IIA Institutional Repository: Recent submissions

  • The Stability of Fiber Spectrographs in the Faint-source Regime 
    Bundy, Kevin; Law, David; MacDonald, Nick; Westfall, Kyle B.; Sivarani, T; Divakar, Devika; Bershady, Matthew; Gu, Meng; Yan, Renbin; Roy, Namrata; Poppett, Claire; Drory, Niv (American Astronomical Society, 2022-09-01)
    The use of optical fibers in astronomical instrumentation offers high-multiplex and light-gathering flexibility. However, with most previous fiber spectrographs optimized for large fields of view on modest-aperture telescopes, ...
  • Long-term (1995–2018) aerosol optical depth derived using ground based AERONET and SKYNET measurements from aerosol aged-background sites 
    Shantikumar, N. S; Larson, E. J. L; Dumka, U. C; Estelles, Victor; Campanelli, M; Steve, Colwell (Elsevier B.V., 2019-03)
    We examined long-term aerosol optical depth (AOD) trends over 53 sites across the globe which comprise 49 sites from the Aerosol Robotic Network (AERONET) and 4 sites from the Sky radiometer Network (SKYNET) during 1995–2018. ...
  • Gaia 20eae: A Newly Discovered Episodically Accreting Young Star 
    Ghosh, Arpan; Sharma, Saurabh; Ninan, Joe P; Ojha, Devendra K; Bhatt, B. C; Kanodia, Shubham; Mahadevan, Suvrath; Stefansson, Gudmundur; Yadav, R. K; Gour, A. S; Pandey, Rakesh; Sinha, Tirthendu; Panwar, Neelam; Wisniewski, John P; Canas, Caleb I; Lin, Andrea S. J; Roy, Arpita; Hearty, Fred; Ramsey, Lawrence; Robertson, Paul; Schwab, Christian (American Astronomical Society, 2022-02-10)
    The Gaia Alert System issued an alert on 2020 August 28, on Gaia 20eae when its light curve showed a ∼4.25 magnitude outburst. We present multiwavelength photometric and spectroscopic follow-up observations of this source ...
  • Probing galaxy evolution through HI 21-cm emission and absorption: current status and prospects with square kilometre array 
    Dutta, Rajeshwari; Kurapati, Sushma; Aditya, J. N. H. S.; Bait, Omkar; Mousumi Das; Dutta, Prasun; Indulekha, K; Nandakumar, Meera; Patra, Narendra Nath; Roy, Nirupam; Roychowdhury, Sambit (Indian Academy of Sciences, 2022-12)
    One of the major science goals of square kilometre array (SKA) is to understand the role played by atomic hydrogen (HI) gas in the evolution of galaxies throughout cosmic time. The hyperfine transition line of the hydrogen ...
  • Study of transient nature of classical Be stars using multi-epoch optical spectroscopy 
    Banerjee, Gourav; Mathew, Blesson; Paul, K. T; Subramaniam, A; Balan, Anjusha; Bhattacharyya, Suman; Anusha, R; Moosa, Deeja; Dheeraj, C. S.; Charly, Aleeda; Raghu, Megha (Indian Academy of Sciences, 2022-12)
    Variability is a commonly observed property of classical Be stars (CBe) stars. In extreme cases, complete disappearance of the Hα emission line occurs, indicating a disc-less state in CBe stars. The disc-loss and reappearing ...
  • The JCMT BISTRO-2 Survey: Magnetic Fields of the Massive DR21 Filament 
    Ching, Tao-Chung; Qiu, Keping; Li, Di; Ren, Zhiyuan; Lai, Shih-Ping; Berry, David; Pattle, Kate; Furuya, Ray; Ward-Thompson, Derek; Johnstone, Doug; Koch, Patrick M.; Liu, Sheng-Yuan; Iwasaki, Kazunari; Jeong, Il-Gyo; Konyves, Vera; Kang, Ji-hyun; Kang, Miju; Karoly, Janik; Kataoka, Akimasa; Kawabata, Koji; Kemper, Francisca; Hasegawa, Tetsuo; Kim, Jongsoo; Lu, Xing; Kim, Mi-Ryang; Kim, Shinyoung; Kim, Hyosung; Kim, Kee-Tae; Kim, Gwanjeong; Kirk, Jason; Kobayashi, Masato I. N.; Kusune, Takayoshi; Shinnaga, Hiroko; Kwon, Jungmi; Lacaille, Kevin; Mairs, Steve; Law, Chi-Yan; Lee, Sang-Sung; Lee, Hyeseung; Lee, Jeong-Eun; Lee, Chin-Fei; Lee, Yong-Hee; Li, Guangxing; Tang, Ya-Wen; Matsumura, Masafumi; Matthews, Brenda; Moriarty-Schieven, Gerald; Nagata, Tetsuya; Nakamura, Fumitaka; Lee, Chang Won; Nakanishi, Hiroyuki; Ngoc, Nguyen Bich; Ohashi, Nagayoshi; Park, Geumsook; Tomisaka, Kohji; Parsons, Harriet; Peretto, Nicolas; Priestley, Felix; Pyo, Tae-Soo; Qian, Lei; Rao, Ramprasad; Hoang, Thiem; Rawlings, Mark; Rawlings, Jonathan; Retter, Brendan; Tram, Le Ngoc; Richer, John; Rigby, Andrew; Sadavoy, Sarah; Saito, Hiro; Savini, Giorgio; Seta, Masumichi; Shimajiri, Yoshito; Tsukamoto, Yusuke; Viti, Serena; Wang, Hongchi; Wu, Jintai; Xie, Jinjin; Cho, Jungyeon; Yang, Meng-Zhe; Kwon, Woojin; Yen, Hsi-Wei; Yoo, Hyunju; Yuan, Jinghua; Yun, Hyeong-Sik; Zenko, Tetsuya; Zhang, Chuan-Peng; Zhang, Yapeng; Zhang, Guoyin; Choi, Yunhee; Zhou, Jianjun; Zhu, Lei; Bastien, Pierre; Looze, Ilse de; Andre, Philippe; Darren Dowell, C.; Eyres, Stewart; Falle, Sam; Robitaille, Jean-Francois; Loo, Sven van; Choi, Youngwoo; Eswaraiah, Chakali; Wang, Jia-Wei; Kim, Kyoung Hee; Hwang, Jihye; Archana Soam; Lyo, A-Ran; Liu, Junhao; Le Gouellec, Valentin J. M.; Arzoumanian, Doris; Whitworth, Anthony; Choi, Minho; Di Francesco, James; Poidevin, Frederick; Liu, Tie; Coude, Simon; Tahani, Mehrnoosh; Liu, Hong-Li; Onaka, Takashi; Li, Dalei; Tamura, Motohide; Chen, Zhiwei; Chrysostomou, Antonio; Tang, Xindi; Kirchschlager, Florian; Bourke, Tyler L.; Byun, Do-Young; Chen, Mike; Chen, Huei-Ru Vivien; Chen, Wen Ping; Chung, Eun Jung; Sophia Dai, Y.; Diep, Pham Ngoc; Doi, Yasuo; Duan, Yan; Li, Hua-bai; Duan, Hao-Yuan; Eden, David; Fanciullo, Lapo; Fiege, Jason; Fissel, Laura M.; Franzmann, Erica; Friberg, Per; Friesen, Rachel; Fuller, Gary; Gledhill, Tim; Lin, Sheng-Jun; Graves, Sarah; Greaves, Jane; Griffin, Matt; Gu, Qilao; Han, Ilseung; Hayashi, Saeko; Houde, Martin; Hull, Charles L. H.; Inoue, Tsuyoshi; Inutsuka, Shu-ichiro (American Astronomical Society, 2022-12-20)
    We present 850 μm dust polarization observations of the massive DR21 filament from the B-fields In STar-forming Region Observations (BISTRO) survey, using the POL-2 polarimeter and the SCUBA-2 camera on the James Clerk ...
  • Theoretical investigations of electronic spectra of silver atom using all-electron scalar relativistic basis 
    Chaudhuri, R. K; Chattopadhyay, Sudip (American Institute of Physics, 2022-12)
    Exploration of the tractable size basis set that can provide reliable estimates of computed properties for systems containing heavy elements has been the subject of interest in quantum chemistry over many decades. In this ...
  • Colonial Astronomy as an element of Empire in British India 
    Kapoor, R. C; Orchiston, Wayne (University of Science and Technology of China, 2023-03)
    In this paper we outline the efforts made by the East India Company, the British colonial authorities, visiting astronomical expeditions and expatriate amateur astronomers to establish astronomical observatories in India ...
  • Editorial: Terrestrial analogues of extraterrestrial environments: Assessing habitability and biosignatures preservation 
    Clarke, Jonathan; Safonova, M; Sivaram, C; Pandey, Siddharth; Blank, Jennifer G. (Frontiers, 2022-11)
  • Tales from India. 1: Meteor showers in classical and colonial sources 
    Kapoor, R. C (University of Science and Technology of China, 2022-09)
    Meteor phenomena are always fascinating and capture popular attention. This paper reports results of a search for references to and records of meteor showers observed in the Indian region, until the close of the nineteenth ...
  • The Solar Ultraviolet Imaging Telescope: detector characterization and readout electronics testing 
    Varma, Manoj; Tyagi, Anurag; Joshi, Bhushan; Yadav, Reena; Chordia, Pravin; Kumar, Ghanshyam; Sinha, Sakya; Burse, Mahesh; Padinhatteri, Sreejith; Deogaonkar, Rushikesh; Ramaprakash, A. N; Ghosh, Avyarthana; Tripathi, Durgesh; Sarkar, Janmejoy; Sankarasubramanian, K; Nagaraju, K; Vadodariya, Koushal; Kesharwani, Ravi; Khan, Aafaque; Olekar, Manjunath; Azaruddin, Mohamed (Oxford University Press on behalf of the Royal Astronomical Society, 2023-01)
    The Solar Ultraviolet Imaging Telescope (SUIT) is one of the payloads onboard the Aditya-L1 mission. It will perform full disc imaging of the Sun in the near-ultraviolet (UV) wavelength range of 200–400 nm. This provides ...
  • Evolution of the thermodynamic properties of a coronal mass ejection in the inner Corona 
    Sheoran, Jyoti; Pant, V; Ritesh Patel; Banerjee, D (Frontiers, 2023-02)
    The thermodynamic evolution of Coronal Mass Ejections (CMEs) in the inner corona (≤1.5 Rsun) is not yet completely understood. In this work, we study the evolution of thermodynamic properties of a CME core observed in the ...
  • Metric-affine effects in crystallization processes of white dwarfs 
    Kalita, Surajit; Sarmah, Lupamudra; Wojnar, Aneta (2023-02-15)
    We analyze the effects of modified gravity on specific heats of electrons and ions, Debye temperature, crystallization process, and cooling mechanism in white dwarfs. We derive the Lane-Emden-Chandrasekhar equation and ...
  • Dust scattered radiation in the galactic poles 
    Murthy, J; Henry, R. C; Overduin, James (Indian Academy of Sciences, 2023-12)
    We have modeled the diffuse background at the Galactic Poles in the far-ultraviolet (FUV: 1536 Å) and the near-ultraviolet (NUV: 2316 Å). The background is well-fit using a single-scattering dustmodel with an offset ...
  • HI line analysis of Herbig Ae/Be stars using X-Shooter spectra 
    Shridharan, B; Mathew, Blesson; Arun, R; Cysil, T. B (Indian Academy of Sciences, 2023-12)
    Herbig Ae/Be stars are intermediate-mass pre-main sequence stars undergoing accretion through their circumstellar disk. The optical and infrared (IR) spectra of HAeBe stars show Hi emission lines belonging to Balmer, ...
  • Quiescence of an outburst of a low-mass young stellar object: LDN1415-IRS 
    Singh, Koshvendra; Ojha, Devendra K.; Ninan, Joe P.; Sharma, Saurabh; Ghosh, Supriyo; Ghosh, Arpan; Bhatt, B. C; Sahu, D. K (Indian Academy of Sciences, 2023-12)
    LDN1415-IRS, a low-mass young stellar object (YSO), went into an outburst between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb. LDN1415-Neb was found to have brightened by I=3.77 mag by April 2006. The ...
  • Solar mean magnetic field of the chromosphere 
    Vishnu, M; Nagaraju, K; Mathur, Harsh (Indian Academy of Sciences, 2023-12)
    The Solar Mean Magnetic Field (SMMF) is the mean value of the line-of-sight (LOS) component of the solar vector magnetic field averaged over the visible hemisphere of the Sun. So far, the studies on SMMF have mostly been ...
  • Indian spectroscopic and imaging space telescope (INSIST): An optics design trade-off study 
    Sriram, S; Valsan, Vineeth; Subramaniam, A; Vishnu, Unni. C; Maheswar, G; Chand, Totan (Indian Academy of Sciences, 2023-12)
    Large ground and space-based surveys in optical and near-infrared (NIR) wavelengths will revolutionize astronomy in the coming decade. Unfortunately, no ultraviolet (UV) facilities are planned to complement these surveys, ...
  • Geometrical structure and stability of buckminsterfullerene complexes containing mono- and poly-atomic molecules 
    Chaudhuri, R. K; Chattopadhyay, Sudip (Indian Academy of Sciences, 2023-09)
    Structure vis-à-vis the stability of mono- and poly-atomic buckminsterfullerene (C60 ) complexes are capable of providing intrigue information about these systems. To obtain an insight of these complexes, geometrical ...
  • The Aditya-L1 mission of ISRO 
    Tripathi, Durgesh; Chakrabarty, D; Nandi, A; Prasad, B. R; Ramaprakash, A. N; Shaji, Nigar; Sankarasubramanian, K; Satheesh Thampi, R; Yadav, V. K (Cambridge University Press on behalf of International Astronomical Union, 2023)
    The Aditya-L1 is the first space-based solar observatory of the Indian Space Research Organization (ISRO). The spacecraft will carry seven payloads providing uninterrupted observations of the Sun from the first Lagrangian ...

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