THE ENVELOPE AND EMBEDDED DISK AROUND THE CLASS 0 PROTOSTAR L1157-mm: DUAL-WAVELENGTH INTERFEROMETRIC OBSERVATIONS AND MODELING
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 super(2)-10 super(3) AU i...
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| Veröffentlicht in: | The Astrophysical journal 2012-09, Vol.756 (2), p.1-21 |
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| creator | CHIANG, Hsin-Fang LOONEY, Leslie W TOBIN, John J |
| description | 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 super(2)-10 super(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 ~2 is inferred. Moreover, the dust opacity spectral index beta is estimated to be ~0.9, implying that grain growth has started at L1157-mm. Also, the unresolved disk component is constrained to be [ |
| doi_str_mv | 10.1088/0004-637x/756/2/168 |
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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 super(2)-10 super(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 ~2 is inferred. Moreover, the dust opacity spectral index beta is estimated to be ~0.9, implying that grain growth has started at L1157-mm. Also, the unresolved disk component is constrained to be [<, ~]40 AU in radius and [<, ~]4-25 M sub(Jup) in mass. 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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 super(2)-10 super(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 ~2 is inferred. Moreover, the dust opacity spectral index beta is estimated to be ~0.9, implying that grain growth has started at L1157-mm. Also, the unresolved disk component is constrained to be [<, ~]40 AU in radius and [<, ~]4-25 M sub(Jup) in mass. However, the estimate of the embedded disk component relies on the assumed envelope model.</description><subject>Arrays</subject><subject>ASTRONOMY</subject><subject>ASTROPHYSICS</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>COMPARATIVE EVALUATIONS</subject><subject>COMPUTERIZED SIMULATION</subject><subject>COSMIC DUST</subject><subject>Criteria</subject><subject>DENSITY</subject><subject>Disks</subject><subject>Dust</subject><subject>Earth, ocean, space</subject><subject>Envelopes</subject><subject>Estimates</subject><subject>Exact sciences and technology</subject><subject>GRAIN GROWTH</subject><subject>INDEXES</subject><subject>Inference</subject><subject>OPACITY</subject><subject>PROTOSTARS</subject><subject>RADIANT HEAT TRANSFER</subject><subject>Radiative transfer</subject><subject>SPHERICAL CONFIGURATION</subject><subject>STAR MODELS</subject><subject>STARS</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqNkc1u1DAURi0EEkPpE3RjCSGxCeP_OOzSiTsTkYmrJNN2Z7muI4JmJm2cSrDi1UmYwprV1b0633cXB4ALjD5jJOUSIcQiQeMfy5iLJVliIV-BBeZURozy-DVY_CXu3oJ3IXyfV5IkC_Cr2SioyhtV6GsF0zKDanupskxlMMvrrzCt9G46ztSqSOsaInhd6UbXTVrBAmMeR4fDF5jt0iK6TacaVa6bDczLRlVXqtJb1VT5CurLWlU3aZPrsv7zZaszVeTl-j1409p98Ocv8wzsrlSz2kSFXuerqdQxmoxRK5NWiESKGN3H2NvkPn5ImMXOUtZahJn0zj4gSzF1DpNWEsloyzhD3GJEJD0DH069fRg7E1w3evfN9cejd6MhBCWEcjFRn07U49A_PfswmkMXnN_v7dH3z8HgmFOOpCD8P1BCsCSEzSg9oW7oQxh8ax6H7mCHnwYjM_szsw4z2zGTP0PM5G9KfXx5YIOz-3awR9eFf1EiKMds4n4D1mGOMg</recordid><startdate>20120910</startdate><enddate>20120910</enddate><creator>CHIANG, Hsin-Fang</creator><creator>LOONEY, Leslie W</creator><creator>TOBIN, John J</creator><general>IOP</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20120910</creationdate><title>THE ENVELOPE AND EMBEDDED DISK AROUND THE CLASS 0 PROTOSTAR L1157-mm: DUAL-WAVELENGTH INTERFEROMETRIC OBSERVATIONS AND MODELING</title><author>CHIANG, Hsin-Fang ; LOONEY, Leslie W ; TOBIN, John J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c439t-f89f6698670b71ea9b7d94a1ca34fa0148ecad0a313cc12f82843f45405a10283</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Arrays</topic><topic>ASTRONOMY</topic><topic>ASTROPHYSICS</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>COMPARATIVE EVALUATIONS</topic><topic>COMPUTERIZED SIMULATION</topic><topic>COSMIC DUST</topic><topic>Criteria</topic><topic>DENSITY</topic><topic>Disks</topic><topic>Dust</topic><topic>Earth, ocean, space</topic><topic>Envelopes</topic><topic>Estimates</topic><topic>Exact sciences and technology</topic><topic>GRAIN GROWTH</topic><topic>INDEXES</topic><topic>Inference</topic><topic>OPACITY</topic><topic>PROTOSTARS</topic><topic>RADIANT HEAT TRANSFER</topic><topic>Radiative transfer</topic><topic>SPHERICAL CONFIGURATION</topic><topic>STAR MODELS</topic><topic>STARS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>CHIANG, Hsin-Fang</creatorcontrib><creatorcontrib>LOONEY, Leslie W</creatorcontrib><creatorcontrib>TOBIN, John J</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>CHIANG, Hsin-Fang</au><au>LOONEY, Leslie W</au><au>TOBIN, John J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>THE ENVELOPE AND EMBEDDED DISK AROUND THE CLASS 0 PROTOSTAR L1157-mm: DUAL-WAVELENGTH INTERFEROMETRIC OBSERVATIONS AND MODELING</atitle><jtitle>The Astrophysical journal</jtitle><date>2012-09-10</date><risdate>2012</risdate><volume>756</volume><issue>2</issue><spage>1</spage><epage>21</epage><pages>1-21</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>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 super(2)-10 super(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 ~2 is inferred. Moreover, the dust opacity spectral index beta is estimated to be ~0.9, implying that grain growth has started at L1157-mm. Also, the unresolved disk component is constrained to be [<, ~]40 AU in radius and [<, ~]4-25 M sub(Jup) in mass. However, the estimate of the embedded disk component relies on the assumed envelope model.</abstract><cop>Bristol</cop><pub>IOP</pub><doi>10.1088/0004-637x/756/2/168</doi><tpages>21</tpages></addata></record> |
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| source | Institute of Physics Open Access Journal Titles; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Arrays ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPARATIVE EVALUATIONS COMPUTERIZED SIMULATION COSMIC DUST Criteria DENSITY Disks Dust Earth, ocean, space Envelopes Estimates Exact sciences and technology GRAIN GROWTH INDEXES Inference OPACITY PROTOSTARS RADIANT HEAT TRANSFER Radiative transfer SPHERICAL CONFIGURATION STAR MODELS STARS |
| title | THE ENVELOPE AND EMBEDDED DISK AROUND THE CLASS 0 PROTOSTAR L1157-mm: DUAL-WAVELENGTH INTERFEROMETRIC OBSERVATIONS AND MODELING |
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