An ALMA archival exploitation of Herbig group I and II protoplanetary disks

Taun, Alexandru-Daniel (2019) An ALMA archival exploitation of Herbig group I and II protoplanetary disks. Master's Thesis / Essay, Astronomy.

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Abstract

In this thesis, we have defined a sample of dust and gas observations of protoplanetary disks around Herbig Ae/Be stars using the ALMA Archive and measured the outer radii and the fluxes for the continuum and the $^{13}$CO line. Fluxes for $^{12}$CO and C$^{18}$O lines were also measured were data was available . After combining information about the stellar parameters from the literature with our results, we attempt a disk taxonomy and distinguish between possible evolutionary tracks. We find that Group I disks span a wide range in radii. We divide them into small Group I ($<$200 AU, 5 disks) and large Group I disks ($>$300 AU, 3 disks), however it is not clear if there is a real distinction between them or our sample is missing the intermediate size Group I disks that would fill in the missing gap. Group II disks (5 disks) are on average smaller ($<$150 AU) with low continuum and CO gas fluxes and span a wide range in ages. We conclude that an evolution from a Group II disk into a small Group I is very unlikely. However, the Group I/II (2 disks) disks which have low scattered light emission (continuous disk, no gap - a Group II feature) show similar features in sub-mm with small Group I disks such as radial extent and continuum and CO fluxes. Since these Group I/II disks are relatively young, we consider a possible evolution from a Group I/II to a small Group I disk through a mechanism that carves an inner cavity (e.g. a planet).

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Kamp, I.E.E.
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	18 Aug 2020 17:58
Last Modified:	18 Aug 2020 17:58
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/23131

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