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Exploring the chemodynamics of metal-poor stellar populations
Smiljanic, R.; da Silva, A. R.
Context. Metal-poor stars are key for studying the formation and evolution of the Galaxy. Evidence of the early mergers that built up the Galaxy remains in the distributions of abundances, kinematics, and orbital parameters of its stars. Several substructures resulting from these mergers have been tentatively identified in the literature.
Aim…
Observing Atmospheric Escape in Sub-Jovian Worlds with JWST
Alam, Munazza K.; Espinoza, Néstor; Dos Santos, Leonardo A. +1 more
Hydrodynamic atmospheric escape is considered an important process that shapes the evolution of sub-Jovian exoplanets, particularly those with short orbital periods. The metastable He line in the near-infrared at 1.083 µm is a reliable tracer of atmospheric escape in hot exoplanets, with the advantage of being observable from the ground. How…
Precise masses and ages of 1 million RGB and RC stars observed by LAMOST
Huang, Yang; Zhang, Huawei; Wang, Chun +1 more
We construct a catalogue of stellar masses and ages for 696 680 red giant branch (RGB) stars, 180 436 primary red clump (RC) stars, and 120 907 secondary RC stars selected from the LAMOSTDR8. The RGBs, primary RCs, and secondary RCs are identified with the large frequency spacing (∆ν) and period spacing (∆P) estimated from the LAMOST spectra with …
The outburst of the changing-look AGN IRAS 23226-3843 in 2019
Schartel, N.; Komossa, S.; Kollatschny, W. +8 more
Aims: IRAS 23226-3843 has previously been classified as a changing-look active galactic nucleus (AGN) based on observations taken in the 1990s in comparison to X-ray data (Swift, XMM-Newton, and NuSTAR) and optical spectra taken after a very strong X-ray decline in 2017. In 2019, Swift observations revealed a strong rebrightening in X-ray and…
Water Vapor Vertical Distribution on Mars During Perihelion Season of MY 34 and MY 35 With ExoMars-TGO/NOMAD Observations
Aoki, S.; Vandaele, A. C.; Daerden, F. +18 more
The water vapor in the Martian atmosphere plays a significant role in the planet's climate, being crucial in most of the chemical and radiative transfer processes. Despite its importance, the vertical distribution of H2O in the atmosphere has not still been characterized precisely enough. The recent ExoMars Trace Gas Orbiter mission, wi…
Backstreaming ions at a high Mach number interplanetary shock. Solar Orbiter measurements during the nominal mission phase
Vainio, R.; Owen, C. J.; Wimmer-Schweingruber, R. F. +9 more
Context. Solar Orbiter, a mission developed by the European Space Agency, explores in situ plasma across the inner heliosphere while providing remote-sensing observations of the Sun. The mission aims to study the solar wind, but also transient structures such as interplanetary coronal mass ejections and stream interaction regions. These structures…
Surface structure of 45 Hercules: an otherwise unremarkable Ap star with a surprisingly weak magnetic field
Petit, P.; Amarsi, A. M.; Kochukhov, O. +3 more
The origin of magnetic fields and their role in chemical spot formation on magnetic Ap stars is currently not understood. Here, we contribute to solving this problem with a detailed observational characterization of the surface structure of 45 Her, a weak-field Ap star. We find this object to be a long-period, single-lined spectroscopic binary and…
Col-OSSOS: The Two Types of Kuiper Belt Surfaces
Marsset, Michaël; Fraser, Wesley C.; Pike, Rosemary E. +12 more
The Colors of the Outer Solar System Origins Survey (Col-OSSOS) has gathered a high-quality, near-simultaneous, and brightness-complete sample of (g - r) and (r - J) colors for 102 Kuiper Belt objects (KBOs) with (u - g) and (r - z) gathered for some. We present the current state of the survey and data analysis. Recognizing that the optical colors…
Dust Properties of 870 µm-selected Galaxies in GOODS-S
Bauer, F. E.; Barger, A. J.; Cowie, L. L. +2 more
We analyze the dust properties of 57 870 µm-selected dusty star-forming galaxies in GOODS-S using new deep Atacama Large Millimeter/Submillimeter Array 1.2, 2, and 3 mm continuum imaging together with other far-infrared through millimeter data. We fit the spectral energy distributions (SEDs) with optically thin modified blackbodies to constr…
Combining HIPPARCOS and Gaia data for the study of binaries: The BINARYS tool
Arenou, F.; Babusiaux, C.; van Leeuwen, F. +6 more
Context. Orbital motion in binary and planetary systems is the main source of precise stellar and planetary mass measurements, and the joint analysis of data obtained using multiple observational methods can both lift degeneracies and improve precision.
Aims: We set out to measure the masses of individual stars in binary systems using all the…