Slowly Varying Component of Radio Emission from TVLM 513-46546 and Continuous Sources of High Energy Electrons in the Coronae of UltraCool Stars
It is shown that a source generating a slowly varying or quiet component of radio emission from ultracool stars such as the brown dwarf TVLM 513-46546 can be the gyrosynchroton radiation from the magnetic loops system distributed quasi-uniformly over the star’s surface. Such a model explains the low modulation of the flux and makes it possible to understand the pumping mechanism of magnetic loops by high energy electrons. The main parameters of magnetic loops and which part of the star’s surface is the emission source are determined using the information on microwave radiation from the brown dwarf TVLM 513-46546.
The work was supported by the Russian Academy of Sciences, program no. 28, “Space: Fundamental Processes and their Interconnections,” by the Russian Science Foundation, project no. 16-12-10448 (chapters 1, 2), no. 16-12-10528 (chapter 3), by the Russian Foundation for Basic Research, project no. 17-02-00091a (chapter 4), and by a state contract, project no. 0035-2014-0029.
- 1.Berger, E., Gizis, J.E., Giampapa, M.S., Rutledge, R.E., Liebert, J., Martin, E., Basri, G., Fleming, T.A., Johns-Krull, C.M., Phan-Bao, N., and Sherry, W.H., Simultaneous multiwavelength observations of magnetic activity in ultracool dwarfs. I. The complex behavior of the M8.5 dwarf TVLM 513-46546, Astrophys. J., 2008, vol. 673, pp. 1080–1087.CrossRefGoogle Scholar
- 2.Dulk, G.A., Radio emission from the Sun and stars, Ann. Rev. Astron. Astrophys., 1985, vol. 23, pp. 169–224.Google Scholar
- 8.White, S.M., Kundu, M.R., and Jackson, P.D., Simple non-thermal models for the quiescent radio emission of dMe flare stars, Astron. Astrophys., 1989, vol. 225, pp. 112–124.Google Scholar
- 10.Zaitsev, V.V., Sustained oscillations of electric current in coronal magnetic loops and in arcades of magnetic loops, Solnechnaya i Solnenchno–Zemnaya Fizika-2017: Trudy GAO RAN (Solar and Solar–Terrestrial Physics: Proceedings of Main Astronomical Observatory RAS), St. Petersburg, 2017, pp. 153–156.Google Scholar