Search Publications
Flux rope and dynamics of the heliospheric current sheet. Study of the Parker Solar Probe and Solar Orbiter conjunction of June 2020
Fedorov, A.; Parenti, S.; Lavraud, B. +19 more
Context. Solar Orbiter and Parker Solar Probe jointly observed the solar wind for the first time in June 2020, capturing data from very different solar wind streams: calm, Alfvénic wind and also highly dynamic large-scale structures. Context. Our aim is to understand the origin and characteristics of the highly dynamic solar wind observed by the t…
Theory of solar oscillations in the inertial frequency range: Linear modes of the convection zone
Gizon, Laurent; Cameron, Robert H.; Bekki, Yuto
Context. Several types of global-scale inertial modes of oscillation have been observed on the Sun. These include the equatorial Rossby modes, critical-latitude modes, and high-latitude modes. However, the columnar convective modes (predicted by simulations and also known as banana cells or thermal Rossby waves) remain elusive.
Aims: We aim t…
Solar coronal heating from small-scale magnetic braids
Barczynski, K.; Peter, H.; Chitta, L. P. +19 more
Relaxation of braided coronal magnetic fields through reconnection is thought to be a source of energy to heat plasma in active region coronal loops. However, observations of active region coronal heating associated with an untangling of magnetic braids remain sparse. One reason for this paucity could be the lack of coronal observations with a suf…
Multiplicity of Galactic luminous blue variable stars
Gosset, E.; Lobel, A.; Sana, H. +7 more
Context. Luminous blue variables (LBVs) are characterised by strong photometric and spectroscopic variability. They are thought to be in a transitory phase between O-type stars on the main sequence and the Wolf-Rayet stage. Recent studies also evoked the possibility that they might be formed through binary interaction. Only a few are known in bina…
Exoplanet Atmosphere Retrievals in 3D Using Phase Curve Data with ARCiS: Application to WASP-43b
Chubb, Katy L.; Min, Michiel
Aims: Our goal is to create a retrieval framework which encapsulates the three-dimensional (3D) nature of exoplanet atmospheres, and to apply it to observed emission phase curve and transmission spectra of the `hot Jupiter' exoplanet WASP-43b.
Methods: We present our 3D framework, which is freely available as a stand-alone module from Gi…
Euclid preparation. XIII. Forecasts for galaxy morphology with the Euclid Survey using deep generative models
Cimatti, A.; Schultheis, M.; Baccigalupi, C. +194 more
We present a machine learning framework to simulate realistic galaxies for the Euclid Survey, producing more complex and realistic galaxies than the analytical simulations currently used in Euclid. The proposed method combines a control on galaxy shape parameters offered by analytic models with realistic surface brightness distributions learned fr…
HR 6819 is a binary system with no black hole. Revisiting the source with infrared interferometry and optical integral field spectroscopy
Rivinius, Th.; Baade, D.; Shenar, T. +16 more
Context. Two scenarios have been proposed to match the existing observational constraints of the object HR 6819. The system could consist of a close inner B-type giant plus a black hole (BH) binary with an additional Be companion in a wide orbit. Alternatively, it could be a binary composed of a stripped B star and a Be star in a close orbit. Eith…
LoTSS jellyfish galaxies. III. The first identification of jellyfish galaxies in the Perseus cluster
Botteon, A.; van Weeren, R. J.; Ignesti, A. +4 more
In this paper we report the first identification of jellyfish galaxies in the Perseus cluster (Abell 426). We identified four jellyfish galaxies (LEDA 2191078, MCG +07-07-070, UGC 2654, UGC 2665) within the central 2° ×2° (2.6 Mpc × 2.6 Mpc) of Perseus based on the presence of one-sided radio continuum tails that were detected at 144 MHz by the LO…
Non-LTE abundance corrections for late-type stars from 2000 Å to 3 µm. I. Na, Mg, and Al
Sneden, C.; Lind, K.; Barklem, P. S. +6 more
Context. It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Making an accurate abundance determination requires taking those effects into account, but the necessary non-LTE (hereafter NLTE) calculations are often lacking.
Aims: Our goal is to provide detailed estimates of NLTE effects for FGK type s…
Survey of Orion Disks with ALMA (SODA). I. Cloud-level demographics of 873 protoplanetary disks
van Dishoeck, E. F.; Portegies Zwart, S.; Hacar, A. +2 more
Context. Surveys of protoplanetary disks in nearby star-forming regions (SFRs) have provided important information on their demographics. However, due to their sample sizes, these surveys cannot be used to study how disk properties vary with the environment.
Aims: We conduct a survey of the unresolved millimeter continuum emission of 873 prot…