IIA Institutional Repository: Recent submissions

  • A multi-functional fiber positioning system for extremely large telescopes 
    Manjunath, B; Sivarani, T; Surya, Arun; Yadav, Sudharsan; Unni, Athira; Parvathy, M; Divakar, Devika; Sriram, S; Prakash, A; Hasan, Amirul (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-07)
    We present a conceptual design for a fiber positioning system for multi-object high-resolution spectroscopy, designed to be compatible with the upcoming large telescopes with a wide field of view. The design incorporates ...
  • Characterizing exoplanet atmospheres with SCALES medium-spectral-resolution angular differential imaging 
    Desai, Aditi; Sallum, Steph; Banyal, R. K; Batalha, Natalie; Batalha, Natasha; Blake, Geoff; Brandt, Tim; Briesemeister, Zack; Kleer, Katherine de; Pater, Imke de; Eisner, Josh; Fong, Wen-fai; Greene, Tom; Honda, Mitsuhiko; Kain, Isabel; Kilpatrick, Charlie; Lach, Mackenzie; Liu, Mike; Macintosh, Bruce; Martinez, Raquel A.; Mawet, Dimitri; Miles, Brittany; Morley, Caroline; Powell, Diana; Sheehan, Patrick; Skemer, Andrew J.; Stelter, R. Deno; Stone, Jordan; Surya, Arun; Sivarani, T; Wagner, Kevin; Zhou, Yifan (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-07)
    SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) is a high-contrast lenslet-based integral field spectrograph (IFS) designed to characterize exoplanet atmospheres in the 2 - 5 micron wavelength ...
  • Performance analysis of SCALES final optical design: End to End Modeling 
    Surya, Arun; Kupke, Renate; Stelter, Deno; Hinz, Phil; Sallum, Stephanie; Hasan, Amirul; Skemer, Andrew; Sivarani, T; Banyal, R. K; Unni, Athira (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-07)
    The SCALES instrument is a high-contrast imager and integral field spectrograph that operates in the infrared wavelength and is intended to be utilized behind W.M. Keck Observatory’s adaptive optics system. The instrument ...
  • Probing chromospheric magnetic field through multi-line spectropolarimetry 
    Mathur, Harsh (Indian Institute of Astrophysics, 2024)
    The chromosphere, situated between the bright photosphere and the remarkably thin transition region that precedes the million-degrees hot corona, is a highly dynamic and intricate layer within the solar atmosphere. By ...
  • Solar Multi-Conjugate Adaptive Optics 
    Saraswathi Kalyani, S (Indian Institute of Astrophysics, 2024)
    Ground-based telescopes are severely limited in their performance by the turbulence of the Earth’s atmosphere. The wavefronts emitted by the celestial bodies are perturbed and we lose high spatial frequency information. ...
  • Design of AO and MCAO systems for Kodaikanal Tower Telescope 
    Saraswathi Kalyani, S; Sridharan, R (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    The Indian Institute of Astrophysics is deliberating the development of a 2-m class Solar telescope called NLST (National Large Solar Telescope) at Merak, Ladakh. It will be equipped with an adaptive optics system to realize ...
  • Differential optical transfer function (dOTF) wavefront sensing with the SPEED test-bed 
    Radhika, Dharmadhikari; Martinez, P; Gouvret, C; Marcotto, A; Spang, A; Dejonghe, J; Beaulieu, M; Sallard, C (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    Differential optical transfer function (dOTF) is a model-independent image-based wavefront sensor for measuring the complex field. This sensor-less wavefront sensing technique is efficient for precise non-common path ...
  • Revisiting optical transfer function-based focal plane wavefront sensors for correcting NCPAs 
    Martinez, P; Radhika, Dharmadhikari; Spang, A (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    We examine several focal plane wavefront sensing (FPWFS) approaches from a theoretical perspective, specifically comparing their fundamental origins and similarities. We consider various techniques, including the differential ...
  • CubeOps: development of an STM32-based on-board computer (OBC) for small satellites and CubeSat missions 
    Shubham Jankiram, Ghatul; Bharat Chandra, P; Jain, Shubhangi; Binukumar, G; Mahesh Babu, S; Mohan, Rekhesh; Safonova, M; Murthy, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    We present here an STM32 microcontroller based on-board computer designed for use in small satellites and CubeSat missions that was developed using commercial-off-the-shelf (COTS) electronics components. An onboard computer ...
  • Design of a precision cryogenic rotary stage for optic or mask selection for the SCALES instrument mounted to the Keck 2 Telescope 
    Ratliff, Chris; MacDonald, Nicholas; Cabak, J; Deich, Will; Sandford, Dale; Gonzales, Michael; Skemer, Andrew; Sallum, Stephanie; Stelter, Deno; Hunter, A; Kupke, Renate; Dillon, Daren; Marques, D; Rodriguez, C; Savage, M; Kassis, Marc; Lyke, J; Hasan, Amirul (SPIE-Society of Photo-Optical Instrumentation Engineers, 2024-08)
    SCALES is a new instrument that will be mounted on the Keck 2 Telescope just downstream of the Keck 2 AO system. SCALES is designed to take spectra of directly imaged exoplanets at multiple wavelengths in the thermal ...
  • Comparative analysis study of 43-point and 27-point buyoff stations for stressed mirror polishing (SMP) metrology 
    Basheer, Alikhan; Panchal, Pramod; Jha, Sanjeev K; Sudharsan, K; Prasanna Deshmukh; Valsan, Vineeth; Sriram, S (SPIE-Society of Photo-Optical Instrumentation Engineers, 2024-08)
    As a collaborative effort within the Thirty Meter Telescope (TMT) project, India is committed to supplying 84 polished segments for the primary mirror, employing the innovative Stressed Mirror Polishing (SMP) technology ...
  • Thermal sensitivity analysis of 2D profilometer used for TMT polished glass polishing 
    Panchal, Pramod; Jha, Sanjeev K; Basheer, Alikhan; Valsan, Vineeth; Prasanna Deshmukh; Sriram, S (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    TMT adopts Stressed Mirror Polishing (SMP) technology for the polishing of mirror segments. In this process, the meniscus type spherical shape glass blanks are converted in to a desired aspheric shape by spherical grinding ...
  • Slitless spectroscopy simulations of Milky Way dwarf satellite galaxies using TMT-WFOS 
    Divakar, Devika; Sivarani, T; Sethuram, Ramya; Fucik, Jason; Steidel, Chuck; Manjunath, B; Prasanna Deshmukh (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    Wide Field Optical Spectrograph (WFOS) is the first light instrument of Thirty Meter Telescope (TMT), which will be one of the wide field spectrographs for optical spectroscopy and can probe the faintest limits. In order ...
  • Indian Institute of Astrophysics Annual Report: 2023-24 
    Subramaniam, A (Indian Institute of Astrophysics, 2024)
  • Indian Institute of Astrophysics Annual Report: 2022-23 
    Subramaniam, A (Indian Institute of Astrophysics, 2023)
  • Unraveling the kinematic and morphological evolution of the small magellanic cloud 
    Dhanush, S. R; Subramaniam, A; Subramanian, S (American Astronomical Society, 2025-02-10)
    We model the kinematics of the Small Magellanic Cloud (SMC) by analyzing the proper motions (PMs) from Gaia DR3 of nine different stellar populations, including young main-sequence (MS) stars (<2 Gyr), red giant branch ...
  • DA 362: a gamma-ray-emitting compact symmetric object 
    Swain, Subhashree; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (American Astronomical Society, 2025-02-01)
    The γ-ray detection from an astrophysical object indicates the presence of an extreme environment where highenergy radiation is produced. With the continuous monitoring of the γ-ray sky by the Fermi Large Area Telescope ...
  • Magnetic topology of quiet-Sun Ellerman bombs and associated ultraviolet brightenings 
    Bhatnagar, Aditi; Avijeet Prasad; Rouppe van der Voort, L; Nobrega-Siverio, Daniel; Joshi, Jayant (EDP Sciences, 2025-01)
    Context. Quiet-Sun Ellerman bombs (QSEBs) are small-scale magnetic reconnection events in the lower atmosphere of the quiet Sun. Recent work has shown that a small percentage of them can occur co-spatially and co-temporally ...
  • Detection of enhanced germanium in a new cool extreme helium star A980: insights and implications 
    Saini, Ajay Kumar; Pandey, G (American Astronomical Society, 2025-02-01)
    A fine abundance analysis of a recently discovered hydrogen-deficient carbon (HdC) star, A980, is presented. Based on the observed high-resolution optical spectrum, we ascertain that A980 is a cool extreme helium (EHe) ...
  • Excess ultraviolet emission at high galactic latitudes: a new horizons view 
    Murthy, Jayant; Shull, J. Michael; Postman, Marc; Parker, Joel Wm; Redfield, Seth; Cunningham, Nathaniel; Gladstone, G. Randall; Pineau, Jon P; Brandt, Pontus; Verbiscer, Anne J.; Singer, Kelsi N; Weaver, H. A; Henry, R. C; Stern, S. Alan (American Astronomical Society, 2025-02)
    We present new observations of the cosmic ultraviolet background (CUVB) at high Galactic latitudes (|b| > 40o ), made using the Alice UV spectrograph on board the New Horizons spacecraft. These observations were taken at ...

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