Search Publications
Timing analysis of a sample of five cataclysmic variable candidates observed by the XMM-Newton satellite
Nucita, A. A.; De Paolis, F.; Franco, A. +4 more
Intermediate polars are a class of cataclysmic variables in which a white dwarf accretes material from a companion star. The intermediate polar nature confirmation usually derives from the detection of two periods in both X-ray and optical photometry. In this respect, the high-energy signal is often characterized by modulations on the white dwarf …
MAVEN Proton Observations Near the Martian Moon Phobos: Does Phobos Backscatter Solar Wind Protons?
André, N.; Halekas, J. S.; Fowler, C. M. +7 more
ESA's Mars Express (MEX) may have observed twice solar wind protons backscattered by Phobos. However, these detections remain uncertain and call for an independent confirmation. Here, we analyze the proton measurements collected by the Suprathermal And Thermal Ion Composition experiment onboard NASA's Mars Atmosphere and Volatile EvolutioN mission…
Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE
Meisenheimer, K.; Augereau, J. -C.; Wolf, S. +50 more
Context. Asymptotic giant branch (AGB) stars are one of the main sources of dust production in the Galaxy. However, it is not yet clear what this process looks like and where the dust happens to be condensing in the circumstellar environment.
Aims: By characterizing the location of the dust and the molecules in the close environment of an AGB…
Discovery of a new supergiant fast X-ray transient MAXI J0709-159 associated with the Be star LY Canis Majoris
Liu, Zhu; Kawai, Nobuyuki; Shidatsu, Megumi +10 more
We report on the discovery of a new supergiant fast X-ray transient (SFXT), MAXI J0709-159, and its identification with LY CMa (also known as HD 54786). On 2022 January 25, a new flaring X-ray object, named MAXI J0709-159, was detected by the Monitor of All-sky X-ray Image (MAXI). Two flaring activities were observed in two scans ~3 hr apart, wher…
Impacts of thrusting, extensional faulting, and glaciation on cratering records of Pluto's largest moon Charon: Implications for the evolution of Kuiper belt objects
Yin, An; Chen, HanZhang
Systematic geomorphological mapping and detailed landform analysis using the highest resolution images obtained by the New Horizons spacecraft reveal the presence of a range of differentiable terrains on Charon, the largest moon of Pluto, that were not examined in detail by the early studies. The most important findings of our work include (1) tru…
X-Ray Emission from Candidate Stellar Merger Remnant TYC 2597-735-1 and Its Blue Ring Nebula
Hoadley, Keri; Schneider, P. C.; Günther, Maximilian N. +3 more
Tight binary or multiple-star systems can interact through mass transfer and follow vastly different evolutionary pathways than single stars. The star TYC 2597-735-1 is a candidate for a recent stellar merger remnant resulting from a coalescence of a low-mass companion with a primary star a few thousand years ago. This violent event is evident in …
Episodic and declining fluvial processes in Noctis Fossae, Syria Planum Province, Mars
Chavan, Anil; Sarkar, Subham; Bhandari, Subhash
The Noachian surfaces across Mars bear abundant evidence for aqueous processes; however, the transformation of the planet from warm and wet to the present-day cold and dry is unclear. A key question is whether these processes continued by the same or different magnitudes in the Hesperian and Amazonian times. The equatorial region of Mars has exten…
Magnetic Field Structure, Doppler Shift, and Intensity of Active Regions and Their Connections with the Solar Wind
Fu, Hui; Li, Bo; Xia, Lidong +4 more
The properties of active regions and their connections with the solar wind are important issues. In this study, nine isolated active regions near the solar disk center were chosen. The relationships between blueshift, intensity, magnetic concentrated areas (MCAs), and the potential-field source-surface (PFSS) open magnetic field of active regions …
Do All Low-Mass Stars Undergo Extra Mixing Processes?
Bania, T. M.; Balser, Dana S.; Wenger, Trey V.
Standard stellar evolution models that only consider convection as a physical process to mix material inside of stars predict the production of significant amounts of 3He in low-mass stars (M < 2 M ⊙), with peak abundances of 3He/H ~ few × 10-3 by number. Over the lifetime of the Galaxy, this ought to…
NGC 5236's stars as tracers of arms and arm widths in spiral galaxies
Silva-Villa, E.; Cano Gómez, X.
Generally, identifying the spiral arms of a spiral galaxy is not a hard task. However, defining the main characteristics, width, and length of those structure is not a common task. Previous studies have used different tracers: star clusters, massers, H α. It was until recently that individual stars were used as tracers of spiral structures. The ba…