Results 21 to 30 of about 4,978 (213)
Lifetime of the Outer Solar System Nebula From Carbonaceous Chondrites
Journal of Geophysical Research: Planets, Volume 127, Issue 7, July 2022., 2022 Abstract The evolution and lifetime of protoplanetary disks (PPDs) play a central role in the formation and architecture of planetary systems. Astronomical observations suggest that PPDs evolve in two timescales, accreting onto the star for up to several million years (Myr) followed by gas dissipation within ≲1 Myr. Because solar nebula magnetic fields
Cauê S. Borlina +3 more
wiley +1 more source
Magnetic Effects Promote Supermassive Star Formation in Metal-enriched Atomic-cooling Halos
The Astrophysical Journal, 2023 Intermediate-mass black holes (with ≥10 ^5 M _⊙ ) are promising candidates for the origin of supermassive black holes (with ∼10 ^9 M _⊙ ) in the early universe (redshift z ∼ 6).
Shingo Hirano +2 more
doaj +1 more source
Optimizing End-to-End System Performance for Millimeter and Submillimeter Spectroscopy of Protostars: Wideband Heterodyne Receivers and Sideband-Deconvolution Techniques for Rapid Molecular-Line Surveys [PDF]
, 2011 This thesis describes the construction, integration, and use of a new 230-GHz ultra-wideband heterodyne receiver, as well as the development and testing of a new sideband-deconvolution algorithm, both designed to enable rapid, sensitive molecular-line ...
Sumner, Matthew Casey
core +1 more source
Security and Communication Networks, Volume 2022, Issue 1, 2022., 2022 At present, the health monitoring system of world sports events uses the system's on‐site information or periodic test information to evaluate the health of the system. In order to make the data more accurate, the application of cloud computing is necessary.
Rui Feng, Ning Chang, Muhammad Arif
wiley +1 more source
Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a "Radical + Ice" Mechanism. [PDF]
ChempluschemThe presence of interstellar complex organic molecules (COMs) has been baffling astrochemists for a long time. Methyl formate and glycolaldehyde are widely detected but their abundances mismatch kinetic astrochemical model predictions. Here, the formation of these two COMs is characterized onto a mixed ice surface, highlighting the importance of ...
Perrero J +3 more
europepmc +2 more sources
What Can Meteorites Tell Us About the Formation of Jupiter?
AGU Advances, Volume 2, Issue 2, June 2021., 2021 Abstract Gas giants like Jupiter are a fundamental component of planetary systems, but how they formed has been uncertain. Here we discuss how paleomagnetic records in meteorites of the solar nebula may tell us about Jupiter's final growth stage. We suggest that under certain testable assumptions, the meteorite data indicate that proto‐Jupiter grew ...
Benjamin P. Weiss, William F. Bottke
wiley +1 more source
NONSTEADY ACCRETION IN PROTOSTARS [PDF]
The Astrophysical Journal, 2009 Observations indicate that mass accretion rates onto low-mass protostars are generally lower than the rates of infall to their disks; this suggests that much of the protostellar mass must be accreted during rare, short outbursts of rapid accretion. We explore when protostellar disk accretion is likely to be highly variable. While constant $α$ disks can
Zhu, Zhaohuan +2 more
openaire +2 more sources
Formation of single and binary protostars
, 1993 The authors report here computer simulations of protostars condensing out of interstellar gas. The simulations involve the supersonic collision of two clouds, which are intrinsically stable against ...
Pongracic, H. +6 more
core +6 more sources
, 2005 International audienceThe specificity of the formation of OB stars and the importance of understanding the origin of stellar masses up to the highest masses justify an effort to identify the protostellar precursors of high-mass stars.
Bontemps, Sylvain +3 more
core +3 more sources
Optical spectroscopy of Gaia detected protostars with DOT: can we probe protostellar photospheres? [PDF]
, 2023 Optical spectroscopy offers the most direct view of the stellar properties and the accretion indicators. Standard accretion tracers, such as $H\beta$, $H\alpha$, and, Ca II triplet lines, and most photospheric features, fall in the optical wavelengths ...
Ghosh, Arpan +9 more
core +3 more sources