Search Publications
The evolution of lithium in FGK dwarf stars. Influence of planets and Galactic migration
Alfaro, E. J.; Cifuentes, C.; Cruz, P. +4 more
This work aims to investigate the behaviour of the lithium abundance in stars with and without detected planets. Our study is based on a sample of 1332 FGK main-sequence stars with measured lithium abundances, for 257 of which planets were detected. Our method reviews the sample statistics and is addressed specifically to the influence of tides an…
Formation of a streamer blob via the merger of multiple plasma clumps below 2 R⊙
Fu, Hui; Xia, Lidong; Huang, Zhenghua +7 more
Context. Propagating streamer blobs could be an important source of disturbances in the solar wind. Direct observations of the formation of streamer blobs could be a proxy for understanding the formation of small-scale structures and disturbances in the solar wind.
Aims: We aim to investigate how a streamer blob is formed before it is observe…
Chromospheric Mg I emission lines of pre-main-sequence stars
Itoh, Yoichi; Takagi, Yuhei; Yamashita, Mai
Context. To reveal details of the internal structure, the relationship between chromospheric activity and the Rossby number has been extensively examined for main-sequence stars. For active pre-main-sequence (PMS) stars, it is suggested that the level of activity be assessed using optically thin emission lines, such as Mg I. Aims. We aim to detect…
Characterisation of the stellar wind in Cyg X-1 via modelling of colour-colour diagrams
Sala, G.; Wilms, J.; Bachetti, M. +11 more
Context. Cygnus X-1 (Cyg X-1) is a high-mass X-ray binary where accretion onto the black hole (BH) is mediated by the stellar wind from the blue supergiant companion star HDE 226868. Due to its inclination, the system is a perfect laboratory to study the not yet well-understood stellar wind structure. In fact, depending on the position of the BH a…
Population of excited levels of Fe+, Ni+, and Cr+ in exocomets' gaseous tails
Lecavelier des Etangs, A.; Vrignaud, T.
The star β Pictoris is widely known for harbouring a large population of exocomets, which create variable absorption signatures in the stellar spectrum as they transit the star. Although the physical and chemical properties of these objects have long been elusive, the recently developed exocomet curve of growth technique has, for the first time, e…
Hidden by a star: The redshift and the offset broad line of the flat-spectrum radio quasar PKS 0903–57
Goldoni, P.; Boisson, C.; Pita, S. +5 more
Context. PKS 0903‑57 is a little-studied γ-ray blazar that has recently attracted considerable interest due to the strong flaring episodes observed since 2020 in high energy (HE; 100 MeV ≤ E ≤ 100 GeV) and very high-energy (VHE; 100 GeV ≤ E ≤ 10 TeV) γ-rays. Its nature and properties are still not well determined. In particular, it is unclear whet…
The GAPS Programme at TNG. LIII. New insights on the peculiar XO-2 system
Marzari, F.; Sozzetti, A.; Lanza, A. F. +20 more
Context. Planets in binary systems are a fascinating and yet poorly understood phenomenon. Since there are only a few known large-separation systems in which both components host planets, characterizing them is a key target for planetary science.
Aims: In this paper, we aim to carry out an exhaustive analysis of the interesting XO-2 system, w…
LBM-DEM modeling of particle-fluid interactions on active small solar bodies
Wang, Qiujun; Cheng, Bin; Baoyin, Hexi +1 more
Context. Aeolian-like surface features observed on small Solar System bodies have piqued interest in their underlying formation mechanisms. Understanding the evolution of fluid-solid interactions is crucial for elucidating the nature of cometary activity. Aims. We established a resolved fluid-particle simulation approach and implemented it into ou…
Magnetic field of the roAp star KIC 10685175: Observations versus theory
Zhang, Huawei; Cang, Tianqi; Fu, Jianning +5 more
Context. KIC 10685175 is a roAp star whose polar magnetic field is predicted to be 6 kG through a nonadiabatic axisymmetric pulsation theoretical model. Aims. In this work, we aim to measure the magnetic field strength of KIC 10685175 using high-resolution spectropolarimetric observations, and compare it with the one predicted by the theoretical m…
When LAMOST meets Gaia DR3: Exploring the metallicity of open clusters
Fu, Xiaoting; Wang, Luqian; Han, Zhanwen +8 more
Context. Open clusters (OCs) are excellent probes as their age and abundance can be tightly constrained, allowing us to explore the distribution of metallicity and composition across the disk of the Milky Way. By conducting a comprehensive analysis of the metallicity of OCs, we can obtain valuable information about the history of their chemical en…