期刊
ASTROPHYSICAL JOURNAL
卷 756, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/756/2/168
关键词
stars: formation; stars: protostars; techniques: interferometric
资金
- Laboratory for Astronomical Imaging at the University of Illinois
- NSF [AST-07-09206]
- NASA through Hubble Fellowship [HF-51300.01]
- Space Telescope Science Institute
- NASA [NAS 5-26555]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1139950] Funding Source: National Science Foundation
We present dual-wavelength observations and modeling of the nearly edge-on Class 0 young stellar object L1157-mm. Using the Combined Array for Research in Millimeter-wave Astronomy, a nearly spherical structure is seen from the circumstellar envelope at the size scale of 10(2)-10(3) AU in both 1 mm and 3 mm dust emission. Radiative transfer modeling is performed to compare data with theoretical envelope models, including a power-law envelope model and the Terebey-Shu-Cassen model. Bayesian inference is applied for parameter estimation and information criterion is used for model selection. The results prefer the power-law envelope model against the Terebey-Shu-Cassen model. In particular, for the power-law envelope model, a steep density profile with an index of similar to 2 is inferred. Moreover, the dust opacity spectral index beta is estimated to be similar to 0.9, implying that grain growth has started at L1157-mm. Also, the unresolved disk component is constrained to be less than or similar to 40 AU in radius and less than or similar to 4-25 M-Jup in mass. However, the estimate of the embedded disk component relies on the assumed envelope model.
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