Constraining variable accretion in deeply embedded protostars with interferometric observations

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dc.contributor.author Francis, Logan
dc.date.accessioned 2018-11-02T21:58:20Z
dc.date.available 2018-11-02T21:58:20Z
dc.date.copyright 2018 en_US
dc.date.issued 2018-11-02
dc.identifier.uri http://hdl.handle.net/1828/10249
dc.description.abstract Variability of pre-main-sequence stars observed at optical wavelengths has been attributed to fluctuations in the mass accretion rate from the circumstellar disk onto the forming star. Detailed models of accretion disks suggest that young deeply em- bedded protostars should also exhibit variations in their accretion rates, and that these changes can be tracked indirectly by monitoring the response of the dust enve- lope at mid-IR to millimeter wavelengths. Interferometers such as ALMA offer the resolution and sensitivity to observe small fluctuations in brightness at the scale of the disk where episodic accretion may be driven. In this thesis, novel methods for comparing interferometric observations are presented and applied to CARMA and ALMA 1.3mm observations of deeply embedded protostars in Serpens taken 9 years apart. No brightness variation is found above the limits of the analysis of a factor of ~>50%, due to the limited sensitivity of the CARMA observations and small number of sources common to both epochs. It is further shown that follow up ALMA observa- tions with a similar sample size and sensitivity may be able to uncover variability at the level of a few percent, and the implications of this for future work are discussed. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject star formation en_US
dc.subject interferometry en_US
dc.subject variable stars en_US
dc.subject protostars en_US
dc.subject accretion en_US
dc.title Constraining variable accretion in deeply embedded protostars with interferometric observations en_US
dc.type Thesis en_US
dc.contributor.supervisor Johnstone, D.
dc.contributor.supervisor Navarro, Julio F.
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

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