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Warm gas at 50 AU in the disk around Herbig Be star HD 100546
M. Goto, G. van der Plas, M. van den Ancker +6
The disk atmosphere is one of the fundamental elements of theoretical models of a protoplanetary disk. However, the direct observation of the warm gas (>> 100 K) at large radius of…
Modeling CO Emission: II. The Physical Characteristics that Determine the X factor in Galactic Molecular Clouds
Rahul Shetty, Simon C. Glover, Cornelis P. Dullemond +3
We investigate how the X factor, the ratio of H_2 column density (NH2) to velocity-integrated CO intensity (W), is determined by the physical properties of gas in model molecular c…
Hot HCN around young massive stars at 0.1" resolution
Rainer Rolffs, Peter Schilke, Friedrich Wyrowski +4
Massive stars form deeply embedded in dense molecular gas, which they stir and heat up and ionize. During an early phase, the ionization is confined to hypercompact HII regions, an…
Resolved Images of Large Cavities in Protoplanetary Transition Disks
Sean Andrews, David Wilner, Catherine Espaillat +5
Circumstellar disks are thought to experience a rapid "transition" phase in their evolution that can have a considerable impact on the formation and early development of planetary…