LETO, P., C. TRIGILIO, Jiří KRTIČKA, L. FOSSATI, R. IGNACE, M. E. SHULTZ, C. S. BUEMI, L. CERRIGONE, G. UMANA, A. INGALLINERA, C. BORDIU, I. PILLITTERI, F. BUFANO, L. M. OSKINOVA, C. AGLIOZZO, F. CAVALLARO, S. RIGGI, S. LORU, H. TODT, M. GIARRUSSO, N. M. PHILLIPS, J. ROBRADE a F. LEONE. A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets. Monthly Notices of the Royal Astronomical Society. Oxford University Press, roč. 507, č. 2, s. 1979-1998. ISSN 0035-8711. doi:10.1093/mnras/stab2168. 2021.
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Základní údaje
Originální název A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets
Autoři LETO, P. (garant), C. TRIGILIO, Jiří KRTIČKA (203 Česká republika, domácí), L. FOSSATI, R. IGNACE, M. E. SHULTZ, C. S. BUEMI, L. CERRIGONE, G. UMANA, A. INGALLINERA, C. BORDIU, I. PILLITTERI, F. BUFANO, L. M. OSKINOVA, C. AGLIOZZO, F. CAVALLARO, S. RIGGI, S. LORU, H. TODT, M. GIARRUSSO, N. M. PHILLIPS, J. ROBRADE a F. LEONE.
Vydání Monthly Notices of the Royal Astronomical Society, Oxford University Press, 2021, 0035-8711.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 10308 Astronomy
Stát vydavatele Velká Británie a Severní Irsko
Utajení není předmětem státního či obchodního tajemství
WWW URL
Impakt faktor Impact factor: 5.235
Kód RIV RIV/00216224:14310/21:00122951
Organizační jednotka Přírodovědecká fakulta
Doi http://dx.doi.org/10.1093/mnras/stab2168
UT WoS 000697380800029
Klíčová slova anglicky magnetic reconnection; planets and satellites: magnetic fields; stars: early-type; stars: late-type; stars: magnetic field; radio continuum: stars
Štítky rivok
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Mgr. Marie Šípková, DiS., učo 437722. Změněno: 24. 11. 2021 12:10.
Anotace
In this paper, we present the analysis of incoherent non-thermal radio emission from a sample of hot magnetic stars, ranging from early-B to early-A spectral type. Spanning a wide range of stellar parameters and wind properties, these stars display a commonality in their radio emission which presents new challenges to the wind scenario as originally conceived. It was thought that relativistic electrons, responsible for the radio emission, originate in current sheets formed, where the wind opens the magnetic field lines. However, the true mass-loss rates from the cooler stars are too small to explain the observed non-thermal broad-band radio spectra. Instead, we suggest the existence of a radiation belt located inside the inner magnetosphere, similar to that of Jupiter. Such a structure explains the overall indifference of the broad-band radio emissions on wind mass-loss rates. Further, correlating the radio luminosities from a larger sample of magnetic stars with their stellar parameters, the combined roles of rotation and magnetic properties have been empirically determined. Finally, our sample of early-type magnetic stars suggests a scaling relationship between the non-thermal radio luminosity and the electric voltage induced by the magnetosphere’s co-rotation, which appears to hold for a broader range of stellar types with dipole-dominated magnetospheres (like the cases of the planet Jupiter and the ultracool dwarf stars and brown dwarfs). We conclude that well-ordered and stable rotating magnetospheres share a common physical mechanism for supporting the generation of non-thermal electrons.
VytisknoutZobrazeno: 29. 3. 2024 16:34