Search Publications
The Radial Interplanetary Field Strength at Sunspot Minimum as Polar Field Proxy and Solar Cycle Predictor
Wang, Y. -M.
The minimum value of the geomagnetic aa index has served as a remarkably successful predictor of solar cycle amplitude. This value is reached near or just after sunspot minimum, when both the near-Earth solar wind speed and interplanetary magnetic field (IMF) strength fall to their lowest values. At this time, the heliospheric current sheet is fla…
Gaia DR3 reveals the complex dynamical evolution within star clusters
Miret-Roig, N.; Randich, S.; Alves, J. +6 more
Context. Star clusters, composed of stars born from the same molecular cloud, serve as invaluable natural laboratories for understanding the fundamental processes governing stellar formation and evolution. Aims. This study aims to investigate correlations between the Mean Interdistance (
Stellar X-Ray Activity and Habitability Revealed by the ROSAT Sky Survey
Liu, Jifeng; Wang, Song; Li, Xue +3 more
Using the homogeneous X-ray catalog from ROSAT observations, we conducted a comprehensive investigation into stellar X-ray activity–rotation relations for both single and binary stars. Generally, the relation for single stars consists of two distinct regions: a weak decay region, indicating a continued dependence of the magnetic dynamo on stellar …
Geologic History of Deuteronilus Cavus in the Ismenius Lacus Region, Mars
Head, James W.; Hiesinger, Harald; Wueller, Lukas +1 more
The Ismenius Lacus region of Mars has a diverse geological history, and we present the first high-resolution map of Deuteronilus Cavus (36.2°N; 14.0°E, ∼120 km diameter) in the fretted terrain south of the dichotomy boundary. Strong evidence suggests a volcanic origin of the regional plains, based on the ∼50 m thick volcanic bed underlying 180-300…
Pulsation in TESS Objects of Interest
Janot-Pacheco, E.; Ferreira Lopes, C. E.; De Medeiros, J. R. +11 more
We report the discovery of three Transiting Exoplanet Survey Satellite Objects of Interest (TOI) with signatures of pulsation, observed in more than one sector. Our main goal is to explore how large is the variety of classical pulsators such as δ Sct, γ Dor, RR Lyrae and Cepheid among TOI pulsators. The analysis reveals two stars with signatures o…
Composition and Mineralogy of Nuclei Material of Short Period Comets Revealed by Recent Spacecraft Missions
Engrand, Cecile; Nakamura, Tomoki; Zolensky, Michael +1 more
We summarize mineralogical and compositional results from lab and in-situ spacecraft investigations of samples of comets 81P/Wild 2 and 67P/Churyumov-Gerasimenko which provide constraints to early solar system evolution. Wild 2 cometary solids were mineralogically similar to anhydrous chondritic Interplanetary Dust Particles with the exception tha…
Compositional characterization of a primordial S-type asteroid family of the inner main belt
Fornasier, S.; Delbo, M.; Ochner, P. +4 more
Context. Recently, a primordial family of moderate-albedo asteroid fragments was discovered in the inner main belt. Its age was estimated to be 4.4 ± 1.7 Gyr. However, there is a lack of compositional characterization, which is important to the study of the earliest collisions in the main belt.
Aims: In addition to the previously identified m…
The Astrometric Performance of the China Space Station Telescope (CSST) Sky Survey in Extending the Gaia Celestial Reference Frame
Zhu, Zi; Yao, Jun; Liu, Niu +2 more
The multi-color imaging sky survey conducted by the China Space Station Telescope (CSST) holds significant promise for advancing the development of the celestial reference frame. In this study, we focus on assessing the astrometric performance of the CSST celestial reference frame (CSST-CRF) in extending the Gaia Celestial Reference Frame 3 (Gaia-…
He abundance in NGC 1850 A and B: Are we observing the early stage of the formation of multiple populations in a stellar cluster?
Biazzo, K.; Brocato, E.; Sollima, A. +1 more
We present the results for a sample of B stars in the Large Magellanic Cloud young double stellar cluster NGC 1850 A and NGC 1850 B, as observed with the integral-field spectrograph at the Very Large Telescope, the Multi Unit Spectroscopic Explorer (MUSE). We compare the observed equivalent widths (EWs) of four He lines (4922, 5015, 6678, and 7065…
Asymmetric Hard X-ray Radiation of Two Ribbons in a Thermal-Dominated C-Class Flare
Lei, Shijun; Feng, Li; Lu, Lei +26 more
The asymmetry in hard X-ray (HXR) emission at the footpoints (FPs) of flare loops is a ubiquitous feature closely associated with nonthermal electron transport. In this study, we analyze the asymmetric HXR radiation at two flare ribbons, which is thermal-dominated during a long-duration C4.4 flare that occurred on March 20, 2023, combining multi-v…