IIA Institutional Repository: Recent submissions

  • Simultaneous far-ultraviolet and near-ultraviolet observations of T Tauri stars with UVIT/AstroSat: Probing the accretion process in young stars 
    Nayak, Prasanta K; Narang, Mayank; Manoj, P; Gorti, U; Subramaniam, Annapurni; George, Nayana; Mondal, Chayan (The American Astronomical Society, 2024-09-01)
    We present results from simultaneous far-ultraviolet (FUV) and near-ultraviolet (NUV) observations of T Tauri stars (TTSs) in the Taurus molecular cloud with UVIT/AstroSat. This is the very first UVIT study of TTSs. ...
  • Optical polarimetry study of the Lambda-Orionis star-forming region 
    Neha, S; Archana Soam; Maheswar, G (EDP Sciences, 2024-09)
    We present an optical polarimetry study of the nearby star-forming region Lambda-Orionis to map the plane-of-the-sky magnetic field geometry to understand the magnetized evolution of the HII region and the associated small ...
  • Challenges in modeling the dark matter halo of NGC 1052–DF2: Cored versus cuspy halo models 
    Aditya, K (EDP Sciences, 2024-09)
    Aims. The discovery of NGC 1052−DF2 and subsequent modeling have shown that NGC 1052−DF2 is deficient in dark matter and is in conflict with the standard stellar-to-halo mass ratio. In this work, we aim to resolve the ...
  • Transition region response to quiet-Sun Ellerman bombs 
    Bhatnagar, Aditi; van der Voort, Luc Rouppe; Joshi, Jayant (EDP Sciences, 2024-09)
    Context. Quiet-Sun Ellerman bombs (QSEBs) are key indicators of small-scale photospheric magnetic reconnection events. Recent high-resolution observations have shown that they are ubiquitous and that large numbers of QSEBs ...
  • Modelling the connection between propagating disturbances and solar spicules 
    Skirvin, S. J; Samanta, T; Van Doorsselaere, T (EDP Sciences, 2024-09)
    Aims. Propagating (intensity) disturbances (PDs) have been extensively reported in observations of coronal loops and polar plumes, along with more recent links to co-temporal spicule activity in the solar atmosphere. ...
  • The enigmatic double-peaked stripped-envelope SN 2023aew 
    Kangas, T; Kuncarayakti, H; Nagao, T; Kotak, R; Kankare, E; Fraser, M; Stevance, H; Mattila, S; Maeda, K; Stritzinger, M; Lundqvist, P; Elias-Rosa, N; Ferrari, L; Folatelli, G; Frohmaier, C; Galbany, L; Kawabata, M; Koutsiona, E; Muller-Bravo, T. E; Piscarreta, L; Pursiainen, M; Singh, A; Taguchi, K; Teja, R. S; Valerin, G; Pastorello, A; Benetti, S; Cai, Y. Z; Charalampopoulos, P; Gutierrez, C. P; Kravtsov, T; Reguitti, A (EDP Sciences, 2024-09)
    We present optical and near-infrared photometry and spectroscopy of SN 2023aew and our findings on its remarkable properties. This event, initially resembling a Type IIb supernova (SN), rebrightens dramatically ∼90 d after ...
  • Redshifts of candidate host galaxies of four fast X-ray transients using VLT/MUSE 
    Inkenhaag, Anne; Jonker, Peter G; Levan, A. J; Vásquez, Jonathan Quirola; Bauer, Franz E; Deepak, Eappachen (EDP Sciences, 2024-09)
    Context. Fast X-ray transients (FXTs) are X-ray flares that last from minutes to hours. Multi-wavelength counterparts to these FXTs have proven hard to find. As a result, distance measurements are made through indirect ...
  • Effects of coronal rain on decayless kink oscillations of coronal loops 
    Shrivastav, Arpit Kumar; Pant, Vaibhav; Antolin, Patrik (EDP Sciences, 2024-09)
    Decayless kink oscillations are ubiquitously observed in active region coronal loops with an almost constant amplitude for several cycles. Decayless kink oscillations of coronal loops triggered by coronal rain have been ...
  • Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra 
    Joshi, Arti; Catelan, Marcio; Scaringi, Simone; Schwope, Axel; Anupama, G. C; Rawat, Nikita; Sahu, D. K; Singh, Mridweeka; Dastidar, Raya; Subramanian, Rama Venkata; Rao, Srinivas M (EDP Sciences, 2024-09)
    We present the analysis of optical photometric and spectroscopic observations of two non-magnetic cataclysmic variables, namely CRTS J080846.2+313106 and V416 Dra. We find CRTS J080846.2+313106 to vary with a period of ...
  • The morphology and kinematics of the galaxy group AM 1054-325: A MUSE perspective 
    Yadav, Jyoti; Jadhav, Vikrant V (EDP Sciences, 2024-09)
    Galaxy interactions in groups can lead to intense starbursts and the activation of active galactic nuclei (AGNs). The stripped gas from the outer disk can lead to star-forming clumps along the tidal tails or sometimes tidal ...
  • Front optics design of TIFR-ARIES Multi-Object Optical to Near Infrared Spectrometer (TA-MOONS) 
    Poojary, S. S; Krishna Reddy, B; Ninan, Joe. P; Shah, Harshit; Ojha, D.K; Sharma, Saurabh; Reji, Varghese; Surya, Arun; Udhwani, Purvi; Costa, S. L. D; Naik, M. B; Mookerjea, B; Puravankara, Manoj; Tendulkar, Shriharsh; Jadhav, R. B; Sandimani, P. R; Gharat, S. M; Bhagat, S. B; Jadhav, Krushna (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-06)
    TA-MOONS is a multi-object Optical to Near Infrared (NIR) spectrometer with the primary science cases to conduct a spectroscopic survey of Young Stellar Objects (YSO’s) at visible as well as at NIR wavebands simultaneously ...
  • Theoretical Analysis of Fiber Arrangements for Improved Coupling Efficiency in the VBT High-Resolution Echelle Spectrograph 
    Singh, Nitish; Sriram, S; Bharat Kumar, Y; Prasanna, Deshmukh (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-06)
    In fiber-based spectroscopy within telescopes, a prevailing limitation has been the necessity to align the fiber diameter with the telescope’s seeing conditions, often characterized by the Full Width at Half Maximum of ...
  • Design for Enabling Echelle and OMR Spectrograph Observations for Point and Extended Sources on the Same Night at VBT 
    Singh, Nitish; Sriram, S; Bharat Kumar, Y; Prasanna, Deshmukh (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-06)
    The 2.34m Vainu Bappu Telescope (VBT) is a reflecting telescope that operates in two modes, prime focus and cassegrain focus, and is equipped with two instruments. In prime focus mode, the telescope has the F-number ...
  • Liger at W. M. Keck Observatory: Overall Design and Science Drivers 
    Wright, Shelley A; Jones, Tucker; Larkin, James; Kupke, Renate; Kassis, Marc; Brown, Aaron; Andersen, David; Armus, Lee; Cale, Bryson; Cosens, Maren; Chu, Devin; Do, Tuan; Fassanacht, Chris; Fisher, Deanne; Fitzgerald, Michael; Ghez, Andrea; Greene, Jenny; Hayashi, Takeru; Hees, Aurelien; Hirtenstein, Jessie; Johnson, Chris; Keane, Jacqueline; Kelly, Patrick; Kirbyo, Evan; Karalidi, Theodora; Konopackya, Quinn; Kress, Evan; Lu, Jessica; Lyke, Jim; Magnone, Kenneth; Maire, Jerome; McGurk, Rosalie; Medling, Anne; Millar-Blanchaer, Maxwell; Minor, Quinn; Nash, Reston; Nierenberg, Anna; Reddy, Naveen; Rich, Michael; Ruffio, Jean-Baptiste; Rundquist, Nils-Erik; Sabhlok, Sanchit; Sand, David; Sanders, Ryan; Sandstrom, Karin; Shapley, Alice; Sohn, Ji-Man; Surya, Arun; Treu, Tommaso; Wang, Eric; Warad, Kanaka; Weber, Robert; Wiley, James; Wizinowich, Peter; Wong, Michael H.; Yeh, Sherry (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-06)
    Liger is a next-generation near-infrared (0.81 - 2.45 µm) integral field spectrograph (IFS) and imaging camera for the W. M. Keck Observatory (WMKO) adaptive optics (AO) system. The instrument concept originated by ...
  • Simulation and experimental study of the OTF based alignment and phasing of segmented mirrors 
    Radhika, Dharmadhikari; Parihar, P. S (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-06)
    For a segmented mirror telescope, the desired resolution can only be achieved when all the segments are precisely co-aligned, co-focused and co-phased. The process of minimization of the piston errors is called co-phasing, ...
  • Daytime turbulence strength profile measurement at Kodaikanal Observatory 
    Saraswathi Kalyani, S; Sridharan, R; Prasanna, Deshmukh; Nair, B. G; Mahesh Babu, S (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-07)
    The Indian Institute of Astrophysics is developing a Multi-Conjugate Adaptive Optics system for the Kodaikanal Tower Telescope. In this context, we measured the daytime turbulence strength profile at the Kodaikanal ...
  • Design and Simulation of 6.2m Wide-Field Telescope for Spectroscopic Survey 
    Prasanna, Deshmukh; Sriram, S; Chand, Totan; Kambhala, Sudharsan; Ramya, S; Joshi, Ravi; Bharat Kumar, Y; Muthahar, R. Mohammed (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-06)
    The upcoming large astronomical telescopes are trending towards the Segmented Primary Mirror due to technological advancements & manufacturing feasibility. We have designed a wide-field optical IR spectroscopic survey ...
  • Forward modelling of turbulence strength profile estimation using S-DIMM+ 
    Saraswathi Kalyani, S; Sridharan, R (SPIE - Society of Photo-Optical Instrumentation Engineers, 2023-05)
    Knowledge of the refractive index structure constant profile at an astronomical site is crucial before developing a Multi-Conjugate Adaptive Optics (MCAO) system at that site. The S-DIMM+ (S-Differential Image Motion Monitor+) ...
  • Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph 
    Das, Tanya; Banyal, R. K; Sivarani, T; Sriram, S (SPIE - Society of Photo-Optical Instrumentation Engineers, 2020-12)
    Precision Doppler spectroscopy serves as an important tool for Radial Velocity (RV) measurements by observing Doppler shift in the stellar spectrum, which are used for various applications. Passively stabilized Fabry-Perot (FP) ...
  • Ground calibration of visible emission line coronagraph on board Aditya-L1 mission 
    Prasad, B. R; Venkata Suresh, Narra; Natarajan, V; Somasundaram, P. K; Kamath, P. U; Mishra, Shalabh; Hegde, Bhavana; Sasikumar Raja, K; Singh, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2023-10)
    Visible emission line coronagraph (VELC) is the prime payload on board India’s first space solar observatory Aditya-L1. VELC is a unique payload with simultaneous observational capabilities in imaging, spectroscopy, and ...

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