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ALMA spectral survey of Supernova 1987A : molecular inventory, chemistry, dynamics and explosive nucleosynthesis

M Matsuura, R Indebetouw, S Woosley, V Bujarrabal, FJ Abellán, R McCray, J Kamenetzky, C Fransson, MJ Barlow, HL Gomez, et al. (2017) MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 469(3). p.3347-3362
abstract
We report the first molecular line survey of Supernova 1987A in the millimetre wavelength range. In the Atacama Large Millimeter/submillimeter Array (ALMA) 210-300 and 340360 GHz spectra, we detected cold (20-170 K) CO, (SiO)-Si-28, HCO+ and SO, with weaker lines of 29SiO from ejecta. This is the first identification of HCO+ and SO in a young supernova remnant. We find a dip in the J = 6-5 and 5-4 SiO line profiles, suggesting that the ejecta morphology is likely elongated. The difference of theCOand SiO line profiles is consistent with hydrodynamic simulations, which showthat Rayleigh-Taylor instabilities causemixing of gas, with heavier elements much more disturbed, making more elongated structure. We obtained isotopologue ratios of (SiO)-Si-28/(SiO)-Si-29> 13, (SiO)-Si-28/(SiO)-Si-30> 14 and (CO)-C-12/(CO)-C-13 > 21, with the most likely limits of (SiO)-Si-28/(SiO)-Si-29 > 128, (SiO)-Si-28/(SiO)-Si-30 > 189. Low Si-29 and Si-30 abundances in SN 1987A are consistent with nucleosynthesis models that show inefficient formation of neutron-rich isotopes in a low-metallicity environment, such as the Large Magellanic Cloud. The deduced large mass of HCO+ (similar to 5 x 10(-6)M(circle dot)) and small SiS mass (< 6 x 10-5M(circle dot)) might be explained by some mixing of elements immediately after the explosion. The mixing might have caused some hydrogen from the envelope to sink into carbon- and oxygen-rich zones after the explosion, enabling the formation of a substantial mass of HCO+. Oxygen atoms may have penetrated into silicon and sulphur zones, suppressing formation of SiS. Our ALMA observations open up a new window to investigate chemistry, dynamics and explosive nucleosynthesis in supernovae.
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author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
supernovae: individual: Supernova 1987A, ISM: abundances, ISM: molecules, ISM: supernova remnants, radio lines: ISM, CORE-COLLAPSE SUPERNOVAE, LARGE-MAGELLANIC-CLOUD, INFRARED WATER-VAPOR, II-P SUPERNOVAE, NEBULA M 1-92, SN 1987A, CARBON-MONOXIDE, LINE EMISSION, MASSIVE STARS, CIRCUMSTELLAR RING
journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Mon. Not. Roy. Astron. Soc.
volume
469
issue
3
pages
3347 - 3362
Web of Science type
Article
Web of Science id
000406836200060
ISSN
0035-8711
1365-2966
DOI
10.1093/mnras/stx830
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8538450
handle
http://hdl.handle.net/1854/LU-8538450
date created
2017-11-22 08:31:29
date last changed
2017-12-15 15:01:19
@article{8538450,
  abstract     = {We report the first molecular line survey of Supernova 1987A in the millimetre wavelength range. In the Atacama Large Millimeter/submillimeter Array (ALMA) 210-300 and 340360 GHz spectra, we detected cold (20-170 K) CO, (SiO)-Si-28, HCO+ and SO, with weaker lines of 29SiO from ejecta. This is the first identification of HCO+ and SO in a young supernova remnant. We find a dip in the J = 6-5 and 5-4 SiO line profiles, suggesting that the ejecta morphology is likely elongated. The difference of theCOand SiO line profiles is consistent with hydrodynamic simulations, which showthat Rayleigh-Taylor instabilities causemixing of gas, with heavier elements much more disturbed, making more elongated structure. We obtained isotopologue ratios of (SiO)-Si-28/(SiO)-Si-29{\textrangle} 13, (SiO)-Si-28/(SiO)-Si-30{\textrangle} 14 and (CO)-C-12/(CO)-C-13 {\textrangle} 21, with the most likely limits of (SiO)-Si-28/(SiO)-Si-29 {\textrangle} 128, (SiO)-Si-28/(SiO)-Si-30 {\textrangle} 189. Low Si-29 and Si-30 abundances in SN 1987A are consistent with nucleosynthesis models that show inefficient formation of neutron-rich isotopes in a low-metallicity environment, such as the Large Magellanic Cloud. The deduced large mass of HCO+ (similar to 5 x 10(-6)M(circle dot)) and small SiS mass ({\textlangle} 6 x 10-5M(circle dot)) might be explained by some mixing of elements immediately after the explosion. The mixing might have caused some hydrogen from the envelope to sink into carbon- and oxygen-rich zones after the explosion, enabling the formation of a substantial mass of HCO+. Oxygen atoms may have penetrated into silicon and sulphur zones, suppressing formation of SiS. Our ALMA observations open up a new window to investigate chemistry, dynamics and explosive nucleosynthesis in supernovae.},
  author       = {Matsuura, M and Indebetouw, R and Woosley, S and Bujarrabal, V and  Abell{\'a}n, FJ and McCray, R and Kamenetzky, J and Fransson, C and Barlow, MJ and Gomez, HL and Cigan, P and De Looze, Ilse and Spyromilio, J and Staveley-Smith, L and Zanardo, G and Roche, P and Larsson, J and Viti, S and van Loon, JTh and Wheeler, JC and Baes, Maarten and Chevalier, R and Lundqvist, P and Marcaide, JM and Dwek, E and Meixner, M and Ng, C-Y and Sonneborn, G and Yates, J},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {supernovae: individual: Supernova 1987A,ISM: abundances,ISM: molecules,ISM: supernova remnants,radio lines: ISM,CORE-COLLAPSE SUPERNOVAE,LARGE-MAGELLANIC-CLOUD,INFRARED WATER-VAPOR,II-P SUPERNOVAE,NEBULA M 1-92,SN 1987A,CARBON-MONOXIDE,LINE EMISSION,MASSIVE STARS,CIRCUMSTELLAR RING},
  language     = {eng},
  number       = {3},
  pages        = {3347--3362},
  title        = {ALMA spectral survey of Supernova 1987A : molecular inventory, chemistry, dynamics and explosive nucleosynthesis},
  url          = {http://dx.doi.org/10.1093/mnras/stx830},
  volume       = {469},
  year         = {2017},
}

Chicago
Matsuura, M, R Indebetouw, S Woosley, V Bujarrabal, FJ Abellán, R McCray, J Kamenetzky, et al. 2017. “ALMA Spectral Survey of Supernova 1987A : Molecular Inventory, Chemistry, Dynamics and Explosive Nucleosynthesis.” Monthly Notices of the Royal Astronomical Society 469 (3): 3347–3362.
APA
Matsuura, M., Indebetouw, R., Woosley, S., Bujarrabal, V., Abellán, F., McCray, R., Kamenetzky, J., et al. (2017). ALMA spectral survey of Supernova 1987A : molecular inventory, chemistry, dynamics and explosive nucleosynthesis. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 469(3), 3347–3362.
Vancouver
1.
Matsuura M, Indebetouw R, Woosley S, Bujarrabal V, Abellán F, McCray R, et al. ALMA spectral survey of Supernova 1987A : molecular inventory, chemistry, dynamics and explosive nucleosynthesis. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2017;469(3):3347–62.
MLA
Matsuura, M, R Indebetouw, S Woosley, et al. “ALMA Spectral Survey of Supernova 1987A : Molecular Inventory, Chemistry, Dynamics and Explosive Nucleosynthesis.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469.3 (2017): 3347–3362. Print.