Search Publications
Intermediate- and high-velocity clouds in the Milky Way - I. Covering factors and vertical heights
Lehner, Nicolas; Howk, J. Christopher; Marasco, Antonino +1 more
Intermediate- and high-velocity clouds (IVCs, HVCs) are a potential source of fuel for star formation in the Milky Way (MW), but their origins and fates depend sensitively on their distances. We search for IVCs and HVCs in HST high-resolution ultraviolet spectra of 55 halo stars at vertical heights $|z|\gtrsim \,1$ kpc. We show that IVCs (40 ≤ |$v…
Retrieving the C and O Abundances of HR 7672 AB: A Solar-type Primary Star with a Benchmark Brown Dwarf
Fitzgerald, Michael P.; Skemer, Andrew; Wallack, Nicole L. +30 more
A benchmark brown dwarf (BD) is a BD whose properties (e.g., mass and chemical composition) are precisely and independently measured. Benchmark BDs are valuable in testing theoretical evolutionary tracks, spectral synthesis, and atmospheric retrievals for substellar objects. Here, we report results of atmospheric retrieval on a synthetic spectrum …
Asymmetrical tidal tails of open star clusters: stars crossing their cluster's práh† challenge Newtonian gravitation
Famaey, Benoit; Kroupa, Pavel; Boffin, Henri M. J. +14 more
After their birth a significant fraction of all stars pass through the tidal threshold (práh) of their cluster of origin into the classical tidal tails. The asymmetry between the number of stars in the leading and trailing tails tests gravitational theory. All five open clusters with tail data (Hyades, Praesepe, Coma Berenices, COIN-Gaia 13, NGC 7…
METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble Program. III. Interstellar Depletions, Dust-to-Metal, and Dust-to-Gas Ratios versus Metallicity
Jenkins, Edward B.; Yanchulova Merica-Jones, Petia; Gordon, Karl D. +9 more
The metallicity and gas density dependence of interstellar depletions, the dust-to-gas (D/G), and dust-to-metal (D/M) ratios have important implications for how accurately we can trace the chemical enrichment of the universe, either by using FIR dust emission as a tracer of the ISM or by using spectroscopy of damped Lyα systems to measure chemical…
The mass and size of Herbig disks as seen by ALMA
van Dishoeck, E. F.; Hogerheijde, M. R.; Stapper, L. M. +1 more
Context. Many population studies have been performed over the past decade with the Atacama Large millimeter/submillimeter Array (ALMA) to understand the bulk properties of protoplanetary disks around young stars. The studied populations have mostly consisted of late spectral type (i.e., G, K & M) stars, with relatively few more massive Herbig …
A Possible Alignment Between the Orbits of Planetary Systems and their Visual Binary Companions
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +111 more
Astronomers do not have a complete picture of the effects of wide-binary companions (semimajor axes greater than 100 au) on the formation and evolution of exoplanets. We investigate these effects using new data from Gaia Early Data Release 3 and the Transiting Exoplanet Survey Satellite mission to characterize wide-binary systems with transiting e…
Clearing the Hurdle: The Mass of Globular Cluster Systems as a Function of Host Galaxy Mass
Harris, William E.; Eadie, Gwendolyn M.; Springford, Aaron
Current observational evidence suggests that all large galaxies contain globular clusters (GCs), while the smallest galaxies do not. Over what galaxy mass range does the transition from GCs to no GCs occur? We investigate this question using galaxies in the Local Group (LG), nearby dwarf galaxies, and galaxies in the Virgo Cluster Survey. We consi…
TDCOSMO. IX. Systematic comparison between lens modelling software programs: Time-delay prediction for WGD 2038−4008
Frieman, J.; Treu, T.; Palmese, A. +15 more
The importance of alternative methods for measuring the Hubble constant, such as time-delay cosmography, is highlighted by the recent Hubble tension. It is paramount to thoroughly investigate and rule out systematic biases in all measurement methods before we can accept new physics as the source of this tension. In this study, we perform a check f…
The CGM2 Survey: Circumgalactic O VI from Dwarf to Massive Star-forming Galaxies
Tripp, Todd M.; Prochaska, J. Xavier; Tejos, Nicolas +9 more
We combine 126 new galaxy-O VI absorber pairs from the CGM2 survey with 123 pairs drawn from the literature to examine the simultaneous dependence of the column density of O VI absorbers (N O VI) on galaxy stellar mass, star-formation rate, and impact parameter. The combined sample consists of 249 galaxy-O VI absorber pairs …
The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. VI. Insights from Radiative Transfer Modeling
Sheehan, Patrick D.; Megeath, S. Thomas; Looney, Leslie W. +1 more
We present Markov Chain Monte Carlo radiative transfer modeling of a joint ALMA 345 GHz and spectral energy distribution data set for a sample of 97 protostellar disks from the VLA and ALMA Nascent Disk and Multiplicity Survey of Orion Protostars. From this modeling, we derive disk and envelope properties for each protostar, allowing us to examine…