Search Publications
Comparing lensing and stellar orbital models of a nearby massive strong-lens galaxy
Smith, Russell J.; Poci, Adriano
Exploiting the relative proximity of the nearby strong-lens galaxy SNL-1, we present a critical comparison of the mass estimates derived from independent modelling techniques. We fit triaxial orbit-superposition dynamical models to spatially resolved stellar kinematics, and compare to the constraints derived from lens modelling of high-resolution …
Revisiting a detached stellar structure in the outer north-eastern region of the Small Magellanic Cloud
Piatti, Andrés E.
The outer north-eastern region of the Small Magellanic Cloud (SMC) is populated by a shell-like overdensity whose nature was recently investigated. We analysed 20 catalogued star clusters projected on to it from Survey of the MAgellanic Stellar History data sets. After carrying out a cleaning of field stars in the star cluster colour-magnitude dia…
A Radio-selected Population of Dark, Long Gamma-Ray Bursts: Comparison to the Long Gamma-Ray Burst Population and Implications for Host Dust Distributions
Kilpatrick, Charles D.; Andrews, Jennifer; Miller, Adam A. +17 more
We present centimeter-band and millimeter-band afterglow observations of five long-duration γ-ray bursts (GRBs; GRB 130131A, 130420B, 130609A, 131229A, 140713A) with dust-obscured optical afterglow emission, known as "dark" GRBs. We detect the radio afterglow of two of the dark GRBs (GRB 130131A and 140713A), along with a tentative detection of a …
High-resolution ALMA and HST imaging of κCrB: a broad debris disc around a post-main-sequence star with low-mass companions
Wyatt, M. C.; Bonsor, A.; Marino, S. +6 more
$\kappa \,$ CrB is an ~2.5 Gyr old K1 sub-giant star, with an eccentric exo-Jupiter at ~2.8 au and a debris disc at tens of au. We present ALMA (Atacama Large Millimetre/submillimetre Array) Band 6 (1.3 mm) and Hubble Space Telescope scattered light (0.6$\, \mu$m) images, demonstrating $\kappa \,$CrB's broad debris disc, covering an extent $50\!-\…
The first study of four doubly eclipsing systems
Zasche, P.; Henzl, Z.; Kára, J.
We present the discovery and the very first analysis of four stellar systems showing two periods of eclipses, that are the objects classified as doubly eclipsing systems. Some of them were proved to orbit each other thanks to their eclipse-timing-variations (ETVs) of both pairs, hence they really constitute rare quadruples with two eclipsing pairs…
X-Ray Observations of the Isolated Black Hole Candidate OGLE-2011-BLG-0462 and Other Collapsed Objects Discovered through Gravitational Microlensing
Mereghetti, S.; Ponti, G.; Sidoli, L. +1 more
Isolated black holes and neutron stars can be revealed through the observation of long-duration gravitational microlensing events. A few candidates have been found in surveys of stars in the direction of the Galactic bulge. Recently, thanks to the addition of astrometric information at milliarcsecond level, it has been possible to reduce the uncer…
Discovering vanishing objects in POSS I red images using the Virtual Observatory
Rodrigo, C.; Solano, Enrique; Villarroel, B.
In this paper, we report a search for vanishing sources in POSS I red images using virtual observatory (VO) archives, tools, and services. The search, conducted in the framework of the VASCO project, aims at finding POSS I (red) sources not present in recent catalogues like Pan-STARRS DR2 (limiting magnitude r = 21.4) or Gaia EDR3 (limiting magnit…
Surface brightness-colour relations of dwarf stars from detached eclipsing binaries. I. Calibrating sample
Kervella, P.; Maxted, P. F. L.; Southworth, J. +19 more
Aims: Surface brightness - colour relations (SBCRs) are very useful tools for predicting the angular diameters of stars. They offer the possibility to calculate very precise spectrophotometric distances by the eclipsing binary method or the Baade-Wesselink method. Double-lined Detached Eclipsing Binary stars (SB2 DEBs) with precisely known tr…
Evidence of Alfvén Waves Generated by Mode Coupling in the Magnetotail Lobe
Zhang, Tielong; Sun, Jicheng; Wang, Guoqiang +2 more
Mode coupling is an important mechanism to excite Alfvén waves and has been extensively investigated based on numerical simulations. However, no direct observational evidence has been found regarding to this mechanism in the magnetotail lobe. Here, we report an in-situ observation that an Alfvén wave with a period of several minutes is clearly rel…
Radiation from cold molecular clouds and Sun chromosphere produced by antiquark nugget dark matter
Flambaum, V. V.; Samsonov, I. B.
We study the astrophysical implications of the quark nugget model of dark matter and propose observational techniques for detecting antiquark nuggets (anti-QNs) with modern telescopes. Anti-QNs are compact composite objects of antiquark matter with a typical radius R ∼10-5 cm and density exceeding that of nuclear matter. Atoms and molec…