1 citations · 2 across the 9 of their papers we have counts for
11 papers
Lomb-Scargle Recovery of Periodic Binary Signals across Black Hole Mass and Cadence
Karan Akbari, Sayantan Bhattacharya
Searches for periodic supermassive black hole binaries in quasar light curves rely on recovery fractions, the share of injected signals detected, which forecasts use as detection e…
A Unified Multi-Band Secular Framework for the Hierarchical Triple PSR J0435+3233 System
Achamveedu Gopakumar, Vidit Singh, Abhimanyu Susobhanan +9
The millisecond pulsar PSR J0435+3233, discovered by FAST, exhibits an unusually large apparent spin-down rate, potentially reflecting line-of-sight acceleration from a distant com…
Circumstellar Disc and X-ray Variability in the Be/X-ray Binary SXP 5.05 During its 2024 Outburst
Chintan Patel, Sayantan Bhattacharya, Karan Akbari +3
Be/X-ray binaries provide a unique opportunity to study the interaction between neutron stars and circumstellar discs. SXP 5.05 is a particularly rare system, exhibiting eclipse-li…
Probing heartbeat oscillations from the black hole X-ray binary GRS 1915+105 using spectral-timing analysis
Karan Akbari, Chintan Patel, Sayantan Bhattacharya +2
GRS 1915+105 is a black hole X-ray binary whose -class ("heartbeat") oscillations (50--100 s) are attributed to radiation-pressure instabilities in the inner accretion dis…
Degeneracy in Accretion Disk Spectra from Naked Singularities and Kerr Black Holes: Application to the AGN MCG-06-30-15
Vishva Patel, Sayantan Bhattacharya, Sudip Bhattacharyya +1
Theoretical studies suggest that gravitational collapse can form either a black hole or a visible (naked) singularity. Identifying observational signatures that distinguish these t…
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…
Spin period evolution and X-ray spectral characteristics of the SMC pulsar SXP 46.6
Aman Kaushik, Sayantan Bhattacharya, Sudip Bhattacharyya
We characterize the Small Magellanic Cloud (SMC) pulsar SXP 46.6 using NuSTAR observations conducted in 2017. The spin period (P) of this neutron star decreased from its discovered…
The X-ray Variability and Luminosity Function of High Mass X-ray Binaries in the Dwarf Starburst Galaxy IC 10
Breanna A. Binder, Rosalie Lazarus, Mina Thoresen +2
We present an analysis of 235 ks of Chandra observations obtained over 19 years of the nearby dwarf starburst galaxy IC 10 in order to study the X-ray variability and X…
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-…