New Constraints on the Dust and Gas Distribution in the LkCa 15 Disk from ALMA
Jin,Sheng1; Isella,Andrea2; Huang,Pinghui1,2,3,4; Li,Shengtai3; Li,Hui3; Ji,Jianghui1,5
Source PublicationThe Astrophysical Journal
AbstractAbstract We search a large parameter space of the LkCa 15's disk density profile to fit its observed radial intensity profile of 12CO (J?=?3–2) obtained from Atacama Large Millimeter/submillimeter Array. The best-fit model within the parameter space has a disk mass of 0.1 M⊙ (using an abundance ratio of 12CO/H2?=?1.4?×?10?4 in mass), an inner cavity of 45 au in radius, an outer edge at ~600 au, and a disk surface density profile that follows a power law of the form ρr?∝?r?4. For the disk density profiles that can lead to a small reduced χ2 of the goodness-of-fit, we find that there is a clear linear correlation between the disk mass and the power-law index, γ, in the equation of the disk density profile. This suggests that the 12CO disk of LkCa 15 is optically thick, and we can fit its 12CO radial intensity profile using either a lower disk mass with a smaller γ or a higher disk mass with a bigger γ. By comparing the 12CO channel maps of the best-fit model with disk models with higher or lower masses, we find that a disk mass of ~0.1 M⊙ can best reproduce the observed morphology of the 12CO channel maps. The dust continuum map at 0.87 mm of the LkCa 15 disk shows an inner cavity of the similar size of the best-fit gas model, but its outer edge is at ~200 au, which is much smaller than the fitted gas disk. Such a discrepancy between the outer edges of the gas and dust disks is consistent with dust drifting and trapping models.
Keywordprotoplanetary disks radiative transfer stars: individual (LkCa 15) submillimeter: planetary systems
WOS IDIOP:0004-637X-881-2-ab2dfe
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of
2.Department of Physics and Astronomy, Rice University, 6100 Main St., Houston, TX 77005, USA
3.Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
4.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
5.CAS Center for Excellence in Comparative Planetology, Hefei 230026, People’s Republic of China
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GB/T 7714
Jin,Sheng,Isella,Andrea,Huang,Pinghui,et al. New Constraints on the Dust and Gas Distribution in the LkCa 15 Disk from ALMA[J]. The Astrophysical Journal,2019,881(2).
APA Jin,Sheng,Isella,Andrea,Huang,Pinghui,Li,Shengtai,Li,Hui,&Ji,Jianghui.(2019).New Constraints on the Dust and Gas Distribution in the LkCa 15 Disk from ALMA.The Astrophysical Journal,881(2).
MLA Jin,Sheng,et al."New Constraints on the Dust and Gas Distribution in the LkCa 15 Disk from ALMA".The Astrophysical Journal 881.2(2019).
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