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Radial-velocity Searches for Planets Around Active Stars

2016-07-18 Science
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Release : 2016-07-18
Genre : Science
Kind : eBook
Book Rating : 736/5 ( reviews)

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Book Synopsis Radial-velocity Searches for Planets Around Active Stars by : Raphaëlle D. Haywood

Download or read book Radial-velocity Searches for Planets Around Active Stars written by Raphaëlle D. Haywood. This book was released on 2016-07-18. Available in PDF, EPUB and Kindle. Book excerpt: This thesis develops new and powerful methods for identifying planetary signals in the presence of “noise” generated by stellar activity, and explores the physical origin of stellar intrinsic variability, using unique observations of the Sun seen as a star. In particular, it establishes that the intrinsic stellar radial-velocity variations mainly arise from suppression of photospheric convection by magnetic fields. With the advent of powerful telescopes and instruments we are now on the verge of discovering real Earth twins in orbit around other stars. The intrinsic variability of the host stars themselves, however, currently remains the main obstacle to determining the masses of such small planets. The methods developed here combine Gaussian-process regression for modeling the correlated signals arising from evolving active regions on a rotating star, and Bayesian model selection methods for distinguishing genuine planetary signals from false positives produced by stellar magnetic activity. The findings of this thesis represent a significant step towards determining the masses of potentially habitable planets orbiting Sun-like stars.

Living around Active Stars (IAU S328)

2017-10-12 Science
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Release : 2017-10-12
Genre : Science
Kind : eBook
Book Rating : 056/5 ( reviews)

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Book Synopsis Living around Active Stars (IAU S328) by : Dibyendu Nandy

Download or read book Living around Active Stars (IAU S328) written by Dibyendu Nandy. This book was released on 2017-10-12. Available in PDF, EPUB and Kindle. Book excerpt: The variable activity of stars such as the Sun is mediated through stellar magnetic fields, radiative and energetic particle fluxes, stellar winds and magnetic storms manifested as stellar flares and coronal mass ejections. This activity influences planetary atmospheres, climate and habitability: on the one hand it drives life-sustaining processes on planets, but on the other hand can adversely impact planetary environments rendering them uninhabitable. Studies of this intimate relationship between the parent star, its astrosphere and the planets that it hosts have reached a certain level of maturity in our own Solar System. Based on this understanding, the first attempts are being made to characterize the interactions between distant stars and their planets and understand their coupled evolution, which is relevant for the search for habitable exoplanets. IAU Symposium 328 brings together diverse, interdisciplinary reviews and research papers which address the themes of star-planet interactions and habitability.

Heliophysics: Active Stars, their Astrospheres, and Impacts on Planetary Environments

2016-03-17 Science
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Release : 2016-03-17
Genre : Science
Kind : eBook
Book Rating : 474/5 ( reviews)

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Book Synopsis Heliophysics: Active Stars, their Astrospheres, and Impacts on Planetary Environments by : Carolus J. Schrijver

Download or read book Heliophysics: Active Stars, their Astrospheres, and Impacts on Planetary Environments written by Carolus J. Schrijver. This book was released on 2016-03-17. Available in PDF, EPUB and Kindle. Book excerpt: Taking an interdisciplinary approach, this book explores what makes the conditions on Earth 'just right' to sustain life.

Living Around Active Stars

2017 Habitable planets
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Release : 2017
Genre : Habitable planets
Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Living Around Active Stars by : International Astronomical Union. Symposium

Download or read book Living Around Active Stars written by International Astronomical Union. Symposium. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt: "The variable activity of stars such as the Sun is mediated through stellar magnetic fields, radiative and energetic particle fluxes, stellar winds, and magnetic storms manifested as stellar flares and coronal mass ejections. This activity influences planetary atmospheres, climate and habitability: on the one hand it drives life-sustaining processes on planets, but on the other hand can adversely impact planetary environments rendering them uninhabitable. Studies of this intimate relationship between the parent star, its astrosphere and the planets that it hosts have reached a certain level of maturity in our own Solar System. Based on this understanding, the first attempts are being made to characterize the interactions between distant stars and their planets and understand their coupled evolution, which is relevant for the search for habitable exoplanets. IAU Symposium 328 brings together diverse, interdisciplinary reviews and research papers which address the themes of star-planet interactions and habitability."-- Publisher's description.

Host Stars and their Effects on Exoplanet Atmospheres

2019-05-23 Science
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Release : 2019-05-23
Genre : Science
Kind : eBook
Book Rating : 52X/5 ( reviews)

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Book Synopsis Host Stars and their Effects on Exoplanet Atmospheres by : Jeffrey Linsky

Download or read book Host Stars and their Effects on Exoplanet Atmospheres written by Jeffrey Linsky. This book was released on 2019-05-23. Available in PDF, EPUB and Kindle. Book excerpt: 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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