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Earth, Moon, and Planets

, Volume 90, Issue 1–4, pp 335–347 | Cite as

Nitrogen Sulfide In Comets Hyakutake (C/1996 B2) And Hale–Bopp (C/1995 O1)

  • Marcus V. Canaves
  • Amaury A. De Almeida
  • Daniel C. Boice
  • Gilberto C. Sanzovo
Article

Abstract

The chemistry of both nitrogen and sulfur presents interesting problems in comets.In this paper, we use a model of cometary comae with gas-phase chemical kineticsand gas dynamics to predict molecular abundances in the inner coma region for twoof the brightest comets in the past 20 years, Hyakutake (C/1996 B2) and Hale–Bopp(C/1995 O1). In this progress report we concentrate on the gas-phase chemistry of thenitrogen sulfide (NS) radical at a heliocentric distance of 1 AU to study the abundanceof NS using a detailed photo and chemical reaction network with over 100 species andabout 1000 reactions. The results are compared with recent observations of CometHale–Bopp and reveal that conventional gas-phase reactions schemes do not produceNS in sufficient quantities to explain the observations. We plan to continue therefinement of the model to improve agreement with observational constraints.

Abundance comet C/1995 O1 Hale–Bopp comet C/1996 B2 Hyakutake cometary comae nitrogen sulfide 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Marcus V. Canaves
    • 1
  • Amaury A. De Almeida
    • 1
  • Daniel C. Boice
    • 2
  • Gilberto C. Sanzovo
    • 3
  1. 1.Department of Astronomy, Institute of Astronomy, Geophysics and Atmospheric SciencesUniversity of São Paulo, Main Campus, Rua do MatãoBrazil
  2. 2.Department of Space Science, Instrumentation and Space Research DivisionSouthwest Research InstituteSan AntonioUSA
  3. 3.Laboratory of Molecular Astrophysics, Department of Physics, StateUniversity of Londrina, PerobalLondrina, ParanáBrazil

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