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The extended halo and tidal tails of the old open cluster NGC 2112
Gao, Xinhua; Zhu, Chengyu
This paper investigates the spatial structure and tidal tails of the nearby (
Varying water activity and momentum transfer on comet 67P/Churyumov-Gerasimenko from its non-gravitational forces and torques
Keller, H. U.; Groussin, O.; Attree, N. +9 more
Aims. We investigate the ability of a simultaneous fitting of comet 67P/Churyumov-Gerasimenko's non-gravitational forces, torques, and total water-outgassing rate, as observed by Rosetta, to constrain complex thermophysical models of cometary material. Methods. We extend the previous work of fitting geographically defined surface outgassing models…
SAUNAS. I. Searching for Low Surface Brightness X-Ray Emission with Chandra/ACIS
Koekemoer, Anton M.; Laine, Seppo; Lopez-Rodriguez, Enrique +8 more
We present Selective Amplification of Ultra Noisy Astronomical Signal (SAUNAS), a pipeline designed for detecting diffuse X-ray emission in the data obtained with the Advanced CCD Imaging Spectrometer (ACIS) of the Chandra X-ray Observatory. SAUNAS queries the available observations in the Chandra archive and performs photometric calibration, poin…
Extreme-ultraviolet (EUV) observables of simulated plasmoid-mediated reconnection in the solar corona
Martínez-Sykora, J.; Carlsson, M.; Nóbrega-Siverio, D. +1 more
Context. Understanding the role of magnetic reconnection in the heating and dynamics of the solar atmosphere requires detailed observational data of any observable aspect of the reconnection process, including small-scale features such as plasmoids.
Aims: Here, we examine the capability of active and upcoming instruments to detect plasmoids g…
Supernova Ejecta with Crystalline Silicate Dust in the Supernova Remnant MSH 15–52
Onaka, Takashi; Koo, Bon-Chul; Kim, Hyun-Jeong
IRAS 15099-5856 in the young supernova remnant (SNR) MSH 15‑52 is the first and only SNR-associated object with crystalline silicate dust detected so far, although its nature and the origin of the crystalline silicate are still unclear. In this paper, we present high-resolution mid-infrared (MIR) imaging observations of the bright central compact …
An Algorithm for the Determination of Coronal Mass Ejection Kinematic Parameters Based on Machine Learning
Shen, Fang; Yang, Yi; Li, Yucong +2 more
Coronal mass ejections (CMEs) constitute the major source of severe space weather events, with the potential to cause enormous damage to humans and spacecraft in space. It is becoming increasingly important to detect and track CMEs, since there are more and more space activities and facilities. We have developed a new algorithm to automatically de…
Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare
Morselli, A.; Chen, A. W.; Iacolina, M. N. +32 more
PKS 1830 -211 is a γ-ray emitting, high-redshift (z =2.507 ± 0.002), lensed flat-spectrum radio quasar. During the period 2019 mid-February to mid-April, this source underwent a series of strong γ-ray flares that were detected by both AGILE-GRID (Gamma-Ray Imaging Detector) and Fermi Large Area Telescope (Fermi-LAT), reaching a maximum γ-ray flux …
Water Ice and Possible Habitability in the Landing Area of Tianwen-1 Mission
Ding, Chunyu; Su, Yan; Li, Jiawei +3 more
The Tianwen-1 mission, marking China's inaugural venture into Mars exploration, successfully deployed the Zhurong rover on Utopia Planitia. This review primarily focuses on the insights provided by the Mars Rover Penetrating Radar (RoPeR), a pivotal component of the mission's scientific payload. The article synthesizes the RoPeR findings with an e…
Orbital and Atmospheric Characterization of the 1RXS J034231.8+121622 System using High-resolution Spectroscopy Confirms that the Companion is a Low-mass Star
Do Ó, Clarissa R.; Fitzgerald, Michael P.; López, Ronald A. +33 more
The 1RXS J034231.8+121622 system consists of an M dwarf primary and a directly imaged low-mass stellar companion. We use high-resolution spectroscopic data from Keck/KPIC to estimate the objects' atmospheric parameters and radial velocities (RVs). Using PHOENIX stellar models, we find that the primary has a temperature of 3460 ± 50 K and a metalli…
Non-radial oscillations mimicking a brown dwarf orbiting the cluster giant NGC 4349 No. 127
Reffert, Sabine; Quirrenbach, Andreas; Hunt, Emily L. +2 more
Context. Several evolved stars have been found to exhibit long-period radial velocity variations that cannot be explained by planetary or brown dwarf companions. Non-radial oscillations caused by oscillatory convective modes have been put forth as an alternative explanation, but no modeling attempt has yet been undertaken. Aims. We provide a model…