IIA Institutional Repository: Recent submissions

  • Human resource development in astronomy: An Indian perspective 
    Bagla, Jasjeet Singh; Mousumi Das; Datta, Abhirup; Gogoi, Rupjyoti; Hota, A; Kembhavi, A. K; Malik, M. A; Misra, R; Pai, Archana; Pandey, Shashi Bhushan; Pandey, S. K; Rastogi, Shantanu; Ravikumar, C. D (Indian Academy of Sciences, 2025-06)
    In the 21st century, astronomy is one of the frontier research areas, and several astronomical observatories are planned worldwide with active international collaborations. India has been actively participating in many ...
  • Stars and stellar populations in Milky Way and the nearby galaxies 
    Sivarani, T; Subramanian, S; Bandyopadhyay, A; Banerjee, Projjwal; Bhattacharya, Souradeep; Choudhury, S; Ghosh, S; Hema, B. P; Jog, Chanda; Hota, A; Yogesh, Joshi; Karinkuzhi, D; Maitra, Chandreyee; Malhan, Khyati; Nayak, Prasanta K; Pandey, G; Reddy, Eswar; Sarkar, Suchira; Sharma, Mahavir; Singh, Gaurav; Verma, Kuldeep; Bharat Kumar, Y (Indian Academy of Sciences, 2025-06)
    This article addresses key open questions in the Milky Way and neighboring galaxies, focusing on utilizing stars and stellar populations to trace galaxy formation and evolution processes. It offers an overview of the current ...
  • High lithium abundance connection with the chromospheric helium in red giants: spectroscopic and asteroseismic analyses 
    Mallick, Anohita; Sneden, C; Reddy, B. E; Afsar, Melike (American Astronomical Society, 2025-02-20)
    We present a study of correlations between high Li abundances and strong chromospheric He i λ10830 absorption-line strengths in Kepler field giant stars. Our sample includes 84 giants with detectable solar-like oscillations ...
  • Analyses of features of magnetic cycles at different amounts of dynamo supercriticality: solar dynamo is about two times critical 
    Wavhal, Sanket; Pawan Kumar, S; Karak, B. B (Springer Nature, 2025-02)
    The growth of a large-scale magnetic field in the Sun and stars is usually possible when the dynamo number (D) is above a critical value Dc. As the star ages, its rotation rate and thus D decrease. Hence, the question is ...
  • 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; Kirby, Evan; Karalidi, Theodora; Konopacky, 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, 2024-07)
    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 coupling ...
  • SCALES Status Report 
    Stelter, R. Deno; Skemer, Andrew J.; Sallum, Stephanie; MacDonald, Nicholas; Kupke, Renate; Ratlif, Christopher; Bourgenot, Cyril; Cabak, Gerald; Gonzales, Michael; Rodriguez, Cristian A.; Hunter, Aaron; Banyal, R. K; Sivarani, T; Fitzgerald, Michael P.; Kassis, Marc; Absil, Olivier; Alvarez, Carlos; Batalha, Natasha; Boucher, Marc-Andre; Brandt, Timothy; Briesemeister, Zack; Kleer, Katherine de; Pater, Imke de; Deich, William; Divakar, Devika; Gauvin, Etienne; Greene, Thomas; Hasan, Amirul; Hinz, Philip; Jensen-Clem, Rebecca; Johnson, Christopher; Govinda, K. V; Kain, Isabel; Lach, Mackenzie; Landry, Jean-Thomas; Liu, Michael C.; Lyke, James; Magnone, Kenneth; Marin, Eduardo; Martinez, Raquel A.; Mawet, Dimitri; McGurk, Rosalie; Miles, Brittany; Prakash, A; Sandford, Dale; Ramya, S; Sheehan, Patrick; Sohn, Ji Man; Stone, Jordan; Surya, Arun; Varshney, Hari Mohan; Wang, Eric (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-07)
    SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) is the next-generation, diffraction-limited, thermal infrared, fully cryogenic, coronagraphic exoplanet spectrograph and imager for W.M. Keck ...
  • Ultraviolet Extinction Sky Survey (UVESS): a mission concept for probing the interstellar medium in the Milky Way and Local Group galaxies 
    Mathew, J; Battisti, Andrew; Vaughn, Israel; Jain, Shubhangi; Mohan, Rekhesh; Murthy, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    The 2175 Å bump shows considerable variations in its strength, width, and central wavelength when observed along different sightlines in the Milky Way and other galaxies. These variations offer valuable insights into the ...
  • Advancements in space-based NUV spectrography: Precision fabrication and evaluation of an optical slit using optical lithography and deep reactive ion etching 
    Binukumar, G; Bharat Chandra, P; Safonova, M; Sultana, Sabiha; Yadhukrishnan, S. V; Nawaz, N; Shubham Jankiram, Ghatul; Jain, Shubhangi; Mahesh Babu, S; Mohan, Rekhesh; Murthy, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    This article describes the development of a space-based near-Ultraviolet (NUV) spectrograph, focusing on the intricate fabrication and meticulous evaluation of an optical slit employing advanced techniques such as optical ...
  • Digital Micro-Mirror Device (DMD) Controller Development for INSIST Mission 
    Amit Kumar; Sisira, P. K; Prasanna Deshmukh; Phanindra, D. V. S (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    The Indian Spectroscopic and Imaging Space Telescope (INSIST) is a UV-optical 1m class space telescope expected to produce high-quality imaging and moderate-resolution spectra of astronomical sources. A Digital Micro-Mirror ...
  • 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 ...

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