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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
A 260 pc resolution ALMA map of HCN(1–0) in the galaxy NGC 4321
Henshaw, Jonathan D.; Rosolowsky, Erik; Chevance, Mélanie +24 more
The property of star formation rate (SFR) is tightly connected to the amount of dense gas in molecular clouds. However, it is not fully understood how the relationship between dense molecular gas and star formation varies within galaxies and in different morphological environments. Most previous studies have typically been limited to kiloparsec-sc…
Binary Yellow Supergiants in the Magellanic Clouds. I. Photometric Candidate Identification
Drout, Maria R.; O'Grady, Anna J. G.; Gaensler, B. M. +3 more
Recent works have constrained the binary fraction of evolved populations of massive stars in local galaxies such as red supergiants and Wolf–Rayet stars, but the binary fraction of yellow supergiants (YSGs) in the Hertzsprung gap remains unconstrained. Binary evolution theory predicts that the Hertzsprung gap is home to multiple populations of bin…
Modeling Cassini UVIS Interplanetary Hydrogen Lyα Observations from 1999 to 2017
Pryor, Wayne R.; Esposito, Larry W.; Gladstone, G. Randall +3 more
The Cassini Orbiter Ultraviolet Imaging Spectrograph (UVIS) obtained interplanetary hydrogen Lyα observations from 1999 to 2017, with mid-2004 to 2017 observations obtained from Saturn orbit. During its Saturn orbital phase, the spacecraft moved from mostly downwind and sidewind in the heliosphere to upwind. We analyze the full set of observations…
New technique to select recent fast-quenching galaxies at z 2 using the optical colours
Kajisawa, Masaru; Toba, Yoshiki; Kubo, Mariko +4 more
Many massive quiescent galaxies have been discovered at z > 2 thanks to multiwavelength deep and wide surveys; however, substantial deep near-infrared spectroscopic observations are needed to constrain their star formation histories statistically. Here, we present a new technique to select quiescent galaxies with a short quenching time-scale (≤…
Coevolution and Nuclear Structure in the Dwarf Galaxy POX 52 Studied by Multiwavelength Data from Radio to X-Ray
Kawamuro, Taiki; Ricci, Claudio; Noda, Hirofumi +4 more
The nearby dwarf galaxy POX 52 at z = 0.021 hosts an active galactic nucleus (AGN) with a black hole (BH) mass of M BH ~ 105-6 M ⊙ and an Eddington ratio of ~0.1-1. This object provides the rare opportunity to study both AGN and host-galaxy properties in a low-mass highly accreting system. To do so, we collected it…
Measuring the stellar and planetary parameters of the 51 Eridani system
Mann, Andrew W.; von Braun, Kaspar; Schaefer, Gail +3 more
In order to study exoplanets, a comprehensive characterisation of the fundamental properties of the host stars – such as angular diameter, temperature, luminosity, and age, is essential, as the formation and evolution of exoplanets are directly influenced by the host stars at various points in time. In this paper, we present interferometric observ…
How Well is the International Celestial Reference System Maintained in Official IAU Implementations?
Malkin, Zinovy
The International Celestial Reference Frame (ICRF) based on the VLBI-derived positions of 608 extragalactic radio sources was adopted by the International Astronomical Union (IAU) in 1998 as the first realization of the International Celestial Reference System (ICRS). Later, in 2009 and 2020, two extended ICRF versions, ICRF2 and ICRF3, respective…