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2021 occultations and transits of Linus orbiting (22) Kalliope. I. Polygonal and cliptracing algorithms
Carry, B.; Jehin, E.; de Wit, J. +10 more
Aims: The satellite Linus orbiting the main-belt asteroid (22) Kalliope exhibited mutual occultation and transit events in late 2021. A photometric campaign was organised and observations were undertaken by the TRAPPIST-South, SPECULOOS-Artemis, OWL-Net, and BOAO telescopes, with the goal to further constrain dynamical and photometric models …
Central concentration of asymmetric features in post-starburst galaxies at z 0.8
Kajisawa, Masaru; Himoto, Kazuharu G.
We present morphological analyses of post-starburst galaxies (PSBs) at 0.7 < z < 0.9 in the COSMOS field. We fitted ultraviolet to mid-infrared multiband photometry of objects with i < 24 from COSMOS2020 catalogue with population synthesis models assuming non-parametric, piece-wise constant function of star formation history, and selected…
Tracing the Assembly Histories of Galaxy Clusters in the Nearby Universe
Andernach, H.; Caretta, C. A.; Coziol, R. +10 more
We have compiled a sample of 67 nearby (z < 0.15) clusters of galaxies, for which on average more than 150 spectroscopic members are available and, by applying different methods to detect substructures in their galaxy distribution, we have studied their assembly history. Our analysis confirms that substructures are present in 70% of our sample,…
Hot accretion flows in low-luminosity active galactic nuclei in NGC 4258 and NGC 7213
Szanecki, Michał; Niedźwiecki, Andrzej; Wojaczyński, Rafał
We study the high energy emission of two active galactic nuclei (AGNs), NGC 4258 and NGC 7213. We directly apply the general-relativistic hot flow model, KERRFLOW, to the archival BeppoSAX, NuSTAR, and Suzaku observations of these objects. Most of these data sets indicate that about 10-20 per cent of the accretion power is used for the direct heat…
NICMOS Kernel-phase Interferometry. II. Demographics of Nearby Brown Dwarfs
Kraus, Adam L.; Factor, Samuel M.
Star formation theories have struggled to reproduce binary brown dwarf population demographics (e.g., frequency, separation, and mass ratio). Kernel-phase interferometry is sensitive to companions at separations inaccessible to classical imaging, enabling tests of these theories at new physical scales below the hydrogen burning limit. We analyze t…
Pits on Jupiter-family Comets and the Age of Cometary Surfaces
Guilbert-Lepoutre, Aurélie; Besse, Sébastien; Benseguane, Selma +4 more
Large and deep depressions, also known as pits, are observed at the surface of all Jupiter-family comets (JFCs) imaged by spacecraft missions. They offer the opportunity to glimpse the subsurface characteristics of comet nuclei and study the complex interplay between surface structures and cometary activity. This work investigates the evolution of…
The energetic storm particle events of 3 November 2021
Marcucci, Maria Federica; Consolini, Giuseppe; Chiappetta, Federica +3 more
Observations of energetic particles at interplanetary shocks are important to study acceleration mechanisms and their connection with magnetohydrodynamic turbulence. Energetic storm particle (ESP) events are increases in proton fluxes that occur locally at the passage time of interplanetary shocks. These events are more dangerous when they are sup…
The Unexpected Optical and Ultraviolet Variability of the Standard Star α Sex (HD 87887)
Bowman, Dominic M.; Lebreton, Yveline; Monier, Richard +1 more
The analysis of the available Transiting Exoplanet Survey Satellite (TESS) light curves of α Sex (HD 87887) reveals low-frequency pulsations with a period of about 9.1 hr in this spectroscopic A0 III standard star. The IUE observations in 1992 December reveal large flux variations both in the far-UV and in the mid-UV, which are accompanied by vari…
Coronal spectroscopy: Probing sources of slow solar wind in active regions, and the early phases of solar flares
Harra, Louise K.
Coronal spectroscopy has pushed forward the understanding of physical processes in all phenomena on the Sun. In this review we concentrate specifically on plasma parameters measured in sources of the slow solar wind in active regions and the early phases of solar flares. These topics are a key part of the science goals of the Solar Orbiter mission…
Searching for open clusters in Gaia DR3 using a parallax-blind approach
Carballo-Bello, Julio A.; Gran, Felipe; Peña-Ramírez, Karla +1 more
Gaia data is providing a unique opportunity to explore the structure of the Milky Way by discovering more and more of one of its best tracers: open clusters. Innovative algorithms, supported by Gaia accurate proper motions, parallaxes, photometry, and radial velocities (whenever available), have identified hundreds of new clusters of stars across …