Meet the researcher: My journey in Astrochemistry

- My name is Prasanta Gorai and my research focuses on the impact of evolved stars on galactic chemical enrichment.

By Prasanta Gorai, Eyrun Thune
Published Aug. 15, 2024
A young man from India

Postdoctoral Fellow Prasanta Gorai has been with RoCS - Rosseland Centre for Solar Physics since February 2024. He comes from the small village of Bhamuria in Purulia, West Bengal, India. Photo: Ola Gamst Sæther

Academic journey and early influences

My academic journey began at the University of Burdwan, where I earned my BSc in 2012. I then moved to the University of Calcutta for my MSc, which I completed in 2014, and continued there for my PhD, finishing in 2020. Afterward, I pursued postdoctoral opportunities, first at Chalmers University of Technology in Sweden from 2020 to 2023, and now at RoCS' at ITA, UiO, where I started in February 2024.

My field of expertise is astrochemistry, a discipline I have been passionate about throughout my academic career.

During my PhD at the University of Calcutta, I delved into a combined study of theoretical models and observations. My research involved using astrochemical modeling and quantum chemical tools to investigate the formation and destruction of various complex organic molecules under different astrophysical conditions. I also worked with data from the ALMA interferometry radio telescope to detect interstellar molecules. My research during this period focused on the precursor molecules of the basic building blocks of life within the interstellar medium and circumstellar envelopes.

Shift in research focus

Granada in winter
Pico Veleta, IRAM 30m observatory, Granada, 2nd May 2024 (Observed 2nd May to 7th May 2024. Credit: Private

Following my PhD, I moved to Chalmers University as a postdoc, where I developed astrochemical models based on the turbulent core accretion theory. My work included analyzing high-resolution ALMA data to investigate the chemical origins and physical properties of Young Stellar Objects (YSOs). My research interests have remained consistent over the years, but at RoCS, I have shifted my focus to studying Asymptotic Giant Branch (AGB) stars, which represent the late stages of stellar evolution.

This shift in focus allows me to explore a different phase in the lifecycle of stars, linking my previous work on the early and young stages to the late evolutionary phases.

Current research

The main objective of my current research is to understand how AGB stars impact galactic chemical environments.

I aim to study a large sample of AGB stars to investigate their chemical and physical properties and explore how their chemical compositions recycle from the early stages to the late phases of a star's life. My research will particularly focus on the impact of evolved stars on galactic chemical enrichment, investigating the origins of fluorine, calcium, aluminum, sulfur, and nitrogen-bearing molecules.

To achieve this, I plan to use a combination of observations and theoretical modeling. By integrating these approaches, I hope to gain a comprehensive understanding of how AGB stars influence galactic chemical environments and contribute to the origins of these elements.

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The upper panel shows the detected transitions of aluminum monofluoride (AlF) towards AGB star o Ceti and the lower panel depicts the spatial distribution of three transitions. The white contours show the 50% stellar continuum emission level at the corresponding frequencies and the dashed yellow contours mark the 3-σ level of the line emission. The filled white ellipses indicate the beam size in each observation.
In the bottom right panel, the regions over which the lines were integrated are indicated by the dashed blue ellipse (peak AlF emission), dotted magenta circle (CO v = 1, J = 3−2 line emission region), and dotted-dashed white circle (all AlF emission lines). Credit: Saberi et al. 2022
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High-resolution ALMA observation of the 1.3 mm dust continuum of the high-mass young stellar object G28.20-0.05, together with spatially resolved hot cores and different molecular emissions. Credit: Gorai et al. 2024

The unique blend of Scandinavia

Having spent the last three years in Sweden, I have grown fond of the Nordic countries. When the opportunity arose to move to Norway, I was thrilled. Norway's excellent work-life balance and stunning natural beauty are significant attractions.

Moreover, the advanced science and excellent working environment at RoCS, as I had heard from my friends, made the decision even easier.

Since my arrival, I have found the experience to be exceptional. The warm and welcoming nature of everyone here has made me feel right at home.

Winter landscape Kringsjå, Oslo
The beauty of snow illuminated by reflected sunlight, Kringsjå, Oslo. Credit: Prasanta Gorai

In my spare time, I love to explore nature and immerse myself in its beauty and tranquility. Photography is another passion of mine, allowing me to capture and preserve moments that inspire me, whether it's landscapes, wildlife, or the intricate details of the natural world.

The moon
Captured two different phases of the Moon. Credit: Prasanta Gorai
Published Aug. 15, 2024 1:55 PM - Last modified Aug. 15, 2024 2:02 PM