``Unveiling the blueprint of the cosmos.''

Dr. Chamani M. Gunasekera

I am an astrophycist, currently working as a postdoctoral researcher at the Space Telescope Science Institute, which I joined in May 2024. I received my PhD from the University of Kentucky in December 2023.

My primary research goal is to understand the underlying physics (from cosmic chemical evolution to details of radiative transfer) of hot gaseous environments from optical to X-ray. I study the chemical evolution, the details of radiative transport, and the microphysical processes in astrophysical gases. I am a collaborator of the CLOUDY, a spectral synthesis software that simulates conditions in gaseous nebulae. I work closely with Gary J. Ferland and Peter van Hoof. My research at STScI focuses on understanding dust extinction in collaboration with Karl D. Gordon and Marjorie Decleir.

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Research

Selected Publications

Cloudy and the High-Resolution Microcalorimeter Revolution: Optical, UV, and X-ray Spectra of One-electron Systems

Gunasekera, Chamani M.; van Hoof, Peter A. M.; Chatzikos, Marios and Ferland, Gary J. (2025) doi: 10.48550/arXiv.2412.01606

New Insights with XRISM & Cloudy: A novel Column Density Diagnostic

Gunasekera, Chamani M.; van Hoof, Peter A. M.; Tsujimoto, Masahiro and Ferland, Gary J. (2025) doi: 10.1051/0004-6361/202453133

Self consistent grain depletions and abundances II: Effects on strong-line diagnostics of extragalactic H II regions

Gunasekera, Chamani M.; Ji, Xihan; Chatzikos, Marios; Yan, Renbin and Ferland, Gary J. (2023) doi: 10.1093/mnras/stad322

The 23.01 Release of Cloudy

Gunasekera, Chamani M.; van Hoof, Peter A. M.; Chatzikos, Marios and Ferland, Gary J. (2023) doi: 10.3847/2515-5172/ad0e75

The 2025 Release of Cloudy

Gunasekera, Chamani M.; van Hoof, Peter A. M.; Dehghanian, Maryam; Chakraborty, Priyanka ; Shaw, Gargi; Bianchi, Stefano; Chatzikos, Marios; Tsujimoto, Masahiro and Ferland, Gary J. (2025) doi: 10.

Contact and Useful Links

cgunasekera@stsci.edu

ADS Library: https://ui.adsabs.harvard.edu/public-libraries/jqXibSA5S-uc6YAIlLlaRg

ORCID: 0000-0002-4634-5966

ISM* Research Group: https://www.ismstar.space/

CLOUDY: wiki.nublado.org

Chianti to Chianti converter: gitlab.nublado.org/cloudy/arrack