 day, multiwavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on 73 unique flares between the X-ray to optical data. We use high-time-resolution near-UV (NUV) photometry and soft X-ray (SXR) data from the X-ray Multi-Mirror Mission to study the empirical Neupert effect, which correlates the gradual and impulsive phase flaring emissions. We find that 65% (30 of 46) flares do not follow the Neupert effect, which is 3 times more excursions than seen in solar flares, and propose a four-part Neupert effect classification (Neupert, quasi-Neupert, non-Neupert types I and II) to explain the multiwavelength responses. While the SXR emission generally lags behind the NUV as expected from the chromospheric evaporation flare models, the Neupert effect is more prevalent in larger, more impulsive flares. Preliminary flaring rate analysis with X-ray and U-band data suggests that previously estimated energy ratios hold for a collection of flares observed over the same time period, but not necessarily for an individual, multiwavelength flare. These results imply that one model cannot explain all stellar flares and care should be taken when extrapolating between wavelength regimes. Future work will expand wavelength coverage using radio data to constrain the nonthermal empirical and theoretical Neupert effects to better refine models and bridge the gap between stellar and solar flare physics. |
| Keywords | Red dwarf flare stars (1367); Stellar activity (1580); Stellar flares (1603); Optical flares (1166); Stellar x-ray flares (1637); Planet hosting stars (1242) |
| ANZSRC Field of Research 2020 | 510199. Astronomical sciences not elsewhere classified |
| 510999. Space sciences not elsewhere classified | |
| Byline Affiliations | University of Colorado Boulder, United States |
| Tokyo Institute of Technology, Japan | |
| George Mason University, United States | |
| Space Telescope Science Institute, United States | |
| Georgia State University, United States | |
| International Institute of Rural Reconstruction, United States | |
| Centre for Astrophysics (Research) | |
| Centre for Astrophysics | |
| Eureka Scientific, United States | |
| Cerro Tololo Inter-American Observatory, Chile | |
| United States Naval Academy, United States | |
| National Science Foundation, United States | |
| Centre for Astrophysics (Operations) | |
| Institute for Advanced Engineering and Space Sciences (Operations) |
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https://research.usq.edu.au/item/z26zx/a-7-day-multiwavelength-flare-campaign-on-au-mic-i-high-time-resolution-light-curves-and-the-thermal-empirical-neupert-effect
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