I am a researcher in astrophysics, and I also enjoy doing web development and general-purpose programming (nope, not just numerical coding :). In this website, you will find information on my research, and also various online tools and software I made, which are mainly related to astronomy.
At present, I am a postdoctoral researcher at Aarhus University, Denmark. Previously I was a postdoc for four years at The Ohio State University (OSU), USA,…
Bose, S. et al., 2025, A&A, 699, A169
Type Ia supernovae are well-established standard candles for cosmological distance measurements due to their known peak intrinsic brightness. This is possible because their peak luminosity correlates with the shape of their light curves, allowing for calibration using parameters such as the light-curve decline rate (\(\Delta m_{15}\)) and the color-stretch parameter (\(s_{BV}\)).
However, ASASSN-20jq (also known as SN 2020qxp) is a low-luminosity Type Ia supernova that stands out as a significant outlier in luminosity calibration relations based on either of these light-curve shape parameters, \(\Delta m_{15}\) or \(s_{BV}\) — behavior not previously observed in other Type Ia supernovae. Spectroscopic analysis reveals a marginal yet conclusive detection of the forbidden \(\rm [O\,I]\) \(\lambda\lambda6300,~6364\)…