Search Publications
Detection of 2-4 GHz Continuum Emission from ɛ Eridani
Hallinan, G.; Chatterjee, S.; Cordes, J. M. +2 more
The nearby star ɛ Eridani has been a frequent target of radio surveys for stellar emission and extraterrestrial intelligence. Using deep 2-4 GHz observations with the Very Large Array, we have uncovered a 29 µJy compact, steady continuum radio source coincident with ɛ Eridani to within 0"06 (≲2σ; 0.2 au at the distance of the star). Combinin…
The inner view of NGC 1052 using multiple X-ray observations
Papadakis, I. E.; Osorio-Clavijo, N.; González-Martín, O. +2 more
In this paper, we present a multi-epoch analysis of NGC 1052, a prototypical low-luminisity active galactic nucleus, using XMM-Newton, Suzaku and NuSTAR observations taken from 2001 to 2017. This is the first time that results from NuSTAR observations have been reported for NGC 1052. Regarding technical aspects, we found a wavelength-dependent cal…
Physical parameters of selected Gaia mass asteroids
Geier, S.; Pál, A.; Molnár, L. +36 more
Context. Thanks to the Gaia mission, it will be possible to determine the masses of approximately hundreds of large main belt asteroids with very good precision. We currently have diameter estimates for all of them that can be used to compute their volume and hence their density. However, some of those diameters are still based on simple thermal m…
Monitoring clumpy wind accretion in supergiant fast-X-ray transients with XMM-Newton
Romano, P.; Ferrigno, C.; Bozzo, E.
Supergiant fast-X-ray transients (SFXTs) are a sub-class of supergiant high-mass X-ray binaries hosting a neutron star accreting from the stellar wind of a massive OB companion. Compared to the classical systems, SFXTs display a pronounced variability in X-rays that has long been (at least partly) ascribed to the presence of clumps in the stellar …
Timing of the accreting millisecond pulsar IGR J17591-2342: evidence of spin-down during accretion
Sanna, A.; Ray, P. S.; Di Salvo, T. +8 more
We report on the phase-coherent timing analysis of the accreting millisecond X-ray pulsar IGR J17591-2342, using Neutron Star Interior Composition Explorer (NICER) data taken during the outburst of the source between 2018 August 15 and 2018 October 17. We obtain an updated orbital solution of the binary system. We investigate the evolution of the …
NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system
Jackman, James A. G.; Wheatley, Peter J.; Bayliss, Daniel +23 more
We present the discovery of NGTS J214358.5-380102, an eccentric M-dwarf binary discovered by the Next-Generation Transit Survey (NGTS). The system period of 7.618 d is greater than many known eclipsing M-dwarf binary systems. Its orbital eccentricity of $0.323^{+0.0014}_{-0.0037}$ is large relative to the period and semimajor axis of the binary. G…
Chasing candidate Supergiant Fast X-ray Transients in the 1000 orbits INTEGRAL/IBIS catalogue
Sidoli, L.; Bird, A. J.; Bazzano, A. +2 more
We report results from an investigation at hard X-rays (above 18 keV) and soft X-rays (below 10 keV) of a sample of X-ray transients located on the Galactic plane and detected with the bursticity method, as reported in the latest 1000 orbits INTEGRAL/IBIS catalogue. Our main aim has been to individuate those with X-rays characteristics strongly re…
LoCuSS: exploring the connection between local environment, star formation, and dust mass in Abell 1758
Finoguenov, A.; Smith, G. P.; Egami, E. +3 more
We explore the connection between dust and star formation, in the context of environmental effects on galaxy evolution. In particular, we exploit the susceptibility of dust to external processes to assess the influence of dense environment on star-forming galaxies. We have selected cluster Abell 1758 from the Local Cluster Substructure Survey (LoC…
Extensive Study of a Coronal Mass Ejection with UV and White-light Coronagraphs: The Need for Multiwavelength Observations
Feng, Li; Lu, Lei; Gan, Weiqun +3 more
Coronal mass ejections (CMEs) often show different features in different bandpasses. By combining data in white-light (WL) and ultraviolet (UV) bands, we have applied different techniques to derive plasma temperatures, electron density, internal radial speed, and so on, within a fast CME. They serve as extensive tests of the diagnostic capabilitie…
The closest extremely low-mass white dwarf to the Sun
Vennes, Stéphane; Simpson, Jeffrey D.; Marino, Anna F. +4 more
We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ≈ 71 pc) extremely low-mass white dwarf to the Sun. We find that this star is hydrogen rich with $T_\textrm {eff}\approx 10\, 500$ K, log g ≈ 5.9, and, following evolutionary models, has a mass of ≈0.17 M⊙. Independent analysis of radial …