IIAP Publications: Recent submissions

  • Low-frequency radio view of a fast-blue optical transient - AT2018cow 
    Nayana, A. J; Chandra, Poonam (Cambridge University Press on behalf of International Astronomical Union, 2024)
    We present low-frequency (0.40 – 1.25 GHz) radio observations and modeling of a Fast Blue Optical Transient (FBOT), AT2018cow [Nayana & Chandra(2021)]. Our data are best modeled as an inhomogeneous synchrotron emitting ...
  • Differential rotation of the solar chromosphere using multidecadal Ca ii K spectroheliograms 
    Mishra, Dibya Kirti; Routh, Srinjana; Jha, Bibhuti K; Chatterjee, Subhamoy; Banerjee, D (Cambridge University Press on behalf of International Astronomical Union, 2024)
    The study of the differential rotation in the chromosphere of the Sun is of significant importance as it provides valuable insights into the rotational behaviour of the solar atmosphere at higher altitudes and the coupling ...
  • AGN outflows and its variability 
    Vivek, M; Nair, Akhil; Mishra, Sapna (Cambridge University Press on behalf of International Astronomical Union, 2024)
    The radiative mode of AGN feedback, operated through outflows, plays an essential role in the evolution of galaxies. Quasar outflows are detected as blue-shifted broad absorption lines in the UV/optical spectra of quasars. ...
  • A study in scarlet: I. Photometric properties of a sample of intermediate-luminosity red transients 
    Valerin, G; Pastorello, A; Reguitti, A; Benetti, S; Cai, Y. Z; Chen, T. W; Eappachen, D; Elias-Rosa, N; Fraser, M; Gangopadhyay, A; Hsiao, E. Y; Inserra, Cosimo; Izzo, Luca; Jencson, Jacob E; Kankare, E; Kotak, R; Mazzali, P. A; Misra, K; Pignata, G; Prentice, S. J; Sand, D. J; Smartt, S. J; Stritzinger, M. D; Tartaglia, L; Valenti, S; Anderson, Joseph P; Andrews, J. E; Amaro, R. C; Brennan, S; Bufano, F; Callis, E; Cappellaro, E; Dastidar, R; Della Valle, M; Fiore, Achille; Fulton, Michael D; Galbany, L; Heikkila, T; Hiramatsu, Daichi; Karamehmetoglu, E; Kuncarayakti, H; Leloudas, Giorgos; Lundquist, M; McCully, Curtis; Muller-Bravo, T. E; Nicholl, M; Ochner, P; Padilla Gonzalez, E; Paraskeva, Emmy; Pellegrino, Craig; Rau, A; Reichart, D. E; Reynolds, Thomas M; Roy, R; Salmaso, I; Singh, Mridweeka; Turatto, M; Tomasella, L; Wyatt, S; Young, D. R (EDP Sciences, 2025-03)
    Aims. We investigate the photometric characteristics of a sample of intermediate-luminosity red transients (ILRTs), a class of elusive objects with peak luminosity between that of classical novae and standard supernovae. ...
  • A study in scarlet: II. Spectroscopic properties of a sample of intermediate-luminosity red transients 
    Valerin, G; Pastorello, A; Mason, E; Reguitti, A; Benetti, S; Cai, Y. Z; Chen, T. W; Eappachen, D; Elias-Rosa, N; Fraser, M; Gangopadhyay, A; Hsiao, E. Y; Howell, D. A; Inserra, Cosimo; Izzo, Luca; Jencson, Jacob E; Kankare, E; Kotak, R; Lundqvist, P; Mazzali, P. A; Misra, K; Pignata, G; Prentice, S. J; Sand, D. J; Smartt, S. J; Stritzinger, M. D; Tartaglia, L; Valenti, S; Anderson, Joseph P; Andrews, J. E; Amaro, R. C; Barbarino, C; Brennan, S; Bufano, F; Callis, E; Cappellaro, E; Dastidar, R; Della Valle, M; Fiore, Achille; Fulton, Michael D; Galbany, L; Gromadzki, Mariusz; Heikkila, T; Hiramatsu, Daichi; Karamehmetoglu, E; Kuncarayakti, H; Leloudas, Giorgos; Limongi, M; Lundquist, M; McCully, Curtis; Muller-Bravo, T. E; Nicholl, M; Ochner, P; Padilla Gonzalez, E; Paraskeva, Emmy; Pellegrino, Craig; Rau, A; Reichart, D. E; Reynolds, Thomas M; Roy, R; Salmaso, I; Shahbandeh, M; Singh, Mridweeka; Sollerman, Jesper; Turatto, M; Tomasella, L; Wyatt, S; Young, D. R (EDP Sciences, 2025-03)
    Aims. We investigate the spectroscopic characteristics of intermediate-luminosity Red Transients (ILRTs), a class of elusive objects with peak luminosity between that of classical novae and standard supernovae. Our goal ...
  • Unveiling the kinematics of a central region in the triple-AGN host NGC 7733-7734 interacting group 
    Keshri, Saili; Barway, Sudhanshu; Mousumi Das; Yadav, Jyoti; Combes, Francoise (EDP Sciences, 2025-03)
    We present a detailed study of the interacting triple active galactic nuclear system, NGC 7733-34, focusing on stellar kinematics, ionised gas characteristics, and star formation within the central region and stellar bars ...
  • Baryonic ecosystem in galaxies (BEINGMgII): I. host galaxies of ultra-strong Mg II absorbers in the Subaru Hyper Suprime-Cam Survey 
    Joshi, Ravi; Das, S; Fumagalli, Michele; Fossati, Matteo; Peroux, Celine; Chaudhary, Reena; Yesuf, Hassen; Ho, Luis C (EDP Sciences, 2025-03)
    Context. We study the galaxies hosting ultra-strong Mg II (USMgII) absorbers at small impact parameters of ∼2″ (5‑20 kpc) spanning a redshift range of 0.4 ≤ z ≤ 1.7 using deep high-resolution images from the Hyper Suprime-Cam ...
  • Discovery and detailed study of the M31 Classical Nova AT 2023tkw: evidence for internal shocks 
    Basu, Judhajeet; Kumar, Ravi; Anupama, G. C; Barway, Sudhanshu; Hauschildt, Peter H.; Chamoli, Shatakshi; Swain, Vishwajeet; Bhalero, Varun; Karambelkar, Viraj; Kasliwal, Mansi; Das, Kaustav K; Andreoni, Igor; Singh, Avinash; Teja, Rishabh Singh (American Astronomical Society, 2025-02-10)
    We present a detailed analysis of an extragalactic slow classical nova in M31 exhibiting multiple peaks in its light curve. Spectroscopic and photometric observations were used to investigate the underlying physical ...
  • SN 2018is: a low-luminosity type IIP supernova with narrow hydrogen emission lines at early phases 
    Dastidar, R; Misra, K; Valenti, S; Sand, D. J; Pastorello, A; Reguitti, A; Pignata, G; Benetti, S; Bose, S; Gangopadhyay, A; Singh, Mridweeka; Tomasella, L; Andrews, J. E; Arcavi, I; Ashall, C; Bilinski, C; Bostroem, K. A; Buckley, D A. H; Cannizzaro, G; Chomiuk, L; Congiu, E; Dong, S; Dong, Y; Elias-Rosa, N; Fraser, M; Gall, C; Gromadzki, M; Hiramatsu, D; Hosseinzadeh, G; Howell, D. A; Hsiao, E. Y; McCully, C; Smith, N; Strader, J (EDP Sciences, 2025-02)
    We present a comprehensive photometric and spectroscopic study of the Type IIP supernova (SN) 2018is. The V band luminosity and the expansion velocity at 50 days post-explosion are −15.1 ± 0.2 mag (corrected for AV = 1.34 ...
  • 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 ...

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