IIA Institutional Repository: Recent submissions

  • AOTF-based spectro-polarimeter for observing Earth as an exoplanet 
    Jaiswal, Bhavesh; Singh, Swapnil; Jain, Anand; Sankarasubramanian, K; Nandi, Anuj (SPIE-Society of Photo-Optical Instrumentation Engineers, 2022-10)
    Earth is the only known habitable planet and it serves as a testbed to benchmark the observations of temperate and more Earth-like exoplanets. It is required to observe the diskintegrated signatures of Earth for a large ...
  • Optical metrology on primary mirror of visible emission line coronagraph on board Aditya-L1 mission 
    Venkata Suresh, Narra; Singh, Darshika; Venkatasubramanian, N; Budhiraju, Vishweshwar Rao; Hegde, Bhavana; Bhat, Nishchith; Utkarsha, D; Somasundaram, P. K; Ramaswamy, Venkateswaran; Kamath, P. U; Sriram, Kuppuswamy Venkatesan; Prasad, B. R (SPIE-Society of Photo-Optical Instrumentation Engineers, 2022-10)
    The visible emission line coronagraph (VELC) on board the Aditya-L1 mission is an internally occulted reflective coronagraph. It is capable of simultaneous observations of the solar corona in imaging, spectroscopic, and ...
  • Eccentric equatorial trajectories around a Kerr black hole asa QPO model for M82X-1 
    Prerna Rana; Mangalam, A (World Scientific Publishing, 2022)
    We study the bound orbit conditions for equatorial and eccentric orbits around a Kerrblack hole both in the parameter space (E,L,a) representing the energy, angular mo-mentum of the test particle, and spin of the black ...
  • Gaia EDR3 Data of Post-AGB Stars with Overabundance of s-process Elements: Evolutionary Status and Binarity 
    Parthasarathy, M (American Astronomical Society, 2022-02)
    Kamath et al. analyzed Gaia EDR3 data of 18 post-asymptotic giant branch (AGB) supergiants having overabundance of s-process elements, some of which exhibit unusually low luminosities in disagreement with expectations of ...
  • Bound orbit domains in the phase space of the Kerr geometry 
    Prerna Rana; Mangalam, A (World Scientific Publishing, 2022)
    We derive the conditions for a non-equatorial eccentric bound orbit to exist around a Kerrblack hole in two-parameter spaces: the energy, angular momentum of the test particle,spin of the black hole, and Carter’s constant ...
  • MONG: An extension to galaxy clusters 
    Rebecca, Louise; Kenath, Arun; Sivaram, C (World Scientific Publishing, 2022-04-30)
    The presence of dark matter (DM), though well established by indirect evidence, is yet to be observed directly. Various DM detection experiments running for several years have yielded no positive results. In view of these ...
  • Low-cost Raspberry Pi star sensor for small satellites 
    Bharat Chandra, P; Sarpotdar, Mayuresh; Binukumar, G; Rai, Richa; Mohan, Rekhesh; Mathew, Joice; Safonova, M; Murthy, J (SPIE-Society of Photo-Optical Instrumentation Engineers, 2022-07)
    We present a low-cost Raspberry Pi-based star sensor StarberrySense using commercial-off-the-shelf components, developed and built for applications in small satellites and CubeSat-based missions. A star sensor is one of ...
  • The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2 
    Hwang, Jihye; Kim, Jongsoo; Pattle, Kate; Lee, Chang Won; Koch, Patrick M; Johnstone, Doug; Tomisaka, Kohji; Whitworth, Anthony; Furuya, Ray S; Kang, Ji-hyun; Lyo, A-Ran; Duan, Yan; Gu, Qilao; Law, Chi-Yan; Kobayashi, Masato I. N; Li, Dalei; Li, Di; Li, Guangxing; Li, Hua-bai; Liu, Tie; Lu, Xing; Chrysostomou, Antonio; Qian, Lei; Wang, Hongchi; Wu, Jintai; Xie, Jinjin; Nagata, Tetsuya; Yuan, Jinghua; Zhang, Chuan-Peng; Zhang, Guoyin; Zhang, Yapeng; Zhou, Jianjun; Debattista, Victor; Zhu, Lei; Berry, David; Friberg, Per; Graves, Sarah; Liu, Junhao; Nakamura, Fumitaka; Mairs, Steve; Parsons, Harriet; Rawlings, Mark; Doi, Yasuo; Eden, David; Hayashi, Saeko; Hull, Charles L. H; Inoue, Tsuyoshi; Inutsuka, Shu-ichiro; Iwasaki, Kazunari; Kataoka, Akimasa; Nakanishi, Hiroyuki; Pyo, Tae-Soo; Saito, Hiro; Seta, Masumichi; Park, Geumsook; Shimajiri, Yoshito; Chung, Eun Jung; Shinnaga, Hiroko; Tsukamoto, Yusuke; Zenko, Tetsuya; Chen, Huei-Ru Vivien; Duan, Hao-Yuan; Fanciullo, Lapo; Kemper, Francisca; Lee, Chin-Fei; Eyres, Stewart; Lin, Sheng-Jun; Liu, Sheng-Yuan; Arzoumanian, Doris; Ohashi, Nagayoshi; Rao, Ramprasad; Tang, Ya-Wen; Wang, Jia-Wei; Yang, Meng-Zhe; Yen, Hsi-Wei; Bourke, Tyler L; Falle, Sam; Fuller, Gary; Gledhill, Tim; Greaves, Jane; Griffin, Matt; Choi, Minho; Hatchell, Jennifer; Karoly, Janik; Kirk, Jason; Konyves, Vera; Kwon, Woojin; Longmore, Steven; van Loo, Sven; de Looze, Ilse; Peretto, Nicolas; Priestley, Felix; Choi, Youngwoo; Rawlings, Jonathan; Retter, Brendan; Richer, John; Rigby, Andrew; Savini, Giorgio; Kim, Shinyoung; Scaife, Anna; Viti, Serena; Diep, Pham Ngoc; Ngoc, Nguyen Bich; Choi, Yunhee; Tram, Le Ngoc; Andre, Philippe; Coude, Simon; Dowell, C. Darren; Friesen, Rachel; Robitaille, Jean-Francois; Tamura, Motohide; Kwon, Jungmi; Archana, Soam; Han, Ilseung; Jeong, Il-Gyo; Hoang, Thiem; Kim, Kyoung Hee; Onaka, Takashi; Eswaraiah, Chakali; Ward-Thompson, Derek; Liu, Hong-Li; Tang, Xindi; Chen, Wen Ping; Matsumura, Masafumi; Hoang, Thuong Duc; Kang, Miju; Chen, Zhiwei; Le Gouellec, Valentin J. M; Kirchschlager, Florian; Poidevin, Frederick; Bastien, Pierre; Qiu, Keping; Hasegawa, Tetsuo; Lai, Shih-Ping; Byun, Do-Young; Cho, Jungyeon; Kim, Hyosung; Kim, Kee-Tae; Lee, Jeong-Eun; Lee, Sang-Sung; Lee, Yong-Hee; Kawabata, Koji; Lee, Hyeseung; Kim, Mi-Ryang; Yoo, Hyunju; Yun, Hyeong-Sik; Chen, Mike; Di Francesco, James; Fiege, Jason; Fissel, Laura M; Franzmann, Erica; Houde, Martin; Kim, Gwanjeong; Lacaille, Kevin; Matthews, Brenda; Sadavoy, Sarah; Moriarty-Schieven, Gerald; Tahani, Mehrnoosh; Ching, Tao-Chung; Dai, Y. Sophia (American Astronomical Society, 2022-12-10)
    We present and analyze observations of polarized dust emission at 850 μm toward the central 1 × 1 pc hubfilament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell ...
  • Optical studies of a bright Type Iax supernova SN 2020rea 
    Singh, Mridweeka; Misra, Kuntal; Sahu, D. K; Ailawadhi, Bhavya; Dutta, Anirban; Howell, D. Andrew; Anupama, G. C; Bostroem, K. Azalee; Burke, Jamison; Dastidar, Raya; Gangopadhyay, Anjasha; Hiramatsu, Daichi; Im, Hyobin; McCully, Curtis; Pellegrino, Craig; Srivastav, Shubham; Teja, Rishabh Singh (Oxford University Press on behalf of Royal Astronomical Society, 2022-12)
    We present optical photometric and spectroscopic analysis of a Type Iax supernova (SN) 2020rea situated at the brighter luminosity end of Type Iax supernovae (SNe). The light curve decline rate of SN 2020rea is m15(g) = ...
  • Emission line star catalogues post-Gaia DR3: A validation of Gaia DR3 data using the LAMOST OBA emission catalogue 
    Shridharan, B; Mathew, B; Bhattacharyya, S; Robin, T; Arun, R; Kartha, S. S; Manoj, P; Nidhi, S; Maheswar, G; Paul, K. T; Narang, M; Himanshu, T (EDP Sciences, 2022-12)
    Aims. Gaia Data Release 3 (DR3) and further releases have the potential to identify and categorise new emission-line stars in the Galaxy. We perform a comprehensive validation of astrophysical parameters from Gaia DR3 ...
  • A very luminous jet from the disruption of a star by a massive black hole 
    Andreoni, Igor; Coughlin, Michael W; Perley, Daniel A; Yao, Yuhan; Lu, Wenbin; Bradley Cenko, S; Kumar, Harsh; Anand, Shreya; Ho, Anna Y. Q; Kasliwal, Mansi M; de Ugarte Postigo, Antonio; Sagues-Carracedo, Ana; Schulze, Steve; Alexander Kann, D; Kulkarni, S. R; Sollerman, Jesper; Tanvir, Nial; Rest, Armin; Izzo, Luca; Somalwar, Jean J; Kaplan, David L; Ahumada, Tomas; Anupama, G. C; Auchettl, Katie; Barway, Sudhanshu; Bellm, Eric C; Bhalerao, Varun; Bloom, Joshua S; Bremer, Michael; Bulla, Mattia; Burns, Eric; Campana, Sergio; Chandra, Poonam; Charalampopoulos, Panos; Cooke, Jeff; D’Elia, Valerio; Das, Kaustav Kashyap; Dobie, Dougal; Fernandez, Jose Feliciano Agui; Freeburn, James; Fremling, Cristoffer; Gezari, Suvi; Goode, Simon; Graham, Matthew J; Hammerstein, Erica; Karambelkar, Viraj R; Kilpatrick, Charles D; Kool, Erik C; Krips, Melanie; Laher, Russ R; Leloudas, Giorgos; Levan, Andrew; Lundquist, Michael J; Mahabal, Ashish A; Medford, Michael S; Coleman Miller, M; Moller, Anais; Mooley, Kunal P; Nayana, A. J; Nir, Guy; Pang, Peter T. H; Paraskeva, Emmy; Perley, Richard A; Petitpas, Glen; Pursiainen, Miika; Ravi, Vikram; Ridden-Harper, Ryan; Riddle, Reed; Rigault, Mickael; Rodriguez, Antonio C; Rusholme, Ben; Sharma, Yashvi; Smith, I. A; Stein, Robert D; Thone, Christina; Tohuvavohu, Aaron; Valdes, Frank; van Roestel, Jan; Vergani, Susanna D; Wang, Qinan; Zhang, Jielai (Springer Nature, 2022-12-15)
    Tidal disruption events (TDEs) are bursts of electromagnetic energy that are released when supermassive black holes at the centres of galaxies violently disrupt a star that passes too close1. TDEs provide a window through ...
  • India-TMT project—science instrumentation program 
    Sivarani, T; Ramya, S; Sriram, S; Divakar, Devika; Surya, Arun; Varshney, Hari Mohan; Kambala, Sudarshan; Hasan, Amirul; Prakash, A; Govinda, K. V; Viswanatha; Anupama, G. C; Maheswar, G; Ojha, D; Pandey, S. B; Pandey, J; Puravankara, M; Ramaprakash, A. N; Reddy, B. E; Shah, Sarang; Srianand, R; Subramaniam, A; Subramanian, S (Indian Academy of Sciences, 2022-12)
    The future of astronomy in the coming decades will be shaped by the upcoming three extremely large optical telescopes, the Thirty Meter Telescope (TMT), the Giant Magellan Telescope (GMT) and the European Large Telescope ...
  • Fundamental parameters of barium and CH stars from asteroseismic analysis: HD 33409, HD 20084 and HD 66812 
    Sonamben, Mayani; Goswami, A (Indian Academy of Sciences, 2022-12)
    Asteroseismic analysis of stars using space mission data, such as the transiting exoplanet survey satellite (TESS) allows us to derive accurate fundamental parameters of stars. Barium and CH stars are believed to be in ...
  • An overview of the proposed Indian spectroscopic and imaging space telescope 
    Subramaniam, A (Indian Academy of Sciences, 2022-12)
    India reached a major milestone in the area of space astronomy with the successful launch and postlaunch operations of its first space observatory, AstroSat. The success of this space observatory and the lessons learned ...
  • Different representations of a partially ionized plasma 
    Krishan, V (Indian Academy of Sciences, 2022-12)
    It is economical to devise ways and means to simplify a multi-species particle system. A partially ionized plasma consisting of electrons, ions and neutral particles can be described as a three-fluid, a two-fluid or a ...
  • Properties of shock waves in the quiet-Sun chromosphere 
    Mathur, Harsh; Joshi, Jayant; Nagaraju, K; van der Voort, Luc Rouppe; Bose, Souvik (EDP Sciences, 2022-12)
    Context. Short-lived (100 s or less), sub-arcsec to a couple of arcsec sized features of enhanced brightenings in the narrowband images at the H2V and K2V positions of the Ca ii H&K lines in the quiet Sun are known as ...
  • Study of accretion flows around an ultraluminous X-ray source M82 X-1 using NuSTAR data 
    Mondal, Santanu; Palit, Biswaraj; Chakrabarti, Sandip K (Indian Academy of Sciences, 2022-12)
    We study the spectral properties and accretion flow behavior of an ultraluminous X-ray source M82 X-1 using NuSTAR observations. We use the physical two-component advective flow (TCAF) model to fit the data and to derive ...
  • Detection of minute-timescale γ-ray variability in BL Lacertae by Fermi-LAT 
    Pandey, Ashwani; Stalin, C. S (EDP Sciences, 2022-12)
    BL Lacertae, the prototype of the BL Lacertae (BL Lac) category of blazars, underwent a giant γ-ray flare in April 2021. The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (hereafter Fermi-LAT) ...
  • Intra-night optical variability monitoring of c-ray emitting blazars 
    Pandian, K Subbu Ulaganatha; Natarajan, A; Stalin, C. S; Pandey, Ashwani; Muneer, S; Natarajan, B (Indian Academy of Sciences, 2022-12)
    We present the results obtained from our campaign to characterize the intra-night optical variability properties of blazars detected by the Fermi large area telescope. This involves R-band monitoring observations of a ...
  • The Role of Filamentary Structures in the Formation of Two Dense Cores, L1544 and L694-2 
    Kim, Shinyoung; Lee, Chang Won; Tafalla, Mario; Maheswar, G; Caselli, Paola; Myers, Philip C; Chung, Eun Jung; Li, Shanghuo (American Astronomical Society, 2022-12-01)
    We present mapping results of two prestellar cores, L1544 and L694-2, embedded in filamentary clouds in C18O (3–2), 13CO (3–2), 12CO (3–2), HCO+ (4–3), and H13CO+ (4–3) lines with the James Clerk Maxwell Telescope to examine ...

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