Stellar wind regimes of close-in extrasolar planets
Open accessAbstract
Close-in extrasolar planets of Sun-like stars are exposed to stellar wind conditions that differ considerably from those for planets in the solar system. Unfortunately, these stellar winds belong to the still unknown parameters of these planetary systems. On the other hand, they play a crucial role in a number of star-planet interaction processes that may lead to observable radiation events. In order to lay a foundation for the investigation of such interaction processes, we estimate stellar wind parameters on the basis of the solar wind model by Weber & Davis and study the implications of the stellar magnetic fields. Our results suggest that in contrast to the solar system planets, some close-in extrasolar planets may be obstacles in a sub-Alfvénic stellar wind flow. In this case, the stellar wind magnetic pressure is comparable to or even larger than the dynamic flow pressure. We discuss possible consequences of these findings for the wind–exoplanet interactions. Further, we derive upper limit estimates for the energies such stellar winds can deposit in the exoplanetary magnetospheres. We finally discuss the implications the sub-Alfvénic environment may have on the star–planet interaction.
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Stellar winds scale to magnetic fields and activity.
“Since stellar winds scale to magnetic fields and activity (e.g., Schrijver et al. 2003; Preusse et al. 2005; Cranmer & Saar 2011)”
From ABOUT EXOBIOLOGY: THE CASE FOR DWARF K STARS (2016) · cites this paper as Preusse et al. 2005
Section 3.2 (page unavailable) varies magnetic-field strength to study its influence on stellar-wind velocities, supporting the magnetic-field part of the claim. The paper does not establish that stellar winds scale with stellar activity; its discussion of activity in the Introduction concerns possible effects of star–planet interaction. (LLM, conf=0.84)
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ABOUT EXOBIOLOGY: THE CASE FOR DWARF K STARS
Cuntz, M., & Guinan, E. F. (2016) · The Astrophysical Journal · doi:10.3847/0004-637x/827/1/79 · Cited by 77 · see citing works
“Since stellar winds scale to magnetic fields and activity (e.g., Schrijver et al. 2003; Preusse et al. 2005; Cranmer & Saar 2011), it can be assumed that winds are most dense in young, magnetically active stars and planets at close-in HTDs (as given for late-K and M dwarfs) are most affected.”
Background
- Authors
- Preusse, S., Kopp, A., Büchner, J., & Motschmann, U.
- Affiliations
- Max Planck Society (DE)
- Technische Universität Braunschweig (DE)
- Venue
- Astronomy & Astrophysics
- Publisher
- EDP Sciences
- Published
- 2005-04-18
- Volume
- 434
- Issue
- 3
- Pages
- 1191-1200
- ISSN
- 0004-6361 (ISSN-L)
- 1432-0746
- OpenAlex
- W2062679170
- Cited by
- 76
- References
- 35
- Citations by year
- 2026: 1 · 2024: 4 · 2023: 2 · 2022: 1 · 2021: 4 · 2020: 4 · 2019: 3 · 2018: 6 · 2017: 5 · 2016: 2 · 2015: 2 · 2014: 2 · 2013: 6
- FWCI
- 3.30
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Astronomy and Astrophysics (publishedVersion)
- Springer Link (Chiba Institute of Technology) (submittedVersion)
- Max Planck Institute for Plasma Physics (submittedVersion)
- Max Planck Digital Library (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- Funders
- International Max Planck Research School for Environmental, Cellular and Molecular Microbiology
- Max-Planck-Gesellschaft
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Solar and Space Plasma Dynamics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Ionosphere and magnetosphere dynamics
- Keywords
- stellar winds, close-in exoplanets, star-planet interaction, stellar magnetic fields, sub-Alfvénic flow, exoplanet magnetospheres, solar-type stars
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