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Chamani Gunasekera

My Research: Grain Depletions in the ISM

Elements condensing into dust grains is an important physical process that occurs in the ISM. Through studies on extinction, scattering, heating and depletion of elements out of gas-phase, it has long been known that grains have a major effect on observed spectra of galaxies. Despite the large amount of observations available on extinction, scattering, and heating, details of depletions onto grains and their effect on observed emission-line spectra are rarely studied. My work involves, exploring the effects of grain depletions on strong spectral lines. In addition, we are in the process of adding new code into Cloudy, allowing a user to alter the degree of grain depletions in a given model.

Selected Publications:

"Ingesting a fluid atomic database: Adopting CHIANTI v10.0.1 into CLOUDY"
Gunasekera, C. M., Chatzikos, M., Yan, R., Ferland, G., 2022. Astronomy; 1(3):255-270.
https://doi.org/10.3390/astronomy1030015

"Self consistent grain depletions and abundances II: Effects on strong-line diagnostics of extragalactic H II regions"
Gunasekera, C. M, Ji, X., Chatzikos, M., Yan, R., Ferland, G., 2022. (In Review at MNRAS Journal)
https://ui.adsabs.harvard.edu/abs/2022arXiv220513023G/abstract

"Self-consistent grain depletions and abundances I: The Orion Nebula as a test case"
Gunasekera, C. M, Ji, X., Chatzikos, M., Yan, R., Ferland, G., 2022, Monthly Notices of the Royal Astronomical Society. doi:10.1093/mnras/stac022
https://ui.adsabs.harvard.edu/abs/2022MNRAS.512.2310G/abstract