Search Publications
Chemical Evolution of R-process Elements in Stars (CERES): II. The impact of stellar evolution and rotation on light and heavy elements
Hansen, Camilla Juul; Meynet, Georges; Romano, Donatella +4 more
Context. Carbon, nitrogen, and oxygen are the most abundant elements throughout the universe, after hydrogen and helium. Studying these elements in low-metallicity stars can provide crucial information on the chemical composition in the early Galaxy and possible internal mixing processes that can alter the surface composition of the stars. Aims. T…
Climatology and Diurnal Variation of Ozone Column Abundances for 2.5 Mars Years as Measured by the NOMAD-UVIS Spectrometer
Vandaele, A. C.; Daerden, F.; Ristic, B. +14 more
The distribution of Mars ozone (O3) is well established; however, our knowledge on the dayside diurnal variation of O3 is limited. We present measurements of Mars O3 column abundances, spanning Mars Year (MY) 34 to the end of MY 36, by the Ultraviolet and VIsible Spectrometer (UVIS), part of the Nadir and Occultati…
Erratum: "Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3" (2024, ApJS, 271, 26)
Huang, Yang; Beers, Timothy C.; Yuan, Haibo +5 more
We combine photometric data from GALEX GR6+7 AIS and Gaia EDR3 with stellar parameters from the SAGA and PASTEL catalogs to construct high-quality training samples for dwarfs ($\rm 0.4< BP-RP<1.6$) and giants ($\rm 0.6< BP-RP <1.6$). We apply careful reddening corrections using empirical temperature- and extinction-dependent extinction…
Solar Wind Density and Core Temperature Derived from the PSP Quasi-thermal Noise Measurements
Liu, Mingzhe; Liu, Kaijun; Pierrard, Viviane +6 more
Quasi-thermal noise (QTN) spectroscopy is a valuable method to deduce important parameters in space plasma, such as plasma density and temperature, especially when direct particle measurements are not available. The present study develops a new fitting method to fit the QTN spectra observed by the Parker Solar Probe (PSP) with a comprehensive theo…
Eta-Earth Revisited II: Deriving a Maximum Number of Earth-Like Habitats in the Galactic Disk
Lammer, Helmut; Scherf, Manuel; Spross, Laurenz
In Lammer et al. (2024), we defined Earth-like habitats (EHs) as rocky exoplanets within the habitable zone of complex life (HZCL) on which Earth-like N2-O2-dominated atmospheres with minor amounts of CO2 can exist, and derived a formulation for estimating the maximum number of EHs in the galaxy given realistic pro…
Where do they come from?. Identification of escaped globular cluster stars
Tian, Hao; Huang, Yang; Wang, Long +5 more
Globular clusters (GCs), as old as our Galaxy, constantly lose their members to the field as they cross through the Milky Way (MW). These escaped GC stars (or escapees) are thought to contribute significantly to the MW halo. If a star left the host GC a long time ago, chemical finger prints (e.g., N enrichment) may reveal its origin. In this work …
Asteroid Orbit Determination Using Gaia FPR: Statistical Analysis
Naidu, Shantanu P.; Farnocchia, Davide; Park, Ryan S. +1 more
The Gaia mission has provided astrometric observations of unprecedented accuracy for more than 156,000 asteroids. The reported astrometric uncertainties are of the order of milliarcseconds, about 2 orders of magnitude smaller than that of traditional ground-based observations. The accuracy of Gaia data requires a high-fidelity orbit determination …
Probing Na in giant exoplanets with ESPRESSO and 3D NLTE stellar spectra
Pallé, E.; Stangret, M.; Lind, K. +3 more
Context. Neutral sodium was the first atom that was detected in an exoplanetary atmosphere using the transmission spectroscopy technique. To date, it remains the most successfully detected species due to its strong doublet in the optical at 5890 Å and 5896 Å. However, the center-to-limb variation (CLV) of these lines in the host star can bias the …
Nitrogen Abundance Distribution in the Inner Milky Way
Gong, Yan; Menten, Karl M.; Anderson, L. D. +9 more
We combine a new Galactic plane survey of hydrogen radio recombination lines (RRLs) with far-infrared surveys of ionized nitrogen, N+, to determine nitrogen abundance across Galactic radius. RRLs were observed with the NASA Deep Space Network Station 43 70 m antenna and the Green Bank Telescope in 108 lines of sight spanning ‑135°< l…
Constraints on the fuzzy dark matter mass window from high-redshift observables
Kovetz, Ely D.; Lazare, Hovav; Flitter, Jordan
We use a combination of high-redshift observables to extract the strongest constraints to date on the fraction of axion fuzzy dark matter (FDM) in the mass window