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High-resolution imaging of the evolving bipolar outflows in symbiotic novae: The case of the RS Ophiuchi 2021 nova outburst
Munari, U.; Giroletti, M.; Williams, D. R. A. +6 more
Context. The recurrent and symbiotic nova RS Ophiuchi (RS Oph) underwent a new outburst phase during August 2021, about 15 years after the last event that occurred in 2006. This outburst represents the first nova event ever detected at very high energies (VHE, E > 100 GeV), and a whole set of coordinated multiwavelength observations were trigge…
Confirmation of the presence of a CRSF in the NICER spectrum of X 1822-371
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Aims: X 1822-371 is an eclipsing binary system with a period close to 5.57 h and an orbital period derivative Ṗorb of 1.42(3) × 10−10 s s−1. The extremely high value of its Ṗorb is compatible with a super-Eddington mass transfer rate from the companion star and, consequently, an intrinsic luminosity…
Coronal and chromospheric activity of Teegarden's star
Schmitt, J. H. M. M.; Czesla, S.; Reiners, A. +11 more
Teegarden's star is a late-type M-dwarf planet host, typically showing only rather low levels of activity. In this paper we present an extensive characterisation of this activity at photospheric, chromospheric, and coronal levels. We specifically investigated TESS observations of Teegarden's star, which showed two very large flares with an estimat…
Latitudinal Distribution of Dayside Magnetospheric Currents Based on Cluster Observations
Dunlop, Malcolm W.; Liu, Wenlong; Du, Yingshuai +2 more
Based on the curlometer method, we calculate the azimuthal component of the current density from nearly 19 years of Fluxgate Magnetometer (FGM) data of Cluster and investigate its latitudinal distribution in the dayside noon sector (09:00-15:00 magnetic local time, MLT). A crossing event in the noon meridian plane shows an unexpected eastward curr…
Long-term Variation of the Solar Polar Magnetic Fields at Different Latitudes
Hou, Yijun; Li, Ting; Yang, Shuhong +10 more
The polar magnetic fields of the Sun play an important role in governing solar activity and powering fast solar wind. However, because our view of the Sun is limited in the ecliptic plane, the polar regions remain largely uncharted. Using the high spatial resolution and polarimetric precision vector magnetograms observed by Hinode from 2012 to 202…
Extreme magnetic field modulus variability of the Bp star HD 57372
Ilyin, I.; Hubrig, S.; Järvinen, S. P. +2 more
Context. In chemically peculiar Ap/Bp stars with large-scale organised magnetic fields of simple centred dipole configuration, the ratio between the maximum and the minimum of the mean magnetic field modulus is on the order of 1.25. Values of two or more are observed only for very few Ap/Bp stars and are indicative of a very unusual magnetic field…
Longitudinal Extent of 3He-rich Solar Energetic Particle Events Near 1 au
Kouloumvakos, Athanasios; Wimmer-Schweingruber, Robert F.; Allen, Robert C. +3 more
Multispacecraft observations of 3He-rich solar energetic particle (SEP) events are scarce, but much needed in order to understand and properly constrain the source and transport of these remarkably enriched 3He SEP events. In this paper, we report 15 3He-rich SEP events that were detected by the Advanced Compositio…
The disk of the eruptive protostar V900 Mon. A MATISSE/VLTI and MUSE/VLT perspective
Lykou, F.; Ábrahám, P.; Chen, L. +8 more
Aims: In this work, we study the silicate dust content in the disk of one of the youngest eruptive stars, V900 Mon, at the highest angular resolution, probing down to the inner 10 au of said disk, and study the historical evolution of the system, traced in part by a newly discovered emission clump.
Methods: We performed high angular reso…
A multiwavelength study of the most distant gamma-ray detected BL Lacertae object 4FGL J1219.0+3653 (z = 3.59)
Domínguez, A.; Gallego, J.; Cardiel, N. +3 more
BL Lac objects are a class of jetted active galactic nuclei that do not exhibit or have weak emission lines in their optical spectra. Recently, the first γ-ray emitting BL Lac beyond
Dynamical traceback age of the Octans young stellar association
Miret-Roig, N.; Bouy, H.; Barrado, D. +2 more
Context. Octans is one of the most distant (d ∼ 150 pc) young stellar associations of the solar neighbourhood, and it has not yet been sufficiently explored. Its age is still poorly constrained in the literature and requires further investigation.
Aims: We take advantage of the state-of-the-art astrometry delivered by the third data release o…