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Protostars --- Planets --- Molecular clouds --- Stars --- Origin --- Formation

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

star formation --- magnetic fields --- inter-stellar medium --- molecular clouds --- protostars --- circumstellar disks

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This book characterizes the kinematic and chemical structures of disk-forming regions around low-mass protostellar sources and their interplay based on Atacama Large Millimeter/submillimeter Array (ALMA) observations. It describes the chemical evolution of molecules formed in an interstellar gas using the ALMA observations of 5 Sun-like protostars at a spatial resolution of a few tens au scale, which unveils the physical mechanism of star and planetary formation. The book reviews the author's successful works, focusing on two key findings: (i) A drastic change in the chemical composition of the gas around the centrifugal barrier of the infalling-rotating envelopes, and (ii) the chemical composition in the disk-forming regions, which varies from source to source depending on the chemical characteristics of the parent molecular cloud. These findings are based on the fine characterization of physical structures based on careful kinematic analyses. An additional attraction is the inclusion of the skillful reviews of ALMA observatory and its observation and physical models to describe the observed gas structure.

Space research --- Astrophysics --- Astronomy --- Physicochemistry --- Chemical structure --- Molecular biology --- spectra (chemie) --- moleculaire structuur --- astrofysica --- ruimte (astronomie) --- astronomie --- fysicochemie --- atoomstructuur --- Protostars.

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Astrophysics --- Astrophysique --- Astrophysics. --- Pulsars --- White dwarfs --- Nebulae(Planetary-) --- Stars(Redgiant-) --- Neutron stars --- Supernovae --- Galaxies --- Novae --- Stars formation --- Stars(Variable-) --- Protostars --- Stars physics

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Protostars --- Planetology --- Meteorites --- Planetary science --- 523.4 --- 523.4 Planets and their satellites. Planetology --- Planets and their satellites. Planetology --- Stars --- Planetary sciences --- Meteors