THE SPITZER c2d LEGACY RESULTS: STAR-FORMATION RATES AND EFFICIENCIES; EVOLUTION AND LIFETIMES
- N. Evans, M. Dunham, A. Sargent
- Physics
- 6 November 2008
The c2d Spitzer Legacy project obtained images and photometry with both IRAC and MIPS instruments for five large, nearby molecular clouds. Three of the clouds were also mapped in dust continuum…
The c2d Spitzer Spectroscopic Survey of Ices around Low-Mass Young Stellar Objects. I. H2O and the 5-8 μm Bands
- A. Boogert, K. Pontoppidan, K. Stapelfeldt
- Physics
- 28 November 2007
To study the physical and chemical evolution of ices in solar-mass systems, a spectral survey is conducted of a sample of 41 low-luminosity YSOs (L ∼ 0.1–10 L☉) using 3-38 μm Spitzer and ground-based…
Testing grain-surface chemistry in massive hot-core regions
- S. Bisschop, J. Jørgensen, E. F. Dishoeck, E. Wachter
- Chemistry, Physics
- 2 February 2007
Aims. We study the chemical origin of a set of complex organic molecules thought to be produced by grain surface chemistry in high mass young stellar objects (YSOs). Methods. A partial submillimeter…
The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. III. Perseus Observed with IRAC
- J. Jørgensen, P. Harvey, K. Young
- Physics
- 21 March 2006
We present observations of 3.86 deg2 of the Perseus molecular cloud complex with the Spitzer Space Telescope Infrared Array Camera (IRAC). The maps show strong extended emission arising from shocked…
Physical structure and CO abundance of low-mass protostellar envelopes
- J. Jørgensen, F. Schoeier, E. Dishoeck
- Physics
- 5 May 2002
We present 1D radiative transfer modelling of the envelopes of a sample of 18 low-mass protostars and pre-stellar cores with the aim of setting up realistic physical models, for use in a chemical…
Does IRAS 16293–2422 have a hot core? Chemical inventory and abundance changes in its protostellar environment
- F. Schoeier, J. Jørgensen, E. F. Dishoeck, G. Blake
- Physics
- 27 May 2002
A detailed radiative transfer analysis of the observed continuum and molecular line emission toward the deeply embedded young stellar object IRAS 16293-2422 is performed. Accurate molecular…
A “Starless” Core that Isn't: Detection of a Source in the L1014 Dense Core with the Spitzer Space Telescope
- C. Young, J. Jørgensen, Z. Wahhaj
- Physics, Geology
- 16 June 2004
We present observations of L1014, a dense core in the Cygnus region previously thought to be starless, but data from the Spitzer Space Telescope show the presence of an embedded source. We propose a…
PROSAC: a submillimeter array survey of low-mass protostars - II. The mass evolution of envelopes, disks, and stars from the class 0 through I stages
- J. Jørgensen, E. Dishoeck, P. Myers
- Physics, Geology
- 18 September 2009
Context. The key question about early protostellar evolution is how matter is accreted from the large-scale molecular cloud, through the circumstellar disk onto the central star. Aims. We constrain…
PROSAC: A Submillimeter Array Survey of Low-Mass Protostars. I. Overview of Program: Envelopes, Disks, Outflows, and Hot Cores
- J. Jørgensen, T. Bourke, Qizhou Zhang
- Physics
- 4 January 2007
This paper presents a large spectral line and continuum survey of eight deeply embedded, low-mass protostellar cores using the SMA. High-excitation line emission from 11 molecular species originating…
Molecular inventories and chemical evolution of low-mass protostellar envelopes
- J. Jørgensen, F. Schoeier, E. Dishoeck, L. Observatory, Stockholm Observatory
- Physics, Environmental Science
- 9 December 2003
This paper presents the first substantial study of the chemistry of the envelopes around a sample of 18 low-mass pre- and protostellar objects for which physical properties have previously been…
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