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Polyphase tectonics on Mars: Insight from the Claritas Fossae
Tosi, Silvano; Balbi, Evandro; Ferretti, Gabriele +2 more
The Claritas Fossae (CF) is an elongated system of scarps and depressions >900 km long, representing the western boundary of the Thaumasia Region to the south of the Tharsis volcanic province. Although there is general agreement on the tectonic nature of such major physiographic feature, the processes that led to its formation are still debated…
The high-energy environment of the heavy sub-Earth GJ 367 b indicates likely complete evaporation of its atmosphere
Schmitt, J. H. M. M.; Robrade, J.; Schneider, P. C. +5 more
The planet GJ 367 b is a recently discovered high-density sub-Earth orbiting an M dwarf star. Its composition was modelled to be predominantly iron with a potential remainder of a hydrogen-helium envelope. Here we report an X-ray detection of this planet's host star for the first time, using data from the spectro-imaging X-ray telescope eROSITA on…
The HST Large Programme on ω Centauri. VI. The radial gradient of the stellar populations
Vesperini, E.; Scalco, M.; Bedin, L.
In this paper we present the analysis of Hubble Space Telescope (HST) observations of the globular cluster Omega Centauri. Our analysis combines data obtained in this work with previously published HST data from an earlier article of this series and encompasses a broad portion of the cluster's radial extension. Our findings reveal a significant ra…
Observed kinematics of the Milky Way nuclear stellar disk region
Zoccali, M.; Rojas-Arriagada, A.; Valenti, E. +3 more
Context. The nuclear region of the Milky Way, within approximately −1° < l < +1° and −0.3° < b < +0.3° (i.e., |l|< 150 pc, |b|< 45 pc), is believed to host a nuclear stellar disk, co-spatial with the gaseous central molecular zone. Previous kinematical studies detected faster rotation for the stars belonging to the nuclear stella…
A Data-driven Spectral Model of Main-sequence Stars in Gaia DR3
Bedell, Megan; Angelo, Isabel; Ness, Melissa +1 more
Precise spectroscopic classification of planet hosts is an important tool of exoplanet research at both the population and individual system level. In the era of large-scale surveys, data-driven methods offer an efficient approach to spectroscopic classification that leverages the fact that a subset of stars in any given survey has stellar propert…
WISDOM project - XVIII. Molecular gas distributions and kinematics of three megamaser galaxies
Greene, Jenny E.; Williams, Thomas G.; Cappellari, Michele +11 more
The co-evolution of galaxies and supermassive black holes (SMBHs) underpins our understanding of galaxy evolution, but different methods to measure SMBH masses have only infrequently been cross-checked. We attempt to identify targets to cross-check two of the most accurate methods, megamaser, and cold molecular gas dynamics. Three promising galaxi…
Photo-dynamical characterisation of the TOI-178 resonant chain. Exploring the robustness of transit-timing variations and radial velocity mass characterisations
Alonso, R.; Deleuil, M.; Erikson, A. +106 more
Context. The TOI-178 system consists of a nearby, late-K-dwarf with six transiting planets in the super-Earth to mini-Neptune regime, with radii ranging from to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All the planets, but the innermost one, form a chain of Laplace resonances. The fine-tuning and fragility of such orbital c…
Asymmetric Drift Map of the Milky Way Disk Populations between 8 -16 kpc with LAMOST and Gaia datasets
Yang, Peng; Wang, Hai-Feng; Li, Xin +4 more
The application of asymmetric drift (AD) tomography across different populations provides valuable insights into the kinematics, dynamics, and rotation curves of the Galactic disk. By leveraging common stars identified in both the LAMOST and Gaia surveys, alongside Gaia DR3's circular velocity curve, we conducted a qualitative exploration of asymm…
Study of the optical to X-ray broad emission lines of Mrk 110
Kriss, G. A.; Costantini, E.; Ebrero, J. +7 more
Aims: In order to shed light on the characteristics of the broad line region (BLR) in a narrow-line Seyfert 1 galaxy, we present an analysis of X-ray, UV, and optical spectroscopic observations of the broad emission lines in
Methods: For the broad-band modelling of the emission-line luminosity, we adopt the "l…
Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar
Scaringi, S.; Monageng, I. M.; Buckley, David A. H. +13 more
We report on optical follow-up observations of an X-ray source initially detected by the Einstein Probe mission. Our investigations categorize the source as an intermediate polar, a class of magnetic cataclysmic variables, exhibiting an orbital period of 3.7614(4) h and a white dwarf spin period of 3.97 min. The orbital period was identified throu…