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Simulating the Spac...
Simulating the Space Weather in the AU Mic System : Stellar Winds and Extreme Coronal Mass Ejections
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- Alvarado-Gomez, Julian D. (author)
- Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.
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- Cohen, Ofer (author)
- Univ Massachusetts, Dept Phys & Appl Phys, 600 Suffolk St, Lowell, MA 01854 USA.
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- Drake, Jeremy J. (author)
- Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
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- Fraschetti, Federico (author)
- Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.;Univ Arizona, Dept Planetary Sci, Lunar & Planetary Lab, Tucson, AZ 85721 USA.
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- Poppenhaeger, Katja (author)
- Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
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- Garraffo, Cecilia (author)
- Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
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- Chebly, Judy (author)
- Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
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- Ilin, Ekaterina (author)
- Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
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- Harbach, Laura (author)
- Imperial Coll London, Dept Phys, Astrophys Grp, Prince Consort Rd, London SW7 2AZ, England.
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- Kochukhov, Oleg (author)
- Uppsala universitet,Observationell astrofysik
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Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany Univ Massachusetts, Dept Phys & Appl Phys, 600 Suffolk St, Lowell, MA 01854 USA. (creator_code:org_t)
- 2022-04-04
- 2022
- English.
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In: Astrophysical Journal. - : IOP Publishing Ltd. - 0004-637X .- 1538-4357. ; 928:2
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Abstract
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- Two close-in planets have been recently found around the M-dwarf flare star AU Microscopii (AU Mic). These Neptune-sized planets (AU Mic b and c) seem to be located very close to the so-called "evaporation valley" in the exoplanet population, making this system an important target for studying atmospheric loss on exoplanets. This process, while mainly driven by high-energy stellar radiation, will be strongly mediated by the space environment surrounding the planets. Here we present an investigation of this last area, performing 3D numerical modeling of the quiescent stellar wind from AU Mic, as well as time-dependent simulations describing the evolution of a highly energetic coronal mass ejection (CME) event in this system. Observational constraints on the stellar magnetic field and properties of the eruption are incorporated in our models. We carry out qualitative and quantitative characterizations of the stellar wind, the emerging CMEs, as well as the expected steady and transient conditions along the orbit of both exoplanets. Our results predict extreme space weather for AU Mic and its planets. This includes sub-Alfvenic regions for the large majority of the exoplanet orbits, very high dynamic and magnetic pressure values in quiescence (varying within 10(2)-10(5) times the dynamic pressure experienced by Earth), and an even harsher environment during the passage of any escaping CME associated with the frequent flaring observed in AU Mic. These space weather conditions alone pose an immense challenge for the survival of exoplanetary atmospheres (if any) in this system.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- ref (subject category)
- art (subject category)
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Alvarado-Gomez, ...
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Cohen, Ofer
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Drake, Jeremy J.
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Fraschetti, Fede ...
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Poppenhaeger, Ka ...
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Garraffo, Cecili ...
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show more...
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Chebly, Judy
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Ilin, Ekaterina
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Harbach, Laura
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Kochukhov, Oleg
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NATURAL SCIENCES
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Uppsala University