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Element abundances of galactic RGB stars in the APO-K2 catalogue: Dissimilarity in the scaling with [α/Fe]
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +1 more
Aims. We conducted an investigation on the chemical abundances of 4316 stars in the red giant branch (RGB) phase from the recently released APO-K2 catalogue. Our aim was to characterize the abundance trends of the single elements with [α/Fe], mainly focusing on C, N, and O, which are the most relevant for the estimation of stellar ages. Methods. T…
A patchy CO2 exosphere on Ganymede revealed by the James Webb Space Telescope
Leblanc, François; de Pater, Imke; Wong, Michael H. +25 more
Jupiter's icy moon Ganymede has a tenuous exosphere produced by sputtering and possibly sublimation of water ice. To date, only atomic hydrogen and oxygen have been directly detected in this exosphere. Here, we present observations of Ganymede's CO2 exosphere obtained with the James Webb Space Telescope. CO2 gas is observed o…
Geological Record of Water and Wind Processes on Mars as Observed by the Mars Express High Resolution Stereo Camera
Jaumann, R.; Tirsch, D.; Hiesinger, H. +9 more
This review paper summarizes the observations and results of the Mars Express Mission and its application in the analysis of geological processes and landforms on Mars during the last 20 years. The Mars Express observations provided an extended data base allowing a comparative evaluation of different geological surface landforms and their time-bas…
Closeby Habitable Exoplanet Survey (CHES). II. An Observation Strategy for the Target Stars
Zhu, Zi; Li, Dong; Chen, Guo +11 more
The Closeby Habitable Exoplanet Survey (CHES) constitutes a mission intricately designed to systematically survey approximately 100 solar-type stars located within the immediate proximity of the solar system, specifically within a range of 10 pc. The core objective of this mission is the detection and characterization of potentially habitable Eart…
Relative alignments between magnetic fields, velocity gradients, and dust emission gradients in NGC 1333
Pattle, Kate; Karoly, Janik; Bastien, Pierre +24 more
Magnetic fields play an important role in shaping and regulating star formation in molecular clouds. Here, we present one of the first studies examining the relative orientations between magnetic (B) fields and the dust emission, gas column density, and velocity centroid gradients on the 0.02 pc (core) scales, using the BISTRO and VLA+GBT observat…
Detection of Faint Sources by the UltraViolet Imaging Telescope Onboard AstroSat Using Poisson Distribution of Background
Sreekumar, P.; Ananthamoorthy, B.; Bhattacharya, Debbijoy +1 more
We present an improved approach for constructing the UV source catalogs using observations from the UltraViolet Imaging Telescope (UVIT) onboard AstroSat, by considering the Poisson distribution of the UV background. The method is tested extensively using fields that are not crowded, the Small Magellanic Cloud and M31 (Field 13). The results are c…
Determining the dynamical age of the LMC globular cluster NGC 1835 using the `dynamical clock'. Star density profile and blue straggler stars
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +5 more
In the context of the study of the size-age relationship observed in star clusters in the Large Magellanic Cloud (LMC) and the investigation of its origin, we present the determination of the structural parameters and the dynamical age of the massive cluster NGC 1835. We used the powerful combination of optical and near-ultraviolet images acquired…
First Results of Mars Express—ExoMars Trace Gas Orbiter Mutual Radio Occultation
Cardesín-Moinelo, Alejandro; Wilson, Colin; Witasse, Olivier +10 more
Spacecraft-to-spacecraft radio occultations experiments are being conducted at Mars between Mars Express (MEX) and Trace Gas Orbiter (TGO), the first ever extensive inter-spacecraft occultations at a planet other than Earth. Here we present results from the first 83 such occultations, conducted between 2 Nov 2020 and 5th of July 2023. Of these, 44…
First detection of X-ray pulsations and spectrum of the high Galactic latitude pulsar PSR J0837–2454 and direct Urca cooling implications
Deller, Adam T.; Ho, Wynn C. G.; Becker, Werner +2 more
PSR J0837
Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag
Melandri, A.; Maccarone, T. J.; Altamirano, D. +16 more
We report two epochs of simultaneous near-infrared (IR) and X-ray observations of the low-mass X-ray binary black hole candidate Swift J1753.5–0127 with a subsecond time resolution during its long 2005–2016 outburst. Data were collected strictly simultaneously with VLT/ISAAC (KS band, 2.2 µm) and RXTE (2–15 keV) or XMM-Newton (0.7…