Search Publications
The evidence for unusually high hydrogen abundances in the central part of Valles Marineris on Mars
Mitrofanov, I.; Zelenyi, L.; Malakhov, A. +6 more
Studies of hydrogen deposition in the shallow Martian subsurface have been conducted by two neutron and one gamma-ray detectors in the past and provided global hydrogen maps (Boynton et al., 2002; Feldman et al., 2002; Mitrofanov et al., 2002). It is known from these maps that hydrogen is most abundant in the polar permafrost areas compared to the…
Relationship between Ca and Hα chromospheric emission in F-G-K stars: Indication of stellar filaments?
Kretzschmar, M.; Meunier, N.; Delfosse, X. +2 more
Context. Different relationships between the Hα and Ca II chromospheric emissions have been reported in solar-type stars. In particular, the time-series of emissions in these two lines are clearly anti-correlated for a few percent of the stars, contrary to what is observed on the Sun.
Aims: Our objective is to characterise these relationships…
The eROSITA Final Equatorial-Depth Survey (eFEDS). Variability catalogue and multi-epoch comparison
Schmitt, J. H. M. M.; Georgakakis, A.; Salvato, M. +10 more
The 140-square-degrees Final Equatorial-Depth Survey (eFEDS) field, observed with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma mission, provides a first look at the variable eROSITA sky. We analysed the intrinsic X-ray variability of the eFEDS sources and provide X-ray light curves and…
Bulge formation inside quiescent lopsided stellar disks: Connecting accretion, star formation, and morphological transformation in a z ∼ 3 galaxy group
Daddi, Emanuele; Pety, Jérôme; Tan, Qinghua +10 more
We present well-resolved near-IR and submillimeter analysis of the three highly star-forming massive (> 1011 M⊙) galaxies within the core of the RO-1001 galaxy group at z = 2.91. Each of them displays kpc scale compact starbursting cores with properties consistent with forming galaxy bulges, embedded at the center of exten…
MiMO: Mixture Model for Open Clusters in Color-Magnitude Diagrams
Li, Lu; Shao, Zhengyi
We propose a mixture model of open clusters (OCs) in color-magnitude diagrams (CMDs) to measure the OC properties, including isochrone parameters (age, distance, metallicity, and dust extinction), stellar mass function (MF), and binary parameters (binary fraction and mass-ratio distribution), with high precision and reliability. The model treats a…
A census of OBe stars in nearby metal-poor dwarf galaxies reveals a high fraction of extreme rotators
Lennon, D. J.; Schootemeijer, A.; Langer, N. +3 more
The early Universe, together with many nearby dwarf galaxies, is deficient in heavy elements. The evolution of massive stars in such environments is thought to be affected by rotation. Extreme rotators among them tend to form decretion disks and manifest themselves as OBe stars. We use a combination of UB, Gaia, Spitzer, and Hubble Space Telescope…
The eccentric millisecond pulsar, PSR J0955−6150. I. Pulse profile analysis, mass measurements, and constraints on binary evolution
Camilo, F.; Possenti, A.; Kramer, M. +17 more
Context. PSR J0955−6150 is a member of an enigmatic class of eccentric millisecond pulsar (MSP) and helium white dwarf (He WD) systems (eMSPs), whose binary evolution is poorly understood and believed to be strikingly different to that of traditional MSP+He WD systems in circular orbits.
Aims: Measuring the masses of the stars in this system …
Single-lens mass measurement in the high-magnification microlensing event Gaia19bld located in the Galactic disc
Harrison, D. L.; Bryden, G.; Soszyński, I. +66 more
Context. Microlensing provides a unique opportunity to detect non-luminous objects. In the rare cases that the Einstein radius θE and microlensing parallax πE can be measured, it is possible to determine the mass of the lens. With technological advances in both ground- and space-based observatories, astrometric and interferom…
Interstellar Neutrals, Pickup Ions, and Energetic Neutral Atoms Throughout the Heliosphere: Present Theory and Modeling Overview
Zank, Gary P.; Zhang, Ming; Mostafavi, Parisa +11 more
Interstellar neutrals (ISNs), pick-up ions (PUIs), and energetic neutral atoms (ENAs) are fundamental constituents of the heliosphere and its interaction with the neighboring interstellar medium. Here, we focus on selected aspects of present-day theory and modeling of these particles. In the last decades, progress in the understanding of the role …
Finding Quasars behind the Galactic Plane. II. Spectroscopic Identifications of 204 Quasars at ∣b∣ < 20°
Zheng, Jie; Jiang, Linhua; Feng, Xiaotong +21 more
Quasars behind the Galactic plane (GPQs) are important astrometric references and valuable probes of Galactic gas, yet the search for GPQs is difficult due to severe extinction and source crowding in the Galactic plane. In this paper, we present a sample of 204 spectroscopically confirmed GPQs at ∣b∣ < 20°, 191 of which are new discoveries. Thi…