Search Publications
Terrestrial and Martian space weather: A complex systems approach
Blanco-Cano, Xóchitl; Stepanova, Marina; Mazelle, Christian +19 more
A comparative overview of Terrestrial and Martian space weather is presented, with emphasis on applying the tools of complexity and nonlinear dynamics to study the spatiotemporal dynamics and structures of sun–Earth and sun–Mars space environment. The following topics are reviewed: (1) complex systems approach to solar atmosphere and solar wind; (…
Identification and Distance Measurement of Dust Clouds at High Latitude by a Clustering Hierarchical Algorithm
Jiang, Biwei; Cui, Wenyuan; Sun, Mingxu +1 more
We present a catalog of dust clouds at high Galactic latitude based on the Planck 857 GHz dust emission data. Using a clustering hierarchical algorithm, 315 dust clouds at high Galactic latitudes are identified. Additionally, using the optical and ultraviolet extinction of 4 million and 1 million stars, respectively, provided by Sun et al., we der…
Combining magneto-hydrostatic constraints with Stokes profile inversions. IV. Imposing ∇⋅B = 0 condition
Pastor Yabar, A.; Ruiz Cobo, B.; Borrero, J. M.
Context. Inferences of the magnetic field in the solar atmosphere by means of spectropolarimetric inversions (i.e., Stokes inversion codes) yield magnetic fields that are non-solenoidal (∇ ⋅ B ≠ 0). Because of this, results obtained by such methods are sometimes put into question.
Aims: We aim to develop and implement a new technique that, in…
Low abundances of TiO and VO on the dayside of KELT-9 b: Insights from ground-based photometric observations
Ikuta, Kai; Fukui, Akihiko; Narita, Norio +21 more
We present ground-based photometric observations of secondary eclipses of the hottest known planet KELT-9 b using MuSCAT2 and Sinistro. We detect secondary eclipse signals in i and
High-accuracy polarization measurements of the white-light corona during the 2023 total solar eclipse
Hanaoka, Yoichiro; Sakai, Yoshiaki; Masuda, Yukio
This study measured the polarization of the white-light corona during the total solar eclipse on 20 April 2023, which occurred under high solar activity. The same instrument that was used for the 2017 and 2019 eclipse observations was employed, and despite the short duration of totality, the obtained data could be used for high-accuracy polarizati…
Constraints on Testing Post-Newtonian Gravity with Scanning Space Astrometry
Bucciarelli, Beatrice; Lattanzi, Mario G.; Crosta, Mariateresa +4 more
High-precision astrometry has the capability of testing General Relativity in the framework of the parametrized post-Newtonian formalism (PPN). Accurate measurements of gravitational light deflection over the entire celestial sphere open up a potential opportunity for determining the post-Newtonian parameter γ, which governs the deflection strengt…
The VANDELS Survey: Star formation and quenching in two over-densities at 3 < z < 4
Demarco, R.; Castellano, M.; Pentericci, L. +11 more
Context. Exploring galaxy evolution in dense environments, such as proto-clusters, is pivotal for understanding the mechanisms that drive star formation and the quenching of star formation. Aims. This study provides insights into how two over-densities could have impacted the physical properties, such as the star formation rate, stellar mass, morp…
Sifting the debris: Patterns in the SNR population with unsupervised ML methods
Umana, G.; Sciacca, E.; Loru, S. +13 more
Context. Supernova remnants (SNRs) carry vast amounts of mechanical and radiative energy that heavily influence the structural, dynamical, and chemical evolution of galaxies. To this day, more than 300 SNRs have been discovered in the Milky Way, exhibiting a wide variety of observational features. However, existing classification schemes are mainl…
Recurrent Coronal Mass Ejections and Their Geomagnetic Storms Association on 2012 January 19: Solar Surface to Upper Earth's Atmosphere Analyses
Minta, F. N.; Hassanin, A.; Shimeis, Amira +1 more
In this study, we have conducted an analysis of space weather disruptions that occurred on 19 January 2012. Our analysis identified three coronal mass ejections (CMEs), CME1, CME2, and CME3—which were ejected at 09:48:05 universal time (UT), 14:36:05 UT, and 16:12:06 UT, respectively. Nonrecurrent disturbances in space weather, such as geomagnetic…
Variable Stars in the 50BiN Open Cluster Survey. III. NGC 884
Deng, Li-Cai; Wang, Kun; Zhang, Xiao-Bin +5 more
Open clusters are the basic building blocks that serve as a laboratory for the study of young stellar populations in the Milky Way. Variable stars in open clusters provide a unique way to accurately probe the internal structure, temporal and dynamical evolutionary stages of individual stars and the host cluster. The most powerful tool for such stu…