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ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii

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cam.issuedOnline2018-05-17
cam.orpheus.successThu Jan 30 13:04:52 GMT 2020 - The item has an open VoR version.
dc.contributor.authorAnsdell, M
dc.contributor.authorWilliams, JP
dc.contributor.authorTrapman, L
dc.contributor.authorTerwisga, SE van
dc.contributor.authorFacchini, S
dc.contributor.authorManara, CF
dc.contributor.authorMarel, N van der
dc.contributor.authorMiotello, A
dc.contributor.authorTazzari, M
dc.contributor.authorHogerheijde, M
dc.contributor.authorGuidi, G
dc.contributor.authorTesti, L
dc.contributor.authorDishoeck, EF van
dc.contributor.orcidTazzari, Marco [0000-0003-3590-5814]
dc.date.accessioned2018-06-06T14:19:13Z
dc.date.available2018-06-06T14:19:13Z
dc.date.issued2018
dc.description.abstractWe present ALMA Band 6 observations of a complete sample of protoplanetary disks in the young (1-3 Myr) Lupus star-forming region, covering the 1.33 mm continuum and the 12CO, 13CO, and C18O J=2-1 lines. The spatial resolution is 0.25 arcsec with a medium 3-sigma continuum sensitivity of 0.30 mJy, corresponding to M_dust ~ 0.2 M_earth. We apply "Keplerian masking" to enhance the signal-to-noise ratios of our 12CO zero-moment maps, enabling measurements of gas disk radii for 22 Lupus disks; we find that gas disks are universally larger than mm dust disks by a factor of two on average, likely due to a combination of the optically thick gas emission as well as the growth and inward drift of the dust. Using the gas disk radii, we calculate the dimensionless viscosity parameter, alpha_visc, finding a broad distribution and no correlations with other disk or stellar parameters, suggesting that viscous processes have not yet established quasi-steady states in Lupus disks. By combining our 1.33 mm continuum fluxes with our previous 890 micron continuum observations, we also calculate the mm spectral index, alpha_mm, for 70 Lupus disks; we find an anti-correlation between alpha_mm and mm flux for low-mass disks (M_dust < 5), followed by a flattening as disks approach alpha_mm = 2, which could indicate faster grain growth in higher-mass disks, but may also reflect their larger optically thick components. In sum, this work demonstrates the continuous stream of new insights into disk evolution and planet formation that can be gleaned from unbiased ALMA disk surveys.
dc.identifier.doi10.17863/CAM.23968
dc.identifier.eissn1538-4357
dc.identifier.issn1538-4357
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/276673
dc.language.isoeng
dc.publisherIOP Publishing
dc.publisher.urlhttp://dx.doi.org/10.3847/1538-4357/aab890
dc.subjectaccretion, accretion disks
dc.subjectcircumstellar matter
dc.subjectplanetary systems
dc.subjectprotoplanetary disks
dc.subjectstars: premain sequence
dc.subjectstars: variables: T Tauri, Herbig Ae/Be
dc.titleALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
dc.typeArticle
dcterms.dateAccepted2018-03-13
prism.issueIdentifier1
prism.number21
prism.publicationNameThe Astrophysical Journal
prism.volume859
pubs.funder-project-idEuropean Research Council (341137)
rioxxterms.licenseref.startdate2018-03-13
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionVoR
rioxxterms.versionofrecord10.3847/1538-4357/aab890

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