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Browsing IIAP Publications by Title

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  • Explaining the Observed Polarization from Brown Dwarfs by Single Dust Scattering 
    Sengupta, S (The American Astronomical Society, 2003-03)
    Recent observation of linear optical polarization from brown dwarfs confirms the dust hypothesis in the atmospheres of brown dwarfs with effective temperature higher than 1400 K. The observed polarization could arise because ...
  • Exploiting large surveys for galactic astronomy 
    Corbally, C. J; Bailer-Jones, C. A. L; Giridhar, S; Lloyd Evans, T. H (Cambridge University Press, 2007-08)
    This summary of JD13, Exploiting large surveys for Galactic astronomy, is based on the talks that were given during the meeting and/or submitted to the full proceedings which appeared in MemSAI 77 no. 4, 2006. The electronic ...
  • Exploring diffuse radio emission in galaxy clusters and groups with uGMRT and SKA 
    Paul, Surajit; Kale, Ruta; Basu, Aritra; Sur, Sharanya; Parekh, Viral; Gupta, Prateek; Chatterjee, Swarna; Salunkhe, Sameer; Iqbal, Asif; Pandey-Pommier, Mamta; Raja, Ramij; Rahaman, Majidul; Raychaudhury, Somak; Nath, Biman B; Majumdar, Subhabrata (Indian Academy of Sciences, 2023-06)
    Diffuse radio emission has been detected in a considerable number of galaxy clusters and groups, revealing the presence of pervasive cosmic magnetic fields, and of relativistic particles in the large scale structure of the ...
  • Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA 
    Wagh, Sai; Pandey-Pommier, Mamta; Roy, Nirupam; Rashid, Md; Marcowith, Alexandre; Muthumariappan, C; Ramya, S; Roy, Subhashis; Guiderdoni, Bruno (American Astronomical Society, 2024-03-10)
    Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various ...
  • Exploring NGC 2345: A Comprehensive Study of a Young Open Cluster through Photometric and Kinematic Analysis 
    Belwal, Kuldeep; Bisht, D; Bisht, Mohit Singh; Rangwal, Geeta; Raj, Ashish; Dattatrey, Arvind K; Yadav, R. K. S; Bhatt, B. C (American Astronomical Society, 2024-05-01)
    We conducted a photometric and kinematic analysis of the young open cluster NGC 2345 using CCD UBV data from 2 m Himalayan Chandra Telescope, Gaia Data Release 3, Two Micron All-Sky Survey, and the Photometric All-Sky ...
  • Exploring pre-main sequence variables of ONC: the new variables 
    Parihar, P. S; Messina, S; Distefano, E; Shantikumar, N. S; Medhi, B. J (Wiley Blackwell, 2009-07)
    Since 2004, we have been engaged in a long-term observing program to monitor young stellar objects in the Orion Nebula Cluster. We have collected about two thousands frames in V, R, and I broad-band filters on more than ...
  • Exploring the Archives: A Search for Novae in UVIT Snapshots of M31 
    Basu, Judhajeet; Krishnendu, S; Barway, Sudhanshu; Chamoli, Shatakshi; Anupama, G. C (American Astronomical Society, 2024-08-10)
    Extensive multiwavelength studies of novae have been carried out in our galaxy and in M31 for decades. However, UV studies of extragalactic novae are limited, especially those in quiescence. For the first time, we present ...
  • Exploring the central region of NGC 1365 in the ultraviolet domain 
    Kurian, K. S; Stalin, C. S; Wylezalek, D; Lyubenova, Mariya; Adhikari, T. P; Devaraj, A; Sagar, R; Kissler-Patig, Markus; Mondal, Santanu (American Astronomical Society, 2024-10-10)
    Active galactic nuclei (AGN) feedback and its impact on their host galaxies are critical to our understanding of galaxy evolution. Here, we present a combined analysis of new high resolution ultraviolet (UV) data from the ...
  • Exploring the dynamic rotational profile of the hotter solar atmosphere: A multiwavelength approach using SDO/AIA data 
    Routh, Srinjana; Jha, Bibhuti K; Mishra, Dibya Kirti; Doorsselaere, Tom Van; Pant, V; Chatterjee, Subhamoy; Banerjee, D (American Astronomical Society, 2024-11-10)
    Understanding the global rotational profile of the solar atmosphere and its variation is fundamental to uncovering a comprehensive understanding of the dynamics of the solar magnetic field and the extent of coupling between ...
  • Exploring the optical behaviour of a Type Iax supernova SN 2014dt 
    Singh, M; Misra, K; Sahu, D. K; Dastidar, R; Gangopadhyay, A; Bose, S; Srivastav, S; Anupama, G. C; Chakradhari, N. K; Brajesh Kumar; Kumar, B; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-02)
    We present optical photometric (up to ∼ 410 d since B max ) and spectroscopic (up to ∼ 157 d since B max ) observations of a Type Iax supernova (SN) 2014dt located in M61. SN 2014dt is one of the brightest and ...
  • Exploring the outer emission corona spectroscopically by using Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 mission 
    Singh, J; Prasad, B. R; Venkata Suresh, Narra; Amit Kumar (Elsevier B.V, 2019-07-17)
    It is very important to make the spectrographic observations of the outer emission corona in number of emission lines simultaneously in view of the results of the observations made in [Fe x] 6374 A, [Fe xi] 7892 A, [Fe ...
  • Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars 
    Arellano Ferro, A; Figuera Jaimes, R; Giridhar, S; Bramich, D. M; Hernández Santisteban, J. V; Kuppuswamy, K (Wiley-Blackwell, 2011-09)
    We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than ...
  • Explosive and radio-selected transients: transient astronomy with square kilometre array and its precursors 
    Chandra, P; Anupama, G. C; Arun, K. G; Iyyani, S; Misra, K; Narasimha, D; Ray, A; Resmi, L; Roy, S; Sutaria, F. K (Springer, 2016-12)
    With the high sensitivity and wide-field coverage of the Square Kilometre Array (SKA), large samples of explosive transients are expected to be discovered. Radio wavelengths, especially in commensal survey mode, are ...
  • Extended Equivalence Principle: Implications for Gravity, Geometry and Thermodynamics 
    Sivaram, C; Arun, K (Handronic Press Inc, 2012)
    The equivalence principle was formulated by Einstein in an attempt to extend the concept of inertial frames to accelerated frames. Thereby bringing in gravity. In recent decades, it has been realized that gravity is linked ...
  • The extended H i disk and star formation in the dwarf spiral galaxy NGC 4701 
    Mousumi Das; Sengupta, C; Honey, M (IOP Publishing, 2019-02-01)
    We present H i, optical, and near-infrared observations of the nearby bulgeless, dwarf spiral galaxy NGC 4701. The galaxy lies on the Virgo filament and is one of the most gas-rich dwarfs in our local environment. Our aim ...
  • An extended mathched filter approach for the detection of hidden periodicities smeared by roughness 
    Vani, V. C; Chatterjee, S (Indian Academy of Science, 2004-01-10)
  • The extended solar cycle: muddying the waters of solar/stellar dynamo modeling or providing crucial observational constraints? 
    Srivastava, Abhishek K; McIntosh, Scott W; Arge, N; Banerjee, D; Dikpati, Mausumi; Dwivedi, Bhola N; Guhathakurta, Madhulika; Karak, B. B; Leamon, Robert J; Matthew, Shibu K; Munoz-Jaramillo, Andres; Nandy, D; Norton, Aimee; Upton, L; Chatterjee, S; Rakesh, M; Yamini K. Rao; Rahul Yadav (Frontiers, 2018-11-22)
    "In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle. Almost eighty years later, Hale described the nature of the ...
  • Extended use of two crossed Babinet compensators for wavefront sensing in adaptive optics 
    Lancelot, J. P; Saxena, A. K (SPIE, 2010-12)
    An extended use of two crossed Babinet compensators as a wavefront sensor for adaptive optics applications is proposed. This method is based on the lateral shearing interferometry technique in two directions. A single ...
  • Extending the sunspot area series from Kodaikanal Solar Observatory 
    Jha, Bibhuti K; Hegde, M; Priyadarshi, Aditya; Mandal, Sudip; Ravindra, B; Banerjee, D (Frontiers, 2022-10)
    Kodaikanal Solar Observatory (KoSO) possesses one of world's longest and homogeneous records of sunspot observations that span more than a century (1904–2017). Interestingly, these observations (originally recorded in ...
  • The extent of 3-min oscillations in regions other than sunspot plumes 
    Lin, C. -H; Banerjee, D; Doyle, J. G; O`Shea, E (EDP Science, 2005-12)
    The active region, AR0554, was observed with NIS/CDS on board SoHO to examine the extent and range of oscillations from a range of features. Among all the NIS spectral lines analysed, significant oscillations were found ...

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