Sublimation from icy jets as a probe of the interstellar volatile content of comets View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1999-03

AUTHORS

Geoffrey A. Blake, C. Qi, Michiel R. Hogerheijde, M. A. Gurwell, D. O. Muhleman

ABSTRACT

Comets are some of the most primitive bodies left over from the Solar System's early history. They may preserve both interstellar material and material from the proto-solar nebula, and so studies of their volatile components can provide clues about the evolution of gases and ices, as a collapsing molecular cloud transforms into a mature planetary system1,2. Previous observations of emission from rotational transitions in molecules have averaged over large areas of the inner coma, and therefore include both molecules that sublimed from the nucleus and those that result from subsequent chemical processes in the coma. Here we present high-resolution observations of emission from the molecules HNC, DCN and HDO associated with comet Hale–Bopp. Our data reveal arc-like structures—icy jets—offset from (but close to) the nucleus. The measured abundance ratios on 1–3″ scales are substantially different from those on larger scales3,4,5, and cannot be accounted for by models of chemical processes in the coma2,6,7; they are, however, similar to the values observed in the cores of dense interstellar clouds and young stellar objects. We therefore propose that sublimation from millimetre-sized icy grains ejected from the nucleus provides access to relatively unaltered volatiles. The D/H ratios inferred from our data suggest that, by mass, Hale–Bopp (and by inference the outer regions of the early solar nebula) consists of ⩾15–40% of largely unprocessed interstellar material. More... »

PAGES

213-216

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/18372

DOI

http://dx.doi.org/10.1038/18372

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1031604244

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/10094044


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206 schema:name Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, 02138, Cambridge, Massachusetts, USA
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208 grid-institutes:grid.47840.3f schema:alternateName Department of Astronomy, University of California, 94720, Berkeley, California, USA
209 schema:name Department of Astronomy, University of California, 94720, Berkeley, California, USA
210 rdf:type schema:Organization
 




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