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Type of talk
Seminar
Speaker
Dr. Koshvendra Singh
Affiliation
ARIES
Date and Time of Talk
Venue
Auditorium
Abstract

Young stars assemble their mass by accreting from the circumstellar disk, leading to the co-evolution of the disk, the birth bed of planets. However, the process of accretion is not steady. It varies by a factor of few to hundreds on timescales ranging from days to centuries. The excess luminosity during the higher order variabilities, also called outbursts, have lasting consequences on the thermal, chemical, and mineralogical history of the disk. Moreover, what physical mechanism triggers these outbursts remains elusive, partly due to a smaller sample of observed outbursts, but largely owing to dissimilar evolutionary profiles.  It underscores the careful study of each and every outbursting young star. In this talk, I will outline the results from the latest outburst of Gaia24ccy, a young stellar object. Utilising the observational signatures of similarity, timescales, mass reservoirs, and disk heating, we could constrain that the outburst was possibly triggered by a thermal instability due to inhomogeneous accretion in the disk at around ~0.047 au. 
 

Email Speaker
koshvendra@aries.res.in
About Speaker

 Dr. Koshvendra Singh joined ARIES as a post-doc with Dr. Saurabh Sharma on October 31, 2025. He got his BSc (physics hons) from Banaras Hindu University (2016-2019) followed by integrated-PhD working with Prof. Devendra Ojha, TIFR, Mumbai from 2019-2025. His research focuses on the observational understanding of the low mass star formation, specifically the accretion mechanism, its variability and consequences on the star-disk evolution. He has been building pipelines and numerical setup for [C II] line mapping of star forming regions with TIFR 100cm balloon-borne telescope.

Email Host
govind@aries.res.in
Host Name
Govind Nandakumar
Host Phone (ext/mob)
778