Search Publications
Constraining stellar rotation and planetary atmospheric evolution of a dozen systems hosting sub-Neptunes and super-Earths
Fossati, L.; Kubyshkina, D.; Bonfanti, A. +1 more
Context. Planetary atmospheric evolution modelling is a prime tool for understanding the observed exoplanet population and constraining formation and migration mechanisms, but it can also be used to study the evolution of the activity level of planet hosts.
Aims: We constrain the planetary atmospheric mass fraction at the time of the dispersa…
Mysterious, variable, and extremely hot: White dwarfs showing ultra-high excitation lines. I. Photometric variability
Pelisoli, Ingrid; Reindl, Nicole; Schaffenroth, Veronika +3 more
Context. About 10% of all stars exhibit absorption lines of ultra-highly excited (UHE) metals (e.g., O VIII) in their optical spectra when entering the white dwarf cooling sequence. This is something that has never been observed in any other astrophysical object, and poses a decades-long mystery in our understanding of the late stages of stellar e…
Balmer continuum enhancement detected in a mini flare observed with IRIS
Heinzel, Petr; Schmieder, Brigitte; Joshi, Reetika +3 more
Context. Optical and near-UV continuum emissions in flares contribute substantially to the flare energy budget. Two mechanisms play an important role for continuum emission in flares: hydrogen recombination after sudden ionization at chromospheric layers, and transportation of the energy radiatively from the chromosphere to lower layers in the atm…
The AMBRE Project: Solar neighbourhood chemodynamical constraints on Galactic disc evolution
Recio-Blanco, A.; de Laverny, P.; Kordopatis, G. +2 more
Context. The abundance of α-elements relative to iron ([α/Fe]) is an important fossil signature in Galactic archaeology for tracing the chemical evolution of disc stellar populations. High-precision chemical abundances, together with accurate stellar ages, distances, and dynamical data, are crucial to infer the Milky Way formation history.
Ai…
Molecular gas kinematics in the nuclear region of nearby Seyfert galaxies with ALMA
Andreani, P.; Hatziminaoglou, E.; Spinoglio, L. +11 more
Context. The study of the distribution, morphology, and kinematics of cold molecular gas in the nuclear and circumnuclear regions of active galactic nuclei (AGNs) helps to characterise and hence to quantify the impact of the AGNs on the host galaxy over its lifetime.
Aims: We present the analysis of the molecular gas in the nuclear regions of…
Fragmentation in the massive G31.41+0.31 protocluster
Maud, L. T.; Csengeri, T.; Beuther, H. +18 more
Context. ALMA observations at 1.4 mm and ~0."2 (~750 au) angular resolution of the Main core in the high-mass star-forming region G31.41+0.31 have revealed a puzzling scenario. On the one hand, the continuum emission looks very homogeneous and the core appears to undergo solid-body rotation, suggesting a monolithic core stabilized by the magnetic …
ORion Alma New GEneration Survey (ORANGES). I. Dust continuum and free-free emission of OMC-2/3 filament protostars
Ceccarelli, C.; Yang, Y. -L.; López-Sepulcre, A. +3 more
Context. The spectral energy distribution (SED) in the millimetre to centimetre range is an extremely useful tool for characterising the dust in protostellar envelopes as well as free-free emission from the protostar and outflow. Actually, the evolutionary status of solar-type protostars is often based on their SED in the near-infrared to millimet…
The nature of hyperluminous infrared galaxies
Małek, K.; Wang, L.; Farrah, D. +7 more
Context. Hyperluminous infrared galaxies (HLIRGs) are shown to have been more abundant in early epochs. The small samples used in earlier studies are not sufficient to draw robust statistical conclusions regarding the physical properties and the power sources of these extreme infrared (IR) bright galaxies.
Aims: We make use of multi-wavelengt…
Abell 1430: A merging cluster with exceptional diffuse radio emission
Brunetti, G.; Rossetti, M.; Shimwell, T. W. +16 more
Context. Diffuse radio emission has been found in many galaxy clusters, predominantly in massive systems which are in the state of merging. The radio emission can usually be classified as relic or halo emission, which are believed to be related to merger shocks or volume-filling turbulence, respectively. Recent observations have revealed radio bri…
ATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae. I. Morpho-kinematical interpretation of CO and SiO emission
Kervella, Pierre; Decin, Leen; Montargès, Miguel +36 more
Evolved low- to intermediate-mass stars are known to shed their gaseous envelope into a large, dusty, molecule-rich circumstellar nebula which typically develops a high degree of structural complexity. Most of the large-scale, spatially correlated structures in the nebula are thought to originate from the interaction of the stellar wind with a com…