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Shallow Water Ice Detection From SHARAD Data in Central Utopia Planitia, Mars
Bugiolacchi, Roberto; Xu, Xiaoting; Xu, Yi +5 more
One of the key scientific goals of China's first Mars mission Tianwen-1 is to search for ground ice. This study focuses on investigating potential water ice reservoirs in the vicinity of the landing site of the Zhurong rover to provide geological context and references for data interpretation. Our study area is centered on Utopia Planitia (UP), wh…
A comprehensive photometric and spectroscopic study of B-type stars in the open cluster NGC 6834
Baume, G.; Granada, A.; Aidelman, Y. J. +1 more
This study focuses on the open cluster NGC 6834. Despite being well-known, its primary parameters show considerable variation. As an intermediate-age cluster (50-80 million years), it is expected to host a prominent population of B-type stars, including numerous Be stars. Fifteen B-type variable stars have already been identified in the vicinity o…
Disentangling stellar atmospheric parameters in astronomical spectra using generative adversarial neural networks: Application to Gaia/RVS parameterisation
Álvarez, M. A.; Dafonte, C.; Manteiga, M. +4 more
Context. The rapid expansion of large-scale spectroscopic surveys has highlighted the need to use automatic methods to extract information about the properties of stars with the greatest efficiency and accuracy, and also to optimise the use of computational resources. Aims. We developed a method based on generative adversarial networks (GANs) to d…
A Case Study on the Impact of Interplanetary Coronal Mass Ejection on the Martian O(1S) 557.7 nm Dayglow Emission Using ExoMars TGO/NOMAD-UVIS Observations: First Results
Vandaele, Ann Carine; Gérard, Jean-Claude; Thomas, Ian R. +6 more
We report, for the first time, the impact of interplanetary coronal mass ejections (ICME) on the recently discovered O(1S) 557.7 nm dayglow emission in the Martian atmosphere. While there are a few studies on the seasonal variation of 557.7 nm dayglow emission available in the literature, the impact of ICME has not been investigated so …
DECaPS and SMA Discovery of a Highly Inclined Class I Young Stellar Object with an Outflow: IRAS 08235–4316
Wilner, David J.; Rao, Ramprasad; Edenhofer, Gordian +4 more
We present images of IRAS 08235–4316 with the Dark Energy Camera Plane Survey (DECaPS; spanning 0.398–1.034 µm, at ∼1″ resolution) and the Submillimeter Array (SMA; at 1.38 mm (217 GHz) and ∼1
Search for and Analysis of Eclipsing Binaries in the LAMOST Medium-resolution Survey Field. I. R.A.: 23h01m51s, Decl.: +34°36'45″
Guo, Ya-Ni; Li, Kai; Gao, Xing +7 more
Eclipsing binaries (EBs) play an important astrophysical role in studying stellar properties and evolution. By analyzing photometric data in the the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Medium-Resolution Survey field, R.A.: 23h01m51
Modeling of comet water production: I. Sensitivity to macro- and micro-model parameters
Küppers, M.; Hartogh, P.; Rezac, L. +3 more
Aims. This study investigates the impact of microscopic and macroscopic cometary surface properties on water production variations with heliocentric distance, focusing on dust layer thickness, grain size, nucleus shape, and spin axis orientation. Methods. We employed a two-layer thermophysical model to calculate effective gas production, incorpora…
The Guitar Filament's Magnetic Field Revealed by Starlight Polarization
Liodakis, Ioannis; Romani, Roger W.; Dinsmore, Jack T. +2 more
The Guitar nebula surrounding PSR B2224+65 boasts a pulsar X-ray filament likely aligned with the local magnetic field. We present new RoboPol stellar polarization data distributed along the line of sight to the pulsar. The polarizing effect of intervening magnetized dust allows us to extract a model for the dust-weighted magnetic field. We detect…
A global colour mosaic of Mars from Mars Express HRSC high altitude observations
Jaumann, R.; Postberg, F.; Matz, K. -D. +8 more
The ever-changing transparency of the Martian atmosphere hinders the determination of absolute surface colour from spacecraft images. While individual high-resolution images from low orbit reveal numerous colour details of the geology, the colour variation between images caused by scattering off atmospheric dust can easily be of greater magnitude.…
Electron and proton peak intensities as observed by a five-spacecraft fleet in solar cycle 25
Vainio, R.; Farwa, G. U.; Dresing, N. +9 more
Context. Solar energetic particle (SEP) events are related to solar flares and fast coronal mass ejections (CMEs). In the case of large events, which are typically associated with both a strong flare and a fast CME driving a shock front, identification of the dominant SEP acceleration mechanism is challenging. Aims. Using novel spacecraft observat…