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The ALMA-PILS surve...
The ALMA-PILS survey: First detections of ethylene oxide, acetone and propanal toward the low-mass protostar IRAS 16293-2422
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- Lykke, J. M. (author)
- Köpenhamns universitet,University of Copenhagen
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- Coutens, A. (author)
- University College London (UCL)
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- Jorgensen, J. K. (author)
- Köpenhamns universitet,University of Copenhagen
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- van der Wiel, M. H. D. (author)
- Köpenhamns universitet,University of Copenhagen
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- Garrod, R. T. (author)
- University of Virginia
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- Müller, H. S. P. (author)
- Universität zu Köln,University of Cologne
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- Bjerkeli, Per, 1977 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bourke, T. L. (author)
- SKA Organisation
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- Calcutt, H. (author)
- Köpenhamns universitet,University of Copenhagen
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- Drozdovskaya, M. N. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Favre, C. (author)
- Université Grenoble Alpes,Grenoble Alpes University,Centre national de la recherche scientifique (CNRS)
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- Fayolle, E. C. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Jacobsen, S. K. (author)
- Köpenhamns universitet,University of Copenhagen
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- Öberg, K. I. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Persson, M. V. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- van Dishoeck, E. F. (author)
- Universiteit Leiden (UL),Leiden University (UL),Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Wampfler, S. F. (author)
- Universität Bern,University of Bern
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(creator_code:org_t)
- 2016-12-21
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 597, s. A53-
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Abstract
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- Context. One of the open questions in astrochemistry is how complex organic and prebiotic molecules are formed. The unsurpassed sensitivity of the Atacama Large Millimeter/submillimeter Array (ALMA) takes the quest for discovering molecules in the warm and dense gas surrounding young stars to the next level. Aims. Our aim is to start the process of compiling an inventory of oxygen-bearing complex organic molecules toward the solar-type Class 0 protostellar binary IRAS 16293-2422 from an unbiased spectral survey with ALMA, Protostellar Interferometric Line Survey (PILS). Here we focus on the new detections of ethylene oxide (c-C2H4O), acetone (CH3COCH3), and propanal (C2H5CHO). Methods. With ALMA, we surveyed the spectral range from 329 to 363 GHz at 0.5? (60 AU diameter) resolution. Using a simple model for the molecular emission in local thermodynamical equilibrium, the excitation temperatures and column densities of each species were constrained. Results. We successfully detect propanal (44 lines), ethylene oxide (20 lines) and acetone (186 lines) toward one component of the protostellar binary, IRAS 16293B. The high resolution maps demonstrate that the emission for all investigated species originates from the compact central region close to the protostar. This, along with a derived common excitation temperature of Tex ? 125 K, is consistent with a coexistence of these molecules in the same gas. Conclusions. The observations mark the first detections of acetone, propanal and ethylene oxide toward a low-mass protostar. The relative abundance ratios of the two sets of isomers, a CH3COCH3/C2H5CHO ratio of 8 and a CH3CHO/c-C2H4O ratio of 12, are comparable to previous observations toward high-mass protostars. The majority of observed abundance ratios from these results as well as those measured toward high-mass protostars are up to an order of magnitude above the predictions from chemical models. This may reflect either missing reactions or uncertain rates in the chemical networks. The physical conditions, such as temperatures or densities, used in the models, may not be applicable to solar-type protostars either.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ISM: Abundances
- Astrobiology
- Astrochemistry
- ISM: Individual object: IRAS 16293-2422 line: Identification
- ISM: Molecules
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Lykke, J. M.
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Coutens, A.
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Jorgensen, J. K.
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van der Wiel, M. ...
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Garrod, R. T.
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Müller, H. S. P.
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Bjerkeli, Per, 1 ...
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Bourke, T. L.
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Calcutt, H.
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Drozdovskaya, M. ...
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Favre, C.
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Fayolle, E. C.
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Jacobsen, S. K.
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Öberg, K. I.
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Persson, M. V.
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van Dishoeck, E. ...
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Wampfler, S. F.
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Chalmers University of Technology