Search Publications

z-GAL: A NOEMA spectroscopic redshift survey of bright Herschel galaxies. I. Overview (Corrigendum)

Berta, S.; Omont, A.; Buat, V. +35 more

The evolution of coronal shock wave properties and their relation with solar energetic particles

Kouloumvakos, Athanasios; Rouillard, Alexis P.; Dresing, Nina +5 more

Context. Shock waves driven by fast and wide coronal mass ejections (CMEs) are considered to be very efficient particle accelerators and are involved in the production of solar energetic particle (SEP) events. These events cause space weather phenomena by disturbing the near-Earth radiation environment. In past studies, we analysed statistically t…

Multiwavelength radiation from the interaction between magnetar bursts and a companion star in a binary system

Wei, Da-Ming; Wei, Yu-Jia; Yang, Yuan-Pei +1 more

Magnetars are young, highly magnetized neutron stars that are associated with magnetar short bursts (MSBs), magnetar giant flares (MGFs), and at least some fast radio bursts (FRBs). In this work, we consider a magnetar and a main sequence star in a binary system and analyze the properties of the electromagnetic signals generated by the interaction…

Unveiling the role of magnetic fields in a filament accreting onto a young protocluster

Caselli, Paola; Redaelli, Elena; Duarte-Cabral, Ana +4 more

Context. To develop a more comprehensive picture of star formation, it is essential to understand the physical relationship between dense cores and the filaments embedding them. There is evidence that magnetic fields play a crucial role in this context.
Aims: We aim to understand how magnetic fields influence the properties and kinematics of …

Quiescent black hole X-ray binaries as multi-messenger sources

Calore, Francesca; Kantzas, Dimitrios

The origin of Galactic cosmic rays (CRs) is unknown even though they have traditionally been connected to supernovae based on energetic arguments. In the past decades, Galactic black holes in X-ray binaries (BHXBs) have been proposed as candidate sources of CRs, which revises the CR paradigm. BHXBs launch two relativistic jets during their outburs…

The Gaia-ESO Survey: No sign of multiple stellar populations in open clusters from their sodium and oxygen abundances

Baratella, M.; Randich, S.; Bragaglia, A. +9 more

Context. The light element (anti-)correlations shown by globular clusters (GCs) are the main spectroscopic signature of multiple stellar populations. These internal abundance variations provide us with fundamental constraints on the formation mechanism of stellar clusters.
Aims: Using Gaia-ESO, the largest and most homogeneous survey of open …

Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra

Scaringi, Simone; Schwope, Axel; Anupama, G. C. +8 more

We present the analysis of optical photometric and spectroscopic observations of two non-magnetic cataclysmic variables, namely CRTS J080846.2+313106 and V416 Dra. We find CRTS J080846.2+313106 to vary with a period of 4.9116 ± 0.0003 h, which was not found in earlier studies and which we provisionally suggest is the orbital period of the system. …

Bright-rimmed clouds in IC 1396: I. Dynamics

Güsten, Rolf; Ishihara, Daisuke; Okada, Yoko +14 more

Aims. We investigate the dynamical and physical structures of bright-rimmed clouds (BRCs) in a nearby H II region. We focused on carbon- and oxygen-bearing species that trace photon-dominated regions (PDRs) and warm molecular cloud surfaces in order to understand the effect of UV radiation from the exciting stars on the cloud structure. Methods. W…

Advanced classification of hot subdwarf binaries using artificial intelligence techniques and Gaia DR3 data

Álvarez, M. A.; Dafonte, C.; Manteiga, M. +11 more

Context. Hot subdwarf stars are compact blue evolved objects, burning helium in their cores surrounded by a tiny hydrogen envelope. In the Hertzsprung-Russell Diagram they are located by the blue end of the Horizontal Branch. Most models agree on a quite probable common envelope binary evolution scenario in the Red Giant phase. However, the curren…

NSVS 14256825: Period variation and orbital stability analysis of two possible substellar companions

Zervas, K.; Christopoulou, P. -E.

Context. Recent period investigations of the post-common envelop binary (PCEB) NSVS 14256825 suggest that two circumbinary companions are necessary to explain the observed eclipse timing variations (ETVs). Aims. Our objective in this work was to search for the best-fitting curve of two LTTE terms of the ETV diagram by implementing a grid search op…