Search Publications
The interplay between disk wind and magnetospheric accretion mechanisms in the innermost environment of RU Lup
Labadie, L.; Dougados, C.; Bouvier, J. +10 more
Context. Hydrogen recombination lines such as Brγ are tracers of hot gas within the inner circumstellar disk of young stellar objects (YSOs). In the relatively cool innermost environment of T Tauri stars specifically, Brγ emission is closely associated with magnetically driven processes, such as magnetospheric accretion. Magnetospheric emission al…
Neutron-capture elements in a sample of field metal-poor N-rich dwarfs
Bonifacio, P.; Caffau, E.; Spite, M. +1 more
Context. The aim of this work is to measure the abundances of n-capture elements in a sample of six metal-poor N-rich dwarfs that were formed in globular clusters, and subsequently became unbound from the cluster. These N-rich stars, HD 25329, HD 74000, HD 160617, G 24-3, G53-41, and G90-3, were previously studied in Paper I.
Aims: The abunda…
Asteroseismology of the fast-rotating high-amplitude δ Scuti star V2367 Cygni
Daszyńska-Daszkiewicz, J.; Walczak, P.; Szewczuk, W.
We present the comprehensive analysis of the high-amplitude $\delta$ Sct star V2367 Cygni. First, we perform the frequency analysis for the whole available set of the Kepler and TESS photometry. Most of the frequency peaks are harmonics or combinations of the three known independent frequencies with the highest amplitudes, i.e.$\nu _1=5.661\,06$ d…
Probing ultralight primordial black hole dark matter with XMM telescopes
Yuan, Qiang; Guo, Jun; Zhu, Bin
Primordial black holes (PBHs), originating from the gravitational collapse of large overdensities in the early Universe, emerge as a compelling dark matter (DM) candidate across a broad mass range. Of particular interest are ultra-light PBHs with masses around 1014 to 1017 g, which are typically probed by searching their evap…
Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt
Thirouin, Audrey; Sheppard, Scott S.
The 5:3 and 7:4 mean motion resonances of Neptune are at 42.3 and 43.7 au, respectively, and overlap with objects in the classical trans-Neptunian belt (Kuiper Belt). We report the complete/partial lightcurves of 13 and 14 trans-Neptunian objects (TNOs) in the 5:3 and 7:4 resonances, respectively. We report a most likely contact binary in the 7:4 …
Variable Stars in M31 Stellar Clusters from the Panchromatic Hubble Andromeda Treasury
Williams, Benjamin F.; Johnson, L. Clifton; Girardi, Léo +9 more
Variable stars in stellar clusters can offer key constraints on stellar evolution and pulsation models, utilizing estimates of host cluster properties to constrain stellar physical parameters. We present a catalog of 86 luminous (F814W < 19) variable stars in M31 clusters identified by mining the archival Panchromatic Hubble Andromeda Treasury …
Fe II fluorescence in main-sequence K-dwarfs
Eriksson, M.
Main-sequence K-dwarfs possess strong emission in the form of the H I Ly α line. There is a close coincidence between the energy corresponding to the transitions H I 1s-2p and Fe II (5D)5s 4D5/2-(5D)5p 4D5/2. Singly ionized iron has been confirmed being pumped by photo-excitation by…
Assessment of the near-Sun magnetic field of the 10 March 2022 coronal mass ejection observed by Solar Orbiter
Patsourakos, S.; Georgoulis, M. K.; Nindos, A. +1 more
Aims. We estimate the near-Sun axial magnetic field of a coronal mass ejection (CME) on 10 March 2022. Solar Orbiter's in situ measurements, 7.8 degrees east of the Sun-Earth line at 0.43 AU, provided a unique vantage point, along with the WIND measurements at 0.99 AU. We determine a single power-law index from near-Sun to L1, including in situ me…
A Joint Microwave and Hard X-Ray Study toward Understanding the Transport of Accelerated Electrons During an Eruptive Solar Flare
Chen, Bin; Yu, Sijie; Battaglia, Andrea F. +1 more
The standard flare model, despite its success, is limited in comprehensively explaining the various processes involving nonthermal particles. One such missing ingredient is a detailed understanding of the various processes involved during the transport of accelerated electrons from their site of acceleration to different parts of the flare region.…
Magnetic properties of the umbral boundary during sunspot decay: Comparative study of multiple datasets
Jurčák, J.; Bello González, N.; García-Rivas, M.
Context. In recent years, the magnetic properties of the umbra-penumbra boundary of sunspots and the boundary of pores at various evolutionary stages have been characterised using datasets from different instruments. Aims. We aim to study the intrinsic differences between the intensity and vector magnetic field properties derived from Hinode/SP an…