IIA Institutional Repository: Recent submissions

  • A Deep Study of the Open Cluster NGC 5288 Using Photometric and Astrometric Data from GAIA DR3 and 2MASS 
    Sethi, Ritika; Bisht, D; Rangwal, Geeta; Raj, A (Instituto de Astronomıa, Universidad Nacional Autonoma de Mexico, 2023-10)
    This paper investigates a poorly studied open cluster, NGC 5288, using 2MASS JHKS and the recently released Gaia DR3 astrometric and photometric data. The mean proper motions in right ascension and declination are estimated ...
  • Simulating medium-spectral-resolution exoplanet characterization with SCALES angular/reference differential imaging 
    Desai, Aditi; Sallum, Stephanie E; Banyal, R. K; Batalha, Natalie; Batalha, Natasha; Blake, Geoff; Brandt, Tim; Briesemeister, Zack; Kleer, Katherine de; Pater, Imke de; Eisner, Josh; Fong, Wen-fai; Greene, Tom; Honda, Mitsuhiko; Kain, Isabel; Kilpatrick, Charlie; Lach, Mackenzie; Liu, Mike; Macintosh, Bruce; Martinez, Raquel A; Mawet, Dimitri; Miles, Brittany; Morley, Caroline; Powell, Diana; Sheehan, Patrick; Skemer, Andrew J; Spilker, Justin; Stelter, R. Deno; Stone, Jordan; Surya, Arun; Sivarani, T; Wagner, Kevin; Zhou, Yifan (SPIE-The International Society for Optical Engineering, 2023-10)
    SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) is a 2 - 5 micron high-contrast lenslet-based integral field spectrograph (IFS) designed to characterize exoplanets and their atmospheres. The SCALES ...
  • Mass-varying dark matter and its cosmological signature 
    Das, Anirban; Das, Subinoy; Sethi, Shiv K. (American Physical Society, 2023-10-15)
    Nontrivial dark sector physics continues to be an interesting avenue in our quest to the nature of dark matter. In this paper, we study the cosmological signatures of mass-varying dark matter where its mass changes from ...
  • AutoTAB: Automatic Tracking Algorithm for Bipolar Magnetic Regions 
    Sreedevi, Anu; Jha, Bibhuti K; Karak, Bidya Binay; Banerjee, D (American Astronomical Society, 2023-10)
    Bipolar magnetic regions (BMRs) provide crucial information about solar magnetism. They exhibit varying morphology and magnetic properties throughout their lifetime, and studying these properties can provide valuable ...
  • Dynamics of Photospheric Magnetic Flux Distribution and Variations in Solar RVs: A Study Using HARPS-N Solar and SDO Observations 
    Sen, Anisha; Rajaguru, S. P (American Astronomical Society, 2023-10-20)
    The distribution and evolution of photospheric magnetic fields in sunspots, plages, and network, and variations in their relative flux content, play key roles in radial velocity (RV) fluctuations observed in Sun-as-a-star ...
  • Recovering simulated planet and disk signals using SCALES aperture masking 
    Lacha, Mackenzie R; Sallum, Steph; Banyal, R. K; Batalha, Natalie; Blake, Geoff; Brandt, Tim; Briesemeister, Zackery; Desai, Aditi; Eisner, Josh; Fong, Wen-fai; Greene, Tom; Honda, Mitsuhiko; Kain, Isabel; Kilpatrick, Charlie; Kleer, Katherine de; Liu, Michael; Macintosh, Bruce; Martinez, Raquel; Mawet, Dimitri; Miles, Brittany; Morley, Caroline; Pater, Imke de; Powell, Diana; Sheehan, Patrick; Skemer, Andrew; Spilker, Justin; Stelter, Deno; Stone, Jordan; Surya, Arun; Sivarani, T; Wagner, Kevin; Zhou, Yifan (SPIE - The International Society for Optical Engineering, 2023-10)
    The Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES) instrument is a lenslet-based integral field spectrograph that will operate at 2 to 5 microns, imaging and characterizing colder (and thus ...
  • Magnetic Field and Plasma Diagnostics for Solar Coronal Mass Ejections: A Case Study Using the Forward Modeling Approach 
    Liu, X; Tian, H; Torok, T; Gibson, S; Yang, Z; Li, W; Samanta, T (Springer Nature B.V., 2023-10)
    The proposed COronal Solar Magnetism Observatory (COSMO) Large Coronagraph (LC) will provide unique observations to study coronal mass ejections (CMEs) with its ability to diagnose the magnetic field and plasma properties ...
  • Scalable platform for adaptive optics real-time control, part 2: field programmable gate array implementation and performance 
    Surendran, Avinash; Burse, Mahesh P.; Ramaprakash, A. N; Parihar, P. S (SPIE-Society of Photo-Optical Instrumentation Engineers, 2018-07)
    The next generation of adaptive optics (AO) systems on large telescopes will require immense computation performance and memory bandwidth, both of which are challenging with the technology available today. The objective ...
  • Scalable platform for adaptive optics real-time control, part 1: concept, architecture, and validation 
    Surendran, Avinash; Burse, Mahesh P.; Ramaprakash, A. N; Paul, Jyotirmay; Das, Hillol K.; Parihar, P. S (SPIE-Society of Photo-Optical Instrumentation Engineers, 2018-07)
    We demonstrate an architecture for adaptive optics (AO) control based on field programmable gate arrays (FPGAs), making active use of their configurable parallel processing capability. The unique capabilities of scalable ...
  • 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 ...

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