Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • TRANSITIONS AND PERSISTENCE OF BLAZAR STATE IN BEAMED RADIO QUASARS 
    Chand, Krishan (ARIES, Nainital, 2022-12)
    A compact region at the centre of a galaxy known as an active galactic nucleus (AGN) generates a significant amount of energy that is not directly due to stars. It is believed that the accretion of materials onto ...
  • Bridging between Type IIb and Ib Supernovae: SN IIb 2022crv with a Very Thin Hydrogen Envelope 
    Gangopadhyay, Anjasha; Maeda, Keiichi; Singh, Avinash; A. J, Nayana; 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; Singh Teja, Rishabh; 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 (The Astrophysical Journal, 2023-11)
    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 ...
  • Optical and X-ray Studies of TeV Blazars 
    Dhiman, Vinit (ARIES, Nainital, 2023-10-10)
    Blazars consisting of BL Lacertae objects (BL Lacs; featureless compsite optical/UV spectra) and flat-spectrum radio quasars (FSRQs; promi nent emission lines in composite optical/UV spectra), are the active galactic ...
  • Multiwavelength Observations of Gamma Ray Bursts 
    Gupta, Rahul (ARIES, Nainital, 2023-09)
    Gamma-ray bursts (GRBs) are fascinating sources studied in modern astronomy. They are extremely luminous electromagnetic (Lγ,iso ∼ 1048 − 1054 erg/s) explosions in the Universe observed from cosmological distances. These ...
  • Investigating the origin of optical flares from the TeV blazar S4 0954+65 
    Pandey, Ashwani; Bachev, Rumen; Czerny, Bo˙zena; Wiita, Paul J.; Gupta, Alok C.; Strigachev, Anton; Popowicz, Adam (Astronomy & astrophysics, 2023-11)
    Aims. We aim to investigate the extreme variability properties of the TeV blazar S4 0954+65 using optical photometric and polarisation observations carried out between 2017 and 2023 using three ground-based telescopes. Methods. ...
  • Investigating the Correlation of Outflow Kinematics with Radio Activity. VII. Gas Outflows in AGNs 
    Ayubinia, Ashraf; Woo, Jong-Hak; Rakshit, Suvendu; Son, Donghoon (The Astrophysical Journal, 2023-10)
    We explore the relationship between the ionized gas outflows and radio activity using a sample of ∼6000 active galactic nuclei (AGNs) at z < 0.4 with the kinematical measurement based on the $\left[{\rm{O}}\,{\rm\small{I ...
  • A Reemerging Bright Soft X-Ray State of the Changing-look Active Galactic Nucleus 1ES 1927+654: A Multiwavelength View 
    Ghosh, Ritesh; Rakshit, Suvendu; Pandey, Shivangi (The Astrophysical Journal, 2023-09)
    1ES1927+654 is a nearby active galactic nucleus (AGN) that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months to years. Here we report ...
  • A Coronal Mass Ejection Source Region Catalog and Their Associated Properties 
    Majumdar, Satabdwa; Patel, Ritesh; Pant, Vaibhav; Banerjee, Dipankar; Rawat, Aarushi; Pradhan, Abhas; Singh, Paritosh (The Astrophysical Journal Supplement Series, 2023-09)
    The primary objective of this study is to connect coronal mass ejections (CMEs) to their source regions, primarily to create a CME source region catalog, and secondarily to probe the influence that the source regions have ...
  • Impact of Annular Solar Eclipse on the Trace Gases and Dynamics of the Lower and Middle Atmosphere: Results Inferred From an Integrated Campaign “Suryagrahan-2019” 
    Das, Siddarth Shankar; Naja, Manish (Earth and space science, 2023-09)
    An integrated campaign “Suryagrahan-2019” with multi-institutional support was conducted by launching a series of radiosondes/ozonesondes over 6-different locations in India along with the operation of ST/MST radars and ...
  • Quasi-periodic oscillation detected in γ-rays in blazar PKS 0346−27 
    Prince, Raj; Banerjee, Anuvab; Sharma, Ajay; das, Avik Kumar; Gupta, Alok C.; Bose, Debanjan (Astronomy & astrophysics, 2023-10)
    Aims. We present a variability study of the blazar PKS 0346−27 conducted between December 2018 and January 2022 using archival γ-ray observations from Fermi-LAT. Methods. We used Lomb–Scargle periodogram and weighted ...
  • Revisiting Galactic Disk and Spiral Arms Using Open Clusters 
    Joshi, Yogesh C.; Malhotra, Sagar (The Astronomical Journal, 2023-10)
    We use the largest catalog of open clusters in the post-Gaia era to provide an observational view of the Galactic disk. By compiling physical parameters such as age, distance, and kinematic information, we investigate the ...
  • AutoTAB: Automatic Tracking Algorithm for Bipolar Magnetic Regions 
    Sreedevi, Anu; Jha, Bibhuti Kumar; Karak, Bidya Binay; Banerjee, Dipankar (The Astrophysical Journal Supplement Series, 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 ...
  • On the need of an ultramassive black hole in OJ 287 
    Valtonen, Mauri J.; Gupta, A. C. (Monthly Notices of the Royal Astronomical Society, 2023-10)
    The highly variable blazar OJ 287 is commonly discussed as an example of a binary black hole system. The 130 yr long optical light curve is well explained by a model where the central body is a massive black hole of 18.35 ...
  • Field blue straggler stars: discovery of white dwarf companions to blue metal-poor stars using UVIT/AstroSat 
    Panthi, Anju; Subramaniam, Annapurni; Vaidya, Kaushar; Jadhav, Vikrant; Rani, Sharmila; Thirupathi, Sivarani; Pandey, Sindhu (Monthly Notices of the Royal Astronomical Society, 2023-10)
    Blue metal-poor (BMP) stars are the main-sequence stars that appear bluer and more luminous than normal turn-off stars of metal-poor globular clusters. They are believed to be either field blue straggler stars (FBSS) ...
  • A SIMPLE APPROACH FOR DESIGNING A FILTER ON MICROSTRIP LINES 
    Kumar, Ashish (Applied Engineering Letters, 2019)
    This paper deals with the design and fabrication of edge-coupled band pass filter (BPF) circuit (fifth order) on microwave laminate for 4.5 GHz ± 0.5 GHz application. The design of filter is realized on a high quality ...
  • Observations on the distribution of clouds over northernIndia using joint CloudSat and CALIPSO measurements 
    Kumar, Ashish; Singh, Narendra; Singh, Anshumali (REMOTE SENSING LETTERS, 2019-02)
    A detailed study on the distribution of basic cloud types over thenorthern states of India (NSI) is performed using the decadal(2007–2016) raDAR-liDAR (DARDAR) data, which facilitates mergedCloudSat and Cloud aerosol liDAR ...
  • Detection of a quasi-periodic oscillation in γ -ray light curve of the high-redshift blazar B2 1520+31 
    Gupta, Alok C.; Tripathi, Ashutosh; Wiita, Paul J. (Monthly Notices of the Royal Astronomical Society, 2019-02)
    We detected a possible quasi-periodic oscillation (QPO) of ∼71 d in the 0.1–300 GeV γ-ray Fermi-Large Area Telescope light curve of the high-redshift flat spectrum radio quasar B2 1520+31. We identify and confirm that ...
  • Optical variability of TeV blazars on long time-scales 
    Gaur, Haritma; Gupta, Alok C; Bachev, R. (Monthly Notices of the Royal Astronomical Society, 2019-02)
    We present the results of photometric observations of three TeV blazars, 3C 66A, S4 0954+658, and BL Lacertae (BL Lac), during the period 2013–2017. Our extensive observations were performed in a total of 360 nights which ...
  • Long-term (1995–2018) aerosol optical depth derived using ground based AERONET and SKYNET measurements from aerosol aged-background sites 
    Ningombam, Shantikumar S.; Larson, E.J.L.; Dumka, U.C.; Estellés, Victor; Campanelli, M.; Steve, Colwell (Atmospheric Pollution Research, 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. ...
  • Characterizing Optical Variability of OJ 287 in 2016–2017 
    Gupta, Alok C. et al.; Gaur, Haritma; Pandey, A. (The Astronomical Journal, 2019-03)
    We report on a recent multiband optical photometric and polarimetric observational campaign of the blazar OJ 287 that was carried out during 2016 September–2017 December. We employed nine telescopes in Bulgaria, China, ...

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