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16 papers · 2 filters
Broadband Spectral Analysis of 1ES2344+514: A Multi-epoch study
Kishor Chaudhury, Abhradeep Roy, Varsha R. Chitnis +2
We present the results of the multi-epoch broadband spectral study of 1ES 2344+514 and study the evolution of physical parameters. We used nearly simultaneous data obtained from 20…
Measuring accretion disc properties in the transitional millisecond pulsar PSR J1023+0038 using XMM-Newton, NuSTAR, NICER and Chandra
Vishal Jadoliya, Mayukh Pahari, Sudip Bhattacharyya +1
Whether the accretion disc in the X-ray high-mode of transitional millisecond pulsars (tMSP) reaches near the neutron star surface by penetrating the magnetosphere is a crucial que…
A continuous transition from Type-C Quasi Periodic Oscillations to the Heartbeat state in the Black hole X-ray binary 4U 1630-47
Chintan Patel, Sayantan Bhattacharya, Karan Akbari +2
We present a timing analysis of the black hole X-ray binary (BHXRB) 4U 1630-47 using AstroSat observations from 10-19 March 2023, for the first time capturing a rare and rapid tran…
Infrared Synchrotron Emission in the Soft State of GX 339-4 and the Mid-Infrared/X-ray Luminosity Plane of Black Hole X-ray Binaries
P. Gandhi, D. M. Russell, M. C. Baglio +33
Progress in understanding the growth of accreting black holes remains hampered by a lack of sensitive coordinated multiwavelength observations. In particular, the mid-infrared (MIR…
Investigating four new candidate redback pulsars discovered in the image plane
Flora Petrou, Natasha Hurley-Walker, Sam McSweeney +12
This paper reports the discovery and follow-up of four candidate redback spider pulsars: GPM J1723-33, GPM J1734-28, GPM J1752-30 and GPM J1815-14, discovered with the Murchison Wi…
Constraining initial orbital eccentricity of inspiral-dominated gravitational-wave events with an analytic approximant
Hemantakumar Phurailatpam, Gopakumar Achamveedu, Maria Haney +2
The LIGO-Virgo-KAGRA consortium has sporadically detected inspiral-dominated gravitational-wave events such as GW170817 and GW190425. These events offer an opportunity to constrain…
Gravitational Wave Signatures of Quasi-Periodic Eruptions: LISA Detection Prospects for RX J1301.9+2747
Leif Lui, Alejandro Torres-Orjuela, Rudrani Kar Chowdhury +1
Quasiperiodic eruptions (QPEs) are intense, recurring outbursts of X-ray radiation originating from the nuclei of distant galaxies. One of the promising models of QPE explains thes…
A New Framework to Detect Multi-Messenger Signals from Bright Sporadic Stochastic Gravitational Wave Background
Hardik Jitendra Kuralkar, Mohit Raj Sah, Suvodip Mukherjee
The temporal dependence of the astrophysical stochastic gravitational-wave (GW) background (SGWB) in the hecto-hertz band brings a unique avenue to identify multi-messenger signals…
FRB 20250316A: A Brilliant and Nearby One-Off Fast Radio Burst Localized to 13 parsec Precision
FRB Collaboration, Thomas C. Abbott, Daniel Amouyal +83
Precise localizations of a small number of repeating fast radio bursts (FRBs) using very long baseline interferometry (VLBI) have enabled multiwavelength follow-up observations rev…
An unusual type-I X-ray burst from the neutron star X-ray binary IGR J17591-2342: a double-photospheric-radius-expansion burst?
Sudip Bhattacharyya, Akshay Singh, Andrea Sanna
Type-I X-ray bursts observed from neutron stars originate from intermittent unstable thermonuclear burning of accreted matter on these stars. Such bursts, particularly those reachi…
Post-glitch Recovery and the Neutron Star Structure: The Vela Pulsar
Himanshu Grover, Erbil Gügercinoğlu, Bhal Chandra Joshi +4
We present a detailed analysis of the Vela pulsar's rotational behaviour using approximately 100 months of observational data spanning from September 2016 to January 2025, during w…
Accretion inside astrophysical objects : Effects of rotation and viscosity
H. A. Adarsha, Chandrachur Chakraborty, Sudip Bhattacharyya
Sub-solar mass black holes could show up in gravitational wave observations in future and near-solar mass black holes might have been involved in the events GW190425 and GW190814.…
Magnetically arrested transmutation of a compact star
H. A. Adarsha, Chandrachur Chakraborty, Sudip Bhattacharyya
We introduce a novel mechanism -- Magnetically Arrested Transmutation (MAT) -- which could be a viable model to account for the observed over-representation of magnetic white dwarf…
What causes long outbursts of neutron star low-mass X-ray binaries?
Sayantan Bhattacharya, Sudip Bhattacharyya
Many neutron star low-mass X-ray binaries (NS LMXBs) with short orbital periods (~hours) cycle between outburst and quiescent phases, and thus provide an excellent way to study the…
Variability study of classical supergiant X-ray binary 4U 1907+09 using NuSTAR
Raj Kumar, Sayantan Bhattacharya, Sudip Bhattacharyya +1
We investigate the X-ray variability of the supergiant X-ray binary 4U 1907+09 using the new NuSTAR observation of 2024. The source had a relatively stable flux level during previo…
Be X-ray binary pulsar SXP 138: non-linear spin-down, pulse and spectral characteristics
Soham Pravin Sanyashiv, Sayantan Bhattacharya, Sudip Bhattacharyya
We study the timing and spectral properties of the Be/X-ray binary pulsar SXP 138 using four NuSTAR observations spanning 2016 to 2017. Analysis of the light curves using the Lomb-…