Results 31 to 40 of about 377,435 (259)
2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules [PDF]
Astrophysical Journal Supplement Series, 2018 To date, 204 individual molecular species, comprised of 16 different elements, have been detected in the interstellar and circumstellar medium by astronomical observations.
B. McGuire
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Photoevaporation of Protoplanetary Disks [PDF]
The Astrophysical Journal, 2008 We present HST/NICMOS Paschen alpha images and low and high resolution IRS spectra of photoevaporating disk-tail systems originally detected at 24 micron near O stars. We find no Paschen alpha emission in any of the systems. The resulting upper limits correspond to about 0.000002-0.000003 solar mass of mass in hydrogen in the tails suggesting that the ...
George H. Rieke +7 more
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Kinematic detection of a planet carving a gap in a protoplanetary disk [PDF]
Nature Astronomy, 2019 We still do not understand how planets form or why extrasolar planetary systems are so different from our own Solar System. However, the past few years have dramatically changed our view of the disks of gas and dust around young stars.
C. Pinte +14 more
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Protoplanetary Disks as (Possibly) Viscous Disks [PDF]
The Astrophysical Journal, 2017 Abstract Protoplanetary disks are believed to evolve on megayear timescales in a diffusive (viscous) manner as a result of angular momentum transport driven by internal stresses. Here we use a sample of 26 protoplanetary disks resolved by ALMA with measured (dust-based) masses and stellar accretion rates to derive the dimensionless α ...
Roman R. Rafikov, Roman R. Rafikov
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The First Detection of 13C17O in a Protoplanetary Disk: A Robust Tracer of Disk Gas Mass [PDF]
Astrophysical Journal, 2019 Measurements of the gas mass are necessary to determine the planet formation potential of protoplanetary disks. Observations of rare CO isotopologues are typically used to determine disk gas masses; however, if the line emission is optically thick this ...
A. Booth +6 more
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Dust evolution in protoplanetary disks [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractWe investigate the behaviour of dust in protoplanetary disks under the action of gas drag using our 3D, two-fluid (gas+dust) SPH code. We present the evolution of the dust spatial distribution in global simulations of planetless disks as well as of disks containing an already formed planet.
Gonzalez, Jean-François +3 more
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Protoplanetary Disk Rings and Gaps across Ages and Luminosities [PDF]
Astrophysical Journal, 2019 Since the discovery of the multiring structure of the HL Tau disk, ALMA data suggest that the dust continuum emission of many, if not all, protoplanetary disks consists of rings and gaps, no matter their spectral type or age.
N. van der Marel +4 more
semanticscholar +1 more source
A numerical approach to model chemistry of complex organic molecules in a protoplanetary disk
Open Astronomy, 2022 Multiphase astrochemical modeling presents a numerical challenge especially for the simulation of objects with the wide range of physical parameters such as protoplanetary disks.
Kiskin Mikhail Yu. +2 more
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The Dispersal of Protoplanetary Disks [PDF]
, 2014 Protoplanetary disks are the sites of planet formation, and the evolution and eventual dispersal of these disks strongly influences the formation of planetary systems. Disk evolution during the planet-forming epoch is driven by accretion and mass-loss due to winds, and in typical environments photoevaporation by high-energy radiation from the central ...
Alexander, Richard +4 more
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Ionization and heating by X-rays and cosmic rays*
EPJ Web of Conferences, 2015 High-energy radiation from the central T Tauri and protostars plays an important role in shaping protoplanetary disks and influences their evolution. Such radiation, in particular X-rays and extreme-ultraviolet (EUV) radiation, is predominantly generated
Güdel Manuel
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