Planet-induced radio emission from the coronae of M dwarfs: the case of Prox Cen and AU Mic

Autor: Robert D. Kavanagh, Baptiste Klein, Aline A. Vidotto, Moira Jardine, Jean-François Donati, Dúalta Ó Fionnagáin
Přispěvatelé: University of St Andrews. School of Physics and Astronomy, Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Star (game theory)
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Flux
Astrophysics
Electron
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
7. Clean energy
Instability
law.invention
planetary systems [Radio continuum]
law
Planet
0103 physical sciences
QB Astronomy
Astrophysics::Solar and Stellar Astrophysics
winds
outflows [Stars]
Maser
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
QC
Astrophysics::Galaxy Astrophysics
QB
Earth and Planetary Astrophysics (astro-ph.EP)
Physics
mass-loss [Stars]
AU Microscopii
010308 nuclear & particles physics
Astronomy and Astrophysics
3rd-DAS
Corona
magnetic field [Stars]
Stars
QC Physics
Astrophysics - Solar and Stellar Astrophysics
[SDU]Sciences of the Universe [physics]
13. Climate action
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
individual: Proxima Centauri [Stars]
Astrophysics - Earth and Planetary Astrophysics
Zdroj: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 504 (1), pp.1511-1518. ⟨10.1093/mnras/stab929⟩
Monthly Notices of the Royal Astronomical Society, 2021, 504 (1), pp.1511-1518. ⟨10.1093/mnras/stab929⟩
ISSN: 0035-8711
1365-2966
DOI: 10.1093/mnras/stab929⟩
Popis: There have recently been detections of radio emission from low-mass stars, some of which are indicative of star-planet interactions. Motivated by these exciting new results, in this paper we present Alfv\'en wave-driven stellar wind models of the two active planet-hosting M dwarfs Prox Cen and AU Mic. Our models incorporate large-scale photospheric magnetic field maps reconstructed using the Zeeman-Doppler Imaging method. We obtain a mass-loss rate of $0.25~\dot{M}_{\odot}$ for the wind of Prox Cen. For the young dwarf AU Mic, we explore two cases: a low and high mass-loss rate. Depending on the properties of the Alfv\'en waves which heat the corona in our wind models, we obtain mass-loss rates of $27$ and $590~\dot{M}_{\odot}$ for AU Mic. We use our stellar wind models to assess the generation of electron cyclotron maser instability emission in both systems, through a mechanism analogous to the sub-Alfv\'enic Jupiter-Io interaction. For Prox Cen we do not find any feasible scenario where the planet can induce radio emission in the star's corona, as the planet orbits too far from the star in the super-Alfv\'enic regime. However, in the case that AU Mic has a stellar wind mass-loss rate of $27~\dot{M}_{\odot}$, we find that both planets b and c in the system can induce radio emission from $\sim10$ MHz to 3 GHz in the corona of the host star for the majority of their orbits, with peak flux densities of $\sim10$ mJy. Detection of such radio emission would allow us to place an upper limit on the mass-loss rate of the star.
Comment: 8 pages, 5 figures. Accepted for publication in MNRAS
Databáze: OpenAIRE
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