Search Publications
Rapid radio flaring during an anomalous outburst of SS Cyg
Miller-Jones, J. C. A.; Fender, R. P.; Mooley, K. P. +12 more
The connection between accretion and jet production in accreting white dwarf binary systems, especially dwarf novae, is not well understood. Radio wavelengths provide key insights into the mechanisms responsible for accelerating electrons, including jets and outflows. Here, we present densely sampled radio coverage, obtained with the Arcminute Mic…
Detection of faint broad emission lines in type 2 AGN - I. Near-infrared observations and spectral fitting
Maiolino, R.; Fiore, F.; Bianchi, S. +8 more
We present medium resolution near-infrared spectroscopic observations of 41 obscured and intermediate class active galactic nuclei (AGN; type 2, 1.9 and 1.8; AGN2) with redshift z ≲ 0.1, selected from the Swift/Burst Alert Telescope 70-month catalogue. The observations have been carried out in the framework of a systematic study of the AGN2 near-i…
IFU spectroscopy of southern planetary nebulae IV: a physical model for IC 418
Ali, A.; Dopita, M. A.; Sutherland, R. S. +2 more
We describe high spectral resolution, high dynamic range integral field spectroscopy of IC 418 covering the spectral range 3300-8950 Å and compare with earlier data. We determine line fluxes, derive chemical abundances, provide a spectrum of the central star and determine the shape of the nebular continuum. Using photoionization models, we derive …
A three-dimensional modelling of the layered structure of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +53 more
We provide a three-dimensional model of the inner layered structure of comet 67P based on the hypothesis of an extended layering independently wrapping each lobe. A large set of terrace orientations was collected on the latest shape model and then used as a proxy for the local orientation of the surfaces of discontinuity which defines the layers. …
B fields in OB stars (BOB): The magnetic triple stellar system HD 164492C in the Trifid nebula
Ilyin, I.; Järvinen, S.; González, J. F. +15 more
HD 164492C is a spectroscopic triple stellar system that has been recently detected to possess a strong magnetic field. We have obtained high-resolution spectroscopic and spectropolarimetric observations over a time span of two years and derived physical, chemical and magnetic properties for this object. The system is formed by an eccentric close …
AX J1910.7+0917: the slowest X-ray pulsar
Sidoli, L.; Esposito, P.; Israel, G. L. +2 more
Pulsations from the high-mass X-ray binary AX J1910.7+0917 were discovered during Chandra observations performed in 2011. We report here more details on this discovery and discuss the source nature. The period of the X-ray signal is P = 36200 ± 110 s, with a pulsed fraction, PF, of 63 ± 4 per cent. Given the association with a massive B-type compa…
Indication of a massive circumbinary planet orbiting the low-mass X-ray binary MXB 1658-298
Paul, Biswajit; Jain, Chetana; Dutta, Anjan +2 more
We present an X-ray timing analysis of the transient X-ray binary MXB 1658-298, using data obtained from the RXTE and XMM-Newton observatories. We have made 27 new mid-eclipse time measurements from observations made during the two outbursts of the source. These new measurements have been combined with the previously known values to study long-ter…
Investigating the physical properties of outbursts on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +46 more
Cometary outbursts on several comets have been observed both by ground-based telescopes and by in situ instruments on spacecraft. However, the mechanism behind these phenomena and their physical properties are still unclear. The optical, spectrocopic and infrared remote imaging system (OSIRIS) onboard the Rosetta spacecraft provided first-hand inf…
Hubble Space Telescope astrometry of the closest brown dwarf binary system - I. Overview and improved orbit★
Apai, D.; Pourbaix, D.; Bedin, L. R. +4 more
Located at 2 pc, the L7.5+T0.5 dwarfs system WISE J104915.57-531906.1 (Luhman 16 AB) is the third closest system known to Earth, making it a key benchmark for detailed investigation of brown dwarf atmospheric properties, thermal evolution, multiplicity, and planet-hosting frequency. In the first study of this series - based on a multicycle Hubble …
Discovery of carbon-rich Miras in the Galactic bulge
Matsunaga, Noriyuki; Whitelock, Patricia A.; Aydi, Elias +4 more
Only one carbon-rich (C-rich, hereinafter) Mira variable has so far been suggested as a member of the Galactic bulge and this is in a symbiotic system. Here we describe a method for selecting C-rich candidates from an infrared colour-colour diagram, (J - Ks) versus ([9] - [18]). Follow-up low-resolution spectroscopy resulted in the dete…