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Two sides of the same spin: tracking optical and radio pulsations of SAX J1808.4-3658 from outburst to quiescence
C. Ballocco, A. Miraval Zanon, A. Papitto +25
High-time-resolution optical and UV observations have revealed bright coherent pulsations from accreting millisecond pulsars, exceeding the luminosity expected from thermal emissio…
4U 1624-490 as a possible intermediate-mass X-ray binary: constraints from XRISM and NuSTAR spectroscopy
R. Iaria, A. Anitra, T. Di Salvo +7
High-inclination dipping neutron-star X-ray binaries provide a direct view of accretion-flow structure because the line of sight intercepts ionised plasma above the disc. We analys…
Localisation of gamma-ray bursts from the combined SpIRIT+HERMES-TP/SP nano-satellite constellation
Matt Thomas, Michele Trenti, Riccardo Campana +24
Multi-messenger observations of the transient sky to detect cosmic explosions and counterparts of gravitational wave mergers critically rely on orbiting wide-FoV telescopes to cove…
Spectral analysis of the AMXP IGR J17591-2342 during its 2018 outburst
A. Manca, A. F. Gambino, A. Sanna +9
The Accreting Millisecond X-ray Pulsar IGR J17591-2342 is a LMXB system that went in outburst on August 2018 and it was monitored by the NICER observatory and partially by other fa…
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…
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…
On the peculiar long-term orbital evolution of the eclipsing accreting millisecond X-ray pulsar SWIFT J1749.4-2807
A. Sanna, L. Burderi, T. Di Salvo +15
We present the pulsar timing analysis of the accreting millisecond X-ray pulsar SWIFT J1749.4-2807 monitored by NICER and XMM-Newton during its latest outburst after almost eleven…
Optical pulsations from a transitional millisecond pulsar
F. Ambrosino, A. Papitto, L. Stella +8
Weakly magnetic, millisecond spinning neutron stars attain their very fast rotation through a 1E8-1E9 yr long phase during which they undergo disk-accretion of matter from a low ma…
An XMM-Newton and INTEGRAL view on the hard state of EXO 1745-248 during its 2015 outburst
M. Matranga, A. Papitto, T. Di Salvo +10
CONTEXT - Transient low-mass X-ray binaries (LMXBs) often show outbursts lasting typically a few-weeks and characterized by a high X-ray luminosity (…
A possible solution of the puzzling variation of the orbital period of MXB 1659-298
R. Iaria, A. F. Gambino, T. Di Salvo +6
MXB 1659-298 is a transient neutron star Low-Mass X-ray binary system that shows eclipses with a periodicity of 7.1 hr. The source went to outburst in August 2015 after 14 years of…
The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence
M. C. Baglio, S. Campana, P. D'Avanzo +6
We present an optical (gri) study during quiescence of the accreting millisecond X-ray pulsar IGR J00291+5934 performed with the 10.4m Gran Telescopio Canarias (GTC) in August 2014…
A re-analysis of the NuSTAR and XMM-Newton broad-band spectrum of Ser~X-1
M. Matranga, T. Di Salvo, R. Iaria +4
Context: Ser X-1 is a well studied LMXB which clearly shows a broad iron line. Recently, Miller et al. (2103) have presented broad-band, high quality NuSTAR data of SerX-1.Using re…
Discovery of a soft X-ray 8 mHz QPO from the accreting millisecond pulsar IGR J00291+5934
C. Ferrigno, E. Bozzo, A. Sanna +7
In this paper, we report on the analysis of the peculiar X-ray variability displayed by the accreting millisecond X-ray pulsar IGR J00291+5934 in a 80 ks-long joint NuSTAR and XMM-…
Study of the reflection spectrum of the LMXB 4U 1702-429
R. Iaria, T. Di Salvo, M. Del Santo +7
The source 4U 1702-429 (Ara X-1) is a low-mass X-ray binary system hosting a neutron star. Albeit the source is quite bright ( erg s) its broadband spectrum ha…
SAX J1808.4-3658, an accreting millisecond pulsar shining in gamma rays?
E. de Ona Wilhelmi, A. Papitto, J. Li +7
We report the detection of a possible gamma-ray counterpart of the accreting millisecond pulsar SAX J1808.4-3658. The analysis of ~6 years of data from the Large Area Telescope on…
Signature of the presence of a third body orbiting around XB 1916-053
R. Iaria, T. Di Salvo, A. F. Gambino +9
The ultra-compact dipping source \object{XB 1916-053} has an orbital period of close to 50 min and a companion star with a very low mass (less than 0.1 M). The orbital pe…
Testing Rate Dependent corrections on timing mode EPIC-pn spectra of the accreting Neutron Star GX 13+1
F. Pintore, A. Sanna, T. di Salvo +6
When the EPIC-pn instrument on board XMM-Newton is operated in Timing mode, high count rates (>100 cts/s) of bright sources may affect the calibration of the energy scale, resultin…
Chandra X-ray spectroscopy of a clear dip in GX 13+1
A. D'Aì, R. Iaria, T. Di Salvo +3
The source GX 13+1 is a persistent, bright Galactic X-ray binary hosting an accreting neutron star. It shows highly ionized absorption features, with a blueshift of 400 km s…
Discovery of periodic dips in the light curve of GX 13+1: the X-ray orbital ephemeris of the source
R. Iaria, T. Di Salvo, L. Burderi +3
The bright low-mass X-ray binary (LMXB) GX 13+1 is one of the most peculiar Galactic binary systems. A periodicity of 24.27 d with a formal statistical error of 0.03 d was observed…
Swings between rotation and accretion power in a millisecond binary pulsar
A. Papitto, C. Ferrigno, E. Bozzo +20
It is thought that neutron stars in low-mass binary systems can accrete matter and angular momentum from the companion star and be spun-up to millisecond rotational periods. During…
Testing reflection features in 4U 1705-44 with XMM-Newton, BeppoSAX and RXTE in the hard and soft state
E. Egron, T. Di Salvo, S. Motta +10
We use data of the bright atoll source 4U 1705-44 taken with XMM-Newton, BeppoSAX and RXTE both in the hard and in the soft state to perform a self-consistent study of the reflecti…
X-ray spectroscopy of the ADC source X1822-371 with Chandra and XMM-Newton
R. Iaria, T. Di Salvo, A. D'Aì +5
The eclipsing low-mass X-ray binary X1822-371 is the prototype of the accretion disc corona (ADC) sources. We analyse two Chandra observations and one XMM-Newton observation to stu…
Subarcsecond location of IGR J17480-2446 with Rossi XTE
A. Riggio, L. Burderi, T. Di Salvo +10
On 2010 October 13, the X-ray astronomical satellite Rossi XTE, during the observation of the newly discovered accretion powered X-ray pulsar IGR J17480--2446, detected a lunar occ…
A relativistic iron emission line from the neutron star low-mass X-ray binary GX 3+1
S. Piraino, A. Santangelo, P. Kaaret +7
We present the results of a spectroscopic study of the Fe Kα emission of the persistent neutron-star atoll low-mass X-ray binary and type I X-ray burster GX 3+1 with the EPIC-PN on…