Search Publications
Milky Way Dark Matter Distribution or MOND Test from Vertical Stellar Kinematics with Gaia DR3
López-Corredoira, Martín
Vertical stellar kinematics+density can be used to trace the dark matter distribution (or the equivalent phantom mass in a Modified Newtonian Dynamics (MOND) scenario) through the Jeans equations. In this paper, we want to improve this type of analysis by making use of the recent data of the 6D information from the Gaia DR3 survey in the anticente…
3D morphometry of Martian craters from HRSC DEMs using a multi-scale semantic segmentation network and morphological analysis
Tong, Xiaohua; Xu, Yusheng; Ye, Zhen +3 more
The morphology of impact craters reveals the structure and composition of the Martian surface, especially the subsurface conditions and Martian geological history, which have increasing importance in Mars exploration missions. This work presents a 3D morphometric method for detecting and delineating Martian craters, and a 3D morphological analysis…
SDSS J100711.74+193056.2: A Candidate Common Motion Substellar Companion to the Nearest B-type Star Regulus
Burgasser, Adam J.; Mamajek, Eric E.
The L9 dwarf SDSS J100711.74+193056.2 is situated 7
Stellar Streams Reveal the Mass Loss of Globular Clusters
Li, Hui; Chen, Yingtian; Gnedin, Oleg Y.
Globular cluster (GC) streams, debris of stars tidally stripped from their progenitor GCs, have densities that correlate positively with the GC mass-loss rate. In this work, we employ a novel particle spray algorithm that can accurately reproduce the morphology of streams of various orbital types, enabling us to uncover the relationship between th…
Physical characteristics of Jupiter's Trojan (1437) Diomedes from a tri-chord stellar occultation in 2020 and dimensionless three-dimensional model
Sicardy, B.; Gomes-Júnior, A. R.; Ortiz, J. L. +15 more
Jupiter Trojans preserve primitive formation characteristics owing to their collisionless, stable orbits. Determination of their shapes and size-frequency distribution helps constrain the collisional evolution of their parent population, which also originated the Kuiper Belt. We started a programme to find precise sizes/shapes for Trojans, combini…
ALMA Observations of Solar Spicules in a Polar Coronal Hole
Nindos, A.; White, S. M.; Shimojo, M. +2 more
We report observations of solar spicules at millimeter wavelengths (mm-λ) using the Atacama Large Millimeter/submillimeter Array (ALMA). These are supplemented by observations in optical, ultraviolet (UV), and extreme ultraviolet (EUV) wavelengths. The observations were made on 2018 December 25 of the northern polar coronal hole. ALMA obtained tim…
Contributions of `citizen science' to occultation astronomy
Beisker, Wolfgang; Guhl, Konrad; Midavaine, Thierry
The modern term `citizen science' describes a very old tradition in the natural sciences. Until the specialization of the sciences at the end of the eighteenth century, the emergence of technical universities and the formation of a modern scientific enterprise, citizen science was the norm. Since the 1960s, amateur astronomers have increasingly ob…
HD 60435: the star that stopped pulsating
Antoci, Victoria; Murphy, Simon J.; Hey, Daniel R. +10 more
HD 60435 is a well known rapidly oscillating (roAp) Ap star with a series of alternating even and odd degree modes, making it a prime asteroseismic target. It is also an oblique pulsator with rotational inclination, i, and magnetic/pulsation obliquity,
A UV to X-Ray View of Soft Excess in Type 1 Active Galactic Nuclei. I. Sample Selection and Spectral Profile
Kang, Jia-Lai; Cai, Zhen-Yi; Wang, Jun-Xian +5 more
A core sample of 59 unobscured type 1 active galactic nuclei (AGNs) with simultaneous XMM-Newton X-ray and UV observations is compiled from the archives to probe the nature of soft X-ray excess (SE). In the first paper of this series, our focus centers on scrutinizing the spectral profile of the soft excess. Of the sources, ≈71% (42/59) exhibit po…
Can Alfvénic Fluctuations Affect the Correlation and Complexity of Magnetic Field of Magnetic Ejecta? A Case Study Based on Multi-spacecraft Measurements at 1 au
Lugaz, Noé; Zhuang, Bin; Scolini, Camilla +4 more
We investigate whether Alfvénic fluctuations (AFs) can affect the structure of magnetic ejecta (ME) within interplanetary coronal mass ejections (ICMEs). We study an ICME observed on 2001 December 29 at 1 au by the Advanced Composition Explorer (ACE) and Wind, at a total angular separation of ~0