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Related Experiment Video

Updated: Feb 18, 2026

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Clues to NaCN formation.

G Quintana-Lacaci1, J Cernicharo1, L Velilla Prieto1

  • 1Instituto de Ciencia de Materiales de Madrid, Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain.

Astronomy and Astrophysics
|November 21, 2017
PubMed
Summary
This summary is machine-generated.

Sodium cyanide (NaCN) distribution around IRC +10216 was mapped using ALMA. Its presence is linked to CN, but current models struggle to explain its formation, suggesting a need for updated photochemical models.

Keywords:
astrochemistrycircumstellar matterstars: AGB and post-AGBstars: individual (IRC +10216)

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Area of Science:

  • Astrochemistry
  • Radio Astronomy

Background:

  • The Atacama Large Millimeter/submillimeter Array (ALMA) provides crucial data on molecular formation in space.
  • Understanding molecular origins enhances knowledge of interstellar chemistry.

Purpose of the Study:

  • Investigate the molecular distribution of sodium cyanide (NaCN) around IRC +10216.
  • Clarify the formation pathways of NaCN using high angular resolution maps.

Main Methods:

  • Modeled NaCN emission under local thermal equilibrium (LTE) conditions.
  • Fitted azimuthal averaged intensity profiles to determine NaCN abundance distribution.

Main Results:

  • NaCN presence correlates with CN in the inner ejecta of IRC +10216, possibly from HCN photodissociation.
  • Photochemical models do not fully reproduce the observed CN reservoir.
  • NaCN abundance peaks where NaCl, the proposed parent molecule, declines, but NaCl abundance is lower than NaCN.

Conclusions:

  • Current models are insufficient to explain NaCN formation.
  • Updated photochemical and reaction rate models are needed to elucidate NaCN's origin.