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pro vyhledávání: '"Forgan, Duncan H."'
Autor:
Forgan, Duncan H.
Publikováno v:
International Journal of Astrobiology 18 (2019) 552-561
The concept of a rapid spread of self-replicating interstellar probes (SRPs) throughout the Milky Way adds considerable strength to Fermi's Paradox. A single civilisation creating a single SRP is sufficient for a fleet of SRPs to grow and explore the
Externí odkaz:
http://arxiv.org/abs/1903.00770
Autor:
Forgan, Duncan H
Pebble accretion has become a popular component to core accretion models of planet formation, and is especially relevant to the formation of compact, resonant terrestrial planetary systems. Pebbles initially form in the inner protoplanetary disc, swe
Externí odkaz:
http://arxiv.org/abs/1902.05385
Autor:
Jankovic, Marija R., Haworth, Thomas J., Ilee, John D., Forgan, Duncan H., Cyganowski, Claudia J., Walsh, Catherine, Brogan, Crystal L., Hunter, Todd R., Mohanty, Subhanjoy
Simulations of massive star formation predict the formation of discs with significant substructure, such as spiral arms and clumps due to fragmentation. Here we present a semi-analytic framework for producing synthetic observations of discs with subs
Externí odkaz:
http://arxiv.org/abs/1810.11398
Autor:
Quénard, David, Ilee, John D., Jiménez-Serra, Izaskun, Forgan, Duncan H., Hall, Cassandra, Rice, Ken
Recent high-sensitivity observations carried out with ALMA have revealed the presence of complex organic molecules (COMs) such as methyl cyanide (CH$_{\rm 3}$CN) and methanol (CH$_{\rm 3}$OH) in relatively evolved protoplanetary discs. The behaviour
Externí odkaz:
http://arxiv.org/abs/1809.09900
Autor:
Forgan, Duncan H., Bonnell, Ian A.
We revisit an alternate explanation for the turbulent nature of molecular clouds - namely, that velocity dispersions matching classical predictions of driven turbulence can be generated by the passage of clumpy material through a shock. While previou
Externí odkaz:
http://arxiv.org/abs/1809.06601
The spiral waves detected in the protostellar disc surrounding Elias 2-27 have been suggested as evidence of the disc being gravitationally unstable. However, previous work has shown that a massive, stable disc undergoing an encounter with a massive
Externí odkaz:
http://arxiv.org/abs/1805.08041
Autor:
Hippke, Michael, Forgan, Duncan H.
We have previously argued that targeted interstellar communication has a physical optimum at narrowband X-ray wavelengths $\lambda\approx1\,$nm, limited by the surface roughness of focusing devices at the atomic level (arXiv:1711.05761). We search 24
Externí odkaz:
http://arxiv.org/abs/1712.06639
Autor:
Hippke, Michael, Forgan, Duncan H.
The optimal frequency for interstellar communication, using "Earth 2017" technology, was derived in papers I and II of this series (arXiv:1706.03795, arXiv:1706.05570). The framework included models for the loss of photons from diffraction (free spac
Externí odkaz:
http://arxiv.org/abs/1711.05761
Upon entering a star system, light sails are subject to both gravitational forces and radiation pressure, and can use both in concert to modify their trajectory. Moreover, stars possess significant magnetic fields, and if the sail is in any way charg
Externí odkaz:
http://arxiv.org/abs/1711.05856