| Name: SAMRAT GHOSH |
| Affiliation: Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, Uttarakhand 263001 |
| Conference ID: ASI2026_243 |
| Title: Magnetic Activity and Flare Statistics of a Solar Analogue AB Dor |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Samrat Ghosh(Aryabhatta Research Institute of Observational Sciences, Manora peak, Nainital- 263001, India) |
| Abstract: AB Dor A (hereafter AB Dor) is a young, nearby, rapidly rotating and actively flaring K0-type star. As the X-ray source in its quintuple stellar system, AB Dor presents a unique opportunity to study magnetic activity in young solar analogues. With a rotation period of ~0.51 days and intense magnetic behaviour, AB Dor shows short-term variability driven by flares and rotational modulation, as well as long-term variability associated with stellar activity cycles. A shorter "flip-flop" cycle, characterised by periodic shifts between active longitudes, is also reported in similar stars.
We conducted a detailed optical time-series analysis using TESS data. The morphology of the LCs shows spot evolution. We applied spot modelling on each rotational cycle, using a two-spot model, to estimate spot longitudes. Phase evolution was tracked, allowing us to investigate the migration of active longitudes.
AB Dor exhibits very frequent flaring in the data. We analysed the light curves to identify individual flares, estimate their energies, and quantify the frequency of flares. We correlate various flare temporal parameters which indicate self-similar magnetic reconnection physics. The flare frequency distribution reveals the coexistence of two flare populations: frequent, low-energy events and rarer, high-energy flares that collectively dominate the total energy budget.
This study contributes to the understanding of surface magnetic activity and dynamo processes in young, solar-type stars, highlighting AB Dor's value as a benchmark for exploring the early magnetic evolution of the Sun and its analogues. |
