IIA Institutional Repository: Recent submissions

  • 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 ...
  • Near Ultraviolet Spectrograph for Balloon Platform 
    Sreejith, A. G; Safonova, M; Murthy, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2015-06)
    Small and compact scientific payloads may be easily designed constructed and flown on high altitude balloons. Despite the fact that large orbital observatories provide accurate observations and statistical studies of ...
  • A New Software Tool to Predict Astrometric Errors for ELTs 
    Ranka, Trupti; Chamarthi, Sireesha; Surya, Arun; Schock, Matthias; Lu, Jessica (SPIE - Society of Photo-Optical Instrumentation Engineers, 2020-12)
    Extremely Large Telescopes (ELTs) have precision requirements of a few tens of micro-arcsec for differential astrometry science cases. Each ELT project has its own astrometric error budget taking into consideration ...
  • PIONS: a CubeSat imager to observe variable UV sources 
    Ambily, S; Mathew, J; Sarpotdar, Mayuresh; Murthy, J; Aggarval, V. K; Nagabhushanam, S; Rao, Divya A; Jeeragal, Sachin; Nirmal, K; Sreejith, A. G; Binukumar, G; Safonova, M (SPIE - Society of Photo-Optical Instrumentation Engineers, 2018-07)
    The Pesit/IIA Observatory for the Night Sky(PIONS) is a near UV imaging telescope to be flown on a small satellite. The instrument is a 150mm RC telescope that covers a wavelength range of 180-280 nm. We are using an ...
  • Optical design of FOSC and wide field aberration corrector for the prototype segmented mirror telescope 
    Radhika, Dharmadhikari; Jacob, Annu; Parihar, P (SPIE - Society of Photo-Optical Instrumentation Engineers, 2023-05)
    The Prototype Segmented Mirror Telescope (PSMT) is a 1.3m segmented mirror telescope that aims to develop and demonstrate the segmented mirror technology indigenously. The telescope design includes a spherical primary with ...
  • Investigating star-planet properties of different exoplanet populations 
    Swastik, C (Indian Institute of Astrophysics, 2024-03)
    Numerous groundbreaking discoveries have been made in exoplanet science over the past decade. Recent exoplanet search surveys have provided compelling evidence that planets are exceedingly common, with the majority of ...
  • Investigating the Disk – Halo Connection using Numerical Simulations 
    Ansar, Sioree (Indian Institute of Astrophysics, 2024-03)
    Investigating stellar structures such as stellar bars within the central regions of galaxies holds promise as a means to examine the properties of dark matter halos associated with those galaxies. Cosmological simulations ...
  • How does dark matter stabilize disc galaxies? 
    Aditya, K (Oxford University Press on behalf of Royal Astronomical Society, 2024-08)
    The study presents a theoretical framework for understanding the role of dark matter on the stability of the galactic disc. We model the galaxy as a two-component system consisting of stars and gas in equilibrium with an ...
  • Thermal and magnetic field structure of near-equatorial coronal holes 
    Hegde, M; Hiremath, K. M (EDP Sciences, 2024-08)
    Context. Coronal holes are low-density and unipolar magnetic field structures in the solar corona that trigger geomagnetic disturbances on the Earth. Hence, it is important to understand the genesis and evolutionary behavior ...
  • UOCS XIV. Uncovering extremely low-mass white dwarfs and blue lurkers in NGC 752 
    Jadhav, Vikrant V; Subramaniam, A; Sagar, R (EDP Sciences, 2024-08)
    Context. Evolutionary pathways of binary systems are vastly different from single stellar evolution, and thus there is a need to quantify their frequency and diversity. Thanks to their to their coeval nature, open clusters ...
  • FLAME: Fitting Lyα absorption lines using machine learning 
    Jalan, P; Khaire, V; Vivek, M; Gaikwad, P (EDP Sciences, 2024-08)
    We introduce FLAME, a machine-learning algorithm designed to fit Voigt profiles to H I Lyman-alpha (Lyα) absorption lines using deep convolutional neural networks. FLAME integrates two algorithms: the first determines the ...
  • Spectropolarimetric view of the gamma-ray emitting NLS1 1H0323 + 342 
    Jose, Jincen; Rakshit, Suvendu; Panda, Swayamtrupta; Woo, Jong-Hak; Stalin, C. S; Neha, Sharma; Pandey, Shivangi (Oxford University Press on behalf of Royal Astronomical Society, 2024-08)
    The gamma-ray emitting narrow-line Seyfert 1 galaxies are a unique class of objects that launch powerful jets from relatively lower-mass black hole systems compared to the Blazars. However, the black hole masses estimated ...

Search DSpace

Browse

My Account