IIA Institutional Repository: Recent submissions

  • Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 
    Sicardy, B; Tej, A; Gomes-Júnior, A. R; Romanov, F. D; Bertrand, T; Ashok, N. M; Lellouch, E; Morgado, B. E; Assafin, M; Desmars, J; Camargo, J. I. B; Kilic, Y; Ortiz, J. L; Vieira-Martins, R; Braga-Ribas, F; Ninan, J. P; Bhatt, B. C; Pramod Kumar, S; Swain, V; Sharma, S; Saha, A; Ojha, D. K; Pawar, G; Deshmukh, S; Deshpande, A; Ganesh, S; Jain, J. K; Mathew, S. K; Kumar, H; Bhalerao, V; Anupama, G. C; Barway, Sudhanshu; Brandeker, A; Floren, H. G; Olofsson, G; Bruno, G; Mao, Y. M; Ye, R. H; Zou, Q. Y; Sun, Y. K; Shen, Y. Y; Zhao, J. Y; Grishin, D. N; Romanova, L. V; Marchis, F; Fukui, K; Kukita, R; Benedetti-Rossi, G; Santos-Sanz, P; Dhyani, N; Gokhale, A; Kate, A (EDP Sciences, 2024-02)
    Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the ...
  • Changes in Photospheric Lorentz Force in Eruptive and Confined Solar Flares 
    Maity, Samriddhi Sankar; Sarkar, Ranadeep; Chatterjee, Piyali; Srivastava, Nandita (American Astronomical Society, 2024-02-10)
    Solar flares are known to leave imprints on the magnetic field in the photosphere, often manifested as an abrupt and permanent change in the downward-directed Lorentz force in localized areas inside the active region. Our ...
  • രാജ്യാന്തര വനിതാ ദിനാചരണം; വനിതാരത്ന പുരസ്കാരങ്ങള്‍ പ്രഖ്യാപിച്ച് മന്ത്രി വീണാ ജോർജ് 
    manoramaONLINE (Malayala Manorama Company, 2024-03-06)
  • Relativistic Jet Motion in the Radio-quiet LINER Galaxy KISSR 872 
    Kharb, Preeti; Blackman, Eric G; Clausen-Brown, Eric; Mousumi Das; Schwartz, Daniel A; Siemiginowska, Aneta; Subramanian, S; Vaddi, Sravani (American Astronomical Society, 2024-02-20)
    We report superluminal jet motion with an apparent speed of βapp = 1.65 ± 0.57 in the radio-quiet (RQ) lowionization nuclear emission-line region (LINER) galaxy KISSR 872. This result comes from two-epoch phasereferenced ...
  • Filamentary network and magnetic field structures revealed with BISTRO in the highmass star-forming region NGC 2264: global properties and local magnetogravitational configurations 
    Wang, Jia-Wei; Koch, Patrick M; Clarke, Seamus D; Fuller, Gary; Peretto, Nicolas; Tang, Ya-Wen; Yen, Hsi-Wei; Lai, Shih-Ping; Ohashi, Nagayoshi; Arzoumanian, Doris; Johnstone, Doug; Cho, Jungyeon; Liu, Hong-Li; Fanciullo, Lapo; Hwang, Jihye; Pattle, Kate; Poidevin, Frederick; Tahani, Mehrnoosh; Onaka, Takashi; Rawlings, Mark G; Chung, Eun Jung; Lin, Sheng-Jun; Liu, Junhao; Choi, Minho; Lyo, A-Ran; Priestley, Felix; Hoang, Thiem; Tamura, Motohide; Berry, David; Bastien, Pierre; Ching, Tao-Chung; Coude, Simon; Konyves, Vera; Kwon, Woojin; Chen, Mike; Choi, Yunhee; Eswaraiah, Chakali; Archana Soam; Hasegawa, Tetsuo; Qiu, Keping; Bourke, Tyler L; Byun, Do-Young; Chen, Zhiwei; Kang, Ji-hyun; Choi, Youngwoo; Chrysostomou, Antonio; Dai, Sophia; Francesco, James Di; Diep, Pham Ngoc; Li, Guangxing; Doi, Yasuo; Duan, Yan; Duan, Hao-Yuan; Eden, David; Kang, Miju; Fiege, Jason; Fissel, Laura M; Franzmann, Erica; Friberg, Per; Friesen, Rachel; Gledhill, Tim; Li, Di; Graves, Sarah; Greaves, Jane; Griffin, Matt; Karoly, Janik; Gu, Qilao; Han, Ilseung; Hayashi, Saeko; Houde, Martin; Inoue, Tsuyoshi; Iwasaki, Kazunari; Jeong, Il-Gyo; Kataoka, Akimasa; Kawabata, Koji; Khan, Zacariyya; Kim, Mi-Ryang; Kim, Kee-Tae; Lee, Chang Won; Kim, Kyoung Hee; Liu, Tie; Kim, Shinyoung; Kim, Jongsoo; Kim, Hyosung; Kim, Gwanjeong; Kirchschlager, Florian; Kirk, Jason; Kobayashi, Masato I. N; Kusune, Takayoshi; Tang, Xindi; Kwon, Jungmi; Lacaille, Kevin; Liu, Sheng-Yuan; Law, Chi-Yan; Lee, Sang-Sung; Lee, Hyeseung; Lee, Jeong-Eun; Lee, Chin-Fei; Li, Dalei; Li, Hua-bai; Thuong, Hoang Duc; Lu, Xing; Mairs, Steve; Matsumura, Masafumi; Matthews, Brenda; Moriarty-Schieven, Gerald; Furuya, Ray; Nagata, Tetsuya; Nakamura, Fumitaka; Nakanishi, Hiroyuki; Ngoc, Nguyen Bich; Tomisaka, Kohji; Park, Geumsook; Parsons, Harriet; Pyo, Tae-Soo; Qian, Lei; Rao, Ramprasad; Rawlings, Jonathan; Inutsuka, Shu-ichiro; Retter, Brendan; Richer, John; Rigby, Andrew; Tram, Le Ngoc; Sadavoy, Sarah; Saito, Hiro; Savini, Giorgio; Seta, Masumichi; Sharma, Ekta; Shimajiri, Yoshito; Shinnaga, Hiroko; Tsukamoto, Yusuke; Viti, Serena; Wang, Hongchi; Whitworth, Anthony; Wu, Jintai; Chen, Huei-Ru Vivien; Xie, Jinjin; Ward-Thompson, Derek; Yang, Meng-Zhe; Yoo, Hyunju; Yuan, Jinghua; Yun, Hyeong-Sik; Zenko, Tetsuya; Zhang, Chuan-Peng; Zhang, Yapeng; Zhang, Guoyin; Chen, Wen Ping; Zhou, Jianjun; Zhu, Lei; Gouellec, Valentin J. M. Le; Looze, Ilse de; Andre, Philippe; Dowell, C. Darren; Eyres, Stewart; Falle, Sam; Robitaille, Jean-Francois; Loo, Sven van (American Astronomical Society, 2024-02-20)
    We report 850 μm continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of the B-fields In STar forming Regions Observations large program on the James Clerk Maxwell ...
  • Data-driven Simulations of Magnetic Field Evolution in Active Region 11429: Magneto-frictional Method Using PENCIL CODE 
    Vemareddy, P; Warnecke, Jorn; Bourdin, Ph. A (IOP Publishing, 2024-02)
    Coronal magnetic fields evolve quasi-statically over long timescales and dynamically over short timescales. As of now there exist no regular measurements of coronal magnetic fields, and therefore generating the coronal ...
  • Spatiotemporal map of star clusters in the Magellanic Clouds using Gaia: synchronized peaks and radial shrinkage of cluster formation 
    Dhanush, S. R; Subramaniam, A; Nayak, Prasanta K; Subramanian, S (Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
    We present a detailed view of cluster formation (CF) to trace the evolution and interaction history of the Magellanic Clouds (MCs) in the last 3.5 Gyr. Using the Gaia DR3 data, we parametrized 1710 and 280 star clusters ...
  • Soft X-ray and FUV observations of Nova Her 2021 (V1674 Her) with AstroSat 
    Bhargava, Yash; Dewangan, Gulab Chand; Anupama, G. C; Kamath, U. S; Sonith, L. S; Singh, Kulinder Pal; Drake, J. J; Beardmore, A; Luna, G. J. M; Orio, M; Page, K. L (Published by Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
    Nova Her 2021 or V1674 Her was one of the fastest novae to be observed so far. We report here the results from our timing and spectral studies of the source observed at multiple epochs with AstroSat. We report the detection ...
  • Investigation of the correlation between optical and γ-ray flux variation in the blazar Ton 599 
    Rajput, Bhoomika; Mandal, Amit Kumar; Pandey, Ashwani; Stalin, C. S; Max-Moerbeck, Walter; Mathew, Blesson (Published by Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
    The correlation between optical and γ-ray flux variations in blazars reveals a complex behaviour. In this study, we present our analysis of the connection between changes in optical and γ-ray emissions in the blazar Ton ...
  • UOCS. XIII. Study of the Far-ultraviolet Bright Stars in the Open Cluster NGC 2420 Using AstroSat 
    Yadav, R. K. S; Dattatrey, Arvind K; Rangwal, Geeta; Subramaniam, A; Bisht, D; Sagar, R (American Astronomical Society, 2024-02-01)
    We present the study of four far-ultraviolet (FUV) bright stars in the field of the open cluster NGC 2420 using the Ultra Violet Imaging Telescope mounted on AstroSat. The three stars 525, 527, and 560 are members, while ...
  • Filament Eruption from Active Region 13283 Leading to a Fast Halo-CME and an Intense Geomagnetic Storm on 2023 April 23 
    Vemareddy, P (American Astronomical Society, 2024-02-01)
    Using multi-instrument and multiwavelength observations, we studied a coronal mass ejection (CME) that led to an intense geomagnetic storm on 2023 April 23. The eruption occurred on April 21 in solar active region (AR) ...
  • Unravelling the nature of explosion of thermonuclear supernovae 
    Dutta, Anirban (Indian Institute of Astrophysics, 2023-05)
    Type Ia supernovae (SNe Ia) result from thermonuclear explosions in binary systems consisting of at least one carbon-oxygen white dwarf. They are crucial for the understanding of galactic chemical composition as they are ...
  • High precision spectroscopy using stabilized Fabry-Perot Etalon 
    Das, Tanya (Indian Institute of Astrophysics, 2021)
    Accurate wavelength calibration is an important factor for any measure ment with high resolution spectrographs. Stellar spectrum comprises of dis crete absorption or emission lines whose position is precisely determined ...
  • Investigating the ultra-violet bright stars in star clusters 
    Rani, Sharmila (Indian Institute of Astrophysics, 2023-02)
    Star clusters are gravitationally bound systems composed of a large number of stars, ranging from thousands to millions. As the dynamic age of the cluster is less than the age of the universe, dynamical interactions ...
  • W. M. Keck observatory instrumentation status and future direction 
    Kassis, Marc; Allen, Steven L; Alverez, Carlos; Baker, Ashley; Banyal, Ravinder K; Bertz, Robert; Beichman, Charles; Brown, Aaron; Brown, Matthew; Bundy, Kevin; Cabak, Gerald; Cetre, Sylvain; Chin, Jason; Chun, Mark R; Cooke, Jeff; Delorme, Jacques; Deich, William; Dekany, Richard G; Devenot, Mark; Doppmann, Greg; Edelstein, Jerry; Fitzgerald, Michael P; Fucik, Jason R; Gao, Maodong; Gibson, Steve; Gillingham, Peter R; Gomez, Percy; Gottschalk, Colby; Halverson, Sam; Hill, Grant; Hinz, Philip; Holden, Bradford P; Howard, Andrew W; Jones, Tucker; Jovanovic, Nemanja; Kirby, Evan; Krishnan, Shanti; Kupke, Renate; Lanclos, Kyle; Larkin, James E; Leifer, Stephanie D; Lewis, Hilton A; Lilley, Scott; Lu, Jessica R; Lyke, James E; MacDonald, Nicholas; Martin, Christopher; Mather, John; Matuszewski, Mateusz; Mawet, Dimitri; McCarney, Ben; McGurk, Rosalie; Marin, Eduardo; Millar-Blanchaer, Maxwell A; Nance, Craig; Nash, Reston B; Neill, James D; O'Meara, John M; Peretz, Eliad; Poppett, Claire; Konopacky, Quinn; Radovan, Matthew V; Ragland, Sam; Rider, Kodi; Roberts, Mitsuko; Rockosi, Constance; Rubenzahl, Ryan; Sallum, Stephanie; Sandford, Dale; Savage, Maureen; Simha, Sunil; Skemer, Andy J; Steidel, Charles C; Stelter, Richard D; Surendran, Avinash; Walawender, Josh; Westfall, Kyle B; Wizinowich, Peter; Wright, Shelley; Yeh, Sherry (Wiley-VCH GmbH, 2023-10)
    Since the start of science operations in 1993, the twin 10-m W. M. Keck Observatory (WMKO) telescopes have continued to maximize their scientific impact and to produce transformative discoveries that keep the observing ...
  • β-SGP: Scaled Gradient Projection with β-divergence for astronomical image restoration 
    Gondhalekar, Y; Safonova, M; Saha, S (Elsevier B.V., 2023-07)
    Image restoration in astronomy has been considered a vital step in many ground-based observational programs that often suffer from sub-optimal seeing due to atmospheric turbulence, distortion of stellar shapes due to ...
  • Building a large affordable optical-NIR telescope (I): an alternate way to handle segmented primary mirror 
    Dharmadhikari, Radhika; Parihar, P; Jacob, A (Springer Nature, 2023-12)
    The use of innovative ideas and the latest technology have undoubtedly brought down telescope costs substantially. However, there are still ways to further reduce the cost of optical ground-based telescopes and make them ...
  • Statistical properties of galactic synchrotron temperature and polarization maps — a multi-frequency comparison 
    Fazlu, Rahman; Pravabati, C; Ghosh, Tuhin (IOP Publishing, 2024-01)
    Understanding the statistical properties of synchrotron emission from our Galaxy is valuable from the perspective of observations targeting signals of cosmological origin, as well as for understanding physical processes ...
  • Possibilities of identifying members from Milky Way satellite galaxies using unsupervised machine learning algorithms 
    Divakar, Devika K; Saraf, Pallavi; Sivarani, T; Doddamani, Vijayakumar H (Indian Academy of Sciences, 2024-06)
    A detailed study of stellar populations in Milky Way (MW) satellite galaxies remains an observational challenge due to their faintness and fewer spectroscopically confirmed member stars. We use unsupervised machine learning ...
  • Differential Rotation of the Solar Chromosphere: A Century-long Perspective from Kodaikanal Solar Observatory Ca II K Data 
    Mishra, Dibya Kirti; Routh, Srinjana; Jha, Bibhuti K; Chatzistergos, Theodosios; Basu, Judhajeet; Chatterjee, Subhamoy; Banerjee, D; Ermolli, Ilaria (American Astronomical Society, 2024-01-20)
    Chromospheric differential rotation is a key component in comprehending the atmospheric coupling between the chromosphere and the photosphere at different phases of the solar cycle. In this study, we therefore utilize the ...

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