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ALMA Resolves CI Emission from the beta Pictoris Debris Disk
Stockholm University, Faculty of Science, Department of Astronomy. National Astronomical Observatory of Japan, USA; Hungarian Academy of Sciences, Hungary.
Stockholm University, Faculty of Science, Department of Astronomy.
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Number of Authors: 112018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 861, no 1, article id 72Article in journal (Refereed) Published
Abstract [en]

The debris disk around beta Pictoris is known to contain gas. Previous ALMA observations revealed a CO belt at similar to 85 au with a distinct clump, interpreted as a location of enhanced gas production. Photodissociation converts CO into C and O within similar to 50 a. We resolve C I emission at 492 GHz using ALMA and study its spatial distribution. C I shows the same clump as seen for CO. This is surprising, as C is expected to quickly spread in azimuth. We derive a low C mass (between 5 x 10(-4) and 3.1 x 10(-3) MA(circle plus)), indicating that gas production started only recently (within similar to 5000 a). No evidence is seen for an atomic accretion disk inward of the CO belt, perhaps because the gas did not yet have time to spread radially. The fact that C and CO share the same asymmetry argues against a previously proposed scenario where the clump is due to an outward-migrating planet trapping planetesimals in a resonance, nor can the observations be explained by an eccentric planetesimal belt secularly forced by a planet. Instead, we suggest that the dust and gas disks should be eccentric. Such a configuration, we further speculate, might be produced by a recent tidal disruption event. Assuming that the disrupted body has had a CO mass fraction of 10%, its total mass would be greater than or similar to 3M(Moon).

Place, publisher, year, edition, pages
2018. Vol. 861, no 1, article id 72
Keywords [en]
circumstellar matter, methods: observational, radiative transfer, stars: individual (beta Pictoris), submillimeter: planetary systems, techniques: interferometric
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-158345DOI: 10.3847/1538-4357/aac5f3ISI: 000437718000007OAI: oai:DiVA.org:su-158345DiVA, id: diva2:1239035
Available from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-08-15Bibliographically approved

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