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pro vyhledávání: '"Parker Richard A"'
The stellar mass distribution in star-forming regions, stellar clusters and associations, the Initial Mass Function (IMF), appears to be invariant across different star-forming environments, and is consistent with the IMF observed in the Galactic fie
Externí odkaz:
http://arxiv.org/abs/2411.19333
The recent discovery of tens of Jupiter-mass binary objects (JuMBOs) in the Orion Nebula Cluster with the James Webb Space Telescope has intensified the debate on the origin of free-floating planetary mass objects within star-forming regions. The JuM
Externí odkaz:
http://arxiv.org/abs/2410.09159
The two main competing theories proposed to explain the formation of massive ($>10$M$_\odot$) stars -- competitive accretion and monolithic core collapse -- make different observable predictions for the environment of the massive stars during, and im
Externí odkaz:
http://arxiv.org/abs/2408.03990
The architectures of extrasolar planetary systems often deviate considerably from the ``standard" model for planet formation, which is largely based on our own Solar System. In particular, gas giants on close orbits are not predicted by planet format
Externí odkaz:
http://arxiv.org/abs/2405.12741
Autor:
Ballu, Kévin, Lim, Jia-Hui, Parton, Thomas G., Parker, Richard M., Frka-Petesic, Bruno, Lapkin, Alexei A., Ogawa, Yu, Vignolini, Silvia
Cellulose nanocrystals (CNCs) are bioderived nanoparticles that can be isolated from various sources of natural cellulose via acid hydrolysis. However, the link between particle morphological characteristics and their ensemble behavior is poorly unde
Externí odkaz:
http://arxiv.org/abs/2404.04171
Observations of star-forming regions provide snapshots in time of the star formation process, and can be compared with simulation data to constrain the initial conditions of star formation. In order to make robust inferences, different metrics must b
Externí odkaz:
http://arxiv.org/abs/2402.12472
Whilst the formation of Solar system planets is constrained by meteoritic evidence, the geophysical history of low-mass exoplanets is much less clear. The bulk composition and climate states of rocky exoplanets may vary significantly based on the com
Externí odkaz:
http://arxiv.org/abs/2402.06476
Autor:
Parker, Richard J.
Simulations of the effects of stellar fly-bys on planetary systems in star-forming regions show a strong dependence on subtle variations in the initial spatial and kinematic substructure of the regions. For similar stellar densities, the more substru
Externí odkaz:
http://arxiv.org/abs/2308.05790
Autor:
Patel, Miti, Polius, Cheyenne K. M., Ridsdill-Smith, Matthew, Lichtenberg, Tim, Parker, Richard
The presence of short-lived radioisotopes (SLRs) 26-Al and 60-Fe in the Solar system places constraints on the initial conditions of our planetary system. Most theories posit that the origin of 26-Al and 60-Fe is in the interiors of massive stars, an
Externí odkaz:
http://arxiv.org/abs/2308.03830
The dominant formation mechanism of brown dwarfs and planetary mass objects in star-forming regions is presently uncertain. Do they form like stars, via the collapse and fragmentation of cores in Giant Molecular clouds, or do they form like planets i
Externí odkaz:
http://arxiv.org/abs/2308.01335