Search Publications
Low-redshift Lyman Continuum Survey (LzLCS). Radio continuum properties of low-z Lyman continuum emitters
Pentericci, Laura; Jaskot, Anne E.; Flury, Sophia R. +20 more
Context. Sources that leak Lyman continuum (LyC) photons and lead to the reionisation of the universe are an object of intense study using multiple observing facilities. Recently, the Low-redshift LyC Survey (LzLCS) has presented the first large sample of LyC emitting galaxies at low redshift (z ∼ 0.3) with the Hubble Space Telescope Cosmic Origin…
Forming localized dust concentrations in a dust ring: DM Tau case study. The asymmetric 7 mm dust continuum of the DM Tau disk
Dong, Ruobing; Kataoka, Akimasa; Liu, Hauyu Baobab +8 more
Context. Previous high-angular-resolution 225 GHz (~1.3 mm) continuum observations of the transitional disk DM Tau have resolved an outer ring at 20-120 au radii that is weakly azimuthally asymmetric.
Aims: We aim to examine dust growth and filtration in the outer ring of DM Tau.
Methods: We performed ~0″.06 (~8.7 au) resolution Karl G. …
X-ray view of dissipative warm corona in active galactic nuclei
Bianchi, S.; Petrucci, P. O.; Belmont, R. +8 more
Context. Detections of the X-ray spectra of active galactic nuclei (AGNs) typically reveal a noticeable excess of soft X-rays beyond the extrapolation of the power-law trend observed between 2 and 10 keV. However, the cause of this surplus remains unclear. In the scenario of soft Comptonization, observations suggest a warm corona temperature, rang…
Examining the nature of the ultraluminous X-ray source Holmberg II X-1
Pinto, C.; Di Salvo, T.; Roberts, T. P. +4 more
We present a comprehensive spectral analysis of the ultraluminous X-ray source Holmberg II X-1 using broadband and high-resolution X-ray spectra taken with the XMM-Newton satellite over a period of 19 yr, taking advantage of data from a recent campaign. We tested several models for the broadband spectra, including a double thermal component provid…
Connecting remote and in situ observations of shock-accelerated electrons associated with a coronal mass ejection
Jebaraj, I. C.; Vainio, R.; Kilpua, E. K. J. +7 more
Context. One of the most prominent sources for energetic particles in our Solar System are huge eruptions of magnetised plasma from the Sun, known as coronal mass ejections (CMEs), which usually drive shocks that accelerate charged particles up to relativistic energies. In particular, energetic electron beams can generate radio bursts through the …
Secular change in the spin states of asteroids due to radiation and gravitation torques. New detections and updates of the YORP effect
Snodgrass, C.; Ehgamberdiev, Sh. A.; Kučáková, H. +21 more
Context. The rotation state of small asteroids is affected in the long term by perturbing torques of gravitational and radiative origin (the YORP effect). The former can be detected by a change in the spin-axis orientation in the inertial space; the latter manifests itself by a quadratic increase in the rotation phase.
Aims: Direct observatio…
Planets observed with CHEOPS. Two super-Earths orbiting the red dwarf star TOI-776
Alonso, R.; Deeg, H.; Deleuil, M. +86 more
Context. M-dwarf stars are the most common of potential exoplanet host stars in the Galaxy. It is therefore very important to understand planetary systems orbiting such stars and to determine the physical parameters of such planets with high precision. Also with the launch of the James Webb Space Telescope (JWST) the observation of atmospheric par…
X-shooter spectroscopy of Liller 1 giant stars
Dalessandro, E.; Rich, R. M.; Mucciarelli, A. +8 more
We present the first comprehensive chemical study of a representative sample of 27 luminous red giant branch (RGB) stars belonging to Liller 1, a complex stellar system in the Galactic bulge. This study is based on medium-resolution near-infrared spectra acquired with X-shooter at the Very Large Telescope. We found a subpopulation counting 22 star…
Mass and wind luminosity of young Galactic open clusters in Gaia DR2
Morlino, G.; Celli, S.; Specovius, A. +2 more
Context. Star clusters constitute a significant part of the stellar population in our Galaxy. The feedback processes they exert on the interstellar medium impact multiple physical processes from the chemical to the dynamical evolution of the Galaxy. In addition, young and massive stellar clusters might act as efficient particle accelerators and co…
CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective day side
Alonso, R.; Deleuil, M.; Erikson, A. +87 more
Context. Occultations are windows of opportunity to indirectly peek into the dayside atmosphere of exoplanets. High-precision transit events provide information on the spin-orbit alignment of exoplanets around fast-rotating hosts.
Aims: We aim to precisely measure the planetary radius and geometric albedo of the ultra-hot Jupiter (UHJ) KELT-2…