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Estimates of Proton and Electron Heating Rates Extended to the Near-Sun Environment
McComas, D. J.; Bale, S. D.; Cranmer, S. R. +11 more
A central problem of space plasma physics is how protons and electrons are heated in a turbulent, magnetized plasma. The differential heating of charged species due to dissipation of turbulent fluctuations plays a key role in solar wind evolution. Measurements from previous heliophysics missions have provided estimates of proton and electron heati…
Imaging-spectroscopy of a band-split type II solar radio burst with the Murchison Widefield Array
Gallagher, Peter T.; Carley, Eoin P.; Oberoi, Divya +1 more
Type II solar radio bursts are caused by magnetohydrodynamic (MHD) shocks driven by solar eruptive events such as coronal mass ejections (CMEs). Often, both fundamental and harmonic bands of type II bursts are split into sub-bands, which are generally believed to be coming from upstream and downstream regions of the shock; however, this explanatio…
The Local Group's mass: probably no more than the sum of its parts
Johansson, Peter H.; Sawala, Till; Teeriaho, Meri
The total mass of the Local Group and the masses of its primary constituents, the Milky Way (MW) and M31, are important anchors for several cosmological questions. Recent independent measurements have consistently yielded halo masses close to 1012M⊙ for the MW, and 1-2 × 1012M⊙ for M31, while estimates d…
Spatial and dynamical structure of the NGC 2264 star-forming region
Micela, G.; Bonito, R.; Peres, G. +7 more
Context. The formation of stars within molecular clouds and the early stages of stellar evolution (e.g., mass accretion and disk dispersal) are all active research topics. The target of this study, NGC 2264, is a benchmark star-forming region in which these issues can be profitably studied.
Aims: We revisit the structure, dynamics, and star-f…
Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems
Perrin, Marshall D.; Ménard, François; Angelo, Isabel +9 more
The structure of protoplanetary disks plays an essential role in planet formation. A disk that is highly inclined, or "edge-on," is of particular interest since its geometry provides a unique opportunity to study the disk's vertical structure and radial extent. Candidate edge-on protoplanetary disks are typically identified via their unique spectr…
ATOMS: ALMA three-millimeter observations of massive star-forming regions - XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ( 1500 M⨀) clump
Tej, Anandmayee; Lee, Chang Won; Liu, Tie +16 more
Whether ionization feedback triggers the formation of massive stars is highly debated. Using ALMA 3-mm observations with a spatial resolution of ~0.05 pc and a mass sensitivity of 1.1 $\rm M_\odot$ per beam at 20 K, we investigate the star formation and gas flow structures within the ionizing feedback-driven structure, a clump-scale massive (≳ 150…
7Be detection in the 2021 outburst of RS Oph
Della Valle, M.; Bonifacio, P.; Hernanz, M. +7 more
The recurrent nova RS Oph underwent a new outburst on 2021 August 8, reaching a visible brightness of V = 4.8 mag. Observations of the 2021 outburst made with the high-resolution UVES spectrograph at the Kueyen-UT2 telescope at ESO-VLT in Paranal enabled detection of the possible presence of 7Be newly made in the thermonuclear runaway r…
SN 2023emq: A Flash-ionized Ibn Supernova with Possible C III Emission
Gromadzki, M.; Galbany, L.; Inserra, C. +16 more
SN 2023emq is a fast-evolving transient initially classified as a rare Type Icn supernova (SN), interacting with a H- and He-free circumstellar medium (CSM) around maximum light. Subsequent spectroscopy revealed the unambiguous emergence of narrow He lines, confidently placing SN 2023emq in the more common Type Ibn class. Photometrically, SN 2023e…
The unseen host galaxy and high dispersion measure of a precisely localized fast radio burst suggests a high-redshift origin
Prochaska, J. Xavier; Ryder, Stuart D.; Tejos, Nicolas +13 more
FRB 20210912A is a fast radio burst (FRB), detected and localized to subarcsecond precision by the Australian Square Kilometre Array Pathfinder. No host galaxy has been identified for this burst despite the high precision of its localization and deep optical and infrared follow-up, to 5σ limits of R = 26.7 mag and Ks = 24.9 mag with the…
Relativistic electron beams accelerated by an interplanetary shock
Lario, D.; Jebaraj, I. C.; Vainio, R. +16 more
Context. Collisionless shock waves have long been considered to be among the most prolific particle accelerators in the universe. Shocks alter the plasma they propagate through, and often exhibit complex evolution across multiple scales. Interplanetary (IP) traveling shocks have been recorded in situ for over half a century and act as a natural la…