Research Papers: Recent submissions

  • Photometric and kinematic studies of open cluster NGC 1027 
    Tripathi, Apara; Panwar, Neelam; SHARMA, SAURABH; Kumar, Brijesh; Rastogi, Shantanu (Journal Astrophysical Astronomy, 2023-06)
    We present photometric and kinematic analyses of an intermediate-age open cluster NGC 1027 using UBV(R I)c and Gaia Early Data Release 3 (EDR3) data. Structural and fundamental parameters, such as cluster center, cluster ...
  • Quiescence of an outburst of a low-mass young stellar object: LDN1415-IRS 
    SINGH, KOSHVENDRA; OJHA, DEVENDRA K.; NINAN, JOE P.; SHARMA, SAURABH; GHOSH, SUPRIYO; GHOSH, ARPAN; BHATT, BHUWAN C.; SAHU, DEVENDRA K. (Journal Astrophysical Astronomy, 2023-06)
    LDN1415-IRS, a low-mass young stellar object (YSO), went into an outburst between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb. LDN1415-Neb was found to have brightened by I = 3.77 mag by April 2006. The ...
  • Revisiting the Transit Timing and Atmosphere Characterization of the Neptune-mass Planet HAT-P-26 b 
    A-thano, Napaporn; Awiphan, Supachai; Jiang, Ing-Guey; Kerins, Eamonn; Priyadarshi, Akshay; McDonald, Iain; Joshi, Yogesh C.; Chulikorn, Thansuda; Hayes, Joshua J. C.; Charles, Stephen; Huang, Chung-Kai; Rattanamala, Ronnakrit; Yeh, Li-Chin; Dhillon, Vik S (The Astronomical Journal, 2023-12)
    We present a transit-timing variation (TTV) and planetary atmosphere analysis of the Neptune-mass planet HAT-P 26 b. We present a new set of 13 transit light curves from optical ground-based observations and combine ...
  • Investigating star-formation activity in Sh 2-61 H II region 
    PANDEY, RAKESH; SHARMA, SAURABH; DEWANGAN, LOKESH; VERMA, AAYUSHI; BAUG, TAPAS; KAUR, HARMEEN; GHOSH, ARPAN (Journal Astrophysical Astronomy, 2023-08)
    Using multi-wavelength data sets, we studied the star-formation activity in Hii region Sh 2-61 (hereafter S61). We identified a clustering in the region and estimated the membership using the Gaia proper motion data. The ...
  • Statistical analysis of dynamical evolution of open clusters 
    MAURYA, JAYANAND; JOSHI, Y. C.; SAMAL, MANASH RANJAN; RAWAT, VINEET; GOUR, ANUBHA SINGH (Journal Astrophysical Astronomy, 2023-07)
    We present the dynamical evolution of 10 open clusters, which were part of our previous studies. These clusters include both young and intermediate-age open clusters with ages ranging from 25 ± 19 Myr to 1.78 ± 0.20 Gyr. ...
  • Analysis of full-disc Hα observations: Carrington maps and filament properties in 1909–2022 
    Chatzistergos, Theodosios; Ermolli, Ilaria; Banerjee, Dipankar; Barata, Teresa; Chouinavas, Ioannis; Falco, Mariachiara; Gafeira, Ricardo; Giorgi, Fabrizio; Hanaoka, Yoichiro; Krivova, Natalie A.; Korokhin, Viktor V.; Lourenço, Ana; Marchenko, Gennady P.; Malherbe, Jean-Marie; Peixinho, Nuno; Romano, Paolo; Sakurai, Takashi (2023-12)
    Context. Full-disc observations of the Sun in the Hα line provide information about the solar chromosphere, and in particular, about the filaments, which are dark and elongated features that lie along magnetic field ...
  • Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey 
    Banerjee, Anuvab; Negi, Vibhore; Joshi, Ravi; Kumar, Nagendra; Wiita, Paul J.; Chand, Hum; Rawat, Nikita; Wu, Xue-Bing; Ho, Luis C. (Monthly Notices of the Royal Astronomical Society, 2023-12)
    We investigate the possible presence of quasi-periodic oscillation (QPO) signals in 2103 blazars from the Zwicky Transient Facility (ZTF) time-domain survey. We detect a low-frequency QPO signal in five blazars observed ...
  • Extreme photometric and polarimetric variability of blazar S4 0954+65 at its maximum optical and γ -ray brightness levels 
    Raiteri, C. M. , et.al.; Gaur, H.; Gupta, A. C.; Kishore, S.; Wani, K. (Monthly Notices of the Royal Astronomical Society, 2023-12)
    In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in the optical and γ -ray bands. We present optical photometric and polarimetric data acquired by the ...
  • Fragmentation and dynamics of dense gas structures in the proximity of massive young stellar object W42-MME 
    Bhadari, N. K.; Dewangan, L. K.; Pirogov, L. E.; Pazukhin, A. G.; Zinchenko, I. I.; Maity, A. K.; Sharma, Saurabh (Monthly Notices of the Royal Astronomical Society, 2023-12)
    We present an analysis of the dense gas structures in the immediate surroundings of the massive young stellar object (MYSO) W42-MME, using the high-resolution (0 .31 × 0 .25) Atacama Large Millimetre/submillimetre Array ...
  • Quiet, but not silent: uncovering quiescent state properties of two transient high-mass X-ray binaries 
    Raman, Gayathri; Varun; Pradhan, Pragati; Kennea, Jamie (Monthly Notices of the Royal Astronomical Society, 2023-12)
    We present the first set of broad-band spectral and timing studies of two transient X-ray pulsars, MXB 0656−072 and MAXI J1409−619 using NuSTAR observations conducted during quiescence. Despite being captured at one of ...
  • Optical spectroscopy of Gaia detected protostars with DOT: Can we probe protostellar photospheres? 
    NARANG, MAYANK; MANOJ, P.; TYAGI, HIMANSHU; NAYAK, PRASANTA K.; SHARMA, SAURABH; SURYA, ARUN; BANERJEE, BIHAN; MATHEW, BLESSON; GHOSH, ARPAN; VERMA, AAYUSHI (Journal Astrophysical Astronomy, 2023-11)
    Optical spectroscopy offers the most direct view of the stellar properties and the accretion indicators. Standard accretion tracers, such as Hβ, Hα and Ca II triplet lines, and most photospheric features fall in the optical ...
  • Identifying the population of T-Tauri stars in Taurus: UV–optical synergy 
    NAYAK, PRASANTA K.; NARANG, MAYANK; PURAVANKARA, MANOJ; TYAGI, HIMANSHU; BANERJEE, BIHAN; SHARMA, SAURABH; PANDEY, RAKESH; SURYA, ARUN; MATHEW, BLESSON; ARUN, R.; UJJWAL, K.; KARTHA, SREEJA S. (Journal Astrophysical Astronomy, 2023-09)
    With the third data release of the Gaia mission, Gaia DR3 with its precise photometry and astrometry, it is now possible to study the behavior of stars at a scale never seen before. In this paper, we developed new criteria ...
  • Understanding carbon sequestration trends using model and satellite data under different ecosystems in India 
    Gupta, Smrati; Burman, Pramit Kumar Deb; Tiwari, Yogesh K.; Dumka, Umesh Chandra; Kumari, Nikul; Srivastava, Ankur; Raghubanshi, Akhilesh S. (Science of the Total Environment, 2023-11)
    This study discusses carbon sequestration variability in different ecosystems of India. Four different biosphere regions, each over 0.5◦ × 0.5◦ area, have been selected considering the geospatial and climatic variability ...
  • New Insights in the Bubble Wall of NGC 3324: Intertwined Substructures and a Bipolar Morphology Uncovered by JWST 
    Dewangan, L. K.; Maity, A. K.; Mayya, Y. D.; Bhadari, N. K.; Bhattacharyya, Suman; Sharma, Saurabh; Banerjee, Gourav (The Astrophysical Journal, 2023-11)
    We report the discovery of intertwined/entangled substructures toward the bubble wall of NGC 3324 below a physical scale of 4500 au, which is the sharp edge/ionization front/elongated structure traced at the interface between ...
  • A LOFAR prompt search for radio emission accompanying X-ray flares in GRB 210112A 
    Hennessy, A.; Starling, R. L. C.; Rowlinson, A.; Ruiter, I. de; Kumar, A.; Eyles-Ferris, R. A. J.; Ror, A. K.; Anderson, G. E.; Gourdji, K.; Horst, A. J. van der; Pandey, S. B.; Shimwell, T. W.; Steeghs, D.; Stylianou, N.; Veen, S. ter; Wiersema, K.; Wijers, R. A. M. J. (2023-11)
    The composition of relativistic gamma-ray burst (GRB) jets and their emission mechanisms are still debated, and they could be matter or magnetically dominated. One way to distinguish these mechanisms arises because a ...
  • A novel approach for the prediction and analysis of daily concentrations of particulate matter using machine learning 
    Panneerselvam, Balamurugan; Ravichandran, Nagavinothini; Dumka, Umesh Chandra; Thomas, Maciej; Charoenlerkthawin, Warit; Bidorn, Butsawan (Science of the Total Environment, 2023-11)
    Traditional air quality analysis and prediction methods depend on the statistical and numerical analyses of historical air quality data with more information related to a specific region; therefore, the results are ...
  • Quasi-simultaneous Optical Flux and Polarization Variability of the Binary Super Massive Black Hole Blazar OJ 287 from 2015 to 2023: Detection of an Anticorrelation in Flux and Polarization Variability 
    Gupta, Alok C.; Kushwaha, Pankaj; Valtonen, Mauri J.; Savchenko, Sergey S.; Jorstad, Svetlana G.; Imazawa, Ryo; Wiita, Paul J.; Gu, Minfeng; Marscher, Alan P.; Zhang, Zhongli; Bachev, Rumen; Borman, G. A.; Gaur, Haritma; Grishina, T. S.; Hagen-Thorn, V. A.; Kopatskaya, E. N.; Larionov, V. M.; Larionova, E. G.; Larionova, L. V.; Morozova, D. A.; Nakaoka, T; Strigachev, A; Troitskaya, Yulia V.; Troitsky, I. S.; Uemura, M.; Vasilyev, A. A.; Weaver, Z. R.; Zhovtan, A. V. (Astrophysical Journal Letters, 2023-11)
    We study the optical flux and polarization variability of the binary black hole blazar OJ 287 using quasi simultaneous observations from 2015 to 2023 carried out using telescopes in the USA, Japan, Russia, Crimea, ...
  • 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 ...
  • 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 ...

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