IIAP Publications: Recent submissions

  • Probing infrared excess connection with Li enhancement among red clump giants 
    Mallick, Anohita; Reddy, B. E; Muthumariappan, C (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We have performed a search among low-mass red giants for finding evidence for merger scenario for triggering He-flash and subsequent Li enhancement. We chose a sample of red giants from GALAH survey with well-measured Li ...
  • Quasi-periodic spicule-like cool jets driven by Alfvén pulses 
    Singh, B; Srivastava, A. K; Sharma, K; Mishra, S. K; Dwivedi, B. N (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We perform a 2.5D magnetohydrodynamic simulation to gain a comprehensive understanding of the formation of spicule-like cool jets caused by initial transverse velocity pulses akin to Alfven´ pulses in the solar chromosphere. ...
  • Formation and Abundance of Late-forming Primordial Black Holes as Dark Matter 
    Chakraborty, Amlan; Chanda, Prolay K; Pandey, Kanhaiya L; Das, Subinoy (American Astronomical Society, 2022-06-20)
    We propose a novel mechanism where primordial black hole (PBH) dark matter is formed much later in the history of the universe, between the epochs of Big Bang nucleosynthesis and cosmic microwave background photon decoupling. ...
  • Circular Polarization Observations of Type II Solar Radio Bursts and the Coronal Magnetic Field 
    Ramesh, R; Kathiravan, C; Ebenezer, E (American Astronomical Society, 2022-06-10)
    It is well known that magnetic field strength (B) in the solar corona can be calculated using the Alfvén Mach number (MA) and Alfvén speed (vA) of the magnetohydrodynamic shock waves associated with coronal type II radio ...
  • In Search of Short Gamma-Ray Burst Optical Counterparts with the Zwicky Transient Facility 
    Ahumada, Tomás; Anand, Shreya; Coughlin, Michael W; Andreoni, Igor; Kool, Erik C; Kumar, Harsh; Reusch, Simeon; Sagués-Carracedo, Ana; Stein, Robert; Cenko, Bradley S; Kasliwal, Mansi M; Singer, Leo P; Dunwoody, Rachel; Mangan, Joseph; Bhalerao, Varun; Bulla, Mattia; Burns, Eric; Graham, Matthew J; Kaplan, David L; Perley, Daniel; Almualla, Mouza; Bloom, Joshua S; Cunningham, Virginia; De, Kishalay; Gatkine, Pradip; Ho, Anna Y. Q; Karambelkar, Viraj; Kong, Albert K. H; Yao, Yuhan; Anupama, G. C; Barway, Sudhanshu; Ghosh, Shaon; Itoh, Ryosuke; McBreen, Sheila; Bellm, Eric C; Fremling, Christoffer; Laher, Russ R; Mahabal, Ashish A; Riddle, Reed L; Rosnet, Philippe; Rusholme, Ben; Smith, Roger; Sollerman, Jesper; Bissaldi, Elisabetta; Fletcher, Corinne; Hamburg, Rachel; Mailyan, Bagrat; Malacaria, Christian; Roberts, Oliver (American Astronomical Society, 2022-06-10)
    The Fermi Gamma-ray Burst Monitor (GBM) triggers on-board in response to ∼40 short gamma-ray bursts (SGRBs) per year; however, their large localization regions have made the search for optical counterparts a challenging ...
  • NuSTAR spectral analysis of three Seyfert galaxies: NGC 3227, NGC 5548, and MR 2251−178 
    Pal, Indrani; Stalin, C. S; Mallick, L; Priyanka Rani (EDP Sciences, 2022-06)
    Context. The observed nuclear X-ray emission in the radio-quiet category of active galactic nuclei (AGN) is believed to be from a compact region, the corona, which is situated in the vicinity of central supermassive black ...
  • Variable mass accretion and failed wind explain changing-look phenomena in NGC 1365 
    Mondal, Santanu; Adhikari, T. P; Hryniewicz, K; Stalin, C. S; Pandey, Ashwani (EDP Sciences, 2022-06)
    Changing-look active galactic nuclei (CLAGNs) show a complex nature in their X-ray spectral shape and line-of-sight column-density variation. The physical mechanisms responsible for these variations are unclear. Here, we ...
  • The Solar Activity Monitor Network – SAMNet 
    Erdelyi, Robertus; Korsos, Marianna B; Huang, Xin; Yang, Yong; Pizzey, Danielle; Wrathmall, Steven A; Hughes, Ifan G; Dyer, Martin J; Dhillon, Vikram S; Belucz, Bernadett; Brajsa, Roman; Chatterjee, Piyali; Cheng, Xuewu; Deng, Yuanyong; Dominguez, Santiago Vargas; Joya, Raul; Gömöry, Peter; Gyenge, Norbert G; Hanslmeier, Arnold; Kucera, Ales; Kuridze, David; Li, Faquan; Liu, Zhong; Xu, Long; Mathioudakis, Mihalis; Matthews, Sarah; McAteer, James R.T; Pevtsov, Alexei A; Pötzi, Werner; Romano, Paolo; Shen, Jinhua; Temesvary, Janos; Tlatov, Andrey G; Triana, Charles; Utz, Dominik; Veronig, Astrid M; Wang, Yuming; Yan, Yihua; Zaqarashvili, Teimuraz; Zuccarello, Francesca (EDP Sciences, 2022-06)
    The Solar Activity Magnetic Monitor (SAMM) Network (SAMNet) is a future UK-led international network of ground-based solar telescope stations. SAMNet, at its full capacity, will continuously monitor the Sun’s intensity, ...
  • A 10-m class national large optical-IR telescope 
    Anupama, G. C; Maheswar, G; Sriram, S; Sivarani, T; Parihar, P. S; Nagabhushana, S; Angchuk, D; Barway, Sudhanshu; Bhatt, B. C; Banyal, R. K; Basheer, Alikhan; Prasanna, Deshmukh; Divakar, D. K; Dorjai, T; Goswami, A; Govinda, K. V; Jorphail, S; Kamath, U. S; Kemkar, P. M. M; Mahay, T. T; Muneer, S; Muthumariappan, C; Shantikumar, N. S; Pandey, G; Reddy, B. E; Sahu, D. K; Sandeep, D. S; Ramya, S; Stalin, C. S; Subramanian, S; Tsewang, Stanzin; Subramaniam, A (Indian Academy of Science, 2022-06)
    An observatory class national large optical-IR telescope (NLOT), is proposed to be built and located in the country. The telescope consists of a 10–12 m segmented primary. In order to cater to a diversity of observational ...
  • The twin radio galaxy TRG J104454+354055 
    Gopal-Krishna; Joshi, Ravi; Patra, Dusmanta; Yang, Xiaolong; Ho, Luis C; Wiita, Paul J; Omar, Amitesh (Oxford University Press on behalf of Royal Astronomical Society, 2022-07)
    We report observations of a bright dumb-bell system of galaxies (z = 0.162) with the upgraded Giant Metrewave Radio Telescope (uGMRT), which show that each member of this gravitationally bound pair of galaxies hosts bipolar ...
  • The Magnetic Field in the Milky Way Filamentary Bone G47 
    Stephens, Ian W; Myers, Philip C; Zucker, Catherine; Jackson, James M; Andersson, B.-G; Smith, Rowan; Archana Soam; Battersby, Cara; Sanhueza, Patricio; Hogge, Taylor; Smith, Howard A; Novak, Giles; Sadavoy, Sarah; Pillai, Thushara G.S; Li, Zhi-Yun; Looney, Leslie W; Sugitani, Koji; Coude, Simon; Guzman, Andres; Goodman, Alyssa; Kusune, Takayoshi; Santos, Fabio P; Zuckerman, Leah; Encalada, Frankie (IOP Publishing, 2022-02-10)
    Star formation primarily occurs in filaments where magnetic fields are expected to be dynamically important. The largest and densest filaments trace the spiral structure within galaxies. Over a dozen of these dense (∼104 ...
  • The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst 
    Kumar, Harsh; Gupta, Rahul; Saraogi, Divita; Ahumada, Tomás; Andreoni, Igor; Anupama, G. C; Aryan, Amar; Barway, Sudhanshu; Bhalerao, Varun; Chandra, Poonam; Coughlin, Michael W; Dimple; Dutta, Anirban; Ghosh, Ankur; Ho, Anna Y. Q; Kool, E. C; Kumar, Amit; Medford, Michael S; Misra, Kuntal; Pandey, Shashi B; Perley, Daniel A; Riddle, Reed; Ror, Amit Kumar; Setiadi, Jason M; Yao, Yuhan (Oxford University Press on behalf of Royal Astronomical Society, 2022-06)
    We present results from extensive broadband follow-up of GRB 210204A over the period of 30 d. We detect optical flares in the afterglow at 7.6 × 105 s and 1.1 × 106 s after the burst: the most delayed flaring ever detected ...
  • The Indo-Russian UV Spectrograph Project for the Chinese Space Station (SING) 
    Sachkova, M. E; Bharat Chandra; Shanti Prabha, C; Prakash, Ajin; Binukumar, G; Safonova, M; Rai, Richa; Mohan, Rekhesh; Murthy, J; Shmagin, V. E (Springer Nature, 2021-12)
    The ultraviolet wavelength range (90–300 nm) is one of the most important parts of the electromagnetic spectrum for astrophysicists. The success of the GALEX and ASTROSAT/UVIT missions has given a new view on the ultraviolet ...
  • Spectral Lines in FUV and EUV for Diagnosing Coronal Magnetic Field 
    Raveena, Khan; Nagaraju, K (Springer Nature, 2022-07)
    The diagnostic capabilities of spectral lines in the far-ultraviolet (FUV) and extremeultraviolet (EUV) wavelength ranges are explored in terms of their Hanle and Zeeman sensitivity to probe the vector magnetic fields in ...
  • Searching for a Solar Source of Magnetic-Field Switchbacks in Parker Solar Probe’s First Encounter 
    Pablos, D. de; Samanta, T; Badman, S. T; Schwanitz, C; Harra, L. K; Petrie, G; Mac Cormack, C; Mandrini, C. H; Raouafi, N. E; Martinez Pillet, V; Velli, M (Springer Nature, 2022-07)
    Parker Solar Probe observations show ubiquitous magnetic-field reversals closer to the Sun, often referred to as “switchbacks”. The switchbacks have been observed before in the solar wind near 1 AU and beyond, but their ...
  • Physical conditions and chemical abundances of the variable planetary nebula IC 4997 
    Danehkar, A; Parthasarathy, M (Oxford University Press on behalf of the Royal Astronomical Society, 2022-07)
    The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and ...
  • Particle production during inflation: a Bayesian analysis with CMB data from Planck 2018 
    Naik, Suvedha Suresh; Furuuchi, Kazuyuki; Pravabati, C (IOP Publishing, 2022-07)
    A class of inflationary models that involve rapid bursts of particle productions predict observational signatures, such as bump-like features in the primordial scalar power spectrum. In this work, we analyze such models ...
  • Probing TYC 3315-1807-1, An sdB+dM Binary Displaying Strong Period Variation and Reflection Effect 
    Devarapalli, Shanti Priya; Jagirdar, Rukmini; Gundeboina, Vinay Kumar; Thomas, Vineet S; Srinivasa Rao, M (2022-07)
    Subdwarf (sdB) stars include core helium-burning stars with a very thin hydrogen envelope that lies at the blue end of the horizontal branch (or extreme horizontal branch). Among them, short-period sdB binaries especially ...
  • Association between the number of flares in an active region and cumulative flux 
    Suryanarayana, G. S (Elsevier, 2022-07-01)
    Active region (AR) flux is released in the form of flares and Coronal Mass Ejections and a host of several other energetic events. The development of an AR is an indication of the accumulation of flux which reflects the ...
  • Characterizing the Optical Nature of the Blazar S5 1803+784 during Its 2020 Flare 
    Agarwal, A; Pandey, Ashwani; Ozdonmez, Aykut; Ege, Ergun; Avik, Kumar Das; Volkan, Karakulak (IOP Publishing, 2022-07-01)
    We report the results from our study of the blazar S5 1803+784 carried out using quasi-simultaneous B, V, R, and I observations from 2020 May to 2021 July on 122 nights. Our observing campaign detected a historically bright ...

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