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The use of double-mode RR Lyrae stars as robust distance and metallicity indicators
Wang, Shu; Deng, Licai; Chen, Xiaodian +1 more
RR Lyrae stars are one of the primary distance indicators for old stellar populations such as globular clusters, dwarf galaxies and galaxies. Typically, fundamental-mode RR Lyr stars are used for distance measurements, and their accuracy is strongly limited by the dependence of absolute magnitudes on metallicity, in both the optical and infrared b…
MUSE-ALMA Haloes XI: gas flows in the circumgalactic medium
Kacprzak, Glenn G.; Nelson, Dylan; Kulkarni, Varsha P. +12 more
The flow of gas into and out of galaxies leaves traces in the circumgalactic medium which can then be studied using absorption lines towards background quasars. We analyse 27 ${{\log [N({\textrm {H}}\, {\small {I}})/\rm {cm}^{-2}]}} > 18.0$ H I absorbers at z = 0.2 to 1.4 from the MUSE-ALMA Haloes survey with at least one galaxy counterpart wit…
Measuring Galactic dark matter through unsupervised machine learning
Lim, Sung Hak; Buckley, Matthew R.; Shih, David +1 more
Measuring the density profile of dark matter in the Solar neighbourhood has important implications for both dark matter theory and experiment. In this work, we apply autoregressive flows to stars from a realistic simulation of a Milky Way-type galaxy to learn - in an unsupervised way - the stellar phase space density and its derivatives. With thes…
A Massive Hot Jupiter Orbiting a Metal-rich Early M Star Discovered in the TESS Full-frame Images
Latham, David W.; Quinn, Samuel N.; Littlefield, Colin +41 more
Observations and statistical studies have shown that giant planets are rare around M dwarfs compared with Sun-like stars. The formation mechanism of these extreme systems has remained under debate for decades. With the help of the TESS mission and ground-based follow-up observations, we report the discovery of TOI-4201b, the most massive and dense…
The ALMA Frontier Fields Survey. VI. Lensing-corrected 1.1 mm number counts in Abell 2744, MACSJ0416.1-2403, MACSJ1149.5+2223, Abell 370, and Abell S1063
Kneissl, R.; Demarco, R.; Bauer, F. E. +8 more
Context. Probing the faint end of the number counts at millimeter wavelengths is important in order to identify the origin of the extragalactic background light in this regime. Aided by strong gravitational lensing, ALMA observations toward massive galaxy clusters have opened a window to probe this origin, allowing us to resolve sub-milliJansky du…
CARMA-NRO Orion Survey: Unbiased Survey of Dense Cores and Core Mass Functions in Orion A
Sanhueza, Patricio; Nakamura, Fumitaka; Shimajiri, Yoshito +16 more
The mass distribution of dense cores is a potential key to understanding the process of star formation. Applying dendrogram analysis to the CARMA-NRO Orion C18O (J = 1-0) data, we identify 2342 dense cores, about 22% of which have virial ratios smaller than 2 and can be classified as gravitationally bound cores. The derived core mass fu…
The Chemical Enrichment of the Milky Way Disk Evaluated Using Conditional Abundances
Ness, Melissa K.; Ratcliffe, Bridget L.
Chemical abundances of Milky Way disk stars are empirical tracers of its enrichment history. However, they capture joint-information that is valuable to disentangle. In this work, we quantify how individual abundances evolve across the present-day Galactic radius, at fixed supernovae contribution ([Fe/H], [Mg/Fe]). We use 18,135 Apache Point Obser…
The Metallicity Variations Along the Chromosome Maps: The Globular Cluster 47 Tucanae
Milone, A. P.; Cordoni, G.; Marino, A. F. +11 more
The "chromosome maps" (ChMs) of globular clusters (GCs) have revealed that these ancient structures are inhomogeneous in metallicity in various ways and in different natures. Type II GCs generally display larger variations, sometimes coupled with slow neutron-capture (s) element enrichments on the ChMs redder sequences, which have been interpreted…
Stellar classification with convolutional neural networks and photometric images: a new catalogue of 50 million SDSS stars without spectra
Luo, A. -Li; Kong, Xiao; Shi, Jing-Hang +3 more
Stellar classification is a central topic in astronomical research that relies mostly on the use of spectra. However, with the development of large sky surveys, spectra are becoming increasingly scarce compared to photometric images. Numerous observed stars lack spectral types. In Sloan Digital Sky Survey (SDSS), there are more than hundreds of mi…
Exploring the variability of the venusian thermosphere with the IPSL Venus GCM
Lefèvre, Franck; Lebonnois, Sébastien; Millour, Ehouarn +4 more
Recent simulations of the Institut Pierre-Simon Laplace (IPSL) Venus Global Climate Model (VGCM) developed at the Laboratoire de Météorologie Dynamique (LMD) were performed with a model top raised from ∼10-5 (∼150 km) to ∼10-8 Pa (180-250 km; upper boundary). The parameterizations of non-LTE CO2 near infrared heati…