Research in Astronomy and Astrophysics

Journal Article

Transverse Velocity Field Measurements in High-resolution Solar Images Based on Deep Learning

Shang, Zhen-Hong; Mu, Si-Yu; Ji, Kai-Fan; Qiang, Zhen-Ping

2023 Research in Astronomy and Astrophysics

To address the problem of the low accuracy of transverse velocity field measurements for small targets in high-resolution solar images, we proposed a novel velocity field measurement method for high-resolution solar images based on PWCNet. This method transforms the transverse velocity field...

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Journal Article

Lyα Emission Enhancement Associated with Soft X-Ray Microflares

Tian, Zheng-Yuan; Feng, Li; Lu, Lei; Xia, Fan-Xiaoyu; Su, Yang;

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accc75

Lyα (Lyα, 1216 Å) is the strongest emission line in the solar ultraviolet spectrum. In the present work, we obtained a Lyα enhancement catalog covering flares larger than B1 class from the GOES/EUVS data during 2010–2016. We focused on the 242 B-class events which are less investigated, however,...

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Journal Article

Flare Forecast Model Based on DS-SMOTE and SVM with Optimized Regular Term

Wan, Jie; Fu, Jun-Feng; Wen, Ren-Qing; Han, Ke; Yu, Meng-Yao;

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accbb0

The research of flare forecast based on the machine learning algorithm is an important content of space science. In order to improve the reliability of the data-driven model and weaken the impact of imbalanced data set on its forecast performance, we proposes a resampling method suitable for...

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Journal Article

Effect of Orbital Characteristic of Inclined Third-body on Motion of Secondary-body for a Hierarchical Triple Systems

Bakhtiari, Majid

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/acc91a

The influence of a third-body’s orbital elements on the second-body’s motion in a hierarchical triple system is a crucial problem in astrophysics. Most prolonged evaluation studies have focused on a distant zero-inclined third-body. This study presents a new perspective on second-body motion...

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Journal Article

LISC Catalog of Open Clusters III. 83 Newly Found Galactic Disk Open Clusters Using Gaia EDR3

Chi, Huanbin; Wang, Feng; Li, Zhongmu

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accbad

As groups of coeval stars born from the same molecular cloud, an open cluster (OC) is an ideal laboratory for studying the structure and dynamical evolution of the Milky Way. The release of high-precision Gaia Early Data Release 3 (Gaia EDR3) and modern machine-learning methods offer...

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Journal Article

Relation between Mass and Radius of Exoplanets Distinguished by their Density

Betzler, Alberto S.; Miranda, José G. V.

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accbb1

The formation of the solar system has been studied since the 18th century and received a boost in 1995 with the discovery of the first exoplanet, 51 Pegasi b. The investigations increased the number of confirmed planets to about 5400 to date. The possible internal structure and composition of...

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Journal Article

Neutrino Mass Constraints from Reconstructing the Large-scale Structure: Systematic Uncertainty

Chung, Chok Lap; Inman, Derek; Wang, Xin; Shang, Erhao; Zhuang, Zi;

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accb7c

We examine the possibility of applying the baryonic acoustic oscillation reconstruction method to improve the neutrino mass Σmνconstraint. Thanks to the Gaussianization of the process, we demonstrate that the reconstruction algorithm could improve the measurement accuracy by roughly a factor of...

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Journal Article

The H i Gas Fraction Scaling Relation of the Green Pea Galaxies

Liu, Siqi; Luo, A-Li; Zhang, Wei; Zhang, Yan-Xia; Kong, Xiao;

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accb78

Green Pea galaxies are compact galaxies with high star formation rates. However, limited samples of Green Pea galaxies have H i 21 cm measurements. Whether the H i gas fraction (fH I ≡ MH I/M⋆) of Green Pea galaxies follows the existing scaling relations between the fH I and NUV-r color or linear...

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Journal Article

Detection of TiO and VO in the Atmosphere of WASP-121b and Evidence For its Temporal Variation

Ouyang, Qinglin; Wang, Wei; Zhai, Meng; Chen, Guo; Rojo, Patricio;

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accbb2

We report the transit observations of the ultra-hot Jupiter WASP-121b using the Goodman High Throughput Spectrograph at the 4 m ground-based Southern Astrophysical Research Telescope, covering the wavelength range 502–900 nm. By dividing the target and reference star into 19 spectroscopic...

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Journal Article

A Study of Holographic Dark Energy Models with Configuration Entropy

Das, Biswajit; Pandey, Biswajit

2023 Research in Astronomy and Astrophysics

doi:10.1088/1674-4527/accb77

The holographic dark energy models provide an alternative description of dark energy. These models are motivated by the possible application of the holographic principle to the dark energy problem. In this work, we present a theoretical study of the one parameter Li holographic dark energy and...

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