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A Census of the Stellar Populations in the Sco-Cen Complex
Luhman, K. L.
I have used high-precision photometry and astrometry from the early installment of the third data release of Gaia (EDR3) to perform a survey for members of the stellar populations within the Sco-Cen complex, which consist of Upper Sco, UCL/LCC, the V1062 Sco group, Ophiuchus, and Lupus. Among Gaia sources with σ π < 1 mas, I have i…
ExoMiner: A Highly Accurate and Explainable Deep Learning Classifier That Validates 301 New Exoplanets
Jenkins, Jon M.; Caldwell, Douglas A.; Twicken, Joseph D. +10 more
The Kepler and Transiting Exoplanet Survey Satellite (TESS) missions have generated over 100,000 potential transit signals that must be processed in order to create a catalog of planet candidates. During the past few years, there has been a growing interest in using machine learning to analyze these data in search of new exoplanets. Different from…
Constraining the original composition of the gas forming first-generation stars in globular clusters
Milone, A. P.; Cordoni, G.; Marino, A. F. +13 more
Disentangling distinct stellar populations along the red-giant branches (RGBs) of globular clusters (GCs) is possible by using the pseudo-two-colour diagram dubbed chromosome map (ChM). One of the most intriguing findings is that the so-called first-generation (1G) stars, characterized by the same chemical composition of their natal cloud, exhibit…
Milky Way Star Clusters and Gaia: A Review of the Ongoing Revolution
Cantat-Gaudin, Tristan
The unprecedented quality of the astrometric measurements obtained with the ESA Gaia spacecraft have initiated a revolution in Milky Way astronomy. Studies of star clusters in particular have been transformed by the precise proper motions and parallaxes measured by Gaia over the entire sky as well as Gaia's deep all-sky photometry. This paper pres…
X-ray detection of a nova in the fireball phase
Wilms, Jörn; Haberl, Frank; Rauch, Thomas +17 more
Novae are caused by runaway thermonuclear burning in the hydrogen-rich envelopes of accreting white dwarfs, which leads to a rapid expansion of the envelope and the ejection of most of its mass1,2. Theory has predicted the existence of a `fireball' phase following directly on from the runaway fusion, which should be observable as a shor…
Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
Alonso, R.; Deleuil, M.; Erikson, A. +82 more
Context. The light curves of tidally locked hot Jupiters transiting fast-rotating, early-type stars are a rich source of information about both the planet and star, with full-phase coverage enabling a detailed atmospheric characterisation of the planet. Although it is possible to determine the true spin-orbit angle Ψ - a notoriously difficult para…
Characterizing Extreme Emission Line Galaxies. II. A Self-consistent Model of Their Ionizing Spectrum
Skillman, Evan D.; Chisholm, John; Erb, Dawn K. +3 more
Observations of high-redshift galaxies (z > 5) have shown that these galaxies have extreme emission lines with equivalent widths much larger than their local star-forming counterparts. Extreme emission line galaxies (EELGs) in the nearby universe are likely analogs to galaxies during the Epoch of Reionization and provide nearby laboratories to …
The GALAH survey: chemical clocks
Lewis, Geraint F.; Casey, Andrew R.; Buder, Sven +29 more
We present the first large-scale study that demonstrates how ages can be determined for large samples of stars through Galactic chemical evolution. Previous studies found that the elemental abundances of a star correlate directly with its age and metallicity. Using this knowledge, we derive ages for 214 577 stars in GALAH DR3 using only overall me…
A3COSMOS: A census on the molecular gas mass and extent of main-sequence galaxies across cosmic time
Schinnerer, Eva; Liu, Daizhong; Kokorev, Vasily +6 more
Aims: We aim to constrain for the first time the mean mass and extent of the molecular gas of a mass-complete sample of normal > 1010 M⊙ star-forming galaxies at 0.4 < z < 3.6.
Methods: We apply an innovative uv-based stacking analysis to a large set of archival Atacama Large Millimeter/submillimeter Array …
Cosmic evolution of low-excitation radio galaxies in the LOFAR two-metre sky survey deep fields
Calistro Rivera, Gabriela; Małek, Katarzyna; Wang, Lingyu +16 more
Feedback from low-excitation radio galaxies (LERGs) plays a key role in the lifecycle of massive galaxies in the local Universe; their evolution, and the impact of these active galactic nuclei on early galaxy evolution, however, remain poorly understood. We use a sample of 10 481 LERGs from the first data release of the LOFAR two-metre Sky Survey …