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Complex network view to solar flare asymmetric activity
Taran, Somayeh; Khodakarami, Edris; Safari, Hossein
Asymmetric behavior of the solar hemispheres is an essential aspect of the activity. This paper uses a complex network approach to study the solar flare asymmetric activity in two hemispheres. We construct a network based on the locations and flare flux (GOES flux classification) from 2008 December to 2019 December for 4033 and 4725 flares on the …
Comparison of hydrostatic and lensing cluster mass estimates: A pilot study in MACS J0647.7+7015
Macías-Pérez, J. F.; Perotto, L.; Pointecouteau, E. +6 more
The detailed characterization of scaling laws relating the observables of a cluster of galaxies to their mass is crucial for obtaining accurate cosmological constraints with clusters. In this paper, we present a comparison between the hydrostatic and lensing mass profiles of the cluster MACS J0647.7+7015 at z = 0.59. The hydrostatic mass profile i…
Monitoring Inner Regions in the RY Tau Jet
Ohyama, Youichi; Currie, Thayne; Kwon, Jungmi +18 more
We present multiepoch observations of the RY Tau jet for Hα and [Fe II] 1.644 µm emission lines obtained with the Subaru Coronagraphic Extreme-AO and Visible Aperture Masking Polarimetric Imager for Resolved Exoplanetary Structures (VAMPIRES), Gemini Near-infrared Integral Field Spectrograph, and Keck/OSIRIS in 2019-2021. These data show a s…
Spectroscopic and imaging observations of transient hot and cool loops by IRIS and SDO
Gupta, Girjesh R.; Nayak, Sushree S.
Coronal loops are the basic building blocks of the solar atmosphere and are observed on various length scales. However, their formation mechanism is still unclear. In this paper, we present spectroscopic and imaging observations of small-scale transients and the subsequent formation of transient loops. For this purpose, we have utilized the multiw…
Calibrating the Cepheid Period-Wesenheit Relation in the Gaia Bands Using Galactic Open-cluster Cepheids
Xu, Ye; Liu, Dejian; Hao, Chaojie +3 more
Establishing the period-Wesenheit relation requires independent and accurate distance measurements of classical Cepheids (DCEPs). The precise distances provided by associated open clusters independently calibrate the period-Wesenheit relations of DCEPs. 51 DCEPs associated with open clusters are compiled using the constraints of five-dimensional a…
MeerKAT radio observations of the neutron star low-mass X-ray binary Cen X-4 at low accretion rates
Fender, R.; Miller-Jones, J. C. A.; van den Eijnden, J. +4 more
Centaurus X-4 (Cen X-4) is a relatively nearby neutron star low-mass X-ray binary that showed outbursts in 1969 and 1979, but has not shown a full outburst since. Due to its proximity and sustained period of quiescence, it is a prime target to study the coupling between accretion and jet ejection in quiescent neutron star low-mass X-ray binaries. …
Discovery of pulsating components in eclipsing binary systems through the TESS light curves: the cases of CPD-30 740, HD 97329, V1637 Ori and TYC 683-640-1
Ulaş, Burak; Ulusoy, Ceren; Erkan, Naci +2 more
We present the first evidence for the pulsations of primary components of four eclipsing binary systems. The TESS light curves of the targets are analyzed, the light and the absolute parameters are derived. Fourier analyses are applied to the residual data subtracted from the binary models to reveal the pulsational characteristics of the primaries…
Characterizing non-thermal equilibrium contact binaries
Wang, Z. H.; Zhu, L. Y.; Yuan, K.
Formation and evolution of marginal contact binaries with larger temperature difference between their two components remain inexplicable to date. To get a better understanding of the nature of such population we investigate on an individual, NSVS 7358116, by analysing observational data obtained from ground-based and space-based telescopes. It is …
A Comparative Study of Magnetic Flux Ropes in the Nightside Induced Magnetosphere of Mars and Venus
Harada, Yuki; Huang, Zesen; Luhmann, Janet G. +4 more
We analyzed Mars Atmosphere and Volatile Evolution (MAVEN) and Venus Express (VEX) data of magnetic flux ropes observed in both Mars and Venus nightside induced magnetosphere, in order to understand their statistical characteristics and possible formation processes. We statistically identified 382 (286) events at Mars (Venus) via the minimum varia…
On the trail of a comet's tail: A particle tracking algorithm for comet 67P/Churyumov-Gerasimenko
Agarwal, Jessica; Pfeifer, Marius; Schröter, Matthias
Context. During the post-perihelion phase of the European Space Agency's Rosetta mission to comet