36th Annual Report (2023-24)

192 ResearchArea Researchwork Supernovae, X-ray Binaries, GRBs and Galaxies The spectral and timing study of X-ray Binaries was conducted by Pravat Dangal (Thesis submitted) with N.K. Chakradhari in collaboration with Ranjeev Misra (IUCAA, Pune). UV-optical photometric and spectroscopic study of supernovae is being carried out by Shritika Tiwari (Thesis to be submitted), Kripa Ram Sahu (Thesis work ongoing) and Mulchand Kurre (Thesis work ongoing) with N.K. Chakradhari in collaboration with G.C. Anupama andD.K. Sahu (IIA, Bengaluru). A study of early-type/lenticular galaxies was carried out by Mahendra Kumar Verma (PhD awarded) and Amit Kumar Tamrakar (PhD awarded), with S.K. Pandey and Laxmikant Chaware in collaboration with S. Barwey (IIA Bengaluru) and Kanak Saha (IUCAA, Pune). A study of GRBs – on aspects of multi- Coordinator: Dr N. K. Chakradhari ICARD - School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur (Activities from 01 April 2023 to 31 March 2024) wavelength emission, environment and host galaxies was carried out by Ankur Ghosh (PhD awarded) with Amitesh Omar, Kuntal Misra (ARIES, Nainital) and N.K. Chakradhari (co-supervisor). 1. Weak secondary cyclotron line in eclipsing High Mass X-ray Binary Cen X- 3, Pravat Dangal, Ranjeev Misra, N. K. Chakradhari, Yashpal Bhulla, 2024, MNRAS, 527, 6981. 2. Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT, Ghosh Ankur, Vaishnava C. S., Resmi L., Misra Kuntal, Arun K. G., Omar Amitesh, Chakradhari N. K., 2024, MNRAS, 527, 8068. 3. Type Ia supernovae SN 2013bz, PSN J0910+5003 and ASASSN-16ex: similar to 09dc-like? Tiwari S., Chakradhari N. K., Sahu D. K., Anupama G.C., Kumar B., andSahu K.R., 2023, MNRAS, 521, 5207. The following papers were presented nd at the 42 annual meeting of the Astronomical Society of India (ASI PublicationsusingICARDfacilities 2024), hosted jointly by IISc, ISRO and JNP, Bengalufrom, from31 January to 04February2024. a) Normal Type Ia Supernova SN 2010ju, Shrutika Tiwari, N.K. Chakradhari, K.R. Sahu, Mulchand Kurre, D.K. Sahu, G.C. Anupama. b) Optical Studies of Type Ic Supernova SN 2020ak f i n ga l axy KUG 0925+387B, K.R. Sahu, Yogita Patel, Mulchand Kurre, Shrutika Tiwari, N.K. Chakradhari, G.C. Anupama, D.K. Sahu. c) Photometric and Spectroscopic Studies of Supernova SN 2021mxx, Mulchand Kurre, D.K. Sahu, G.C. Anupama, Yogita Patel, N.K. Chakradhari. Skywatch programmes were organised at the following places using the ICARD facilities. 1. NIT Raipur, 26 and 27October 2023. OutreachActivities 4. A. Chanda, A. Halder, A. S. Majumdar, B. C. Paul, Late time cosmology in f(R; G) gravity with exponential interactions Euro. Phys. Journal C83, 23 (2023). 5. R. Sengupta, B. C. Paul, M. Kalam, Lorentzian wormholes in an emergent universe Class. Quantum Grav. 40, 095009 (2023). 6. M. Ghising, Ruchi Tamang, M. Tobrej, Binay Rai, B. C. Paul, Spectral & Timing Analysis of BeXRB eRASSU J050810.4- 660653 recently discovered in the Large Magellanic Cloud (LMC) Mon. Not. Roy. Astron. Soc. (MNRAS) 518, 893- 899 (2023). 7. S. Ghosh, A. Chanda, S. Dey, B. C. Paul Barrow Holographic Dark Energy in Brane - World Cosmology, Class. QuantumGrav. 41035004 (2024). 8. Binay Rai, Biswajit Paul, Manoj Ghising, Md. Tobrej, Ruchi Tamang, Bikash Chandra Paul, Luminosity dependent cyclotron line in Swift J 1626.6-5156 - JOAA45, 7 (2024). 9. M. Tobrej, Binay Rai, Manoj Ghising, Ruchi Tamang, B. C. Paul, Spectral Study of Neutron Star low mass X-ray binary Source 1A 1744-361 - Mon. Not. Roy. Astron. Soc., 526, 2032-2038 (2024). 10. M. Ghishing, Md.Tobrej, B. C. Paul The ongoing spin-down episode of 4U 1626-67 - Mon. Not. Roy. Astron. Soc 5283550?3558 (2024). 11. D Bhattacharjee, P K Chattopadhyay, B. C. Paul New gravastar model in generalized cylindrically symmetric spacetime and prediction of mass limit - Physics of the Dark Universe 43, 101411(2024). 12. B. C. Paul, Gaussian Black Hole in Brane- World - EuroPhys. J C84, 309 (2024).