Search Publications
Simultaneous X-ray and optical variability of M dwarfs observed with eROSITA and TESS
Stelzer, B.; Magaudda, E.; Joseph, W. M. +1 more
Context. M-dwarf stars are the most numerous stars in the Galaxy, and are highly magnetically active. They exhibit bursts of radiation and matter, called flares and coronal mass ejections which have the potential to strongly affect the habitability of their planets.
Aims: We investigate variability through simultaneous optical and X-ray obser…
Mg II h&k spectra of an enhanced network region simulated with the MURaM-ChE code: Results using 1.5D synthesis
Solanki, S. K.; Leenaarts, J.; Cameron, R. +3 more
Context. The Mg II h&k lines are key diagnostics of the solar chromosphere. They are sensitive to the temperature, density, and nonthermal velocities in the chromosphere. The average Mg II h&k line profiles arising from previous 3D chromospheric simulations are too narrow compared to observations. Aims. We study the formation and properties of the…
eRASSU J060839.5-704014: A double degenerate ultra-compact binary in the direction of the LMC
Haberl, F.; Rau, A.; Vasilopoulos, G. +7 more
Context. During four all-sky surveys (eRASS1-4), eROSITA, the soft X-ray instrument aboard Spektrum-Roentgen-Gamma (SRG) detected a new supersoft X-ray source, eRASSU J060839.5−704014, in the direction of the Large Magellanic Cloud (LMC).
Aims: We arranged follow-up observations in the X-ray and optical wavelengths and further searched in arc…
Structure and dynamics of the Hermean magnetosphere revealed by electron observations from the Mercury electron analyzer after the first three Mercury flybys of BepiColombo
André, N.; Fedorov, A.; Sauvaud, J. -A. +16 more
Context. The Mercury electron analyzer (MEA) obtained new electron observations during the first three Mercury flybys by BepiColombo on October 1, 2021 (MFB1), June 23 , 2022 (MFB2), and June 19, 2023 (MFB3). BepiColombo entered the dusk side magnetotail from the flank magnetosheath in the northern hemisphere, crossed the Mercury solar orbital equ…
A combined LOFAR and XMM-Newton analysis of the disturbed cluster PSZ2G113.91-37.01
Brunetti, G.; Rossetti, M.; Gastaldello, F. +10 more
In this work, we investigate the interplay between the X-ray and radio emission of the cluster PSZ2G113.91-37.01 (z = 0.371) using the high-quality XMM-Newton observations of the Cluster HEritage project with XMM-Newton - Mass Assembly and Thermodynamics at the Endpoint of structure formation (CHEX-MATE), and the images from the second data releas…
Spectral characterisation of the extinction properties of NGC 3603 using JWST NIRSpec
De Marchi, Guido; Brandl, Bernhard; Rogers, Ciarán
Context. A necessary ingredient in understanding the star formation history of a young cluster is knowledge of the extinction towards the region. This has typically been done by making use of the colour-difference method with photometry, or similar methods utilising the colour-colour diagram. These approaches rely on adopting an extinction law wit…
The X-ray binaries in M83: Will any of them form gravitational wave sources for LIGO-VIRGO-KAGRA?
Kotko, I.; Belczynski, K.
There are 214 X-ray point sources (LX > 1035 erg s−1) identified as X-ray binaries (XRBs) in the nearby spiral galaxy M83. Since XRBs are powered by accretion onto a neutron star (NS) or a black hole (BH) from a companion or donor star, these systems are promising progenitors of merging double compact objects (D…
Optical tomography of the born-again ejecta of A 58
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
In a born-again planetary nebula (PN), processed H-deficient material has been injected inside the old, H-rich nebula as a result of a very late thermal pulse (VLTP) event. Long-slit spectra have been used to unveil the chemical and physical differences between these two structures, but the ejection and shaping processes still remain unclear. To p…
Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari
Potravnov, I.; Ryabchikova, T.; Piskunov, N.
The combination of the surface magnetic and abundance inhomogeneities in chemically peculiar Ap/Bp stars is responsible for their rotationally modulated variability. Within the framework of the fossil field hypothesis, these inhomogeneities are considered to be essentially stable over the main sequence timescale. However, a small group of Ap/Bp st…
Spectral characterization of young LT dwarfs
Scholz, A.; Mužić, K.; Almendros-Abad, V. +1 more
Context. JWST and next-generation facilities are expected to uncover populations of free-floating objects below the deuterium-burning limit in a number of young clusters and star-forming regions. These young planetary-mass brown dwarfs have spectral types L and T; they are shaped by molecular absorption and modified by their low gravity, which mak…