Search Publications
Missions
Journals
Publication Years
Wave Mode Occurrence Distribution Around Venus: A VEX Statistical Study
Fraenz, Markus; Echer, Ezequiel; Marques de Souza Franco, Adriane +3 more
In this work, plasma and magnetic field data from Venus Express (VEX) were analyzed through the entire mission span (2006-2014) in order to statistically study wave mode occurrence around Venus considering different solar wind conditions. The wave mode occurrence distribution in terms of solar activity (maxima and minimum periods), solar wind pres…
Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge
Goldman, Steven R.; Blommaert, Joris A. D. L.; van Loon, Jacco Th. +2 more
We have detected the 10 µm silicate feature and the 11.3 µm crystalline forsterite feature in absorption in 21 oxygen-rich asymptotic giant branch stars in the Galactic bulge. The depths of the 10 µm feature indicate highly obscured circumstellar environments. The additional crystalline features may suggest either an extended env…
Ground-based Characterization of (98943) Torifune 2001 CC21, the Target of the Hayabusa2# Space Mission
Tatsumi, Eri; de León, Julia; Licandro, Javier +11 more
The near-Earth asteroid (98943) Torifune, previously designated 2001 CC21, is the flyby target of the Hayabusa2 extended mission, nicknamed Hayabusa2# (Small Hazardous Asteroid Reconnaissance Probe (SHARP)). The ground-based telescope observations offer a key science input for the mission's scientific investigation. During 2022–2024, th…
Correlation of long-term optical color variability of radio-loud quasars with their VLBI astrometric characteristics
Makarov, V. V.; Lambert, S.; Medouni, A. +1 more
Aims. The International Celestial Reference Frame (ICRF) is realized through geodetic very long baseline interferometry (VLBI) positions of thousands of extragalactic objects, mainly radio-loud active galactic nuclei. As previous studies have suggested a link between the optical variability of these sources and optical-radio position offsets and v…
Unraveling the Kinematic and Morphological Evolution of the Small Magellanic Cloud
Subramanian, S.; Subramaniam, A.; Dhanush, S. R.
We model the kinematics of the Small Magellanic Cloud (SMC) by analyzing the proper motions (PMs) from Gaia DR3 of nine different stellar populations, including young main-sequence (MS) stars (<2 Gyr), red giant branch stars, red clump stars, red giants with line-of-sight velocities, and three groups of star clusters. This analysis is carried o…
Improved bounds on collapse models from rotational noise of the Laser Interferometer Space Antenna Pathfinder mission
Carlesso, Matteo; Vinante, Andrea; Altamura, Davide Giordano Ario
We study spontaneous wave-function collapse models, which modify the Schrödinger equation with nonlinear and stochastic terms offering a solution to the quantum measurement problem. We find that constraints on the phenomenological parameters of the continuous spontaneous localization (CSL) model can be tightened using the recent analysis of the La…
A multi-technique detection of an eccentric giant planet around the accelerating star HD 57625
Ertel, S.; Henning, Th.; Sozzetti, A. +42 more
Context. The synergy between different detection methods is a key asset in exoplanetology that allows the precise characterization of detected exoplanets and robust constraints even in the case of a non-detection. The interplay between imaging, radial velocities and astrometry has recently produced significant advancements in exoplanetary science.…
The NuSTAR view of five changing-look active galactic nuclei
Liu, Hao; Wu, Qingwen; Lyu, Bing +3 more
Changing-look active galactic nuclei (CLAGNs) are known to change their spectral type between 1 and 2 (changing-state) or change their absorption between Compton-thick and Compton-thin (changing-obscuration) on time-scales of years or less. The physical mechanism and possible connection between the two types of CLAGNs are still unclear. We explore…
Signature of a Seyfert-like Component in Blazar 3C 273 and Its Reflection-based Explanation
Gaur, Haritma; Pal, Main; Anjum, Muhammad S. +4 more
We present the results of blazar 3C 273 from simultaneous observations obtained using the XMM-Newton and NuSTAR satellites during the period 2015–2019 in five epochs. When the spectra are modeled with a power law, significant residuals arise below ∼2 keV and in the energy range of 30–78 keV in NuSTAR data. Residuals in the lower energy band repres…
Best of both worlds: Fusing hyperspectral data from two generations of spectro-imagers for X-ray astrophysics
Bobin, J.; Acero, F.; Lascar, J.
Context. With the recent launch of the X-Ray Imaging and Spectroscopy Mission (XRISM) and the advent of microcalorimeter detectors, X-ray astrophysics is entering in a new era of spatially resolved high-resolution spectroscopy. But while this new generation of X-ray telescopes offers much finer spectral resolution than the previous one (e.g. XMM-N…