{"title":"Magnetic Exoplanets in the Subalvenic Stellar Wind: Collimators of the Interplanetary Magnetic Field","authors":"E. S. Belenkaya","doi":"10.1134/S0038094624601737","DOIUrl":null,"url":null,"abstract":"<p>Many exoplanets have been discovered very close to their parent stars. The radius of their orbits relative to the Alfvén radius and the characteristics of the parent star determine the mode of flow of the stellar wind around these planets: sub-Alfvénic or super-Alfvénic. The distance from the center of the star at which the kinetic and magnetic energy densities are equal is called the Alfvén radius. If a magnetic exoplanet is located beyond this distance, a comet-like magnetosphere with a bow shock in front of it forms around it. If the exoplanet is located inside the Alfvén radius, the magnetosphere turns into Alfvén wings. Here we will consider how the transition from a comet-like magnetosphere to Alfvén wings occurs due to the growth of the magnetic field of the stellar wind with the most efficient orientation for reconnection and how, due to this process, the bundle of open field lines in interplanetary space is transformed, compressed into a narrow tube.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":"59 5","pages":""},"PeriodicalIF":0.6000,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solar System Research","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S0038094624601737","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
Many exoplanets have been discovered very close to their parent stars. The radius of their orbits relative to the Alfvén radius and the characteristics of the parent star determine the mode of flow of the stellar wind around these planets: sub-Alfvénic or super-Alfvénic. The distance from the center of the star at which the kinetic and magnetic energy densities are equal is called the Alfvén radius. If a magnetic exoplanet is located beyond this distance, a comet-like magnetosphere with a bow shock in front of it forms around it. If the exoplanet is located inside the Alfvén radius, the magnetosphere turns into Alfvén wings. Here we will consider how the transition from a comet-like magnetosphere to Alfvén wings occurs due to the growth of the magnetic field of the stellar wind with the most efficient orientation for reconnection and how, due to this process, the bundle of open field lines in interplanetary space is transformed, compressed into a narrow tube.
期刊介绍：
Solar System Research publishes articles concerning the bodies of the Solar System, i.e., planets and their satellites, asteroids, comets, meteoric substances, and cosmic dust. The articles consider physics, dynamics and composition of these bodies, and techniques of their exploration. The journal addresses the problems of comparative planetology, physics of the planetary atmospheres and interiors, cosmochemistry, as well as planetary plasma environment and heliosphere, specifically those related to solar-planetary interactions. Attention is paid to studies of exoplanets and complex problems of the origin and evolution of planetary systems including the solar system, based on the results of astronomical observations, laboratory studies of meteorites, relevant theoretical approaches and mathematical modeling. Alongside with the original results of experimental and theoretical studies, the journal publishes scientific reviews in the field of planetary exploration, and notes on observational results.
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