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A sample of 554 white dwarfs showing infrared excess from Gaia EDR3 and CatWISE catalogs
Xu, Siyi; Kissler-Patig, Markus; Bonsor, Amy +1 more
Context. White dwarfs (WDs) are generally intrinsically faint in the infrared (IR). Excess emission in the infrared results from low-mass companions or dusty material, potentially linked to the on-going accretion of planetary material.
Aims: This work presents a new catalog of white dwarfs with (candidate) infrared excess.
Methods: The f…
Parsec-scale evolution of the gigahertz-peaked spectrum quasar PKS 0858 - 279
Kovalev, Y. Y.; Perucho, M.; Kosogorov, N. A. +1 more
We conducted multi-epoch, multifrequency parsec-scale studies on the gigahertz-peaked spectrum quasar PKS 0858 - 279 with the Very Long Baseline Array (VLBA). Our observations on 2005 November 26 elucidated a weak core, characterized by an inverted spectrum, and a distinctly bent jet that exhibited a notable bright feature in its Stokes I emission…
Advancements in the 3D shape reconstruction of Phobos: An analysis of shape models and future exploration directions
Willner, Konrad; Chen, Min; Huang, Xianfeng +4 more
Aims: Our research focuses on developing a high-precision and relatively high-resolution shape model of Phobos.
Methods: We employed advanced photogrammetric techniques combined with novel computer vision methods to reconstruct the 3D shape of Phobos from nearly 900 Mars Express/SRC and Viking Orbiter images. This research also involved …
Correlations between IR Luminosity, Star Formation Rate, and CO Luminosity in the Local Universe
De Zotti, Gianfranco; Bianchi, Simone; Casasola, Viviana +5 more
We exploit the DustPedia sample of galaxies within approximately 40 Mpc, selecting 388 sources, to investigate the correlations between IR luminosity (LIR), the star formation rate (SFR), and the CO(1-0) luminosity (LCO) down to much lower luminosities than reached by previous analyses. We find a sub-linear dependence of the …
The Polar Stratosphere of Jupiter
Zhang, X.; Johnson, R. E.; Hueso, R. +13 more
Observations of the Jovian upper atmosphere at high latitudes in the UV, IR and mm/sub-mm all indicate that the chemical distributions and thermal structure are broadly influenced by auroral particle precipitations. Mid-IR and UV observations have shown that several light hydrocarbons (up to 6 carbon atoms) have altered abundances near Jupiter's m…
First photometric study of W UMa-type binary systems: BK Vul and V699 Cep
Soydugan, E.; Adalalı, S.
In this study, new CCD photometric observations and photometric analysis of BK Vul and V699 Cep systems, which are classified as contact binaries in the literature, are presented. For the V699 Cep, the TESS light curve was also used in the photometric analysis. We determined the basic astrophysical parameters of the BK Vul and V699 Cep systems fro…
The hydrology of the Jezero crater paleolake: Implications for the climate and limnology of the lake system from hydrological modeling
Horvath, David G.; Andrews-Hanna, Jeffrey C.
The lake stages in Jezero are consistent with semiarid climates The Jezero lake was a throughflow lake driven by significant surface runoff Hydrological conditions do not favor large-scale evaporite deposition Similar climates at Jezero and Gale produce contrasting lacustrine environments
Gaia (DR3)-based astronomical analysis of the seven unstudied open star clusters
Tadross, A. L.; Badawy, W. A.; Hendy, Y. H. M. +2 more
The seven open star clusters FSR 0717, FSR 1698, Loden 2313, Ruprecht 49, Majaess 61, Mayer 2, and Teutsch 48, which are located near the Milky Way's Galactic plane are studied in this article using the Gaia DR3 dataset. The estimated numbers of potential cluster members are 102, 362, 285, 197, 95, 116, 160, and 397, correspondingly. The calculate…
Subaru/CHARIS High-resolution Mode Spectroscopy of the Brown Dwarf Companion HD 33632 Ab
Jensen-Clem, Rebecca; Lewis, Briley L.; Fitzgerald, Michael P. +6 more
Brown dwarfs (BDs) are model degenerate in age and mass. High-contrast imaging and spectroscopy of BD companions to host stars where the mass and age can be independently constrained by dynamics and stellar age indicators, respectively, provide valuable tests of BD evolution models. In this paper, we present a new epoch of Subaru/CHARIS H- and K-b…
Secular aberration drift in stellar proper motions. An additional term due to the change in line-of-sight direction
Liu, N.; Zhu, Z.; Liu, J. -C.
Context. The motion of the Solar System barycenter (SSB), the spatial origin of the International Celestial Reference System, causes a directional displacement known as secular aberration. The secular aberration drift caused by the galactocentric acceleration of the SSB has been modeled in the third generation of the International Celestial Refere…