Herschel detects oxygen in the β Pictoris debris disk

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DOIResolve DOI: http://doi.org/10.1051/0004-6361/201628395
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TypeArticle
Journal titleAstronomy & Astrophysics
ISSN0004-6361
1432-0746
Volume591
Article numberA27
Pages16
SubjectEarly-type stars; Individual stars; beta Pictoris; circumstellar matter
AbstractThe young star β Pictoris is well known for its dusty debris disk produced through collisional grinding of planetesimals, kilometre-sized bodies in orbit around the star. In addition to dust, small amounts of gas are also known to orbit the star; this gas is likely the result of vaporisation of violently colliding dust grains. The disk is seen edge on and from previous absorption spectroscopy we know that the gas is very rich in carbon relative to other elements. The oxygen content has been more difficult to assess, however, with early estimates finding very little oxygen in the gas at a C/O ratio that is 20 × higher than the cosmic value. A C/O ratio that high is difficult to explain and would have far-reaching consequences for planet formation. Here we report on observations by the far-infrared space telescope Herschel, using PACS, of emission lines from ionised carbon and neutral oxygen. The detected emission from C⁺ is consistent withthat previously reported observed by the HIFI instrument on Herschel, while the emission from O is hard to explain without assuming a higher density region in the disk, perhaps in the shape of a clump or a dense torus required to sufficiently excite the O atoms. A possible scenario is that the C/O gas is produced by the same process responsible for the CO clump recently observed by the Atacama Large Millimeter/submillimeter Array in the disk and that the redistribution of the gas takes longer than previously assumed. A more detailed estimate of the C/O ratio and the mass of O will have to await better constraints on the C/O gas spatial distribution.
Publication date
PublisherEDP Sciences
LanguageEnglish
AffiliationNational Science Infrastructure; National Research Council Canada
Peer reviewedYes
Identifieraa28395-16
NPARC number23000370
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Record identifier78ce62ec-668d-46f9-8d5a-fe75c1743310
Record created2016-07-11
Record modified2016-07-11
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