61 citations · 263 across the 23 of their papers we have counts for
25 papers
GRB 220101A: a most energetic erg long GRB triggered by two supernovae 3.5 seconds apart
R. Ruffini, Y. Aimuratov, L. M. Becerra +10
GRB 220101A is a long GRB, with a total energy exceeding erg with a redshift and one of the largest ever high-quality multi-wavelength observational coverage,…
The B-Index as a Diagnostic of Cool Stars: Assessing Metallicity Dependence of TiO Absorption in the Visible Spectrum
Fatemeh Azizi, Mohammad Taghi Mirtorabi, Zahra Mohammadian
Molecular absorption features constitute essential diagnostics of late-type stellar atmospheres, with titanium oxide (TiO) bands serving as sensitive tracers of effective temperatu…
Titanium Oxide Absorption as a Proxy to Detect Long term Variation and Activity Cycle in Proxima Centauri
Fatemeh Azizi, Mohammad Taghi Mirtorabi, Rahimeh Foroughi
Stellar activity cycles on magnetically active stars can be estimated by molecular absorption bands. We have previously introduced a molecular index which compares absorptional lin…
Evidence for Two SNe Type Triggering GRB 220101A: a Pair SN and a Rotating Magnetized Core Collapse SN
R. Ruffini, M. T. Mirtorabi, P. Chardonnet +3
The traditional interpretation of gamma ray bursts (GRBs) as originating from a single black hole has been extended by the Binary Driven Hypernova (BdHN) model, in which a GRB aris…
FNet II: Spectral Classification of Quasars, Galaxies, Stars, and broad absorption line (BAL) Quasars
R. Moradi, F. Rastegarnia, Y. Wang +1
In this work, we enhance the FNet, a 1-dimensional convolutional neural network (CNN) with a residual neural network (ResNet) architecture, to perform spectral classification of qu…
Ten Supernova-rise in Binary Driven Gamma-ray Bursts
R. Ruffini, C. L. Bianco, Liang Li +6
The observation of a gamma-ray burst (GRB) associated with a supernova (SN) coincides remarkably with the energy output from a binary system comprising a very massive carbon-oxygen…
Probing electromagnetic-gravitational wave emission coincidence in type I binary-driven hypernova family of long GRBs at very-high redshift
C. L. Bianco, M. T. Mirtorabi, R. Moradi +7
The repointing time of the XRT instrument on the Neil Gehrels Swift Observatory satellite has posed challenges in observing and studying the early X-ray emissions within $\approx40…
The formation and evolution of Andromeda IX
Hedieh Abdollahi, Atefeh Javadi, Mohammad Taghi Mirtorabi +7
Local Group (LG), the nearest and most complete galactic environment, provides valuable information on the formation and evolution of the Universe. Studying galaxies of different s…
The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VI. The Star Formation History and Dust Production in Andromeda IX
Hedieh Abdollahi, Atefeh Javadi, Mohammad Taghi Mirtorabi +9
We present a photometric study of the resolved stellar populations in And IX, the closest satellite to the M31, a metal-poor and low-mass dwarf spheroidal galaxy. We estimate a dis…
The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies--V. The star formation history of Sagittarius dwarf irregular galaxy derived from long period variable stars
Tahere Parto, Shahrzad Dehghani, Atefeh Javadi +7
We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of June 2016 -- October 2017, using the 2.5-m Isaac Newton Telescope…
Deep Learning in Searching the Spectroscopic Redshift of Quasars
F. Rastegar Nia, M. T. Mirtorabi, R. Moradi +2
Studying the cosmological sources at their cosmological rest-frames is crucial to track the cosmic history and properties of compact objects. In view of the increasing data volume…
INT monitoring survey of Local Group dwarf galaxies: star formation history and chemical enrichment
Tahere Parto, Shahrzad Dehghani, Atefeh Javadi +12
The Local Group (LG) hosts many dwarf galaxies with diverse physical characteristics in terms of morphology, mass, star formation, and metallicity. To this end, LG can offer a uniq…
Chameleon Mechanism in Inhomogeneous Astrophysical Objects
Noshad Khosravi Largani, Mohammad Taghi Mirtorabi
Observational evidence implying the accelerated expansion of the universe has been the motivation to develop various classes of modified gravity theories. One of them uses the so-c…
Linear Polarization Features in the Quiet-Sun Photosphere: Structure and Dynamics
S. Kianfar, S. Jafarzadeh, M. T. Mirtorabi +1
We present detailed characteristics of linear polarization features (LPFs) in the quiet-Sun photosphere from high resolution observations obtained with Sunrise/IMaX. We explore dif…
The Delta Scuti star 38 Eri from the ground and from space
M. Paparo, Z. Kollath, R. R. Shobbrook +17
We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and…
Red Giant evolution in Modified Gravity
Sh. Najafi, M. T. Mirtorabi, Z. Ansari +1
In this paper, we study the chameleon profile in inhomogeneous density distributions and find that the fifth force in thin shell near the surface is weaker from what expected in ho…
A survey of TiOλ567 nm absorption in solar-type stars
Fatemeh Azizi, Mohammad Taghi Mirtorabi
Molecular absorption bands are estimators of stellar activity and spot cycles on magnetically active stars. We have previously introduced a new color index that compare absorption…
A New Titanium Oxide Index in Visual Band
Bahar Bidaran, Mohammad Taghi Mirtorabi, Fatemeh Azizi
We introduce a new color index consisting of two spectral band width to measure TiO absorption band strength centered at 567 nm. Based on the most up-to-date line list for TiO we r…
An Updated Wing TiO Sensitive Index for Classification of M-Type Stars
F. Azizi, M. T. Mirtorabi
By careful searching of synthetic and observed spectra in a sample of cool giant and supergiant stars, we have updated the continuum band-passes of near-infrared Wing three filter…
The UK Infrared Telescope M33 monitoring project. IV. Variable red giant stars across the galactic disc
Atefeh Javadi, Maryam Saberi, Jacco Th. van Loon +3
We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). The main aim was to identify stars in…
Local stability criterion for self-gravitating disks in modified gravity
Asiyeh Habibi, Mohammad Taghi Mirtorabi, Mahmood Roshan
We study local stability of self-gravitating fluid and stellar disk in the context of modified gravity theories which predict a Yukawa-like term in the gravitational potential of a…
The UK Infrared Telescope M33 monitoring project. III. Feedback from dusty stellar winds in the central square kiloparsec
Atefeh Javadi, Jacco Th. van Loon, Habib Khosroshahi +1
We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). The main aim was to identify stars in…
The UK Infrared Telescope M33 monitoring project. II. The star formation history in the central square kiloparsec
Atefeh Javadi, Jacco Th. van Loon, Mohammad Taghi Mirtorabi
We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). The main aim was to identify stars in…
Infrared Survey of Pulsating Giant Stars in the Spiral Galaxy M33: Dust Production, Star Formation History, and Galactic Structure
Atefeh Javadi, Jacco Th. van Loon, Mohammad Taghi Mirtorabi
We introduce a near-IR monitoring campaign of the Local Group spiral galaxy M33, carried out with the UK IR Telescope (UKIRT). The pulsating giant stars are identified and their di…