Results 11 to 20 of about 377,435 (259)
Estimate on Dust Scale Height from the ALMA Dust Continuum Image of the HD 163296 Protoplanetary Disk [PDF]
Astrophysical Journal, 2021 We aim at estimating the dust scale height of protoplanetary disks from millimeter continuum observations. First, we present a general expression of intensity of a ring in a protoplanetary disk and show that we can constrain the dust scale height by the ...
Kiyoaki Doi, A. Kataoka
semanticscholar +1 more source
Protoplanetary disk formation from the collapse of a prestellar core [PDF]
Astronomy & Astrophysics, 2021 Context. Between the two research communities that study star formation and protoplanetary disk evolution, only a few efforts have been made to understand and bridge the gap between studies of a collapsing prestellar core and a developed disk.
Yueh-Ning Lee, S. Charnoz, P. Hennebelle
semanticscholar +1 more source
Evidence for a Cosmic-Ray Gradient in the IM Lup Protoplanetary Disk [PDF]
Astrophysical Journal, 2021 Protoplanetary disk evolution is strongly impacted by ionization from the central star and local environment, which collectively have been shown to drive chemical complexity and are expected to impact the transport of disk material.
R. Seifert +3 more
semanticscholar +1 more source
A New Method for Direct Measurement of Isotopologue Ratios in Protoplanetary Disks: A Case Study of the 12CO/13CO Ratio in the TW Hya Disk [PDF]
Astrophysical Journal, 2022 Planetary systems are thought to be born in protoplanetary disks. Isotope ratios are a powerful tool for investigating the material origin and evolution from molecular clouds to planetary systems via protoplanetary disks.
T. Yoshida +4 more
semanticscholar +1 more source
A Multifrequency ALMA Characterization of Substructures in the GM Aur Protoplanetary Disk [PDF]
Astrophysical Journal, 2020 The protoplanetary disk around the T Tauri star GM Aur was one of the first hypothesized to be in the midst of being cleared out by a forming planet. As a result, GM Aur has had an outsized influence on our understanding of disk structure and evolution ...
Jane Huang +14 more
semanticscholar +1 more source
Finding Substructures in Protostellar Disks in Ophiuchus
The Astronomical Journal, 2023 High-resolution, millimeter observations of disks at the protoplanetary stage reveal substructures such as gaps, rings, arcs, spirals, and cavities. While many protoplanetary disks host such substructures, only a few at the younger protostellar stage ...
Arnaud Michel +7 more
doaj +1 more source
Chemistry in Protoplanetary Disks [PDF]
Chemical Reviews, 2013 This comprehensive review summarizes our current understanding of the evolution of gas, solids and molecular ices in protoplanetary disks. Key findings related to disk physics and chemistry, both observationally and theoretically, are highlighted.
Dmitry Semenov, Thomas Henning
openaire +4 more sources
Observations of Protoplanetary Disk Structures [PDF]
, 2020 The disks that orbit young stars are the essential conduits and reservoirs of material for star and planet formation. Their structures, meaning the spatial variations of the disk physical conditions, reflect the underlying mechanisms that drive those ...
S. Andrews
semanticscholar +1 more source
Rapid Evolution of Volatile CO from the Protostellar Disk Stage to the Protoplanetary Disk Stage [PDF]
Astrophysical Journal, 2020 Recent observations show that the CO gas abundance, relative to H2, in many 1–10 Myr old protoplanetary disks may be heavily depleted by a factor of 10–100 compared to the canonical interstellar medium (ISM) value of 10−4.
Ke Zhang, K. Schwarz, E. Bergin
semanticscholar +1 more source
Photoprocesses in protoplanetary disks [PDF]
Faraday Discussions, 2006 Circumstellar disks are exposed to intense ultraviolet radiation from the young star. In the inner disks, the UV radiation can be enhanced by more than seven orders of magnitude compared with the average interstellar field, resulting in a physical and chemical structure that resembles that of a dense photon-dominated region (PDR). This intense UV field
Marc C. van Hemert +2 more
openaire +4 more sources