Publications (83)
The LOFT perspective on neutron star thermonuclear bursts
J. J. M. in 't Zand, D. Altamirano, D. R. Ballantyne +31
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT f…
Discovery of Thermonuclear Type-I X-ray Bursts from the X-ray binary MAXI J1807+132
A. C. Albayati, D. Altamirano, G. K. Jaisawal +13
MAXI J1807+132 is a low-mass X-ray binary (LMXB) first detected in outburst in 2017. Observations during the 2017 outburst did not allow for an unambiguous identification of the na…
Study of Evolution and Geo-effectiveness of CME-CME Interactions using MHD Simulations with SWASTi framework
Prateek Mayank, Stefan Lotz, Bhargav Vaidya +2
The geo-effectiveness of Coronal Mass Ejections (CMEs) is a critical area of study in space weather, particularly in the lesser-explored domain of CME-CME interactions and their ge…
Evidence for distinctive changes in the solar wind helium abundance in cycle 24
Yogesh, D. Chakrabarty, N. Srivastava
The relative abundance of alpha particles with respect to proton, usually expressed as = ()*100, is known to respond to solar activity although changes in its be…
A deep search for radio emission from three X-ray pulsars : are radio emission and X-ray pulsations anticorrelated ?
R. P. Fender, P. Roche, G. G. Pooley +4
We present results from a deep search for radio emission from the X-ray pulsar systems GX 1+4, GS 0834-430 and 4U 0115+63 which have variously been suggested to possess radio jets…
LOFT: the Large Observatory For X-ray Timing
M. Feroci, J. W. den Herder, E. Bozzo +245
The LOFT mission concept is one of four candidates selected by ESA for the M3 launch opportunity as Medium Size missions of the Cosmic Vision programme. The launch window is curren…
Outflows and spectral evolution in the eclipsing AMXP SWIFT J1749.4-2807 with NICER, XMM-Newton and NuSTAR
A. Marino, A. Anitra, S. M. Mazzola +18
The neutron star low-mass X-ray binary SWIFT J1749.4-2807 is the only known eclipsing accreting millisecond X-ray pulsar. In this manuscript we perform a spectral characterization…
Identification of a Population of X-ray Emitting Massive Stars in the Galactic Plane
G. E. Anderson, B. M. Gaensler, D. L. Kaplan +15
We present X-ray, infrared, optical and radio observations of four previously unidentified Galactic plane X-ray sources, AX J163252-4746, AX J184738-0156, AX J144701-5919 and AX J1…
The return of the bursts: Thermonuclear flashes from Circinus X-1
M. Linares, A. Watts, D. Altamirano +14
We report the detection of 15 X-ray bursts with RXTE and Swift observations of the peculiar X-ray binary Circinus X-1 during its May 2010 X-ray re-brightening. These are the first…
Solar Wind Heating Near the Sun: A Radial Evolution Approach
Yogesh, Leon Ofman, Kristopher Klein +19
Characterizing the plasma state in the near-Sun environment is essential to constrain the mechanisms that heat and accelerate the solar wind. In this study, we use Parker Solar Pro…
NuSTAR Spectroscopy of GRS 1915+105: Disk Reflection, Spin, and Connections to Jets
J. M. Miller, M. L. Parker, F. Fuerst +15
We report on the results of spectral fits made to a NuSTAR observation of the black hole GRS 1915+105 in a "plateau" state. This state is of special interest because it is similar…
The Fermi-GBM X-ray burst monitor: thermonuclear bursts from 4U 0614+09
M. Linares, V. Connaughton, P. Jenke +12
Thermonuclear bursts from slowly accreting neutron stars (NSs) have proven difficult to detect, yet they are potential probes of the thermal properties of the neutron star interior…
NICER X-ray Observations of Seven Nearby Rotation-Powered Millisecond Pulsars
S. Guillot, M. Kerr, P. S. Ray +18
NICER observed several rotation-powered millisecond pulsars to search for or confirm the presence of X-ray pulsations. When broad and sine-like, these pulsations may indicate therm…
New insights on the behaviour of solar wind protons and alphas in the Stream Interaction Region in solar cycle 23 and 24
Yogesh, D. Chakrabarty, Nandita Srivastava
Although the enhancements in the alpha-proton ratio in the solar wind (expressed as ) in the Interplanetary Coronal Mass Ejections (ICMEs) have been studied i…
Unraveling the Generation Mechanism of a Mid-Latitude Plasma Blob and the Evidence of Its Rare Interaction with a MSTID Phase Front
D. Patgiri, R. Rathi, V. Yadav +10
The paper reports observations of a nighttime mid‑latitude plasma blob and a medium‑scale traveling ionospheric disturbance (MSTID) using all‑sky airglow imaging, VTEC maps, GNSS r…
Lost and Found: A New Position and Infrared Counterpart for the X-ray Binary Scutum X-1
D. L. Kaplan, A. M. Levine, D. Chakrabarty +5
Using archival X-ray data, we find that the catalog location of the X-ray binary Scutum X-1 (Sct X-1) is incorrect, and that the correct location is that of the X-ray source AX J18…
Thermonuclear burst physics with RXTE
D. K. Galloway, D. Chakrabarty, A. Cumming +3
Recently we have made measurements of thermonuclear burst energetics and recurrence times which are unprecedented in their precision, largely thanks to the sensitivity of the Rossi…
Evolution and Consequences of Interacting CMEs of 2012 November 9-10 using STEREO/SECCHI and In Situ Observations
Wageesh Mishra, Nandita Srivastava, D. Chakrabarty
Understanding of the kinematic evolution of Coronal Mass Ejections (CMEs) in the heliosphere is important to estimate their arrival time at the Earth. It is found that kinematics o…
The Large Observatory For x-ray Timing
M. Feroci, J. W. den Herder, E. Bozzo +341
The Large Observatory For x-ray Timing (LOFT) was studied within ESA M3 Cosmic Vision framework and participated in the final down-selection for a launch slot in 2022-2024. Thanks…
The Aditya-L1 mission of ISRO
Durgesh Tripathi, D. Chakrabarty, A. Nandi +6
The Aditya-L1 is the first space-based solar observatory of the Indian Space Research Organization (ISRO). The spacecraft will carry seven payloads providing uninterrupted observat…
Optical Modulation in the X-Ray Binary 4U 1543-624 Revisited
Z. Wang, A. Tziamtzis, D. L. Kaplan +1
The X-ray binary 4U 1543624 has been provisionally identified as an ultracompact system with an orbital period of 18~min. We have carried out time-resolved optical imagi…
MAXI J1957+032: a new accreting millisecond X-ray pulsar in an ultra-compact binary
A. Sanna, P. Bult, M. NG +12
The detection of coherent X-ray pulsations at ~314 Hz (3.2 ms) classifies MAXI J1957+032 as a fast-rotating, accreting neutron star. We present the temporal and spectral analysis p…
A Search for the Near-Infrared Counterpart to GCRT J1745-3009
D. L. Kaplan, S. D. Hyman, S. Roy +5
We present an optical/near-infrared search for a counterpart to the perplexing radio transient GCRT J1745-3009, a source located ~1 degree from the Galactic Center. Motivated by so…
Changes in quasi-periodic variations of solar photospheric fields: precursor to the deep solar minimum in the cycle 23?
Susanta Kumar Bisoi, P. Janardhan, D. Chakrabarty +2
Using both wavelet and Fourier analysis, a study has been undertaken of the changes in the quasi-periodic variations in solar photospheric fields in the build-up to one of the deep…
A rare simultaneous detection of a mid-latitude plasma depleted structure in O(D) 630.0 nm and O(S) 557.7 nm all-sky airglow images on a geomagnetically quiet night
D. Patgiri, R. Rathi, V. Yadav +7
In general, nighttime thermospheric 557.7 nm emission over mid-latitudes is predominantly masked by significantly larger mesospheric component, and hence, F-region plasma structure…
A novel method to identify IMF influence over low-latitude ionosphere from the correlation of magnetic field variations at nearly antipodal stations
Sumanjit Chakraborty, D. Chakrabarty
This work is directed to explore the efficacy of strong and consistent correlations between the X component of magnetic field at two equatorial/low-latitude stations at nearly…
SWASTi-CME: A physics-based model to study CME evolution and its interaction with Solar Wind
Prateek Mayank, Bhargav Vaidya, Wageesh Mishra +1
Coronal mass ejections (CMEs) are primary drivers of space weather and studying their evolution in the inner heliosphere is vital to prepare for a timely response. Solar wind strea…
Detection of Reflection Features in the Neutron Star Low-Mass X-ray Binary Serpens X-1 with NICER
R. M. Ludlam, J. M. Miller, Z. Arzoumanian +17
We present Neutron Star Interior Composition Explorer (NICER) observations of the neutron star low-mass X-ray binary Serpens X-1 during the early mission phase in 2017. With the hi…
A NuSTAR observation of disk reflection from close to the neutron star in 4U 1608-52
N. Degenaar, J. M. Miller, D. Chakrabarty +3
Studying the reflection of X-rays off the inner edge of the accretion disk in a neutron star low-mass X-ray binary, allows us to investigate the accretion geometry and to constrain…
Simultaneous NuSTAR/Chandra observations of the Bursting Pulsar GRO J1744-28 during its third reactivation
G. Younes, C. Kouveliotou, B. W. Grefenstette +21
We report on a 10 ks simultaneous Chandra/HETG-NuSTAR observation of the Bursting Pulsar, GRO J1744-28, during its third detected outburst since discovery and after nearly 18 years…
NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar
A. Sanna, C. Ferrigno, P. S. Ray +21
We report on the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsa…
RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937
V. M. Kaspi, F. P. Gavriil, D. Chakrabarty +2
We report on long-term monitoring of the anomalous X-ray pulsar 1E 1048.1-5937 using the Rossi X-ray Timing Explorer. This pulsar's timing behavior is different from that of other…
NICER and Fermi GBM Observations of the First Galactic Ultraluminous X-ray Pulsar Swift J0243.6+6124
C. A. Wilson-Hodge, C. Malacaria, P. A. Jenke +19
Swift J0243.6+6124 is a newly discovered Galactic Be/X-ray binary, revealed in late September 2017 in a giant outburst with a peak luminosity of 2E+39 (d/7 kpc)^2 erg/s (0.1-10 keV…
An in-depth study of a neutron star accreting at low Eddington rate: On the possibility of a truncated disk and an outflow
N. Degenaar, C. Pinto, J. M. Miller +5
Due to observational challenges our knowledge of low-level accretion flows around neutron stars is limited. We present Nustar, Swift and Chandra observations of the low-mass X-ray…
The optical counterpart to SAX J1808.4-3658: observations in quiescence
L. Homer, P. A. Charles, D. Chakrabarty +1
We report the first extensive set of optical photometric observations of the counterpart to SAX J1808.4-3658 (V4580 Sagittarius) in quiescence. The source was detected at V~21, 5 m…
Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion
H. A. Krimm, C. B. Markwardt, C. J. Deloye +10
We report on the discovery by the Swift Gamma-Ray Burst Explorer of the eighth known transient accretion-powered millisecond pulsar, SWIFT J1756.9-2508, as part of routine observat…
The burst behavior of the eclipsing low-mass X-ray binary MXB 1659-298
R. Wijnands, M. P. Muno, J. M. Miller +4
We present a detailed study of the correlations between the burst properties and the inferred mass accretion rate for the X-ray transient MXB 1659-298. The bursts which exhibited o…
Changes in the X-ray Emission from the Magnetar Candidate 1E 2259+586 during its 2002 Outburst
P. M. Woods, V. M. Kaspi, C. Thompson +6
(abridged) An outburst of more than 80 individual bursts, similar to those seen from Soft Gamma Repeaters (SGRs), was detected from the Anomalous X-ray Pulsar (AXP) 1E 2259+586 in…
NICER Detection of Strong Photospheric Expansion during a Thermonuclear X-Ray Burst from 4U 1820-30
L. Keek, Z. Arzoumanian, D. Chakrabarty +13
The Neutron Star Interior Composition Explorer (NICER) on the International Space Station (ISS) observed strong photospheric expansion of the neutron star in 4U 1820-30 during a Ty…
Chandra observations of the millisecond X-ray pulsar IGR J00291+5934 in quiescence
P. G. Jonker, S. Campana, D. Steeghs +5
In this Paper we report on our analysis of three Chandra observations of the accretion-powered millisecond X-ray pulsar IGR J00291+5934 obtained during the late stages of the 2004…
The 2025 outburst of IGR J17511-3057: timing and spectral insights from NICER and NuSTAR
A. Sanna, G. K. Jaisawal, T. E. Strohmayer +13
IGR J17511-3057 was observed in a new outburst phase starting in February 2025 and lasting at least nine days. We investigated the spectral and temporal properties of IGR J17511-30…
NICER Discovers Spectral Lines During Photospheric Radius Expansion Bursts from 4U 1820-30: Evidence for Burst-driven Winds
T. E. Strohmayer, D. Altamirano, Z. Arzoumanian +14
We report the discovery with the Neutron Star Interior Composition Explorer (NICER) of narrow emission and absorption lines during photospheric radius expansion (PRE) X-ray bursts…
Upper Limits on X-ray Emission from Two Rotating Radio Transients
D. L. Kaplan, P. Esposito, S. Chatterjee +5
X-ray emission from the enigmatic Rotating RAdio Transients (RRATs) offers a vital clue to understanding these objects and how they relate to the greater neutron star population. A…
Origins of Very Low Helium Abundance Streams Detected in the Solar Wind Plasma
Yogesh, N. Gopalswamy, D. Chakrabarty +4
The abundance of helium () in the solar wind exhibits variations typically in the range from 2-5% with respect to solar cycle activity and solar wind velocity. However, the…
On the cooling tails of thermonuclear X-ray bursts: the IGR J17480-2446 link
M. Linares, D. Chakrabarty, M. van der Klis
The neutron star transient and 11 Hz X-ray pulsar IGR J17480-2446, recently discovered in the globular cluster Terzan 5, showed unprecedented bursting activity during its 2010 Octo…
A Prolonged Southward IMF-Bz Event of May 02--04, 1998: Solar, Interplanetary Causes and Geomagnetic Consequences
Susanta Kumar Bisoi, D. Chakrabarty, P. Janardhan +5
A detailed investigation was carried out to understand a prolonged (~44 hours) weakly southward interplanetary magnetic field (IMF-Bz) condition during May 02--04, 1998. In-situ ob…
A search for the optical and near-infrared counterpart of the accreting millisecond X-ray pulsar XTE J1751-305
P. G. Jonker, G. Nelemans, Z. Wang +14
We have obtained optical and near-infrared images of the field of the accreting millisecond X-ray pulsar XTE J1751-305. There are no stars in the 0.7'' error circle (0.7'' is the o…
The Orbital Period of the Ultracompact Low-Mass X-Ray Binary 4U 1543--624
Z. Wang, D. Chakrabarty
We report the discovery of the orbital period of the ultracompact low-mass X-ray binary (LMXB) 4U 1543-624 using time-resolved optical photometry taken with the 6.5-m Clay (Magella…
NICER Observes the Effects of an X-Ray Burst on the Accretion Environment in Aql X-1
L. Keek, Z. Arzoumanian, P. Bult +18
Accretion disks around neutron stars regularly undergo sudden strong irradiation by Type I X-ray bursts powered by unstable thermonuclear burning on the stellar surface. We investi…
Discovery of the accretion-powered millisecond X-ray pulsar IGR J00291+5934
D. K. Galloway, C. B. Markwardt, E. H. Morgan +2
We report on observations of the sixth accretion-powered millisecond pulsar, IGR J00291+5934, with the Rossi X-Ray Timing Explorer. The source is a faint, recurrent X-ray transient…
Evidence for the evolution and decay of an electrified Medium Scale Traveling Ionospheric Disturbances during two consecutive substorms: First results
R. Rathi, M. Sivakandan, D. Chakrabarty +3
Electrified Medium Scale Traveling Ionospheric Disturbances (EMSTIDs) is one of the prominent plasma structures that affect the propagation of high frequency radio waves. Overall,…
Global asymmetry in X variations during the 06 April 2000 geomagnetic storm: Relative roles of IMF Bz and By
Sumanjit Chakraborty, D. Chakrabarty
This investigation is directed to understand the asymmetry in X variations caused due to the relative roles played by IMF Bz and IMF By in a particular interval (22:22 - 22:55…
A holistic approach to understand Helium enrichment in Interplanetary coronal mass ejections: New insights
Yogesh, D. Chakrabarty, N. Srivastava
Despite helium abundance (AHe = nH/nHe) is ~ 8 % at the solar photospheric/chromospheric heights, AHe can be found to exceed 8% in interplanetary coronal mass ejections (ICMEs) on…
Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
D. J. K. Buisson, D. Altamirano, P. Bult +22
Swift J1858.6-0814 is a recently discovered X-ray binary notable for extremely strong variability (by factors in soft X-rays) in its discovery state. We present the detectio…
The Orbit of the High-Mass X-Ray Binary Pulsar 1E1145.1-6141
P. S. Ray, D. Chakrabarty
Observations of the 297 s X-ray pulsar 1E1145.1-6141 with the Rossi X-Ray Timing Explorer have revealed its 14.4 d eccentric orbit around its B supergiant companion. The best-fit o…
Observations of the Ultra-compact X-ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
R. M. Ludlam, L. Shishkovsky, P. M. Bult +17
We report on X-ray and radio observations of the ultra-compact X-ray binary 4U 1543-624 taken in August 2017 during an enhanced accretion episode. We obtained NICER monitoring of t…
The neutron star soft X-ray transient 1H1905+000 in quiescence
P. G. Jonker, C. G. Bassa, G. Nelemans +3
In this Paper we report on our analysis of a ~25 ksec. Chandra X-ray observation of the neutron star soft X-ray transient (SXT) 1H1905+000 in quiescence. Furthermore, we discuss ou…
An Ultraluminous X-ray Source Powered by An Accreting Neutron Star
M. Bachetti, F. A. Harrison, D. J. Walton +21
Ultraluminous X-ray sources (ULX) are off-nuclear point sources in nearby galaxies whose X-ray luminosity exceeds the theoretical maximum for spherical infall (the Eddington limit)…
A Major SGR-like Outburst and Rotation Glitch in the No-Longer-So-Anomalous X-ray Pulsar 1E 2259+586
V. M. Kaspi, F. P. Gavriil, P. M. Woods +3
We report a major outburst from the Anomalous X-ray Pulsar 1E 2259+586, in which over 80 X-ray bursts were detected in four hours using the Rossi X-ray Timing Explorer. The bursts…
Finding Novel Precursors for Solar Wind Stream Interaction Regions with Interpretable Deep Learning
Prateek Mayank, Yogesh, Enrico Camporeale +4
Solar wind stream interaction regions (SIRs) drive recurrent geomagnetic storms, yet most existing catalogs rely on expert inspection and simple thresholds that are subjective and…
Probing the effects of a thermonuclear X-ray burst on the neutron star accretion flow with NuSTAR
N. Degenaar, K. I. I. Koljonen, D. Chakrabarty +4
Observational evidence has been accumulating that thermonuclear X-ray bursts ignited on the surface of neutron stars influence the surrounding accretion flow. Here, we exploit the…
Search for continuous gravitational waves from 20 accreting millisecond X-ray pulsars in O3 LIGO data
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1634
Results are presented of searches for continuous gravitational waves from 20 accreting millisecond X-ray pulsars with accurately measured spin frequencies and orbital parameters, u…
Optical Detection of Two Intermediate Mass Binary Pulsar Companions
B. A. Jacoby, D. Chakrabarty, M. H. van Kerkwijk +2
We report the detection of probable optical counterparts for two Intermediate Mass Binary Pulsar (IMBP) systems, PSR J1528-3146 and PSR J1757-5322. Recent radio pulsar surveys have…
The USA X-ray Timing Experiment
P. S. Ray, K. S. Wood, G. Fritz +21
The USA Experiment is a new X-ray timing experiment with large collecting area and microsecond time resolution capable of conducting a broad program of studies of galactic X-ray bi…
Data Processing Software for Chandrayaan-2 Solar X-ray Monitor
N. P. S. Mithun, Santosh V. Vadawale, Arpit R. Patel +11
Solar X-ray Monitor (XSM) instrument of India's Chandrayaan-2 lunar mission carries out broadband spectroscopy of the Sun in soft X-rays. XSM, with its unique features such as low…
Accelerated Orbital Expansion And Secular Spin Down of the Accreting Millisecond Pulsar SAX J1808.4-3658
A. Patruno, P. Bult, A. Gopakumar +4
The accreting millisecond pulsar SAX J1808.4-3658 has shown a peculiar orbital evolution in the past with an orbital expansion much faster than expected from standard binary evolut…
Millihertz quasi-periodic oscillations and thermonuclear bursts from Terzan 5: A showcase of burning regimes
M. Linares, D. Altamirano, D. Chakrabarty +2
We present a comprehensive study of the thermonuclear bursts and millihertz quasi-periodic oscillations (mHz QPOs) from the neutron star (NS) transient and 11 Hz X-ray pulsar IGR J…
Periodic Thermonuclear X-ray Bursts from GS 1826-24 and the Fuel Composition as a Function of Accretion Rate
D. K. Galloway, A. Cumming, E. Kuulkers +3
We analyze 24 type I X-ray bursts from GS 1826-24 observed by the Rossi X-ray Timing Explorer between 1997 November and 2002 July. The bursts observed between 1997-98 were consiste…
Sidebands Due to Quasi-periodic Oscillations in 4U 1626-67
J. M. Kommers, D. Chakrabarty, W. H. G. Lewin
The low-mass X-ray binary pulsar 4U 1626-67 shows 0.048 Hz quasi-periodic oscillations (QPOs) and red noise variability as well as coherent pulsations at the 0.130 Hz neutron star…
Constraints on the Neutron Star and Inner Accretion Flow in Serpens X-1 Using NuSTAR
J. M. Miller, M. L. Parker, F. Fuerst +17
We report on an observation of the neutron star low-mass X-ray binary Serpens X-1, made with NuSTAR. The extraordinary sensitivity afforded by NuSTAR facilitated the detection of a…
A decade of timing an accretion-powered millisecond pulsar: The continuing spin down and orbital evolution of SAX J1808.4-3658
J. M. Hartman, A. Patruno, D. Chakrabarty +4
The Rossi X-ray Timing Explorer has observed five outbursts from the transient 2.5 ms accretion-powered pulsar SAX J1808.4-3658 during 1998-2008. We present a pulse timing study of…
A Glitch in an Anomalous X-ray Pulsar
V. M. Kaspi, J. R. Lackey, D. Chakrabarty
We report the detection of a sudden spin-up of the 11 s anomalous X-ray pulsar 1RXS J170849.0-4000910 in regular timing observations made with the Rossi X-ray Timing Explorer. The…
SWASTi-SW: Space Weather Adaptive SimulaTion framework for Solar Wind and its relevance to ADITYA-L1 mission
Prateek Mayank, Bhargav Vaidya, D. Chakrabarty
Solar wind streams, acting as background, govern the propagation of space weather drivers in the heliosphere, which induce geomagnetic storm activities. Therefore, predictions of t…
Radius Constraints from Reflection Modeling of Cygnus X-2 with NuSTAR and NICER
R. M. Ludlam, E. M. Cackett, J. A. GarcÃa +8
We present a spectral analysis of NuSTAR and NICER observations of the luminous, persistently accreting neutron star (NS) low-mass X-ray binary Cygnus X-2. The data were divided in…
Probing spin dynamics of 2D excitons with twisted light
A. K. Pattanayak, P. Das, D. Chakrabarty +5
We propose a mechanism of intravalley spin-flip scattering in spin-valley coupled two dimensional systems by transferring momentum of light into exciton center of mass using optica…
Interplanetary and Geomagnetic Consequences of Interacting CMEs of 13-14 June 2012
Nandita Srivastava, Wageesh Mishra, D. Chakrabarty
We report on the kinematics of two interacting CMEs observed on 13 and 14 June 2012. Both CMEs originated from the same active region NOAA 11504. After their launches which were se…
XMM-Newton Spectroscopy of the Accretion-Driven Millisecond X-ray Pulsar XTE J1751-305 in Outburst
J. M. Miller, R. Wijnands, M. Mendez +6
We present an analysis of the first high-resolution spectra measured from an accretion-driven millisecond X-ray pulsar in outburst. We observed XTE J1751-305 with XMM-Newton on 200…
The very-faint X-ray binary IGR J17062-6143: a truncated disk, no pulsations and a possible outflow
J. van den Eijnden, N. Degenaar, C. Pinto +10
We present a comprehensive X-ray study of the neutron star low-mass X-ray binary IGR J17062-6143, which has been accreting at low luminosities since its discovery in . Analys…
A strongly changing accretion morphology during the outburst decay of the neutron star X-ray binary 4U 1608-52
J. van den Eijnden, N. Degenaar, R. M. Ludlam +7
It is commonly assumed that the properties and geometry of the accretion flow in transient low-mass X-ray binaries (LMXBs) significantly change when the X-ray luminosity decays bel…
Chasing the Identification of ASCA Galactic Objects (ChIcAGO) - An X-ray Survey of Unidentified Sources in the Galactic Plane I: Source Sample and Initial Results
G. E. Anderson, B. M. Gaensler, D. L. Kaplan +18
We present the Chasing the Identification of ASCA Galactic Objects (ChIcAGO) survey, which is designed to identify the unknown X-ray sources discovered during the ASCA Galactic Pla…
A Soft X-Ray Spectral Episode for the Clocked Burster, GS 1826-24 as Measured by Swift and NuSTAR
J. Chenevez, D. K. Galloway, J. J. M. in 't Zand +12
We report on NuSTAR and Swift observations of a soft state of the neutron star low-mass X-ray binary GS 1826-24, commonly known as the "clocked" burster. The transition to the soft…
Simultaneous NICER and NuSTAR Observations of the Ultra-compact X-ray Binary 4U 1543-624
R. M. Ludlam, A. D. Jaodand, J. A. GarcÃa +8
We present the first joint NuSTAR and NICER observations of the ultra-compact X-ray binary (UCXB) 4U 1543624 obtained in 2020 April. The source was at a luminosity of $L_{0.5-50…
EXIST: A High Sensitivity Hard X-ray Imaging Sky Survey Mission for ISS
J. Grindlay, L. Bildsten, D. Chakrabarty +12
A deep all-sky imaging hard x-ray survey and wide-field monitor is needed to extend soft (ROSAT) and medium (ABRIXAS2) x-ray surveys into the 10-100 keV band (and beyond) at compar…