IIA Institutional Repository: Recent submissions

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • 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 ...
  • 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+) ...
  • 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) ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...

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