IIA Institutional Repository: Recent submissions

  • Effect of low-mass galaxy interactions on their star formation 
    Subramanian, S; Mondal, Chayan; Kalari, Venu (EDP Sciences, 2024-01)
    According to the Λ cold dark matter model of galaxy formation, the hierarchical assembly process is scale-free and interactions between galaxies in all mass ranges are expected. The effects of interactions between dwarf ...
  • Polarized resonance line transfer in a spherically symmetric medium with angle-dependent partial frequency redistribution 
    Sampoorna, M; Supriya, H. D (Oxford University Press on behalf of Royal Astronomical Society, 2023-12)
    In a stellar atmosphere, the resonance line polarization arises from scattering of limb-darkened radiation field by atoms. This spectral line polarization gets affected particularly in the wings, when the line photons ...
  • Evolution of low-frequency quasi-periodic oscillations in GX 339-4 during its 2021 outburst using AstroSat data 
    Mondal, Santanu; Salgundi, Anirudh; Chatterjee, Debjit; Jana, Arghajit; Chang, H. K; Naik, Sachindra (Oxford University Press on behalf of Royal Astronomical Society, 2023-12)
    The black hole X-ray binary GX 339-4 showed an X-ray outburst during 2021. The AstroSat captured this outburst when the source entered into the intermediate flux state while the count rate was declining. The source showed ...
  • X-ray polarization observations of IC 4329A with IXPE: Constraining the geometry of the X-ray corona 
    Pal, Indrani; Stalin, C. S; Chatterjee, Rwitika; Agrawal, Vivek K (Indian Academy of Sciences, 2023-12)
    X-ray polarimetry is a powerful tool to probe the geometry of the hot X-ray corona in active galactic nuclei (AGN). Here, we present our results on the characterisation of the X-ray polarization of the radio-quiet Seyfert-type ...
  • Identifying the population of T-Tauri stars in Taurus: UV–optical synergy 
    Nayak, Prasanta K; Narang, Mayank; Puravankara, Manoj; Tyagi, Himanshu; Banerjee, Bihan; Sharma, Saurabh; Pandey, Rakesh; Surya, Arun; Mathew, Blesson; Arun, R; Ujjwal, K; Kartha, Sreeja S (Indian Academy of Sciences, 2023-12)
    With the third data release of the Gaia mission, GaiaDR3with its precise photometry and astrometry, it is now possible to study the behavior of stars at a scale never seen before. In this paper, we developed new criteria ...
  • Correlation between Supergranular Lane Widths and Sunspot Number; A Simple Way to Predict the Amplitude of Sunspot Cycle 
    Raju, K. P; Singh, Jagdev; Ravindra, B; Priyal, M (American Astronomical Society, 2023-12-20)
    The network structure seen in the solar images is the outline of supergranulation, which is the large-scale convection in the Sun with a size of about 30 Mm and a lifetime of 24 hr. We have obtained the supergranulation lane ...
  • Evidence for Low-power Radio Jet–ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Riffel, Rogemar A; Manna, Arijit; Pal, Sabyasachi; Dors, O. L; Wylezalek, Dominika; Paliya, Vaidehi S; Saikia, Payaswini; Dabhade, Pratik; Patig, Markus-Kissler; Sagar, R (American Astronomical Society, 2023-12-20)
    Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in ...
  • Solar Radio Spectro-polarimeter (50–500 MHz). I. Design, Development, and Characterization of a Cross-polarized, Log-periodic Dipole Antenna 
    Kumari, Anshu; Gireesh, G. V. S; Kathiravan, C; Mugundhan, V; Barve, Indrajit V; Ramesh, R; Monstein, C (American Astronomical Society, 2023-12-01)
    The Zeeman effect has been routinely used to image and quantify the solar photospheric magnetic field (B). Such a direct measuring technique is not yet available for the corona (Lin et al. 2004). Since almost all ...
  • Bisymmetric pupil modification deconvolution strategy for differential optical transfer function (dOTF) wavefront sensing 
    Martinez, P; Radhika, D (EDP Sciences, 2023-12)
    Context. The differential optical transfer function (dOTF) is a model-independent image-based wavefront sensor for measuring the complex pupil field (phase and amplitude). This method is particularly suitable for compensating ...
  • Protoplanetary disks in Ks-band total intensity and polarized light 
    Ren, Bin B; Benisty, Myriam; Ginski, Christian; Tazaki, Ryo; Wallack, Nicole L; Milli, Julien; Garuf, Antonio; Bae, Jaehan; Facchini, Stefano; Menard, Francois; Pinilla, Paola; Swastik, C; Teague, Richard; Wahhaj, Zahed (EDP Sciences, 2023-12)
    Context. The diverse morphology among protoplanetary disks may result from planet-disk interactions, suggesting the presence of planets undergoing formation. The characterization of disks can provide information on the ...
  • TCP J18224935-2408280: a symbiotic star identified during outburst 
    Sonith, L. S; Kamath, U. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-12)
    TCP J18224935-2408280 was reported to be in outburst on 2021 May 19. Follow-up spectroscopic observations confirmed that the system was a symbiotic star. We present optical spectra obtained from the Himalayan Chandra ...
  • Minutes-duration optical flares with supernova luminosities 
    Ho, Anna Y. Q; Perley, Daniel A; Chen, Ping; Schulze, Steve; Dhillon, Vik; Kumar, Harsh; Suresh, Aswin; Swain, Vishwajeet; Bremer, Michael; Smartt, Stephen J; Anderson, Joseph P; Anupama, G. C; Awiphan, Supachai; Barway, Sudhanshu; Bellm, Eric C; Ben-Ami, Sagi; Bhalerao, Varun; de Boer, Thomas; Brink, Thomas G; Burruss, Rick; Chandra, Poonam; Chen, Ting-Wan; Chen, Wen-Ping; Cooke, Jeff; Coughlin, Michael W; Das, Kaustav K; Drake, Andrew J; Filippenko, Alexei V; Freeburn, James; Fremling, Christoffer; Fulton, Michael D; Gal-Yam, Avishay; Galbany, Lluís; Gao, Hua; Graham, Matthew J; Gromadzki, Mariusz; Gutierrez, Claudia P; Hinds, K. -Ryan; Inserra, Cosimo; Nayana, A. J; Karambelkar, Viraj; Kasliwal, Mansi M; Kulkarni, Shri; Muller-Bravo, Tomas E; Magnier, Eugene A; Mahabal, Ashish A; Moore, Thomas; Ngeow, Chow-Choong; Nicholl, Matt; Ofek, Eran O; Omand, Conor M. B; Onori, Francesca; Pan, Yen-Chen; Pessi, Priscila J; Petitpas, Glen; Polishook, David; Poshyachinda, Saran; Pursiainen, Miika; Riddle, Reed; Rodriguez, Antonio C; Rusholme, Ben; Segre, Enrico; Sharma, Yashvi; Smith, Ken W; Sollerman, Jesper; Srivastav, Shubham; Strotjohann, Nora Linn; Suhrx, Mark; Svinkin, Dmitry; Wang, Yanan; Wiseman, Philip; Wold, Avery; Yang, Sheng; Yang, Yi; Yao, Yuhan; Young, David R; Zheng, WeiKang (Springer Nature, 2023-11-30)
    In recent years, certain luminous extragalactic optical transients have been observed to last only a few days1. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic ...
  • COSMOGLOBE DR1 results. II. Constraints on isotropic cosmic birefringence from reprocessed WMAP and Planck LFI data 
    Eskilt, J. R; Watts, D. J; Aurlien, R; Basyrov, A; Bersanelli, M; Brilenkov, M; Colombo, L. P. L; Eriksen, H. K; Fornazier, K. S. F; Franceschet, C; Fuskeland, U; Galloway, M; Gjerlow, E; Hensley, B; Hergt, L. T; Herman, D; Ihle, H. T; Lee, K; Lunde, J. G. S; Nerval, S. K; Paradiso, S; Patel, S. K; Fazlu, Rahman; Regnier, M; San, M; Sanyal, S; Stutzer, N. O.; Thommesen, H; Verma, A; Wehus, I. K; Zhou, Y (EDP Sciences, 2023-11)
    Cosmic birefringence is a parity-violating effect that might have rotated the plane of the linearly polarized light of the cosmic microwave background (CMB) by an angle β since its emission. This angle has recently been ...
  • COSMOGLOBE DR1 results. I. Improved Wilkinson Microwave Anisotropy Probe maps through Bayesian end-to-end analysis 
    Watts, D. J; Basyrov, A; Eskilt, J. R; Galloway, M; Gjerlow, E; Hergt, L. T; Herman, D; Ihle, H. T; Paradiso, S; Fazlu, Rahman; Thommesen, H; Aurlien, R; Bersanelli, M; Bianchi, L. A; Brilenkov, M; Colombo, L. P. L; Eriksen, H. K; Franceschet, C; Fuskeland, U; Hensley, B; Hoerning, G. A; Lee, K; Lunde, J. G. S; Marins, A; Nerval, S. K; Patel, S. K; Regnier, M; San, M; Sanyal, S; Stutzer, N.O; Verma, A; Wehus, I. K; Zhou, Y (EDP Sciences, 2023-11)
    We present COSMOGLOBE Data Release 1, which implements the first joint analysis of WMAP and Planck LFI time-ordered data, processed within a single Bayesian end-to-end framework. This framework directly builds on a similar ...
  • Cosmoglobe: Towards end-to-end CMB cosmological parameter estimation without likelihood approximations 
    Eskilt, J. R; Lee, K; Watts, D. J; Anshu, V; Aurlien, R; Basyrov, A; Bersanelli, M; Colombo, L. P. L; Eriksen, H. K; Fornazier, K. S. F; Fuskeland, U; Galloway, M; Gjerlow, E; Hergt, L. T; Ihle, H. T; Lunde, J. G. S; Marins, A; Nerval, S. K; Paradiso, S; Rahman, Fazlu; San, M; Stutzer, N. O; Wehus, I. K (EDP Sciences, 2023-10)
    We implement support for a cosmological parameter estimation algorithm in Commander and quantify its computational efficiency and cost. For a semi-realistic simulation similar to Planck LFI 70 GHz, we find that the ...
  • Black hole shadow and acceleration bounds for spherically symmetric space times 
    Kajol, P; Kolekar, Sanved (American Physical Society, 2023-11-15)
    We explore an interesting connection between black hole shadow parameters and the acceleration bounds for radial linear uniformly accelerated (LUA) trajectories in static spherically symmetric black hole spacetime geometries ...
  • Towards Gender Equity in Indian Astronomy 
    Beri, Aru; Shastri, Prajval; Banyal, R. K; Chatterjee, Debarati; Chatterjee, Ritaban; Jassal, Harvinder; Kanekar, Nissim; Kharb, Preeti; Misra, Kuntal (2023-11)
    The Working Group for Gender Equity (WGGE) was formally constituted under the Astronomical Society of India (ASI) in 2015 to increase awareness about gender-related issues in the astrophysics community. The current ...
  • Disentangling the two sub-populations of early Herbig Be stars using VLT/X-shooter spectra 
    Shridharan, B; Mathew, B; Arun, R; Cysil, T. B; Subramaniam, A; Manoj, P; Maheswar, G; Sudheesh, T. P (EDP Sciences, 2023-11)
    Early Herbig Be (HBe) stars are massive, young stars accreting through the boundary layer mechanism. However, given the rapid (<2 Myr) evolution of early Herbig stars to the main-sequence phase, studying the evolution of ...
  • Bridging between Type IIb and Ib Supernovae: SN IIb 2022crv with a Very Thin Hydrogen Envelope 
    Gangopadhyay, Anjasha; Maeda, Keiichi; Singh, Avinash; Nayana, A. J; Nakaoka, Tatsuya; Kawabata, Koji S; Taguchi, Kenta; Singh, Mridweeka; Chandra, Poonam; Ryder, Stuart D; Dastidar, Raya; Yamanaka, Masayuki; Kawabata, Miho; Alsaberi, Rami Z. E; Dukiya, Naveen; Teja, Rishabh Singh; Ailawadhi, Bhavya; Dutta, Anirban; Sahu, D. K; Moriya, Takashi J; Misra, Kuntal; Tanaka, Masaomi; Chevalier, Roger; Tominaga, Nozomu; Uno, Kohki; Imazawa, Ryo; Hamada, Taisei; Hori, Tomoya; Isogai, Keisuke (American Astronomical Society, 2023-11-10)
    We present optical, near-infrared, and radio observations of supernova (SN) SN IIb 2022crv. We show that it retained a very thin H envelope and transitioned from an SN IIb to an SN Ib; prominent Hα seen in the pre-maximum ...
  • Asteroseismology Sheds Light on the Origin of Carbon-deficient Red Giants: Likely Merger Products and Linked to the Li-rich Giants 
    Maben, Sunayana; Campbel, Simon W; Bharat Kumar, Y; Reddy, B. E; Zhao, Gang (IOP Publishing, 2023-11-01)
    Carbon-deficient red giants (CDGs) are a peculiar class of stars that have eluded explanation for decades. We aim to better characterize CDGs by using asteroseismology (Kepler, TESS) combined with spectroscopy (APOGEE, LAMOST), ...

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