IIA Institutional Repository: Recent submissions

  • 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 ...
  • The Sun's magnetic cycle: observations and modeling: The hydromagnetic dynamo 
    Chatterjee, Piyali (Elsevier, 2024)
    The Sun displays a plethora of visually awe-inspiring phenomena including flares, prominences, sunspots, corona, CMEs, and uncountable others. The solar magnetic field controls the dynamics and topology of all these, as ...
  • Simultaneous Spectropolarimetric Observations in the Hα and Ca II 8662Å Lines of an Active Region 
    Mathur, Harsh; Nagaraju, K; Yadav, Rahul; Joshi, Jayant (American Astronomical Society, 2024-08-10)
    We present spectropolarimetric observations of an active region recorded simultaneously in the Hα and the Ca II 8662 Å lines. The sunspot exhibits multiple structures, including a light bridge and a region where the Ca ...
  • Exploring the Archives: A Search for Novae in UVIT Snapshots of M31 
    Basu, Judhajeet; Krishnendu, S; Barway, Sudhanshu; Chamoli, Shatakshi; Anupama, G. C (American Astronomical Society, 2024-08-10)
    Extensive multiwavelength studies of novae have been carried out in our galaxy and in M31 for decades. However, UV studies of extragalactic novae are limited, especially those in quiescence. For the first time, we present ...
  • Extreme-ultraviolet Polarimetric Diagnostics of the Solar Corona: The Hanle Effect of Ne VIII 770Å 
    Khan, Raveena; Gibson, Sarah E; Casini, Roberto; Nagaraju, K (American Astronomical Society, 2024-08-10)
    Magnetic fields are the primary driver of the plasma thermodynamics in the upper solar atmosphere, especially in the corona. However, magnetic field measurements in the solar corona are sporadic, thereby limiting us from ...
  • Prediction of the amplitude of solar cycle 25 from the ratio of sunspot number to sunspot-group area, low latitude activity, and 130-year solar cycle 
    Javaraiah, J (Elsevier B.V, 2024-08-01)
    Prediction of the amplitude of solar cycle is important for understanding the mechanism of solar cycle and solar activity influence on space-weather. We analysed the combined data of sunspot groups from Greenwich ...
  • Mode identification and period fitting in six pulsating hot subdwarfs 
    Sahoo, S. K; Baran, A. S; Nemeth, P; Worters, H. L; Pramod Kumar, S; Joshi, S; Kilkenny, D (Cambridge University Press on behalf of Astronomical Society of Australia, 2024-07)
    We report the results of our analysis of six gravity-mode pulsating hot subdwarf stars observed in the short cadence mode by Transiting Exoplanet Survey Satellite. We detected at least 10 pulsation periods in each star, ...
  • Analysis of Gaia DR3 data of selected high galactic latitude H-alpha emission stars 
    Parthasarathy, M (American Astronomical Society, 2024-07)
    Gaia DR3 data of 52 high galactic latitude Hα emission stars selected from the paper of Stephenson are analyzed. Ten new variable stars and eight new high velocity stars have been found. Details of six post-AGB stars and ...
  • Characterization of the Atmospheres of Terrestrial Exoplanets 
    Singla, Manika (Indian Institute of Astrophysics, 2023-04)
    Context: Over 5,000 exoplanets have been discovered to date, yet our knowledge of their atmospheres is still quite limited, and we have not yet identified any truly habitable exoplanets. It is the high time to characterize the ...
  • A Partial Near-infrared Guide Star Catalog for Thirty Meter Telescope Operations 
    Shah, Sarang; Subramanian, S; Avinash, Ck; Andersen, David R; Skidmore, Warren; Anupama, G. C; Delgado, Francisco; Gillies, Kim; Maheshwar, G; Ramaprakash, A. N; Reddy, B. E; Sivarani, T; Subramaniam, A (American Astronomical Society, 2024-08-01)
    At first light, the Thirty Meter Telescope (TMT) near-infrared (NIR) instruments will be fed by a multiconjugate adaptive optics instrument known as the Narrow Field Infrared Adaptive Optics System (NFIRAOS). NFIRAOS will ...

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