Hydrogen ENA-cloud observation and modeling as a tool to study star-exoplanet interaction |
| |
| Authors: | Email author" target="_blank">H?LammerEmail author K?G?Kislyakova M?Holmstr?m M?L?Khodachenko J-M?Grie?meier |
| |
| Institution: | (1) Swedish Institute of Space Physics, PO Box 812, SE-981 28 Kiruna, Sweden |
| |
| Abstract: | During the previous years spacecraft observations of so-called Energetic Neutral Atoms (ENAs) have become an important remote-sensing
technique in planetary science for analyzing the solar wind plasma flow around the upper atmospheric environments of Solar
System bodies. ENAs are produced whenever solar- or stellar wind protons interact via charge exchange with a neutral particle
from a planetary atmosphere so that their signals constrain both, ion distributions and neutral gas densities. The observation
of ENAs which have been generated due to charge exchange with stellar wind plasma have been used for the indirect mass loss
and stellar wind property estimation of Sun-like stars by observing the interaction regions carved out by the collisions between
stellar winds and the interstellar medium. In this work we review ENA-observations and data interpretations at Solar System
planets and recent hydrogen-cloud observations in UV Lyman-α absorption around hydrogen-rich extra-solar gas giants. We discuss the production of stellar wind related hydrogen ENA-clouds
around close-in exoplanets and show how a detailed analysis of attenuation spectra obtained for transiting hydrogen-rich close-in
gas giants can be used for the study of the upper atmosphere structure, the planet’s magnetosphere and to obtain information
on stellar wind properties. Finally, we discuss how future hydrogen cloud observations around exoplanets by space observatories
like the Russia-led World Space Observatory-UV (WSO-UV) together with ESAs planned PLATO mission can be used for the reconstruction
of the solar wind history or the test of magnetosphere evolution hypotheses. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
