Illuminating a tadpole's metamorphosis II: observing the ongoing transformation with ALMA
Author
dc.contributor.author
Reiter, Megan
Author
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Guzmán, Andrés E.
Author
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Haworth, Thomas J.
Author
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Klaassen, Pamela D.
Author
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McLeod, Anna F.
Author
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Garay Brignardello, Guido
Author
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Mottram, Joseph C.
Admission date
dc.date.accessioned
2020-11-03T14:16:18Z
Available date
dc.date.available
2020-11-03T14:16:18Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
MNRAS 496, 394–414 (2020)
es_ES
Identifier
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10.1093/mnras/staa1504
Identifier
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https://repositorio.uchile.cl/handle/2250/177540
Abstract
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We present new Atacama Large Millimeter/submillimeter Array observations of the tadpole, a small globule in the Carina Nebula that hosts the HH 900 jet+outflow system. Our data include (CO)-C-12, (CO)-C-13, (CO)-O-18 J=2-1, (CO)-C-13, (CO)-O-18 J=3-2, and serendipitous detections of DCN J=3-2 and CS J=7-6. With angular resolution comparable to the Hubble Space Telescope, our data reveal for the first time the bipolar molecular outflow in CO, seen only inside the globule, that is launched from the previously unseen jet-driving protostar (the HH 900 YSO). The biconical morphology joins smoothly with the externally irradiated outflow seen in ionized gas tracers outside the globule, tracing the overall morphology of a jet-driven molecular outflow. Continuum emission at the location of the HH 900 YSO appears to be slightly flattened perpendicular to outflow axis. Model fits to the continuum have a best-fitting spectral index of similar to 2, suggesting cold dust and the onset of grain growth. In position-velocity space, (CO)-C-13 and (CO)-O-18 gas kinematics trace a C-shaped morphology, similar to infall profiles seen in other sources, although the global dynamical behaviour of the gas remains unclear. Line profiles of the CO isotopologues display features consistent with externally heated gas. We estimate a globule mass of similar to 1.9 M-circle dot, indicating a remaining lifetime of similar to 4 Myr, assuming a constant photoevaporation rate. This long globule lifetime will shield the disc from external irradiation perhaps prolonging its life and enabling planet formation in regions where discs are typically rapidly destroyed.
es_ES
Patrocinador
dc.description.sponsorship
McLaughlin Fellowship at the University of Michigan
European Union (EU)
665593
Royal Society of London
National Aeronautics & Space Administration (NASA)
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
AFB-170002
National Aeronautics & Space Administration (NASA)
NAS 5-26555