Constraining the Infalling Envelope Models of Embedded Protostars: BHR 71 and Its Hot Corino
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Constraining the Infalling Envelope Models of Embedded Protostars : BHR 71 and Its Hot Corino. / Yang, Yao-Lun; Evans, Neal J.; Smith, Aaron; Lee, Jeong-Eun; Tobin, John J.; Terebey, Susan; Calcutt, Hannah; Jorgensen, Jes K.; Green, Joel D.; Bourke, Tyler L.
In: Astrophysical Journal, Vol. 891, No. 1, 61, 01.03.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Constraining the Infalling Envelope Models of Embedded Protostars
T2 - BHR 71 and Its Hot Corino
AU - Yang, Yao-Lun
AU - Evans, Neal J.
AU - Smith, Aaron
AU - Lee, Jeong-Eun
AU - Tobin, John J.
AU - Terebey, Susan
AU - Calcutt, Hannah
AU - Jorgensen, Jes K.
AU - Green, Joel D.
AU - Bourke, Tyler L.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - The collapse of a protostellar envelope results in the growth of a protostar and the development of a protoplanetary disk, playing a critical role during the early stages of star formation. Characterizing the gas infall in the envelope constrains the dynamical models of star formation. We present unambiguous signatures of infall, probed by optically thick molecular lines, toward an isolated embedded protostar, BHR 71 IRS1. The three-dimensional radiative transfer calculations indicate that a slowly rotating infalling envelope model following the "inside-out" collapse reproduces the observations of both lines, as well as the low-velocity emission of the HCN line. The envelope has a model-derived ag lines, where outflows or a Keplerian disk may contribute. The ALMA observations serendipitously discover the emission of complex organic molecules (COMs) concentrated within a radius of 100 au, indicating that BHR 71 IRS1 harbors a hot corino. Eight species of COMs are identified, including CH3OH and CH3OCHO, along with H2CS, SO2 and HCN v(2) = 1. The emission of methyl formate and C-13-methanol shows a clear velocity gradient within a radius of 50 au, hinting at an unresolved Keplerian rotating disk.
AB - The collapse of a protostellar envelope results in the growth of a protostar and the development of a protoplanetary disk, playing a critical role during the early stages of star formation. Characterizing the gas infall in the envelope constrains the dynamical models of star formation. We present unambiguous signatures of infall, probed by optically thick molecular lines, toward an isolated embedded protostar, BHR 71 IRS1. The three-dimensional radiative transfer calculations indicate that a slowly rotating infalling envelope model following the "inside-out" collapse reproduces the observations of both lines, as well as the low-velocity emission of the HCN line. The envelope has a model-derived ag lines, where outflows or a Keplerian disk may contribute. The ALMA observations serendipitously discover the emission of complex organic molecules (COMs) concentrated within a radius of 100 au, indicating that BHR 71 IRS1 harbors a hot corino. Eight species of COMs are identified, including CH3OH and CH3OCHO, along with H2CS, SO2 and HCN v(2) = 1. The emission of methyl formate and C-13-methanol shows a clear velocity gradient within a radius of 50 au, hinting at an unresolved Keplerian rotating disk.
KW - Star formation
KW - Protostars
KW - Bok globules
KW - Astrochemistry
KW - Radiative transfer
KW - Gravitational collapse
KW - SUBMILLIMETER-WAVE SPECTRUM
KW - MOLECULAR CLOUD CORES
KW - ASTROPHYSICAL INTEREST
KW - PROTOSTELLAR COLLAPSE
KW - ROTATIONAL SPECTRUM
KW - MICROWAVE-SPECTRA
KW - PHYSICAL CONDITIONS
KW - TORSIONAL STATES
KW - COLOGNE DATABASE
KW - METHYL FORMATE
U2 - 10.3847/1538-4357/ab7201
DO - 10.3847/1538-4357/ab7201
M3 - Journal article
VL - 891
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 61
ER -
ID: 247691707