Search Publications
Planetary system architectures with low-mass inner planets. Direct imaging exploration of mature systems beyond 1 au
Henning, Th.; Babusiaux, C.; Messina, S. +20 more
Context. The discovery of planets orbiting at less than 1 au from their host star and less massive than Saturn in various exoplanetary systems revolutionized our theories of planetary formation. The fundamental question is whether these close-in low-mass planets could have formed in the inner disk interior to 1 au, or whether they formed further o…
Exploring the internal rotation of the extremely low-mass He-core white dwarf GD 278 with TESS asteroseismology
Córsico, Alejandro H.; Hermes, J. J.; Althaus, Leandro G. +2 more
Context. The advent of high-quality space-based photometry, brought about by missions such as Kepler/K2 and TESS, makes it possible to unveil the fundamental parameters and properties of the interiors of white dwarf stars, particularly extremely low-mass white dwarfs, using the tools of asteroseismology.
Aims: We present an exploration of the…
Intensity contrast of solar network and faculae close to the solar limb, observed from two vantage points
Schmidt, W.; Woch, J.; Solanki, S. K. +44 more
Context. The brightness of faculae and network depends on the angle at which they are observed and the magnetic flux density. Close to the limb, the assessment of this relationship has until now been hindered by the increasingly lower signal in magnetograms.
Aims: This preliminary study aims to highlight the potential of using simultaneous ob…
Beyond small-scale transients: A closer look at the diffuse quiet solar corona
Peter, H.; Chitta, L. P.; Solanki, S. K. +9 more
Aims: Within the quiet Sun corona imaged at 1 MK, much of the field of view consists of diffuse emission that appears to lack the spatial structuring that is so evident in coronal loops or bright points. Our aim is to determine if these diffuse regions are categorically different in terms of their intensity fluctuations and spatial configurat…
XMM-Newton observation of V1504 Cyg as a probe for the existence of an evaporated corona
Ness, J. -U.; Dobrotka, A.; Nucita, A. A. +1 more
Aims: We present an analysis of an XMM-Newton observation of the dwarf nova V1504 Cyg during the decline from an outburst. Our goal is to search for evidence of an evaporated X-ray corona. Such a corona can be understood as an optically thin and geometrically thick disc around the central part of an optically thick and geometrically thin disc…
LeMMINGs. V. Nuclear activity and bulge properties: A detailed multi-component decomposition of e-MERLIN Palomar galaxies with HST
Argo, M. K.; Gallagher, J. S.; Knapen, J. H. +12 more
We used high-resolution HST imaging and e-MERLIN 1.5-GHz observations of galaxy cores from the LeMMINGs survey to investigate the relation between optical structural properties and nuclear radio emission for a large sample of galaxies. We performed accurate, multi-component decompositions of new surface brightness profiles extracted from HST image…
Diffuse solar coronal features and their spicular footpoints
Peter, H.; Chitta, L. P.; Milanović, N.
Context. In addition to a component of the emission that originates from clearly distinguishable coronal loops, the solar corona also exhibits extreme-ultraviolet (EUV) and X-ray ambient emission that is rather diffuse and is often considered undesirable background. Importantly, unlike the generally more structured transition region and chromosphe…
A multi-band AGN-SFG classifier for extragalactic radio surveys using machine learning
Wang, L.; Vaccari, M.; Morganti, R. +7 more
Context. Extragalactic radio continuum surveys play an increasingly more important role in galaxy evolution and cosmology studies. While radio galaxies and radio quasars dominate at the bright end, star-forming galaxies (SFGs) and radio-quiet active galactic nuclei (AGNs) are more common at fainter flux densities.
Aims: Our aim is to develop …
eRASSt J040515.6 − 745202, an X-ray burster in the Magellanic Bridge
Haberl, F.; Ray, P. S.; Ducci, L. +13 more
Context. During the third all-sky survey (eRASS3), eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma, detected a new hard X-ray transient, eRASSt J040515.6 − 745202, in the direction of the Magellanic Bridge.
Aims: We arranged follow-up observations and searched for archival data to reveal the nature of the transient.
Met…
Dark halos around solar active regions. I. Emission properties of the dark halo around NOAA 12706
Andretta, V.; Del Zanna, G.; Murabito, M. +1 more
Context. Dark areas around active regions (ARs) were first observed in chromospheric lines more than a century ago and are now associated with the Hα fibril vortex around ARs. Nowadays, large areas surrounding ARs with reduced emission relative to the quiet Sun (QS) are also observed in spectral lines emitted in the transition region (TR) and the …