Search Publications
A new method for target selection in direct imaging programmes with COPAINS
Bonavita, M.; Biller, B.; Fontanive, C. +2 more
We present COPAINS (Code for Orbital Parametrization of Astrometrically Inferred New Systems), an innovative tool developed to identify previously undiscovered companions detectable via direct imaging, based on changes in stellar proper motions across multiple astrometric catalogues. This powerful procedure allows for dynamical predictions of the …
An automated search for transiting exocomets
Wyatt, Mark C.; Hodgkin, Simon T.; Kennedy, Grant M. +1 more
This paper discusses an algorithm for detecting single transits in photometric time-series data. Specifically, we aim to identify asymmetric transits with ingress that is more rapid than egress, as expected for cometary bodies with a significant tail. The algorithm is automated, so can be applied to large samples and only a relatively small number…
SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
Komossa, S.; Yuan, Weimin; Yi, Weimin +4 more
As hybrids of narrow-line Seyfert 1 (NLS1) galaxies and blazars, γ-ray emitting NLS1s are important probes of jet physics in the high Eddington-ratio regime. Only very few of them are known to date; the majority of them below redshift z = 0.5. Here, we present the identification of the γ-ray emitting AGN TXS 0943+105 (SDSS J094635.06+101706.1) as …
New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts, and much more
Segreto, A.; Ferrigno, C.; Malzac, J. +7 more
1RXS J180408.9-342058 is a low-mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddington luminosity. In this work, we present a comprehensive X-ray study of this source using data from the Neil Gehrels Swift Observatory, NuSTAR, and INTEGRAL/JEM-X. In orde…
Magnetic topologies of young suns: the weak-line T Tauri stars TWA 6 and TWA 8A
Donati, J. -F.; Alencar, S. H. P.; Hussain, G. A. J. +5 more
We present a spectropolarimetric study of two weak-line T Tauri stars (wTTSs), TWA 6, and TWA 8A, as part of the MaTYSSE (Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets) programme. Both stars display significant Zeeman signatures that we have modelled using Zeeman Doppler Imaging (ZDI). The magnetic field of TWA 6…
Isochrone fitting of Galactic globular clusters - I. NGC 5904
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu
We present new isochrone fits to colour-magnitude diagrams of the Galactic globular cluster NGC 5904 (M5). We utilize 29 photometric bands from the ultraviolet to mid-infrared by the use of the data from the Hubble Space Telescope, Gaia DR2, Wide-field Infrared Survey Explorer, Sloan Digital Sky Survey (SDSS), and other photometric data. In our is…
Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - IV. Evidence for multiple populations in Hodge 11 and NGC 2210
Ventura, Paolo; Cohen, Roger E.; Sarajedini, Ata +10 more
We present a multiple population search in two old Large Magellanic Cloud (LMC) Globular clusters, Hodge 11 and NGC 2210. This work uses data from the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope from programme GO-14164 in Cycle 23. Both of these clusters exhibit a broadened main sequence with the second popula…
High-velocity string of knots in the outburst of the planetary nebula Hb4
Boumis, P.; Derlopa, S.; Akras, S. +1 more
The bipolar collimated outflows of the Hb4 planetary nebula (PN) exhibit an evident decrease in their expansion velocity with respect to the distance from the central star. So far, similar velocity law has also been found in Herbig-Haro objects. The interpretation of this peculiar velocity law and the classification of the outflows is the main foc…
AGN photoionization of gas in companion galaxies as a probe of AGN radiation in time and direction
Schawinski, Kevin; Keel, William C.; Moiseev, Alexei V. +9 more
We consider AGN photoionization of gas in companion galaxies (cross-ionization) as a way to sample the intensity of AGN radiation in both direction and time, independent of the gas properties of the AGN host galaxies. From an initial set of 212 AGN+companion systems, identified with the help of Galaxy Zoo participants, we obtained long-slit optica…
Variability studies and modelling of the blazar PKS 2155-304 in the light of a decade of multi-wavelength observations
Serpico, P. D.; Lenain, J. -P.; Maurin, G. +2 more
The variability of the high-frequency peaked BL Lac object PKS 2155-304 is studied using almost 10 years of optical, X-ray and γ-ray data. Publicly available data have been gathered and analysed with the aim to characterize the variability and to search for lognormality or periodic behaviour. The optical and X-ray range follow a lognormal process;…