Results 51 to 60 of about 11,786 (248)
How do stars gain their mass? A JCMT/SCUBA-2 transient survey of protostars in nearby star-forming regions [PDF]
, 2017 Most protostars have luminosities that are fainter than expected from steady accretion over the protostellar lifetime. The solution to this problem may lie in episodic mass accretion-prolonged periods of very low accretion punctuated by short bursts of ...
LA Hillenbrand (11081283) +57 more
core +6 more sources
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
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
JOYS+: The link between the ice and gas of complex organic molecules. Comparing JWST and ALMA data of two low-mass protostars [PDF]
Astronomy & AstrophysicsA rich inventory of complex organic molecules (COMs) has been observed in high abundances in the gas phase toward Class 0 protostars. It has been suggested that these molecules are formed in ices and sublimate in the warm inner envelope close to the ...
Y. Chen +18 more
semanticscholar +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
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
ON THE DISTRIBUTION OF PROTOSTAR MASSES [PDF]
The Astrophysical Journal, 2009 The distribution of protostar masses is studied for core-environment systems whose duration of infall follows a waiting-time distribution. Each core-environment system has a continuous density profile with no barrier to mass flow. The core is an isothermal sphere and the environment is a filament, a layer, or a uniform medium.
openaire +2 more sources
An APEX survey of outflow and infall toward the youngest protostars in Orion [PDF]
, 2020 Aims: We aim to characterize the outflow properties of a sample of early Class 0 phase low-mass protostars in Orion, which were first identified by the Herschel Space Observatory. We also look for signatures of infall in key molecular lines.
Megeath, S. T. +4 more
core +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 +4 more sources
JWST Observations of Young protoStars (JOYS): Linked accretion and ejection in a Class I protobinary system [PDF]
Accretion and ejection sets the outcome of the star and planet formation process. The mid-infrared wavelength range offers key tracers of those processes that were difficult to detect and spatially resolve in protostars until now.
L. Tychoniec +21 more
semanticscholar +1 more source