Search Publications
J0011+3217: A peculiar radio galaxy with a one-sided secondary lobe and misaligned giant primary lobes
Hardcastle, Martin J.; Pal, Sabyasachi; Kumari, Shobha +1 more
From the LOFAR Two-metre Sky Survey second data release (LoTSS DR2) at 144 MHz, we identified a peculiar radio galaxy, J0011+3217. It has a large, one-sided diffuse secondary wing that stretches up to 0.85 Mpc (roughly 85% of the size of the primary lobe). The linear size of the primary lobe of the galaxy is 0.99 Mpc. This peculiar source is a gia…
TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system
Queloz, D.; Winn, J. N.; Kaltenegger, L. +54 more
Context. Small planets transiting bright nearby stars are essential to our understanding of the formation and evolution of exoplanetary systems. However, few constitute prime targets for atmospheric characterization, and even fewer are part of multiple star systems.
Aims: This work aims to validate TOI-4336 A b, a sub-Neptune-sized exoplanet …
Revealing the state transition of Cen X-3 at high spectral resolution with Chandra
Torrejón, J. M.; Postnov, K.; Nowak, M. +4 more
Cen X-3 is a compact, high-mass X-ray binary (HMXRB), likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of a target of opportunity Chandra observation made during a low-flux to high-flux transition. The high-resolution spectra allow us to delve into the events that occurred during this episode. T…
A comprehensive X-ray analysis of the massive O-type binary HD 93250 over two decades
De Becker, Michaël; Arora, Bharti; Pandey, Jeewan C.
Context. Massive star winds are known to be responsible for X-ray emission arising from wind plasma heated by the strong shocks up to temperatures of 106-107 K in the case of colliding wind binaries. The investigation of X-ray emission from massive stars thus constitutes a valuable tool for identifying binaries, which is othe…
Identification of a single plasma parcel during a radial alignment of the Parker Solar Probe and Solar Orbiter
Alexandrova, Olga; Maksimovic, Milan; Démoulin, Pascal +2 more
Configurations in which two spacecraft, such as the Parker Solar Probe (PSP) and Solar Orbiter, are radially aligned provide opportunities for studying the evolution of a single solar wind parcel during so-called plasma line-ups. The most critical part of these studies arguably is the identification of what can be considered the same plasma crossi…
Co-moving groups around massive stars in the nuclear stellar disk
Najarro, F.; Nogueras-Lara, F.; Schödel, R. +2 more
Context. Over the last ∼30 Myr, the nuclear stellar disk in the Galactic center has been the most prolific star-forming region of the Milky Way when averaged by volume. Remarkably, the combined mass of the only three clusters present today in the nuclear stellar disk adds up to only ∼10% of the total expected mass of young stars formed in this per…
The star formation history of the first bulge fossil fragment candidate Terzan 5
Dalessandro, E.; Cignoni, M.; Massari, D. +6 more
Context. Terzan 5 and Liller 1 are the only bulge stellar clusters hosting multi-iron and multi-age stellar populations. They are therefore claimed to constitute a novel class of astrophysical objects: the fossils of massive star-forming clumps that possibly sank to the center of the Milky Way and contributed to the formation of the bulge. This is…
Exploring the stellar rotation of early-type stars in the LAMOST medium-resolution survey: III. Evolution
Chiappini, Cristina; Sun, Weijia
Context. Stellar rotation significantly shapes the evolution of massive stars, yet the interplay of mass and metallicity remains elusive, limiting our capacity to construct accurate stellar evolution models and to better estimate the impact of rotation on the chemical evolution of galaxies. Aims. Our goal is to investigate how mass and metallicity…
Kinematics and star formation of hub-filament systems in W49A
Li, Dalei; Tang, Xindi; Zhou, Jianjun +11 more
Aims: W49A is a prominent giant molecular cloud (GMC) that exhibits strong star formation activities, yet its structural and kinematic properties remain uncertain. Our study aims to investigate the large-scale structure and kinematics of W49A, and elucidate the role of filaments and hub-filament systems (HFSs) in its star formation activity. …
Production of s-process elements in asymptotic giant branch stars as revealed by Gaia/GSP-Spec abundances
Recio-Blanco, A.; de Laverny, P.; Contursi, G. +2 more
Context. The recent parameterisation by the GSP-Spec module of Gaia/Radial Velocity Spectrometer stellar spectra has produced an homogeneous catalogue of about 174 000 asymptotic giant branch (AGB) stars. Among the 13 chemical elements presented in this Gaia third data release, the abundance of two of them (cerium and neodymium) have been estimate…