Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • Viscous dissipative two-temperature accretion flows around black holes 
    Sarkar, Shilpa; Chattopadhyay, Indranil (Journal of Astrophysics & Astronomy, 2022-12)
    General relativistic, advective, viscous, two-temperature accretion disc solutions are studied around a Schwarzschild black hole. The thermodynamics of the flow is described by the relativistic equation of state or ...
  • Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino 
    Reusch, Simeon ,et.al.; Paliya, Vaidehi S. (Physical Review Letters, 2022-06)
    The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE ...
  • The Relative Orientation between Local Magnetic Field and Galactic Plane in Low Latitude Dark Clouds 
    Choudhury, Gulafsha B. ,et.al.; Pandey, J. C. (Research in Astronomy and Astrophysics, 2022-07)
    In this work, we study the magnetic field morphology of selected star-forming clouds spread over the galactic latitude (b) range −10° to 10°. The polarimetric observations of clouds CB24, CB27 and CB188 are conducted ...
  • On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow 
    Das, Santabrata ,et.al.; Rakshit, Suvendu (Monthly Notices of the Royal Astronomical Society, 2022-08)
    We study the relativistic, inviscid, advective accretion flow around the black holes and investigate a key feature of the accretion flow, namely the shock waves. We observe that the shock-induced accretion solutions are ...
  • Long-term Multiband Near-infrared Variability of the Blazar OJ 287 during 2007–2021 
    Gupta, Alok C.; Kushwaha, Pankaj, et.al. (The Astrophysical Journal Supplement Series, 2022-06)
    We present the most extensive and well-sampled long-term multiband near-infrared (NIR) temporal and spectral variability study of OJ 287, considered to be the best candidate binary supermassive black hole blazar. ...
  • Exploring γ-Ray Flares in the Long-term Light Curves of CTA 102 at GeV Energies 
    Geng, Xiongfei; Kushwaha, Pankaj (The Astrophysical Journal Supplement Series, 2022-06)
    Blazar CTA 102 experienced an intense multiwavelength activity phase from 2015 to 2018; in particular, an unprecedented outburst was observed from 2016 October to 2017 February. In this work, we extract a 7 day binned γ-ray ...
  • Shocks in Radiatively Driven Time-dependent, Relativistic Jets around Black Holes 
    Joshi, Raj Kishor; Debnath, Sanjit; Chattopadhyay, Indranil (The Astrophysical Journal, 2022-07)
    We study time-dependent relativistic jets under the influence of the radiation field of the accretion disk. The accretion disk consists of an inner compact corona and an outer sub-Keplerian disk. The thermodynamics of ...
  • MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063 
    Jiang, Ji-an ,et.al.; Kumar, Brajesh (Astrophysical Journal Letters, 2022-07)
    In this Letter, we report the discovery of an ultraluminous fast-evolving transient in rest-frame UV wavelengths, MUSSES2020J, soon after its occurrence by using the Hyper Suprime-Cam (HSC) mounted on the 8.2 m ...
  • Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies 
    Ojha, Vineet; Jha, Vivek Kumar; Chand, Hum; Singh, Veeresh (Monthly Notices of the Royal Astronomical Society, 2022-08)
    To quantify the role of radio jets for Intra-Night Optical Variability (INOV) in radio-loud narrow-line Seyfert 1 (RLNLSy1) galaxies, we report the first systematic comparative INOV study of 23 RLNLSy1 galaxies, with 15 ...
  • GRB 210217A: a short or a long GRB? 
    Panchal, Dimple; Mishra, Kuntal; Ghosh, Ankur; Arun, K. G.; Gupta, Rahul; Kumar, Amit; Resmi, L.; Pandey, S. B. (Journal of Astrophysics & Astronomy, 2022-12)
    Gamma-ray bursts are traditionally classified as short and long bursts based on their T90 value (the time interval during which an instrument observes 5% to 95% of gamma-ray/hard X-ray fluence). However, T90 is dependent ...
  • An X-Ray Study of Coronally Connected Active Eclipsing Binaries 
    Singh, Gurpreet; Pandey, J. C. (The Astrophysical Journal, 2022-07)
    We present a detailed X-ray analysis and imaging of stellar coronae of five coronally connected eclipsing binaries, namely, 44 Boo, DV Psc, ER Vul, XY UMa, and TX Cnc. Both components of these binaries are found to ...
  • Tale of GRB 171010A/SN 2017htp and GRB 171205A/SN 2017iuk: Magnetar origin? 
    Kumar, Amit; Pandey, Shashi B.; Gupta, Rahul; Aryan, Amar; Ror, Amit Kumar; Sharma, Saurabh; Brahme, Nameeta (New Astronomy, 2022-11)
    We present late-time optical follow-up observations of GRB 171010A/SN 2017htp (𝑧 = 0.33) and low luminosity GRB 171205A/SN 2017iuk (𝑧 = 0.037) acquired using the 4K×4K CCD Imager mounted at the 3.6 m Devasthal Optical ...
  • Aerosols optical depth and Ångström exponent over different regions in Garhwal Himalaya, India 
    Deep, Amar, et.al.; Singh, Narendra (Environment Monit Assess, 2021-06)
    Aerosol optical depth (AOD) and Ångström exponent (AE) are observed to be important parameters in understanding the status of ambient aerosol concentration over a particular location and depend not only upon the local but ...
  • Global Nature of Solar Coronal Shock Waves Shown by Inconsistency between EUV Waves and Type II Radio Bursts 
    Fulara, Aarti; Kwon, Ryun-Young (2021-09)
    We re-examine the physical relationship between extreme ultraviolet (EUV) waves and type II radio bursts. It has been thought that they are two observational aspects of a single coronal shock wave. However, a lack of their ...
  • Classification of Variable Stars Light Curves Using Long Short Term Memory Network 
    Bassi, Saksham; Sharma, Kaushal; Gomekar, Atharva (Frontiers in Astronomy and Space Science, 2021-09)
    Owing to the current and upcoming extensive surveys studying the stellar variability, accurate and quicker methods are required for the astronomers to automate the classification of variable stars. The traditional approach ...
  • Gamma Rays from Fast Black-hole Winds 
    Ajello, M. ,et.al.; Paliya, V. (The Astrophysical Journal, 2021-11)
    Massive black holes at the centers of galaxies can launch powerful wide-angle winds that, if sustained over time, can unbind the gas from the stellar bulges of galaxies. These winds may be responsible for the observed ...
  • TANSPEC: TIFR-ARIES Near-infrared Spectrometer 
    Sharma, Saurabh, et.al; Ghosh, Arpan; Reddy, B. Krishna; Nanjappa, Nandish; Pandey, Rakesh; Sinha, Tirthendu; Panwar, Neelam; Sahu, Sanjit; Bangia, Tarun (Publications of the Astronomical Society of the Pacific, 2022-08)
    We present the design and performance of the TANSPEC, a medium-resolution 0.55–2.5 μm cryogenic spectrometer and imager, now in operation at the 3.6 m Devasthal Optical Telescope (DOT), Nainital, India. The TANSPEC provides ...
  • X-Ray Intraday Variability of the TeV Blazar Markarian 421 with XMM-Newton 
    Noel, A Priyana, et.al.; Gaur, Haritma; Gupta, Alok C.; Dhiman, Vinit (The Astrophysical Journal Supplement Series, 2022-09)
    Highly variable Markarian 421 is a bright high–synchrotron energy peaked blazar showing a wide featureless nonthermal spectrum, making it a good candidate for our study of intraday flux and spectral variations over time. We ...
  • Prominence oscillations activated by an EUV wave 
    Devi, Pooja, et.al.; Uddin, Wahab (Advances in Space Research, 2022-09)
    Prominence oscillations are one of interesting phenomena in the solar atmosphere, which can be utilized to infer the embedded mag netic field magnitude. We present here the transverse oscillations of two different prominences ...
  • Hard X-Ray Polarization Catalog for a Five-year Sample of Gamma-Ray Bursts Using AstroSat CZT Imager 
    Chattopadhyay, Tanmoy,et.al.; Gupta, Rahul (The Astrophysical Journal, 2022-09)
    The Cadmium Zinc Telluride Imager (CZTI) on board AstroSat has been regularly detecting gamma-ray bursts (GRBs) since its launch in 2015. Its sensitivity to polarization measurements at energies above 100 keV allows CZTI ...

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