IIA Institutional Repository: Recent submissions

  • Thermal and temporal stability of W / B4C multilayer mirrors for space-based astronomical applications 
    Panini, S. S; Nayak, M; Gupta, Rajkumar; Pradhan, Paresh C.; Majhi, Arindam; Narendranath, S; Sreekumar, P (SPIE-Society of Photo-Optical Instrumentation Engineers, 2018-10)
    W  /  B4C multilayer (ML) mirrors with varying periodicities   (  d  )    =  1.6 to 5.4 nm are tested for rapid thermal and temporal stability, which are required for space-based x-ray telescopes for astronomy. The aging ...
  • Variable stars in NGC 4147 revisited: RR Lyrae stars new CCD VI photometry and physical parameters 
    Arellano Ferro, A; Rojas Galindo, F. C; Muneer, S; Giridhar, S (Universidad Nacional Autonoma De Mexico, 2018-10)
    We have calculated the physical parameters of the RR Lyrae stars in the globular cluster NGC 4147 via the Fourier decomposition of their light curves, using new data and well-established semi-empirical calibrations and ...
  • Taming the excited states of butadiene, hexatriene, and octatetraene using state specific multireference perturbation theory with density functional theory orbitals 
    Manna, S; Chaudhuri, R. K; Chattopadhyay, S (American Institute of Physics, 2020-06-28)
    To compute the electronic excitation energies, a state-specific multireference Møller–Plesset perturbation theory (SSMRPT) with a complete active space configuration interaction reference function constructed using the ...
  • An Image Auto Guider System for Kodaikanal Tower Tunnel Telescope 
    Mathur, Harsh; Thulasidharen, K. C; Hemanth, P; Nagaraju, K; Rajalingam, M (World Scientific Publishing, 2023-02)
    The Kodaikanal Tower Tunnel Telescope (KTT) is a three-mirror Coelostat-based Solar telescope. An inherent variable image drift is present in the KTT which is detrimental to observations particularly to slit-based spectroscopic ...
  • Water vapour characteristics and radiative effects at high-altitude Himalayan sites 
    Dumka, U. C; Kaskaoutis, D. G; Khatri, Pradeep; Shantikumar, N. S; Sheoran, Rahul; Jade, Sridevi; Shrungeshwara, T. S; Rupakheti, Maheswar (Elsevier B.V., 2022-02)
    We analyze long-term aerosol and precipitable water vapour (PWV) properties at two high-altitude sites (Nainital and Hanle) over the central Himalayan and western Trans-Himalayan region from 2008 to 2018. First-time ...
  • Dependence of the effective mass attenuation coefficient of gold nanoparticles on its radius 
    Haghighi, Rezvan Ravanfar; Chatterjee, S; Chatterjee, Vani Vardhan; Hosseinipanah, Sedigheh; Tadrisinik, Fariba (Elsevier B.V., 2022-03)
    Purpose: Several investigations are being carried since the past decade to use gold nanoparticles’ (AuNP) suspensions as contrast agents (CA) for imaging in Computed Tomography. For this, the optimal size of AuNP has ...
  • Long-Term Monitoring of Blazar PKS 0208-512: A Change of γ-Ray Baseline Activity from EGRET to Fermi Era 
    Ammenadka, Krishna Mohana; Bhattacharya, Debbijoy; Bhattacharyya, Subir; Bhatt, N; Stalin, C. S (Multidisciplinary Digital Publishing Institute, 2022-10)
    The blazar PKS 0208-512 was in the lowest 𝛾 -ray brightness state during the initial 10 years of observations with the Fermi Gamma-ray Space Telescope (Fermi), which was an order of magnitude lower than its flux state ...
  • Cooling Process of White Dwarf Stars in Palatini f(R) Gravity 
    Kalita, Surajit; Sarmah, Lupamudra; Wojnar, Aneta (Multidisciplinary Digital Publishing Institute, 2022-12)
    A simple cooling model of white dwarf stars is re-analyzed in Palatini 𝑓(𝑅) gravity. Modified gravity affects the white dwarf structures and consequently their ages. We find that the resulting super-Chandrasekhar white ...
  • 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 ...

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