A scaling relationship for non-thermal radio emission from
ordered magnetospheres: from the top of the main sequence to
planets

J 2021

A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets

LETO, P., C. TRIGILIO, Jiří KRTIČKA, L. FOSSATI, R. IGNACE et. al.

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

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

Odkazy

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

Změněno: 24. 11. 2021 12:10, Mgr. Marie Šípková, DiS.

Anotace

V originále

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.

Citovat

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, 2021, roč. 507, č. 2, s. 1979-1998. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stab2168.

@article{1804900,
   author = {Leto, P. and Trigilio, C. and Krtička, Jiří and Fossati, L. and Ignace, R. and Shultz, M. E. and Buemi, C. S. and Cerrigone, L. and Umana, G. and Ingallinera, A. and Bordiu, C. and Pillitteri, I. and Bufano, F. and Oskinova, L. M. and Agliozzo, C. and Cavallaro, F. and Riggi, S. and Loru, S. and Todt, H. and Giarrusso, M. and Phillips, N. M. and Robrade, J. and Leone, F.},
   article_number = {2},
   doi = {http://dx.doi.org/10.1093/mnras/stab2168},
   keywords = {magnetic reconnection; planets and satellites: magnetic fields; stars: early-type; stars: late-type; stars: magnetic field; radio continuum: stars},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets},
   url = {https://academic.oup.com/mnras/article/507/2/1979/6329691},
   volume = {507},
   year = {2021}
}

TY  - JOUR
ID  - 1804900
AU  - Leto, P. - Trigilio, C. - Krtička, Jiří - Fossati, L. - Ignace, R. - Shultz, M. E. - Buemi, C. S. - Cerrigone, L. - Umana, G. - Ingallinera, A. - Bordiu, C. - Pillitteri, I. - Bufano, F. - Oskinova, L. M. - Agliozzo, C. - Cavallaro, F. - Riggi, S. - Loru, S. - Todt, H. - Giarrusso, M. - Phillips, N. M. - Robrade, J. - Leone, F.
PY  - 2021
TI  - A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 507
IS  - 2
SP  - 1979-1998
EP  - 1979-1998
PB  - Oxford University Press
SN  - 00358711
KW  - magnetic reconnection
KW  - planets and satellites: magnetic fields
KW  - stars: early-type
KW  - stars: late-type
KW  - stars: magnetic field
KW  - radio continuum: stars
UR  - https://academic.oup.com/mnras/article/507/2/1979/6329691
N2  - 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.
ER  -

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. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2021, roč.~507, č.~2, s.~1979-1998. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stab2168.

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