Cold Dark Clouds: The Initial Conditions for Star Formation
- E. Bergin, M. Tafalla
- Physics
- 25 May 2007
AbstractCold dark clouds are nearby members of the densest and coldest phase in the Galactic interstellar medium, and represent the most accessible sites where stars like our Sun are currently being…
WATER, O2, AND ICE IN MOLECULAR CLOUDS
- D. Hollenbach, M. Kaufman, E. Bergin, G. Melnick
- Physics
- 9 September 2008
We model the temperature and chemical structure of molecular clouds as a function of depth into the cloud, assuming a cloud of constant density n illuminated by an external far-ultraviolet (FUV; 6 eV…
An old disk still capable of forming a planetary system
- E. Bergin, L. Cleeves, E. Dishoeck
- Physics, GeologyNature
- 31 January 2013
The detection of hydrogen deuteride, combined with existing observations and detailed models, implies a disk mass of more than 0.05 solar masses, which is enough to form a planetary system like the authors' own.
Ocean-like water in the Jupiter-family comet 103P/Hartley 2
- P. Hartogh, D. Lis, G. Blake
- Geology, PhysicsNature
- 13 October 2011
It is reported that the D/H ratio in the Jupiter-family comet 103P/Hartley 2, which originated in the Kuiper belt, is (1.61 ± 0.24) × 10−4, which substantially expands the reservoir of Earth ocean-like water to include some comets, and is consistent with the emerging picture of a complex dynamical evolution of the early Solar System.
THE EFFECTS OF SNOWLINES ON C/O IN PLANETARY ATMOSPHERES
- K. Öberg, R. Murray-Clay, E. Bergin
- Physics, Geology
- 25 October 2011
The C/O ratio is predicted to regulate the atmospheric chemistry in hot Jupiters. Recent observations suggest that some exoplanets, e.g., Wasp 12-b, have atmospheric C/O ratios substantially…
A Study of the Physics and Chemistry of TMC-1
- P. Pratap, J. Dickens, F. Schloerb
- Physics, Environmental ScienceAstrophysical Journal
- 10 September 1997
The most striking abundance variations relative to HCO+ along the ridge were seen for HC3N, CH3CCH, and SO, while smaller variations were seen in CS, C2H, and HCN, indicating that the so-called NH3 peak in TMC-1 is probably a peak in the ammonia column density rather than a relative abundance peak.
A Study of the Physics and Chemistry of L134N
- J. Dickens, W. Irvine, M. Miralles
- Physics
- 20 October 2000
We have carried out a comprehensive and self-consistent study of the physical and chemical state of the core of the dark cloud L134N (L183), whose molecular abundances provide a standard against…
A UNIFORM CATALOG OF MOLECULAR CLOUDS IN THE MILKY WAY
- T. Rice, A. Goodman, E. Bergin, Christopher N. Beaumont, T. Dame
- Physics
- 8 February 2016
The all-Galaxy CO survey of Dame et al. is by far the most uniform, large-scale Galactic CO survey. Using a dendrogram-based decomposition of this survey, we present a catalog of 1064 massive…
Detection of the Water Reservoir in a Forming Planetary System
- M. Hogerheijde, E. Bergin, E. V. van Dishoeck
- Physics, GeologyScience
- 20 October 2011
The Heterodyne Instrument for the Far-Infrared on board the Herschel Space Observatory has detected emission lines from both spin isomers of cold water vapor from the disk around the young star TW Hydrae, hinting at a water ice reservoir equivalent to several thousand Earth oceans in mass.
Chemical Evolution in Preprotostellar and Protostellar Cores
The chemistry of developing and collapsing low-mass protostellar cores is followed using a chemical code with a time-varying density. Two evolutionary scenarios are represented, gravitational…
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