Low-frequency monitoring of flare star binary CR Draconis::Long-term electron-cyclotron maser emission
| العنوان: | Low-frequency monitoring of flare star binary CR Draconis::Long-term electron-cyclotron maser emission |
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| المؤلفون: | Joseph R. Callingham, K. C. Veken, Harish Vedantham, J. Sabater, H. J. A. Röttgering, Timothy W. Shimwell, Cyril Tasse, S. E. B. Toet, Adina D. Feinstein, R. J. van Weeren, Philippe Zarka, T. P. Ray, Benjamin J. S. Pope, L. Lamy, Philip Best |
| المساهمون: | Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Astronomy |
| المصدر: | Callingham, J R, Pope, B J S, Feinstein, A D, Vedantham, H K, Shimwell, T W, Zarka, P, Tasse, C, Lamy, L, Veken, K, Toet, S, Sabater, J, Best, P N, Weeren, R J V, Röttgering, H J A & Ray, T P 2021, ' Low-frequency monitoring of flare star binary CR Draconis: Long-term electron-cyclotron maser emission ', Astronomy and Astrophysics, vol. 648, A13, pp. 1-15 . https://doi.org/10.1051/0004-6361/202039144 Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 648, pp.A13. ⟨10.1051/0004-6361/202039144⟩ Astronomy & Astrophysics Astronomy and astrophysics, 648:A13. EDP Sciences Astronomy and Astrophysics, 648 |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Rotation period, Stars, Stars: Individual, Solar System, astro-ph.SR, 010504 meteorology & atmospheric sciences, Radio Continuum, Gas giant, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Spectral line, law.invention, Jupiter, CR Draconis Astrophysics, law, stars: low-mass, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Solar and Stellar Astrophysics, Maser, Low-Mass, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Physics, Earth and Planetary Astrophysics (astro-ph.EP), Flare star, Astronomy and Astrophysics, Stars, 3. Good health, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Stars: Individual, Brightness temperature, astro-ph.EP, stars: individual: CR Draconis, Earth and Planetary Astrophysics, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], radio continuum: stars, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | Recently detected coherent low-frequency radio emission from M dwarf systems shares phenomenological similarities with emission produced by magnetospheric processes from the gas giant planets of our Solar System. Such beamed electron-cyclotron maser emission can be driven by a star-planet interaction or a breakdown in co-rotation between a rotating plasma disk and a stellar magnetosphere. Both models suggest that the radio emission could be periodic. Here we present the longest low-frequency interferometric monitoring campaign of an M dwarf system, composed of twenty-one $\approx$8 hour epochs taken in two series of observing blocks separated by a year. We achieved a total on-source time of 6.5 days. We show that the M dwarf binary CR Draconis has a low-frequency 3$\sigma$ detection rate of 90$^{+5}_{-8}$% when a noise floor of $\approx$0.1 mJy is reached, with a median flux density of 0.92 mJy, consistent circularly polarised handedness, and a median circularly polarised fraction of 66%. We resolve three bright radio bursts in dynamic spectra, revealing the brightest is elliptically polarised, confined to 4 MHz of bandwidth centred on 170 MHz, and reaches a flux density of 205 mJy. The burst structure is mottled, indicating it consists of unresolved sub-bursts. Such a structure shares a striking resemblance with the low-frequency emission from Jupiter. We suggest the near-constant detection of high brightness temperature, highly-circularly-polarised radiation that has a consistent circular polarisation handedness implies the emission is produced via the electron-cyclotron maser instability. Optical photometric data reveal the system has a rotation period of 1.984$\pm$0.003 days. We observe no periodicity in the radio data, but the sampling of our radio observations produces a window function that would hide the near two-day signal. Comment: Accepted for publication in A&A, 16 pages, 7 figures, 2 tables |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0004-6361 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ba86b6bba5c799b029516c1c29d5e4c https://hdl.handle.net/20.500.11820/1e26546b-9f80-4dbf-bcbe-cb5369e5d16b |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....7ba86b6bba5c799b029516c1c29d5e4c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00046361 |
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