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First Determination in the Extended Corona of the 2D Thermal Evolution of a Current Sheet after a Solar Eruption
Susino, Roberto; Fineschi, Silvano; Stangalini, Marco +26 more
For the first time the evolution of the coronal reconfiguration after a coronal mass ejection (CME) was observed by the multichannel Metis Coronagraph on board the ESA–Solar Orbiter mission. The images acquired in visible light (VL) between 3.0 and 5.4 R ⊙ show the formation after a CME of a bright elongated radial feature interpreted a…
AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations
Kaspi, Shai; Filippenko, Alexei V.; Barth, Aaron J. +39 more
We observed the Seyfert 1 galaxy Mrk 817 during an intensive multiwavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lines seen in the Hubble Space Telescope/Cosmic Origins Spectrograph spectra, both during the campaign and in other epochs extending over 14 yr. We conclude that, while the…
Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b
Tamura, M.; Pallé, E.; Hirano, T. +53 more
One of the main goals of the NASA Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of Earth-like planets around nearby M-dwarf stars. We present the discovery and validation of three new short-period Earth-sized planets orbiting nearby M dwarfs: TOI-5720 b, TOI-6008 b, and TOI-6086 b. We combined TESS data, ground-based multic…
The VIRUS-dE Survey. I. Stars in Dwarf Elliptical Galaxies—3D Dynamics and Radially Resolved Stellar Initial Mass Functions
Bender, Ralf; Thomas, Jens; Hill, Gary J. +9 more
We analyze the stellar structure of a sample of dwarf ellipticals (dEs) inhabiting various environments within the Virgo cluster. Integral-field observations with a high spectral resolution allow us to robustly determine their low-velocity dispersions (∼25 km s‑1) and higher-order kinematic moments out to the half-light radius. We find …
First detection of CF+ in the Large Magellanic Cloud
Gong, Yan; Menten, Karl M.; Jacob, Arshia M. +2 more
Context. CF+ has been established as a valuable diagnostic tool for investigating photodissociation regions (PDRs) and fluorine abundances in the Milky Way. However, its role in extragalactic environments remains largely uncharted.
Aims: Our objective is to explore the significance of CF+ in the Large Magellanic Cloud (L…
Local Proton Heating at Magnetic Discontinuities in Alfvénic and Non-Alfvénic Solar Wind
Bandyopadhyay, R.; Tenerani, A.; Verniero, J. L. +1 more
We investigate the local proton energization at magnetic discontinuities/intermittent structures and the corresponding kinetic signatures in velocity phase space in Alfvénic (high cross helicity) and non-Alfvénic (low cross helicity) wind streams observed by Parker Solar Probe. By means of the partial variance of increments method, we find that th…
Walking the Line: Young Stars on the Boundary of the Epsilon Cha and Lower Centaurus Crux Associations
Kastner, Joel H.; Dickson-Vandervelde, D. Annie; Varga, Attila +1 more
Gaia Data Release 3 (DR3) has provided the largest and most astrometrically precise catalog of nearby stars to date, allowing for a more complete membership census of nearby, young stellar moving groups. These loose associations of young (age <100 Myr) stars within ∼100 pc are vital laboratories for the study of the early evolution of low-mass …
The search for DA double white dwarf binary candidates from SDSS DR14
Zhao, Gang; Li, Zhenwei; Zhao, Jingkun +4 more
Aims: Double white dwarf (DWD) binaries are one of the channels through which type Ia supernovae explosions occur. With the release of more and more sky survey data, the search for additional DWDs has become a possibility. We utilized the spectroscopic data from SDSS DR14 to search for DWD binaries based on variations in radial velocities (RV…
Flare heating of the chromosphere: Observations of flare continuum from GREGOR and IRIS
Berlicki, A.; Liu, W.; Dudík, J. +8 more
Context. On 2022 May 4, an M5.7 flare erupted in the active region NOAA 13004, which was the target of a coordinated campaign between GREGOR, IRIS, Hinode, and ground-based instruments at the Ondřejov observatory. A flare kernel located at the edge of a pore was co-observed by the IRIS slit and GREGOR HiFI+ imagers. Aims. We investigated the flare…
NIKA2 observations of dust grain evolution from star-forming filament to T-Tauri disk: Preliminary results from NIKA2 observations of the Taurus B211/B213 filament
Berta, S.; Aussel, H.; Adam, R. +51 more
To understand the evolution of dust properties in molecular clouds in the course of the star formation process, we constrain the changes in the dust emissivity index from star-forming filaments to prestellar and protostellar cores to T Tauri stars. Using the NIKA2 continuum camera on the IRAM 30 m telescope. we observed the Taurus B211/B2I3 filame…