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PhD defence

Bridging the gap between physics and chemistry in early stages of star formation

  • P. Nazari
Tuesday 13 February 2024
Academy Building
Rapenburg 73
2311 GJ Leiden


  • Prof.dr. E.F. van Dishoeck
  • dr. B. Tabone
  • dr. G. P. Rosotti


Stars form from the denser regions of a cloud of gas and dust. These dense regions collapse under their own gravity to form a protostar surrounded by a disk and an envelope. Cores of planets likely begin to form during this stage. Later the envelope dissipates and leaves the disk around the protostar. Once the disk also dissipates or its gas and dust turns into planets, a planetary system forms.

This thesis uses both observations and models to study the physical and chemical conditions of birthplaces of planets where the disk and the protostar are surrounded by an envelope. From the observational side, the Atacama Large Millimeter/submillimeter Array in Chile is used to quantify various molecules in the gas around young protostars. Moreover, observations of James Webb Space Telescope are used to tentatively detect molecules such as methyl cyanide and ethyl cyanide in interstellar ices for the first time. From the modeling side, the radiation emitted from the central protostar which propagates through the disk and the envelope around the protostar is simulated to investigate how physical conditions can change the emission from various molecules.

PhD dissertations

Approximately one week after the defence, PhD dissertations by Leiden PhD students are available digitally through the Leiden Repository, that offers free access to these PhD dissertations. Please note that in some cases a dissertation may be under embargo temporarily and access to its full-text version will only be granted later.

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