A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets Get access Arrow
| Author(s) | Leto, P. | |
| Author(s) | Trigilio, C. | |
| Author(s) | Krtička, J. | |
| Author(s) | Fossati, L. | |
| Author(s) | Ignace, R. | |
| Author(s) | Shultz, M. E. | |
| Author(s) | Buemi, C. S. | |
| Author(s) | Cerrigone, L. | |
| Author(s) | Umana, G. | |
| Author(s) | Ingallinera, A. | |
| Author(s) | Bordiu, C. | |
| Author(s) | Pillitteri, I. | |
| Author(s) | Bufano, F. | |
| Author(s) | Oskinova, L. M. | |
| Author(s) | Agliozzo, C. | |
| Author(s) | Cavallaro, F. | |
| Author(s) | Riggi, S. | |
| Author(s) | Loru, S. | |
| Author(s) | Todt, H. | |
| Author(s) | Giarrusso, M. | |
| Author(s) | Phillips, N. M. | |
| Author(s) | Robrade, J. | |
| Author(s) | Leone, F. | |
| Date Accessioned | 2022-06-24T17:36:00Z | |
| Date Available | 2022-06-24T17:36:00Z | |
| Publication Date | 2021-07-28 | |
| Description | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved. The version of record is available at: https://doi.org/10.1093/mnras/stab2168 | en_US |
| Abstract | 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. | en_US |
| Sponsor | We sincerely thank the anonymous referee for his/her very useful and constructive criticisms and suggestions. This work has extensively used the NASA’s Astrophysics Data System, and the SIMBAD data base, operated at CDS, Strasbourg, France. LMO acknowledges support from the Deutsches Zentrum fur Luft und Raumfahrt (DLR) under grant no. FKZ 50OR1809 and partial support by the Russian Government Program of Competitive Growth of Kazan Federal University. FL was supported by ‘Programma ricerca di ateneo Universit`a degli Studi di Catania (UNICT) 2020-22 linea 2’. RI acknowledges funding support for this research from a grant by the National Science Foundation, AST-2009412. MG acknowledges financial contribution from the agreement Agenzia Spaziale Italiana (ASI)-Istituto Nazionale di Astrofisica (INAF) no. 2018-16-HH.0. MES acknowledges financial support from the Annie Jump Cannon Fellowship, supported by the University of Delaware and endowed by the Mount Cuba Astronomical Observatory. A special thanks to the project MOSAICo (Metodologie Open Source per l’Automazione Industriale e delle procedure di CalcOlo in astrofisica) funded by Italian MISE (Ministero Sviluppo Economico). | en_US |
| Citation | P Leto, C Trigilio, J 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, 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, Volume 507, Issue 2, October 2021, Pages 1979–1998, https://doi.org/10.1093/mnras/stab2168 | en_US |
| ISSN | 1365-2966 | |
| URL | https://udspace.udel.edu/handle/19716/31027 | |
| Language | en_US | en_US |
| Publisher | Monthly Notices of the Royal Astronomical Society | en_US |
| Keywords | magnetic reconnection | en_US |
| Keywords | planets and satellites: magnetic fields | en_US |
| Keywords | stars: early-type | en_US |
| Keywords | stars: late-type | en_US |
| Keywords | stars: magnetic field | en_US |
| Keywords | radio continuum: stars | en_US |
| Title | A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets Get access Arrow | en_US |
| Type | Article | en_US |
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