Research Papers: Recent submissions

  • Launching the VASCO Citizen Science Project 
    Villarroel, Beatriz, et.al.; Gupta, Alok C. (Universe, 2022-06)
    The Vanishing & Appearing Sources during a Century of Observations (VASCO) project investigates astronomical surveys spanning a time interval of 70 years, searching for unusual and exotic transients. We present herein ...
  • Revealing nature of GRB 210205A, ZTF21aaeyldq (AT2021any) and follow-up observations with the 4K 4K CCD imager + 3.6m DOT 
    Gupta, Rahul; Kumar, Amit; Pandey, Shashi Bhushan, et.al.; Ghosh, Ankur; Dimple; Misra, Kuntal; Kumar, Brajesh; Aryan, Amar (Journal Astrophysical Astronomy, 2022-06)
    Optical follow-up observations of optical afterglows of gamma-ray bursts are crucial to probe the geometry of outflows, emission mechanisms, energetics and burst environments. We performed the follow-up observations of ...
  • Study of Intra-Day Flux Distributions of Blazars Using XMM-Newton Satellite 
    Wani, Kiran; Gaur, Haritma (Universe, 2022-11)
    We present a study of the flux distribution of a sample of 15 Intermediate and Low-energy peaked blazars using XMM-Newton observations in a total of 57 epochs on short-term timescales. We characterise the X-ray variability ...
  • Comparison of ozonesonde measurements in the upper troposphere and lower Stratosphere in Northern India with reanalysis and chemistry‑climate‑model data 
    Fadnavis, Suvarna , et.al.; Naja, Manish (Scientific Reports, 2023-05)
    The variability and trend of ozone (O3) in the Upper troposphere and Lower Stratosphere (UTLS) over the Asian region needs to be accurately quantifed. Ozone in the UTLS radiatively heats this region and cools the upper ...
  • The Morphology and Dynamics of Relativistic Jets with Relativistic Equation of State 
    Joshi, Raj Kishor; Chattopadhyay, Indranil (The Astrophysical Journal, 2023-05)
    We study the effect of plasma composition on the dynamics and morphology of relativistic astrophysical jets. Our work is based on a relativistic total variation diminishing simulation code. We use a relativistic equation ...
  • Evidence for Two Distinct Populations of Kilonova-associated Gamma-Ray Bursts 
    Dimple; Misra, K.; Arun, K. G. (Astrophysical Journal Letters, 2023-06)
    Identification of gamma-ray burst (GRB) progenitors based on the duration of their prompt emission (T90) has faced several roadblocks recently. Long-duration GRBs (with T90 > 2 s) have traditionally been thought to ...
  • Star-forming site RAFGL 5085: Is a perfect candidate of hub-filament system? 
    Dewangan, L. K.,et.al; Shrama, Saurabh (Journal Astrophysical Astronomy, 2023-06)
    To investigate the star-formation process, we present a multi-wavelength study of a massive star forming site RAFGL 5085, which has been associated with the molecular outflow, Hii region and near-infrared cluster. The ...
  • PYTANSPEC: A data reduction package for TANSPEC 
    Ghosh, Supriyo; Ninan, Joe P.; Ojha, Devendra K.; Shrama, Saurabh (Journal Astrophysical Astronomy, 2023-06)
    TIFR-ARIES Near Infrared Spectrometer (TANSPEC) instrument provides simultaneous wave length coverage from 0.55 to 2.5 μm, mounted on India’s largest ground-based telescope, 3.6-m Devasthal Optical Telescope at Nainital, ...
  • Investigating morphology and CO gas kinematics of Sh2-112 region 
    Mallick, Kshitiz K.; Shrama, Saurabh, et.al; Panwar, Neelam (Journal Astrophysical Astronomy, 2023-06)
    We present a study of the molecular cloud in Sh2-112 massive star forming region using the 3-2 transition of CO isotopologues: CO, 13CO and C18O; supplemented in part by CGPS Hi line emission and MSX data. Sh2-112 is an ...
  • Survey of Hα emission-line stars in the star-forming region IC 5070 
    Panwar, Neelam; Jose, Jessy; Rishi, C (Journal Astrophysical Astronomy, 2023-06)
    Actively accreting young stellar objects show Hα emission line in their spectra. We present the results of survey for Hα emission-line stars in the star-forming region IC 5070 taken with 2-m Himalyan Chandra Telescope. ...
  • Peeping into recent star-formation history of Magellanic Clouds 
    Joshi, Y. C; Panchal, A. (Journal Astrophysical Astronomy, 2023-06)
    We study the distribution of fundamental-mode Cepheids in the Magellanic Clouds as a function of their positions and ages using the data from the OGLE IV survey. The ages of the Cepheids are determined through well known ...
  • Teutsch 76: A deep near-infrared study 
    Shrama, Saurabh, et.al; Panwar, Neelam; Verma, Aayushi; Ghosh, Arpan; Chand, Tarak (Journal Astrophysical Astronomy, 2023-06)
    We have performed a detailed analysis on the Teutsch 76 (T76) open cluster using the deep near infrared (NIR) observations taken with the TANSPEC instrument mounted on the 3.6m Devasthal optical telescope along with the ...
  • PAH emission features in star-forming regions and late type stars 
    Anand, Rahul Kumar; Rastogi, Shantanu; Kumar, Brijesh (Journal Astrophysical Astronomy, 2023-06)
    Mid-infrared emission spectra, obtained from ISO archive, of thirteen astrophysical objects as well as computed spectra of 27 polycyclic aromatic hydrocarbon (PAH) molecules are studied. All the objects show strong ...
  • Spectroscopy of nine eruptive young variables using TANSPEC 
    Ghosh, Arpan; Shrama, Saurabh, et.al; Verma, Aayushi (Journal Astrophysical Astronomy, 2023-06)
    In recent times, 3.6m Devasthal Optical Telescope (DOT) has been installed with an optical to near infra-red spectrograph, TANSPEC, which provides spectral coverage from 0.55 to 2.5 microns. Using TANSPEC, we have obtained ...
  • TIRCAM2 fast sub-array readout mode for lunar occultation studies 
    Naik, Milind B.,et.al; Shrama, Saurabh; Ghosh, Arpan (Journal Astrophysical Astronomy, 2023-06)
    TIFR Near Infrared Imaging Camera-II (TIRCAM2) is being used at the Devasthal Optical Telescope (DOT) operated by Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, Uttarakhand, India. In addition ...
  • Kronberger 55: A candidate for end-dominated collapse scenario 
    Verma, Aayushi; Shrama, Saurabh, et.al; Ghosh, Arpan (Journal Astrophysical Astronomy, 2023-06)
    Using optical photometric observations from 1.3-m Devasthal Fast Optical Telescope and deep near infrared (NIR) photometric observations from TANSPEC mounted on 3.6-m Devasthal Optical Telescope, along with the multi-wavelength ...
  • Type Ia supernovae SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex: similar to 09dc-like? 
    Tiwari, S.; Chakradhari, N. K.; Sahu, D. K.; Anupama, G. C.; Kumar, B.; Sahu, K. R. (Monthly Notices of the Royal Astronomical Society, 2023-06)
    We present optical photometric and spectroscopic studies of three supernovae (SNe): SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex (SN 2016ccj). UV–optical photometric data of ASASSN-16ex obtained with the Swift ...
  • Multiband optical variability of a newly discovered 12 blazars sample from 2013 – 2019 
    Jovanovic, Miljana D.; Damljanovic, Goran; Taris, Francois; Gupta, Alok C.; Bhatta, Gopal (Monthly Notices of the Royal Astronomical Society, 2023-06)
    Here we present the first optical photometric monitoring results of a sample of 12 newly discovered blazars from the ICRF – Gaia CRF astrometric link. The observations were performed from April 2013 to August 2019 using ...
  • Intra-night optical flux and polarization variability of BL Lacertae during its 2020–2021 high state 
    Bachev, Rumen; Tripathi, Tushar; Gupta, Alok C.; Kishore, Shubham; Gaur, Haritma; Dhiman, Vinit (Monthly Notices of the Royal Astronomical Society, 2023-06)
    In this work, we report the presence of rapid intra-night optical variations in both flux and polarization of the blazar BL Lacertae during its unprecedented 2020–2021 high state of brightness. The object showed significant ...
  • Defining the Middle Corona 
    West, Matthew J, et.al; Banerjee, Dipankar (Solar Physics, 2023-06)
    The middle corona, the region roughly spanning heliocentric distances from 1.5 to 6 so lar radii, encompasses almost all of the influential physical transitions and processes that govern the behavior of coronal outflow ...

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