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The Magnetic Field in Quiescent Star-forming Filament G16.96+0.27
Pattle, Kate; Sanhueza, Patricio; Kwon, Woojin +20 more
We present 850 µm thermal dust polarization observations with a resolution of 14.″4 (∼0.13 pc) toward an infrared dark cloud G16.96+0.27 using James Clerk Maxwell Telescope/POL-2. The average magnetic field orientation, which roughly agrees with the larger-scale magnetic field orientation traced by the Planck 353 GHz data, is approximately p…
A Model of the C IV λ λ1548, 1550 Doublet Line in T Tauri Stars
France, Kevin; Calvet, Nuria; Espaillat, Catherine C. +7 more
The C IV doublet in the UV has long been associated with accretion in T Tauri stars. However, it is still unclear where and how the lines are formed. Here, we present a new C IV line model based on the currently available accretion shock and accretion flow models. We assume axisymmetric, dipolar accretion flows with different energy fluxes and cal…
Unveiling the role of magnetic fields in a filament accreting onto a young protocluster
Caselli, Paola; Redaelli, Elena; Duarte-Cabral, Ana +4 more
Context. To develop a more comprehensive picture of star formation, it is essential to understand the physical relationship between dense cores and the filaments embedding them. There is evidence that magnetic fields play a crucial role in this context.
Aims: We aim to understand how magnetic fields influence the properties and kinematics of …
Type II radio bursts and space weather phenomena: A statistical study
Chandra, Ramesh; Miteva, Rositsa; Koleva, Kostadinka +2 more
In this paper, we present for the first time a comprehensive statistical study between type II radio bursts from the metric (m) to the dekameric–hectometric (DH) domain and their associated solar and space weather (SW) phenomena, namely, solar flares (SFs), sunspot (SN) configurations, filament eruptions, coronal mass ejections (CMEs), their inter…
Measurements of Sunspot Group Tilt Angles Based on SOHO/MDI and SDO/HMI Magnetograms
Zeng, Xiang-Yun; Zheng, Sheng; Huang, Yao +4 more
The tilt angle of sunspot groups plays a crucial role in solar dynamo models for the generation of the poloidal field, yet the statistical properties of the tilt angle are not fully comprehended. This study employs magnetograms from the Solar and Heliospheric Observatory/Michelson Doppler Imager and Solar Dynamics Observatory/Helioseismic and Magn…
Mid-term Periodicity of Coronal Mass Ejections during the Time Interval 1996–2022
Mei, Ying; Wang, Feng; Deng, Hui +3 more
Coronal mass ejections (CMEs) exhibit a wide range of quasiperiodic variations and are crucial for our understanding of the cyclical evolution of large-scale magnetic fields. However, the mid-term periodicities of different types of CMEs associated with different processes at the source location need to be clearly understood. Based on the CDAW cat…
Parameter Study of Geoeffective Active Regions
Veronig, Astrid; Nedal, Mohamed; Pötzi, Werner +1 more
Geomagnetic storms (GSs) are major disturbances in the terrestrial atmosphere caused by the reconnection process between the incoming plasma ejecta in the solar wind and the planetary magnetosphere. The strongest GSs can lead to auroral displays even at lower latitudes, and cause both satellite and ground-based infrastructure malfunctions. The ear…
Post-AGB candidate IRAS 02143+5852: Cepheid-like variability, three-layer circumstellar dust envelope and spectral features
Rudy, R. J.; Shugarov, S. Yu; Ikonnikova, N. P. +8 more
We present the results of multicolour UBVRCICJHK photometry, spectroscopic analysis and spectral energy distribution (SED) modelling for the post-AGB candidate IRAS 02143+5852. We detected Cepheid-like light variations with the full peak-to-peak amplitude ΔV ~ 0.9 mag and the pulsation period of about 24.9 d. The phased light…
X-ray Analysis of Seyfert 1 Galaxies with Optical Polarization: A Test for Unification Models
Guainazzi, M.; Jiménez-Bailón, E.; Longinotti, A. L. +3 more
In accordance with the AGN Unified Model, observed polarization can be related to the orientation of the line of sight with respect to the torus. AGN X-ray emission arises from the central region and carries the imprints of the obscuring material. We aim to test a unified scheme based on optical polarization using X-ray absorption. Using the XMM-N…
BD+44°493: Chemo-dynamical Analysis and Constraints on Companion Planetary Masses from WIYN/NEID Spectroscopy
Placco, Vinicius M.; Logsdon, Sarah E.; Holmbeck, Erika M. +11 more
In this work, we present high-resolution (R ∼ 100,000), high signal-to-noise ratio (S/N ∼ 800) spectroscopic observations for the well-known, bright, extremely metal-poor, carbon-enhanced star BD+44°493. We determined chemical abundances and upper limits for 17 elements from WIYN/NEID data, complemented with 11 abundances redetermined from Subaru …