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Cosmic implications of Kaniadakis HDE model in Chern-Simons modified gravity New Astron. (IF 2.0) Pub Date : 2024-03-16 Sarfraz Ali, Muhammad Kamran, Umber Sheikh
In this study, we investigate the FRW model in the Chern–Simons modified gravity framework, considering holographic dark energy and Kaniadakis holographic dark energy models. Employing the field equation of Chern–Simons gravity, it is analyzed some important cosmological parameters such as density, equation of state, and deceleration parameters for both models. Our findings, presented visually through
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A fast photometric image alignment algorithm with row and column means New Astron. (IF 2.0) Pub Date : 2024-03-13 Jie Zheng, Linqiao Jiang, Jianfeng Tian
This paper introduces an astronomical image alignment algorithm. This algorithm uses the means of the rows and columns of the original image for alignment, and finds the optimal offset corresponding to the maximum similarity by comparing different offsets between images. The similarity is evaluated by the standard deviation of the quotient divided by the means. This paper also discusses the theoretical
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Joule Thomson expansion, Maxwell equal area law and topological interpretation of Phantom RN AdS black holes New Astron. (IF 2.0) Pub Date : 2024-03-11 M. Umair Shahzad, Aqsa Mehmood, Ramish Gohar, Ali Övgün
This paper is devoted to study the thermodynamic topological defects, Joule-Thomson () and Maxwell’s equal area law of Phantom RN AdS black holes (BHs). The inversion temperatures and inversion curves are obtained and by using the isenthalpic curves in the temperature-pressure () plane to locate the cooling and heating regions. Using Maxwell’s equal-area law, we select different independent conjugate
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Double-layered anisotropic stellar model of embedding class I with gaseous envelope New Astron. (IF 2.0) Pub Date : 2024-03-07 Amos V. Mathias, Jason M. Mkenyeleye, Jefta M. Sunzu
The current paper presents a double-layered neutral anisotropic stellar model in general relativistic setting. The model is developed by using Einstein field equations and class I embedding condition. We consider the core with quark matter obeying linear equation of state and envelope layer with gaseous matter admitting Chaplygin gas equation of state. The interior and exterior metric coefficients
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Automatically verifying molecular clumps based on supervised learning New Astron. (IF 2.0) Pub Date : 2024-03-05 Chen Long, Sheng Zheng, Yao Huang, Shuguang Zeng, Zhibo Jiang, Zhiwei Chen, Xiaoyu Luo, Yu Jiang, Xiangyun Zeng
The detection and statistical analysis of molecular clumps can provide important clues for understanding star formation. In order to improve the reliability of candidates identified by molecular clump detection algorithm, we present a molecular clump verification network (called MCVnet) based on supervised learning in this paper. First, a molecular clump detection algorithm is used to identify the
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Analysis of bouncing cosmology in non-Riemannian geometry New Astron. (IF 2.0) Pub Date : 2024-02-29 M. Sharif, M. Zeeshan Gul, Nusrat Fatima
The main objective of this manuscript is to investigate the bouncing cosmology in the background of gravity, where defines the non-metricity. For this purpose, we use the reconstruction approach and consider a flat Friedmann–Robertson–Walker spacetime with perfect matter configuration. We examine how the first contracting phase gives the expansion by using a temporal derivative of the scale factor
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Deflection angle of light in an black hole with primary scalar hair geometry New Astron. (IF 2.0) Pub Date : 2024-02-29 Farzan Mushtaq, Xia Tiecheng
Weak gravitational lensing of the primary scalar hair black hole is proposed within this work. We can figure out the deflection angle of light by applying the Gibbons and Werner approach with a primary scalar hair black hole. To do this, we compute the Gaussian curvature and find the deflection angle of the weak field limits by applying Gauss-Bonnet theorem. Furthermore, we compute the deflection angle
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Two forms of dark energy in fractal cosmological model using specific Hubble parameter New Astron. (IF 2.0) Pub Date : 2024-02-29 D.D. Pawar, D.K. Raut, A.P. Kale
The main objective of this article is to study the fractal FRW cosmological model consisting two forms of dark energy. We studied behavior of the universe in a fractal framework using dark energy accommodated in our universe. The solution of field equations are obtained by using Hubble parameter for transit scale factor . We have obtained the best fitting values of the model parameters and by constraining
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Photometric study of the overcontact binary NSVS2910034 New Astron. (IF 2.0) Pub Date : 2024-02-28 R. Wes Tobin, Robert C. Berrington
We present BVR+TESS differential photometry of an eclipsing binary system NSVS 2910034. A period analysis reveals unusual variations that are inconsistent with systemic orbital period changes and may be due to surface activity. The best fit models are consistent with a W-type W UMa overcontact binary, consisting of a less massive G7 spectral type star and a more massive K1 spectral type star. An O’Connell
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Explaining supernova remnant G352.7-0.1 as a peculiar type Ia supernova inside a planetary nebula New Astron. (IF 2.0) Pub Date : 2024-02-27 N, o, a, m, , S, o, k, e, r
I identify a point-symmetric morphology of the supernova remnant (SNR) G352.7-0.1 and propose that the outer axially-symmetric structure is the remnant of a common envelope evolution (CEE) of the progenitor system, while the inner structure is the ejecta of a thermonuclear explosion triggered by the merger of a white dwarf (WD) and the core of an asymptotic giant branch (AGB) star. The main radio structure
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The timing of resurfacing events in Southern Kasei Valles New Astron. (IF 2.0) Pub Date : 2024-02-22 Deniz Yazıcı, Cengiz Yıldırım, Tolga Görüm
The second-largest outflow system on Mars is Kasei Valles. The southern branch of Kasei Valles includes two inner channels among the best-preserved examples of glacial and/or fluvial erosion. This study focuses on the landforms formed by surface processes within the midstream part of the southern branch of the Kasei Valles. We mapped the landforms and built a morpho-stratigraphical chronology using
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A portable S-DIMM developed for preliminary measurement of seeing for Solar Site Survey: Theory and one case study New Astron. (IF 2.0) Pub Date : 2024-02-21 Xiao-Mei Duan, Yu Liu, Teng-Fei Song, Feng-Rong Zhu
Imaging quality is highly important for astronomical observations. The imaging quality of a telescope depends not only on the capabilities of the telescope itself but also on its location. When distant stars pass the atmosphere, due to the presence of atmospheric turbulence, the imaging quality becomes degraded. The atmospheric coherence length is the most commonly used parameter to evaluate the influence
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Unveiling compact planetary nebulae: Broad-band survey analysis and LAMOST confirmation New Astron. (IF 2.0) Pub Date : 2024-02-16 L.A. Gutiérrez-Soto, M. Belén Mari, W.A. Weidmann, F.R. Faifer
Planetary nebulae (PNe) are pivotal for advancing our knowledge of stellar evolution and galactic chemical enrichment. Recent progress in surveys and data analysis has revolutionized PN research, leading to the discovery of new objects and deeper insights into their properties. We have devised a novel photometric selection method, integrating GAIA and Pan-STARRS photometry, to identify compact PN candidates
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Novel hydrodynamic schemes capturing shocks and contact discontinuities and comparison study with existing methods New Astron. (IF 2.0) Pub Date : 2024-02-16 Takuhiro Yuasa, Masao Mori
We present a new hydrodynamic scheme named Godunov Density-Independent Smoothed Particle Hydrodynamics (GDISPH), that can accurately handle shock waves and contact discontinuities without any manually tuned parameters. This is in contrast to the standard formulation of smoothed particle hydrodynamics (SSPH), which requires the parameters for an artificial viscosity term to handle the shocks and struggles
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Impact of modified gravitational theory on the viability of wormhole structures New Astron. (IF 2.0) Pub Date : 2024-02-15 M. Zeeshan Gul, M. Sharif, Iqra Kanwal
This paper explores the existence of viable traversable wormhole solutions in the framework of theory, where represents the Ricci scalar and denotes the Gauss–Bonnet term. We study the wormhole geometry by focusing on a static spherical spacetime with anisotropic matter configuration. The suitable shape function for the static wormhole structure is developed through the Karmarkar condition. Using this
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Berkeley 76: An intermediate age open star cluster in Gaia Era New Astron. (IF 2.0) Pub Date : 2024-02-07 Deepak Bisht, D. Bisht, A. Raj, Geeta Rangwal, Devesh P. Sariya, Mehul Manu
We studied the open star cluster Berkeley 76 using Gaia DR3 and 2MASS data sets. We obtained 314 most probable cluster members with a membership probability greater than 80%. We have found the cluster center as = 106.67 ± 0.07 deg and 0.07 deg. The mean PMs of cluster members in right ascension and declination are 0.22 and 1.35 ± 0.19 mas yr, respectively. The radial density profile estimates the cluster’s
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Role of modified Chaplygin gas in Little Rip phenomena from interaction between dark energy and dark matter New Astron. (IF 2.0) Pub Date : 2024-02-05 R, a, j, a, n, i, , S, h, e, l, o, t, e
In this article, an interacting dark energy (DE)- dark matter (DM) scenario has been considered in a flat Friedmann–Lemaitre–Robertson–Walker (FLRW) cosmological model, where DE has a variable equation-of-state that follows the modified Chaplygin-like equation of state (Eq. (1)) characterized by two time dependent parameters and and DM has a non-zero equation of state . Gravitational equations of motion
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Effect of perturbed potential of heterogeneous triaxial rigid bodies of [formula omitted] layers on the stability of libration points in the R3BP New Astron. (IF 2.0) Pub Date : 2024-02-03 Kumari Shalini, Pankaj Sharma, Kumari Ranjana
In this paper, we investigate the motion of an infinitesimal mass in the restricted three-body problem by taking both the primaries as heterogeneous triaxial rigid bodies with layers. The potential of the proposed model and the equations of motion for the infinitesimal mass are derived. Our findings reveal the existence of five libration points denoted as in the proposed model, with three being collinear
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Structure of compact stars: A pure geometric approach New Astron. (IF 2.0) Pub Date : 2024-02-02 M.I. Wanas, Samah A. Ammar, Mona M. Foda
This paper uses pure geometric field theory to construct a stellar model for a static spherically symmetric anisotropic compact star. The expression pure geometry means that all physical quantities and fields are defined in terms of the geometric objects of the geometry used. This implies the possibility of defining the material-energy tensor geometrically, not phenomenologically, from the geometry
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Particle dynamics and thermodynamical analysis of the rotating ModMax black holes New Astron. (IF 2.0) Pub Date : 2024-02-02 Khurshid Karshiboev, Farruh Atamurotov, Ali Övgün, Ahmadjon Abdujabbarov, Eldor Karimbaev
In this research paper, we investigate the structure of the horizon and ergosphere of a rotating ModMax black hole. The motion of test particles is analyzed by studying the characteristics of the innermost stable circular orbit (ISCO) and the behavior of the effective potential. Different values of the screening factor and the charge of the rotating ModMax black hole are explored in this study. Moreover
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Gaia (DR3)-based astronomical analysis of the seven unstudied open star clusters New Astron. (IF 2.0) Pub Date : 2024-02-02 W.A. Badawy, A.L. Tadross, Y.H.M. Hendy, M.N. Ismail, A. Mouner
The seven open star clusters FSR 0717, FSR 1698, Loden 2313, Ruprecht 49, Majaess 61, Mayer 2, and Teutsch 48, which are located near the Milky Way’s Galactic plane are studied in this article using the Gaia DR3 dataset. The estimated numbers of potential cluster members are 102, 362, 285, 197, 95, 116, 160, and 397, correspondingly. The calculated radius values are 3.100.20, 3.200.30, 5.100.10, 5
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Decoupled charged anisotropic spherical solutions in Rastall gravity New Astron. (IF 2.0) Pub Date : 2024-02-01 M. Sharif, M. Sallah
This paper uses the gravitational decoupling through the minimal geometric deformation approach and extends a known isotropic solution for a self-gravitating interior to two types of anisotropic spherical solutions in Rastall gravity in the presence of electromagnetic field. By deforming only the radial metric component, the field equations are decoupled into two sets, the first of which corresponds
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Numerical solution of the coupled Lane–Emden–Fowler type equation using the variational iteration method and the Adomian polynomial New Astron. (IF 2.0) Pub Date : 2024-01-28 Vikash Kumar Sinha, Prashanth Maroju
In this article, we introduce an efficient numerical approach for finding the numerical solution for coupled Lane–Emden–Fower type equations using the variational iteration method combined with the Adomian polynomial. The convergence analysis of the proposed approach is investigated under very general conditions. A couple of numerical examples are included and contrasted with the existing methods (Singh
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Detection of possible glycine precursor molecule methylamine towards the hot molecular core G358.93–0.03 MM1 New Astron. (IF 2.0) Pub Date : 2024-01-28 Arijit Manna, Sabyasachi Pal
The search for the simplest amino acid, glycine (), in the interstellar medium (ISM) has become a never-ending story for astrochemistry and astrophysics researchers because that molecule plays a possible connection between the Universe and the origin of life. In the last forty years, all searches for in the ISM at millimeter and submillimeter wavelengths have failed. Since the detection of in the ISM
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The analysis of type II and type III solar radio bursts: GUI for the e-CALLISTO data New Astron. (IF 2.0) Pub Date : 2024-01-26 Yashan Hettiarachchi, Janaka Adassuriya, Chandana Jayaratne, Sasani Jayawardhana, Christian Monstein
Solar radio bursts are sudden peaks in the low-frequency radio emissions originating from the sun. These emissions, while revealing important insights into underlying physical mechanisms in solar physics, can also help predict space weather events that could have adverse effects on satellite communications and the global energy grid. A thorough understanding of this phenomena demands the collection
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The preliminary statistical analysis of LAMOST DR10 low resolution AFGK stars based on different metal abundances New Astron. (IF 2.0) Pub Date : 2024-01-26 Y, ., H, ., , C, h, e, n
LAMOST DR10 low resolution catalog (LRC) v1.0 has released 7,478,650 AFGK type stars with corresponding parameters and small parameter errors. These spectra are observed from October 2011 to July 2022. These AFGK stars are a large sample with very small stellar parameter errors, which are very suitable for statistical research work. The stars with [Fe/H] from -2.5 to -2.0, -1.5 to -1.3, and 0.5 to
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Dark matter supporting traversable wormholes in the Galactic halo New Astron. (IF 2.0) Pub Date : 2024-01-20 Susmita Sarkar, Nayan Sarkar, Somi Aktar, Moumita Sarkar, Farook Rahaman, Anil Kumar Yadav
We study the Morris-Thorne traversable asymptotically flat and non-flat wormholes in the galactic halo of the Milky Way Galaxy(MWG) based on the Einasto dark matter(DM) density profile. Our reported shape function is positive and increasing in nature, moreover, satisfies all the essential wormhole representing conditions i.e. the reported shape function forms wormhole like structures in the galactic
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Revisiting the quasi-periodic oscillations in blazar PG 1553+113 with multi-wavebands data New Astron. (IF 2.0) Pub Date : 2024-01-11 Yutong Chen, Tingfeng Yi, Junping Chen, He Lu, Yuncai Shen, Junjie Wang, Liang Wang, Shun Zhang, Lisheng Mao, Liang Dong
The blazar PG 1553+113 is hypothesized to harbor a supermassive black hole binary system, a scenario that aligns with its observed physical characteristics. In this study, we re-examine the authenticity of the periodicity of PG 1553+113 by conducting a comprehensive analysis of multi-wavebands periodic light variations, using the updated light curve data of more than 15 years. We used two methods to
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Complexity of dynamical spherical system in f(R,T2) gravity New Astron. (IF 2.0) Pub Date : 2024-01-04 M. Sharif, Saba Naz
This paper presents complexity measure of a dynamical spherical configuration with anisotropic distribution in energy–momentum squared gravity. The self-gravitating bodies become complex due to non-uniform energy density, asymmetrical pressure, heat loss and contribution of modified terms. By orthogonally decomposing the Riemann tensor, we analyze the structure scalars and obtain the complexity factor
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COSMOLOGICAL CONSTANT ROLL OF INFLATION WITHIN FINSLER-BARTHEL-KROPINA GEOMETRY: A GEOMETRIC APPROACH TO EARLY UNIVERSE DYNAMICS New Astron. (IF 2.0) Pub Date : 2024-01-05 S K Narasimhamurthy, Praveen J
This present work delves into the study of cosmological constant roll inflation, approaching it through the lens of Finsler-Barthel-Kropina geometry. This novel framework explains the conventional understanding of the large-scale structure of universe's homogeneity and isotropy with small-scale presence of anisotropy. The methodology employed in this work involves translating the concept of osculating
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Weak gravitational lensing and fundamental frequencies of Einstein–Euler–Heisenberg black hole New Astron. (IF 2.0) Pub Date : 2024-01-03 Farzan Mushtaq, Xia Tiecheng, Allah Ditta, Farruh Atamurotov, Alisher Abduvokhidov, Alimova Asalkhon
This paper is suggested to analyze the gravitational weak lensing and fundamental frequencies in the framework of the Einstein–Euler–Heisenberg (EEH) black hole. We compute the deflection angle of light by the EEH black hole in weak field limits. Which represents that the bending of light is a global and topological effect. For this purpose, we deduce the Gaussian curvature and apply the Gauss–Bonnet
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Possible evidences from H(z) parameter data for physics beyond ΛCDM New Astron. (IF 2.0) Pub Date : 2023-12-21 Rong-Jia Yang
We analyze H(z) parameter data with some conditions by using Lagrange mean value theorem in Calculus. We find that: (1) there exists decelerated phase at 1 σ confidence level in the redshift range (0.38,0.59); (2) the equation of state of dark energy may be less than −1 at 1 σ confidence level at some redshifts in the redshift range (1.3,1.53); (3) there exists accelerated phase at 1 σ confidence level
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Dependence of star formation rate on different properties of molecular clouds New Astron. (IF 2.0) Pub Date : 2023-12-22 Ashok Mondal, Tanuka Chattopadhyay
Properties of molecular clouds (MCs) lying in our Galaxy and their star formation scenarios have been investigated with the help of multivariate unsupervised machine learning techniques concerning several observable parameters. At first, the MCs have been classified into four coherent groups using the standard K-means clustering method. Subsequently, the optimum number of groups has been estimated
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On curvature related geometric properties of Hayward black hole spacetime New Astron. (IF 2.0) Pub Date : 2023-12-22 Absos Ali Shaikh, Shyamal Kumar Hui, Biswa Ranjan Datta, Mousumi Sarkar
This paper is devoted to the study of curvature properties of Hayward black hole (briefly, HBH) spacetime, which is a solution of Einstein field equations (briefly, EFE) having non-vanishing cosmological constant. We have proved that the HBH spacetime is an Einstein manifold of level 2, 2-quasi Einstein, generalized quasi-Einstein and Roter type manifold. Also, it is shown that the nature of the HBH
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Study of anisotropic stellar structures in f(R,φ,χ) theory New Astron. (IF 2.0) Pub Date : 2023-12-21 M. Sharif, Maryam Shakeel, M. Zeeshan Gul
This manuscript examines how effective matter variables influence the geometry of compact stellar objects with anisotropic matter configuration in modified f(R,φ,χ) gravity, where R represents the Ricci scalar, φ is the scalar field and χ is a kinetic term depending on the scalar field. The unknown constants in the metric potentials are determined by the smooth matching of an interior region with the
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The astrophysical S factor of p+9Be radiative capture reaction in a potential model New Astron. (IF 2.0) Pub Date : 2023-12-15 Leila Asgari, Hossein Sadeghi, Hassan Khalili
In this work, we calculate the S-factor for p+9Be Radiative Capture Reaction according to a modified potential model. We consider the sum of all possible electrical and magnetic transitions as a total cross-section. The zero-energy S-factor results are in good agreement with previously theoretical studies and the experimentally reported data.
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Investigating the albedo effects on the dynamics of infinitesimal mass in the elliptic Sitnikov five-body problem New Astron. (IF 2.0) Pub Date : 2023-12-12 M. Shahbaz Ullah, M. Javed Idrisi, Kumari Shalini
In this paper, we aim to showcase the significant impacts of albedo and eccentricity of the primaries on the infinitesimal mass within the elliptic case of the Sitnikov five-body problem. The Van der Pol transformation and averaging technique were employed to formulate the averaged equations of motion for the infinitesimal mass. Subsequently, the Hamiltonian equations of motion were derived using the
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Probing the amplitude modulation and pulsational energy re-distribution in the oscillation of HD 137949 New Astron. (IF 2.0) Pub Date : 2023-12-13 C.N. Ofodum, P.N. Okeke, B.I. Okere
We present the result of over 50-h of Johnson-B photometric observation of HD 137949. These high-speed photometric data were acquired between June 12 and August 19 2013 using the 0.5-m telescope of the South African Astronomical Observatory (SAAO). The result of our frequency analysis when compared with that of similar B-light photometric data obtained in 1981 and 1987 using the same telescope reveals
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Motion and zero velocity curves of a dust grain around collinear libration points for the binary IRAS 11472-0800 and G29-38 with a triaxial star and variable masses New Astron. (IF 2.0) Pub Date : 2023-12-12 Oni Leke, Orum Samuel
This paper investigates motion and zero velocity curves of a dust grain around collinear libration points (CLPs) of the circular restricted three-body problem (R3BP) when both stars IRAS 11472-0800 and G29-38 vary their masses according to the unified Mestschersky law (UML) and their motion is described by the Gylden-Mestschersky problem (GMP) with further assumption that the bigger body is a variable
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Evidence of a sub-solar star in a microlensing event toward the LMC New Astron. (IF 2.0) Pub Date : 2023-12-05 A. Franco, A.A. Nucita, F. De Paolis, F. Strafella
Gravitational microlensing is known to be an impressive tool for searching dark, small, and compact objects that are missed by the usual astronomical observations. In this paper, by analysing multiple images acquired by DECam, we present the detection and a complete description of the microlensing event LMC J05074558-65574990 which is most likely due to a sub-solar object with mass (0.16±0.10) M⊙,
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Impact of spacetime curvature on the physical behaviour of Vaidya and Tikekar (VT) type anisotropic compact objects New Astron. (IF 2.0) Pub Date : 2023-11-29 Lipi Baskey, Shyam Das, Ranjan Sharma, Farook Rahaman
The Vaidya and Tikekar (1982) ansatz has so far provided numerous stellar solutions which are useful for the description of compact stars like neutron stars and quark stars. We re-examine the impacts of the spacetime curvature parameter of the Vaidya–Tikekar ansatz on the physical properties of the relativistic anisotropic star. For a spherically symmetric, static and anisotropic stellar configuration
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Investigation of an eclipsing binary star V1848 Orionis New Astron. (IF 2.0) Pub Date : 2023-11-25 Ronnakrit Rattanamala, Pranita Sappankum, Suwanit Wutsang, Pornapa Artsang, Pensri Pramukkul, Thitima Suknoi
The aim of this research is to study the variation in the orbital period and the physical parameters of the eclipsing binary system V1848 Orionis. The data for this study were observed and collected at the Thai National Observatory (TNO) and the Regional Observatory for Public, Chachoengsao (ROP-CCO) operated by the National Astronomical Research Institute of Thailand (NARIT) in the B, V, R and I bands
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Electromagnetic effects on static celestial objects in modified gravity New Astron. (IF 2.0) Pub Date : 2023-11-22 M. Sharif, K. Hassan
This paper aims to figure out the existence and development of some particular celestial bodies possessing charged anisotropic interiors in the framework of f(G,T) gravity. The modified field equations corresponding to a quadratic G2+ℵT model are established in which MIT bag model equation of state is employed to engage the role of bag constant, where ℵ symbolizes the coupling parameter. We then consider
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Cosmic expansion and Noether Gauge symmetries in f(R,T,RμνTμν) gravity New Astron. (IF 2.0) Pub Date : 2023-11-22 Iqra Nawazish, M. Sharif
The present work explores different evolutionary phases of isotropically homogeneous and flat cosmos filled with dust fluid in non-minimally coupled gravity. We consider different models of this gravity to discuss the presence of symmetry generators together with conserved integrals using Noether Gauge symmetry scheme. In most of the cases, we obtain temporal and scaling symmetries that yield conservation
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Dynamical behavior of ambipolar diffusion during the gravitational collapse of a radiative cooling filamentary cloud New Astron. (IF 2.0) Pub Date : 2023-11-20 Mahmoud Gholipour
This work aims to investigate the dynamic behavior of ambipolar diffusion during the gravitational collapse of a filamentary molecular cloud undergoing radiative cooling. The cloud undergoes collapse in the presence of the ambipolar diffusion effect while being cooled by radiation. According to the observations of CO emissions, the cooling rate is scaled as a function of density and temperature. Furthermore
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BD UMi: Eccentric detached binary with γ Doradus type component New Astron. (IF 2.0) Pub Date : 2023-11-18 Birol Gürol
BD UMi is an Algol-type eccentric eclipsing binary with one of the components showing γ Doradus type pulsation. In this study we used the Transiting Exoplanet Survey Satellite (TESS) observations of the BD UMi system published in total of 16 sectors. We obtained the minima times of the eclipsing system and refined new light elements by using (O−C) technique. Out-of-eclipse variation related to the
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Influence of modified gravity on self-gravitating stellar objects New Astron. (IF 2.0) Pub Date : 2023-11-11 M. Sharif, K. Hassan
This paper focuses on studying the self-gravitating spherical compositions enclosing anisotropic fluid distribution in the context of f(G,T) theory. The modified field equations representing anisotropic source are formulated, and then the MIT bag model equation of state is used to contribute the participation of bag constant. The mathematical equations are thoroughly computed using a quadratic f(G
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(ωT−ωT′)-phase space analysis of interacting Tsallis holographic dark energy in f(Q) gravity New Astron. (IF 2.0) Pub Date : 2023-11-11 S.H. Shekh
In the present analysis the cosmological evolution of an interacting scenario between Tsallis holographic dark energy (THDE) and pressure less dark matter with Hubble’s scale as IR cutoff of the universe in flat FRW space–time within the framework of f(Q) gravity is analyzed. Also, governed the features of the f(Q) gravity model using some cosmological parameters like energy density, deceleration parameter
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The chaotic behavior of black holes: Investigating a topological retraction in anti-de Sitter spaces New Astron. (IF 2.0) Pub Date : 2023-11-08 Mohammed Abu Saleem, Ali Taani
In some topological universe models, a special type of curved space called the anti-de Sitter (AdS) of black hole space appears. Due to general relativity, this space has negative curvature. Here we present a novel variant of AdS space, known as chaotic AdS black hole space. We investigate the correlation between the folding of chaotic AdS black hole space and its chaotic deformation retract. In order
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Pulsating components of the eclipsing binaries with long period eccentric orbits New Astron. (IF 2.0) Pub Date : 2023-11-07 Ezgi Yoldaş, Hasan Ali Dal, Orkun Özdarcan
Taking into account the results found by analysing the Kepler data together with our photometric observations, we present new findings about KIC 5217733 and KIC 11671429, which are two highly eccentric detached eclipsing binaries. We estimate that the radii of the primary and secondary components should be, respectively, 5.41 ± 0.07 R⊙ and 1.59 ± 0.07 R⊙, while their masses should be 2.59 ± 0.09 M⊙
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The contact binary system TYC 7275-1968-1 as seen by optical, UV and X-ray observations New Astron. (IF 2.0) Pub Date : 2023-11-10 I.J. Lima, A.C. Mattiuci, G.J.M. Luna, A.S. Oliveira, C.V. Rodrigues, N. Palivanas, N.E. Nuñez
We present an analysis of publicly available X-ray and optical observations of TYC 7275-1968-1, a contact binary, red nova progenitor candidate. The long optical time series of ASAS-3, SuperWASP, CRTS, Gaia, ASAS-SN, and TESS enabled us to improve its orbital period to 0.3828071 ± 0.0000026 d. We show the presence of an X-ray and UV source associated with TYC 7275-1968-1 from Neil Gehrels Swift Observatory
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Theory on the common universes, in relation to the universes inserted in the relational multiverse New Astron. (IF 2.0) Pub Date : 2023-11-05 Jhon Jairo Mosquera Rodas
The research presents the theory of the existence of the relational macrouniverse with the infinite possibility of common universes, which share the essential elements of the multiverse theory, generating the possibility of the existence of the organisation of this network universe, i.e. that the universes are included in themselves and that they respond to common relations and principles of organisation
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Hints of point-symmetric structures in SN 1987A: The jittering jets explosion mechanism New Astron. (IF 2.0) Pub Date : 2023-11-07 Noam Soker
I identify a point-symmetric structure composed of three pairs of clumps in the recently released JWST image of the ejecta of SN 1987A and argue that these pairs of clumps support the jittering jets explosion mechanism (JJEM) for SN 1987A. I compare this point-symmetric structure with the multipolar-lobe morphology of a post-asymptotic giant branch nebula. The three pairs of clumps in the post-AGB
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Gravitational mass and approximate Lie symmetries for the charged Hayward black hole New Astron. (IF 2.0) Pub Date : 2023-11-07 Asia Liaqat, Ibrar Hussain
Here we investigate the gravitational mass (energy) of the charged Hayward black hole utilizing the notion of the approximate version of the Lie symmetries. To investigate the approximate symmetries of the second-order perturbed geodesic equations and the gravitational mass for the charged Hayward black hole, we consider the black hole mass M and the charge Q as a small perturbation parameter ϵ. We
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Phase transition of Bianchi-type I cosmological model in f(T) gravity New Astron. (IF 2.0) Pub Date : 2023-11-04 L. Anjana Devi, S. Surendra Singh, Md Khurshid Alam
In the context of the f(T) theory of gravity, where T represents as a torsion scalar, we explore the Locally Rotational Symmetric Bianchi type-I dark energy model. An effective cosmological model is used, and its isotropization is examined, producing a conclusion that accurately depicts the evolution of our Universe. We looked at dark energy (DE) and dark matter (DM) in both interacting and non-interacting
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Discovery of four new EL CVn-type binaries in the Gaia eclipsing binaries New Astron. (IF 2.0) Pub Date : 2023-11-03 Yuhui Peng, Kun Wang, Anbing Ren
In this paper, we performed a search for EL CVn-type binaries based on the Gaia and TESS data. Through the combination of the Gaia DR3 eclipsing binary catalogue and the Gaia DR3 spectroscopic binary catalogue, we have identified 13 stars exhibiting EL CVn-like characteristics. Among these stars, nine have already been identified as EL CVn binaries, while the remaining four are newly discovered candidates
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Multi-wavelength photometric study of five contact binaries in the field of globular cluster M4 New Astron. (IF 2.0) Pub Date : 2023-11-02 Shanti Priya Devarapalli, Rukmini Jagirdar, Ravi Raja Pothuneni, Dereje Wakgari Amente, Vineet Thomas, Margarita Safonova, Noah Brosch
Binary stars are believed to be key determinants in understanding globular cluster evolution. In this paper, we present the Multi-band photometric analyses of five variables in the nearest galactic globular cluster M4, from the observations of CASE, M4 Core Project with HST for four variables (V48, V49, V51, and V55) and the data collected from T40 and C18 Telescopes of Wise Observatory for one variable
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Neutron stars with polytropic equation of state New Astron. (IF 2.0) Pub Date : 2023-10-30 Nisha Godani, Gauranga C. Samanta
In this work, the neutron star model is considered in the framework of general relativity with the polytropic equation of state p=ργ, where γ=1+1k and k is known as a polytropic index. The homotopy perturbation method is used to solve Tolman–Oppenheimer–Volkoff (TOV) equation which gives the mass of the stellar structure. The solution of Einstein’s field equations is obtained and stability, causality