Dynamics of gas and dust in protoplanetary disks: planet formation from observational and numerical perspectives

Show simple item record

dc.contributor.author Bi, Jiaqing
dc.date.accessioned 2020-12-22T04:37:35Z
dc.date.available 2020-12-22T04:37:35Z
dc.date.copyright 2020 en_US
dc.date.issued 2020-12-21
dc.identifier.uri http://hdl.handle.net/1828/12478
dc.description.abstract Dust and gas in protoplanetary disks are the building blocks of planets. In this thesis, we study the dynamics of the gas and dust, which are crucial for the planet formation theory, using observational and numerical approaches. The observational part contains the case study of a rare circumtriple disk around the GW Ori hierarchical triple system. We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 1.3 mm dust continuum and 12CO J = 2-1 molecular gas emission of the disk. For the first time, we identify three dust rings in the GW Ori disk at ~46, 188, and 338 au, with the outermost ring being the largest dust ring ever found in protoplanetary disks. We use visibility modeling of the dust continuum and kinematics modeling of CO lines to show that the disk has misaligned parts, and the innermost dust ring is eccentric. We interpret these substructures as evidence of ongoing dynamical interactions between the triple stars and the circumtriple disk. In the numerical part, we study whether or not dust around gas gaps opened by planets can remain settled by performing three-dimensional, dust-plus-gas simulations of protoplanetary disks with an embedded planet. We find planets that open gas gaps 'puff up' small, sub-mm-sized grains at the gap edges, where the dust scale-height can reach 80% of the gas scale-height. We attribute this dust 'puff-up' to the planet-induced meridional gas flows previously identified by Fung and Chiang. We thus emphasize the importance of explicit 3D simulations to obtain the vertical distribution of sub-mm-sized grains around planet gaps. We caution that the gas-gap-opening planet interpretation of well-defined dust rings is only self-consistent with large grains exceeding mm in size. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Dust and gas dynamics en_US
dc.subject Protoplanetary disks en_US
dc.subject ALMA observations en_US
dc.subject Numerical simulations en_US
dc.title Dynamics of gas and dust in protoplanetary disks: planet formation from observational and numerical perspectives en_US
dc.type Thesis en_US
dc.contributor.supervisor Dong, Ruobing
dc.degree.department Department of Physics and Astronomy en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search UVicSpace


My Account