27 citations · 87 across the 19 of their papers we have counts for
19 papers
The first comprehensive spectral and timing study of the ultra-compact X-ray binary 4U 1812-12 with NICER and NuSTAR
Swarnendu Jana, Aditya S. Mondal, Aru Beri +1
The source 4U 1812-12 is a persistent, weakly variable low-mass X-ray binary containing a neutron star. The source was observed by NICER between 2019 and 2021 and, more recently, b…
On the effect of gravitational repulsion on geodesic deviation in the Schwarzschild-de Sitter spacetime
Rohit Ghosh, Biplab Raychaudhuri, Aditya S. Mondal +1
Here we discuss the effect of gravitational repulsion on geodesic deviation in the Schwarzschild-de Sitter spacetime. In particular, the geodesic deviation shows different behaviou…
On the assessment of the disk truncation and detection of type-II bursts from the accreting millisecond X-ray Pulsar IGR J17062-6143
Aditya Sow Mondal, Mahasweta Bhattacharya, Swarnendu Jana +2
We present a spectral analysis of the NuSTAR and NICER observations of the accreting millisecond X-ray pulsar IGR J17062-6143, performed in 2022. The source remained in the hard sp…
Probing the accretion geometry of the transient accreting millisecond pulsar SAX J1808.4-3658: transitions to the propeller regime
Mahasweta Bhattacharya, Aditya S. Mondal, Gulab C. Dewangan
We analyze three NuSTAR observations and two NICER observations of the transient accreting millisecond pulsar SAX J1808.4-3658 in the hard spectral state during its most recent out…
Exploring the spectral characteristics of the periodic burster 4U 1323-62: Type-I X-ray burst and persistent emission
Mahasweta Bhattacharya, Aditya S. Mondal, Biplab Raychaudhuri +1
We report on the results obtained by the analysis of persistent and type-I thermonuclear X-ray burst emission observed from the periodic burster 4U 1323-62. These analyses are base…
NuSTAR discovers a long type-I X-ray burst from the clocked burster GS 1826-24
Aditya S. Mondal, Mayukh Pahari, Gulab C. Dewangan
The source GS~1826-24 is a neutron star low mass X-ray binary known as the 'clocked burster' because of its extremely regular bursting behavior. We report on the detection of a lon…
Relativistic X-ray reflection from the accreting millisecond X-ray pulsar IGR J17498-2921
Mahasweta Bhattacharya, Aditya S. Mondal, Mayukh Pahari +3
The accreting millisecond X-ray pulsar IGR J17498-2921 went into X-ray outburst on April 13-15, 2023, for the first time since its discovery on August 11, 2011. Here, we report on…
NuSTAR view of the X-ray transients Swift J174805.3-244637 and IGR J17511-3057
Aditya S. Mondal, Mahasweta Bhattacharya, Mayukh Pahari +3
We report on the NuSTAR observations of the neutron star low-mass X-ray binary Swift J174805.3-244637 (hereafter Swift~J17480) and the accreting millisecond X-ray pulsar IGR~J17511…
Relativistic X-ray reflection and highly ionized absorption in the spectrum of NS LMXB 1A 1744-361
Aditya S. Mondal, B. Raychaudhuri, G. C. Dewangan
We present the results from the spectral and timing analysis of the accreting neutron star 1A~1744-361 from the \nustar{} observation performed in its 2022 outbursts. The unabsorbe…
The complex spectral behavior of the newly discovered neutron star X-ray binary Swift J1858.6-0814
Aditya S. Mondal, B. Raychaudhuri, Gulab C Dewangan
We report on the \nustar{} observation of the newly discovered neutron star X-ray binary Swift~J1858.6-0814 taken on 23rd March 2019. The light curve of the source exhibits several…
Evidence of hard power-law spectral cutoff and disc reflection features from the X-ray transient XTE J1739-285
Aditya S. Mondal, B. Raychaudhuri, G. C. Dewangan +1
We report on the nearly simultaneous \nicer{} and \nustar{} observations of the known X-ray transient XTE~J1739-285. These observations provide the first sensitive hard X-ray spect…
NuSTAR and AstroSat observations of thermonuclear X-ray bursts with short-recurrence times in 4U 1636536
Pinaki Roy, Aru Beri, Aditya S. Mondal
We report results from the spectro-timing analysis of the atoll source 4U 1636536 observed with NuSTAR and AstroSat during its hard spectral state. In three observations of 207…
Evidence of disc reflection in the X-ray spectrum of the neutron star low mass X-ray binary 4U 1636-536
Aditya S. Mondal, B. Raychaudhuri, G. C. Dewangan
We present a broadband spectral analysis of the atoll source 4U~1636-536 observed for ks with \nustar{}. The source was found to be in a low-luminosity state during this o…
On the disc reflection spectroscopy of NS LMXB Serpens~X-1: analysis of a recent NuSTAR observation
Aditya S. Mondal, Gulab C. Dewangan, B. Raychaudhuri
We present \nustar{} observation of the atoll type neutron star (NS) low-mass X-ray binary (LMXB) Serpens~X-1 (Ser~X-1) performed on 17 February 2018. We observed Ser~X-1 in a soft…
Study of the reflection spectrum of the bright atoll source GX 3+1 with NuSTAR
Aditya S. Mondal, G. C. Dewangan, B. Raychaudhuri
We report on the \nustar{} observation of the atoll type neutron star (NS) low-mass X-ray binary GX~3+1 performed on 17 October 2017. The source was found in a soft X-ray spectral…
NuSTAR view of the Z-type neutron star low-mass X-ray binary Cygnus~X--2
Aditya S. Mondal, Gulab C. Dewangan, Mayukh Pahari +1
We report on the \nustar{} observation of the Z-type neutron star low-mass X-ray binary Cygnus X--2 performed on 7 January 2015. During this observation, the source exhibited sudde…
Broadband X-ray emission and the reality of the broad iron line from the Neutron Star - White Dwarf X-ray binary 4U 1820-30
Aditya S. Mondal, Gulab C. Dewangan, Mayukh Pahari +3
Broad relativistic iron lines from neutron star X-ray binaries are important probes of the inner accretion disk. The X-ray reflection features can be weakened due to strong magneti…
NuSTAR and Swift joint view of neutron star X-ray binary 4U~1728--34 : Disc reflection in the island and lower banana states
Aditya Sow Mondal, Mayukh Pahari, Gulab C. Dewangan +2
We analyze two simultaneous \nustar{} and \swift{} data of the Atoll type neutron star (NS) X-ray binary 4U~1728--34 observed on 1 and 3 October, 2013. Based on power density spect…
XMM-Newton view of a hard X-ray transient IGR J17497-2821
Md. Shah Alam, Dipanjan Mukherjee, Aditya S. Mondal +3
We present spectral and energy dependent timing characteristics of the hard X-ray transient IGR J17497-2821 based on XMM-Newton observations performed five and nine days after its…