EAN: 9783030114510

HOST STARS AND THEIR EFFECTS ON EXOPLANET ATMOS...

Like planets in our solar system  exoplanets form  evolve  and interact with their host stars
in many ways. As exoplanets acquire material and grow to the final size  their atmospheres are
subjected to intense UV and X-radiation and high-energy particle bombardment from the young
host star. Whether a planet can retain its atmosphere and the conditions for significant mass
loss both depend upon the strength of the host star's high-energy radiation and wind  the
distance of the exoplanet from its host star  the gravitational potential of the exoplanet  and
the initial chemical composition of the exoplanet atmosphere. This introductory overview
describes the physical processes responsible for the emission of radiation and acceleration of
winds of host stars that together control the environment of an exoplanet  focusing on topics
that are critically important for understanding exoplanetary atmospheres but are usually not
posed from the perspective of host stars. Accordingly  both host stars and exoplanets are not
studied in isolation but are treated as integrated systems. Stellar magnetic fields  which are
the energy source for activity phenomena including high-energy radiation and winds  play a
critical role in determining whether exoplanets are habitable. This text is primarily for
researchers and graduate students who are studying exoplanet atmospheres and habitability  but
who may not have a background in the physics and phenomenology of host stars that provide the
environment in which exoplanets evolve. It provides a comprehensive overview of this broad
topic rather than going deeply into many technical aspects but includes a large list of
references to guide those interested in pursuing these questions. Nonspecialists with a
scientific background should also find this text a valuable resource for understanding the
critical issues of contemporary exoplanet research.

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