Search Publications
Probing the Physics of the Solar Atmosphere with the Multi-slit Solar Explorer (MUSE). II. Flares and Eruptions
Reeves, Katharine K.; Polito, Vanessa; Golub, Leon +25 more
Current state-of-the-art spectrographs cannot resolve the fundamental spatial (subarcseconds) and temporal (less than a few tens of seconds) scales of the coronal dynamics of solar flares and eruptive phenomena. The highest-resolution coronal data to date are based on imaging, which is blind to many of the processes that drive coronal energetics a…
Definitive upper bound on the negligible contribution of quasars to cosmic reionization
Ho, Luis C.; Fan, Xiaohui; Jiang, Linhua +7 more
Cosmic (hydrogen) reionization marks one of the major phase transitions of the universe at redshift z ≥ 6. During this epoch, hydrogen atoms in the intergalactic medium were ionized by Lyman continuum (LyC) photons. However, it remains challenging to identify the major sources of the LyC photons responsible for reionization. In particular, individ…
The Galactic metallicity gradient shown by open clusters in the light of radial migration
Netopil, Martin; Oralhan, İnci Akkaya; Çakmak, Hikmet +2 more
During the last years and decades, several individual studies and large-scale spectroscopic surveys significantly improved our knowledge of the Galactic metallicity distribution based on open clusters. The availability of Gaia data provided a further step forward in our knowledge. However, still some open issues remain, for example, the influence …
Substructure in the stellar halo near the Sun. II. Characterisation of independent structures
Koppelman, H. H.; Helmi, A.; Ruiz-Lara, T. +3 more
Context. In an accompanying paper, we present a data-driven method for clustering in `integrals of motion' space and apply it to a large sample of nearby halo stars with 6D phase-space information. The algorithm identified a large number of clusters, many of which could tentatively be merged into larger groups.
Aims: The goal here is to estab…
The VLA/ALMA Nascent Disk And Multiplicity (VANDAM) Survey of Orion Protostars. V. A Characterization of Protostellar Multiplicity
Kratter, Kaitlin M.; Li, Zhi-Yun; van Dishoeck, Ewine F. +16 more
We characterize protostellar multiplicity in 20 Current address: Niels Bohr Institute, University of Copenhagen, Øster Voldgade 5â7, DK-1350, Copenhagen K, Denmark. the Orion molecular clouds using Atacama Large Millimeter/submillimeter Array 0.87 mm and Very Large Array 9 mm continuum surveys toward 328 protostars. These observations…
Two temperate super-Earths transiting a nearby late-type M dwarf
Tamura, M.; Kudo, T.; Bouchy, F. +82 more
Context. In the age of JWST, temperate terrestrial exoplanets transiting nearby late-type M dwarfs provide unique opportunities for characterising their atmospheres, as well as searching for biosignature gases. In this context, the benchmark TRAPPIST-1 planetary system has garnered the interest of a broad scientific community.
Aims: We report…
Gradients of chemical abundances in the Milky Way from H II regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
Méndez-Delgado, J. E.; Arellano-Córdova, K. Z.; García-Rojas, J. +4 more
We present a reassessment of the radial abundance gradients of He, C, N, O, Ne, S, Cl, and Ar in the Milky Way using the deep optical spectra of 42 H II regions presented in Arellano-Córdova et al. (2020, 2021) and Méndez-Delgado et al. (2020) exploring the impact of: (1) new distance determinations based on Gaia EDR3 parallaxes and (2) the use of…
The Atari Disk, a Metal-poor Stellar Population in the Disk System of the Milky Way
Frebel, Anna; Mardini, Mohammad K.; Chiti, Anirudh +3 more
We have developed a chemodynamical approach to assign 36,010 metal-poor SkyMapper stars to various Galactic stellar populations. Using two independent techniques (velocity and action space behavior), Gaia EDR3 astrometry, and photometric metallicities, we selected stars with the characteristics of the "metal-weak" thick-disk population by minimizi…
New Roads to the Small-scale Universe: Measurements of the Clustering of Matter with the High-redshift UV Galaxy Luminosity Function
Muñoz, Julian B.; Sabti, Nashwan; Blas, Diego
The epochs of cosmic dawn and reionization present promising avenues for understanding the role of dark matter (DM) in our cosmos. The first galaxies that populated the universe during these eras resided in DM halos that were much less massive than their counterparts today. Consequently, observations of such galaxies can provide us with a handle o…
First JWST observations of a gravitational lens. Mass model from new multiple images with near-infrared observations of SMACS J0723.3−7327
Brammer, G.; Vanzella, E.; Mercurio, A. +4 more
We present our lens mass model of SMACS J0723.3−7327, the first strong gravitational lens observed by the James Webb Space Telescope (JWST). We use data from the Hubble Space Telescope and the Multi Unit Spectroscopic Explorer (MUSE) to build our `pre-JWST' lens model and then refine it with newly available JWST near-infrared imaging in our JWST m…