Search Publications
A fresh perspective on the 3D dynamics of Tycho's supernova remnant: Ejecta asymmetries in the X-ray band
Ballet, J.; Decourchelle, A.; Acero, F. +1 more
Context. Even 450 yr after the explosion of the Type Ia SN 1572, the dynamics of the Tycho supernova remnant (Tycho's SNR) can offer keys to improving our understanding of the explosion mechanism and the interaction of the remnant with the interstellar medium.
Aims: To probe the asymmetries and the evolution of the SNR, we tracked the ejecta …
Revealing the structure of the lensed quasar Q 0957+561. III. Constraints on the size of the broad-line region
Hanslmeier, A.; Muñoz, J. A.; Mediavilla, E. +6 more
Aims: Our aim is to examine the size, kinematics, and geometry of the broad-line region (BLR) in the double-lensed quasar Q 0957+561 by analyzing the impact of microlensing on various rest-frame ultraviolet broad-emission lines (BELs).
Methods: We explore the influence of intrinsic variability and microlensing on the C IV, C III], and Mg…
Acceleration of suprathermal protons near an interplanetary shock
Wang, L.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +12 more
Context. Interplanetary collisionless shocks are known to be sources of energetic charged particles up to hundreds of MeV. However, the underlying acceleration mechanisms are still under debate.
Aims: We determine the properties of suprathermal protons accelerated by the interplanetary shock on 2021 November 3 with the unprecedented high-reso…
Transition disc nature of post-AGB binary systems confirmed by mid-infrared interferometry
Cuello, N.; Mérand, A.; Van Winckel, H. +4 more
Context. Many properties of circumbinary discs around evolved post-asymptotic giant branch (post-AGB) binary systems are similar to those of protoplanetary discs around young stars. The deficits of near-infrared (near-IR) flux in the spectral energy distributions (SEDs) of these systems hints towards large dust-free cavities that are reminiscent o…
JOYS: Disentangling the warm and cold material in the high-mass IRAS 23385+6053 cluster
Östlin, G.; Güdel, M.; Ray, T. P. +20 more
Context. High-mass star formation occurs in a clustered mode where fragmentation is observed from an early stage onward. Young protostars can now be studied in great detail with the recently launched James Webb Space Telescope (JWST).
Aims: We study and compare the warm (>100 K) and cold (<100 K) material toward the high-mass star-formi…
A Gaia astrometric view of the open clusters Pleiades, Praesepe, and Blanco 1
García-Varela, Alejandro; Alfonso, Jeison
Context. Nearby open clusters, such as Pleiades, Praesepe, and Blanco 1, have been extensively studied due to their proximity to the Sun. The Gaia data provide the opportunity to investigate these clusters, because they contain valuable astrometric and photometric information that can be used to update their kinematic and stellar properties.
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New X-ray detections of magnetic period-bounce cataclysmic variables from XMM-Newton and SRG/eROSITA
Stelzer, Beate; Schwope, Axel; de Martino, Domitilla +1 more
Context. A great portion of the cataclysmic variable population, between 40% and 70%, is predicted to be made up of period-bouncers, systems with degenerate donors that have evolved past the period minimum. However, due to their intrinsic faintness, only a few of these systems have been observed and confidently identified so far.
Aims: We hav…
Tidally locked rotation of the dwarf planet (136199) Eris discovered via long-term ground-based and space photometry
Greiner, J.; Pál, A.; Marton, G. +9 more
The rotational states of the members in the dwarf planet-satellite systems in the trans-Neptunian region are determined by formation conditions and the tidal interaction between the components. These rotational characteristics serve as prime tracers of their evolution. A number of authors have claimed a very broad range of values for the rotation …
Panning for gold, but finding helium: Discovery of the ultra-stripped supernova SN 2019wxt from gravitational-wave follow-up observations
Beswick, R.; Covino, S.; D'Avanzo, P. +101 more
We present the results from multi-wavelength observations of a transient discovered during an intensive follow-up campaign of S191213g, a gravitational wave (GW) event reported by the LIGO-Virgo Collaboration as a possible binary neutron star merger in a low latency search. This search yielded SN 2019wxt, a young transient in a galaxy whose sky po…
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
Hamann, W. -R.; Oey, M. S.; Mehner, A. +16 more
Context. The origin of the observed population of Wolf-Rayet (WR) stars in low-metallicity galaxies, such as the Small Magellanic Cloud (SMC), is not yet understood. Standard, single-star evolutionary models predict that WR stars should stem from very massive O-type star progenitors, but these are very rare. On the other hand, binary evolutionary …