Search Publications
Ionized gas kinematics and chemical abundances of low-mass star-forming galaxies at z ∼ 3
Pentericci, L.; Boutsia, K.; Amorín, R. +6 more
Context. Feedback from massive stars plays a crucial role in regulating the growth of young star-forming galaxies (SFGs) and in shaping their interstellar medium (ISM). This feedback contributes to the removal and mixing of metals via galactic outflows and to the clearance of neutral gas, which facilitates the escape of ionizing photons.
Aims…
Picoflare jets power the solar wind emerging from a coronal hole on the Sun
Barczynski, K.; Peter, H.; Chitta, L. P. +17 more
Coronal holes are areas on the Sun with open magnetic field lines. They are a source region of the solar wind, but how the wind emerges from coronal holes is not known. We observed a coronal hole using the Extreme Ultraviolet Imager on the Solar Orbiter spacecraft. We identified jets on scales of a few hundred kilometers, which last 20 to 100 seco…
Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars
Beers, Timothy C.; Placco, Vinicius M.; Mardini, Mohammad +7 more
We construct a sample of 644 carbon-enhanced metal-poor (CEMP) stars with abundance analyses based on moderate- to high-resolution spectroscopic studies. Dynamical parameters for these stars are estimated based on radial velocities, Bayesian parallax-based distance estimates, and proper motions from Gaia EDR3 and DR3, supplemented by additional av…
Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
Santini, Paola; Castellano, Marco; Fontana, Adriano +18 more
We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 µm wavelengths and the panchromatic 0.9-4.5 µm coverage of the spectral energy distribution. The unresolved point sou…
Stellar Escape from Globular Clusters. I. Escape Mechanisms and Properties at Ejection
Chatterjee, Sourav; Kremer, Kyle; Weatherford, Newlin C. +3 more
The theory of stellar escape from globular clusters (GCs) dates back nearly a century, especially the gradual evaporation of GCs via two-body relaxation coupled with external tides. More violent ejection can also occur via strong gravitational scattering, supernovae, gravitational wave-driven mergers, tidal disruption events, and physical collisio…
Transition disks: the observational revolution from SEDs to imaging
van der Marel, Nienke
Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interf…
Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets
Pascucci, Ilaria; López-Morales, Mercedes; Apai, Dániel +2 more
Molecular oxygen is a strong indicator of life on Earth and may indicate biological processes on exoplanets too. Recent studies proposed that Earth-like O2 levels might be detectable on nearby exoplanets using high-resolution spectrographs on future extremely large telescopes (ELTs). However, these studies did not consider constraints l…
JWST's PEARLS: Transients in the MACS J0416.1-2403 Field
Grogin, Norman A.; Pirzkal, Nor; Conselice, Christopher J. +27 more
With its unprecedented sensitivity and spatial resolution, the James Webb Space Telescope (JWST) has opened a new window for time-domain discoveries in the infrared. Here we report observations in the only field that has received four epochs (spanning 126 days) of JWST NIRCam observations in Cycle 1. This field is toward MACS J0416.1-2403, which i…
Potential signature of a quadrupolar hubble expansion in Pantheon+supernovae
Dhawan, Suhail; Cowell, Jessica A.; Macpherson, Hayley J.
The assumption of isotropy - that the Universe looks the same in all directions on large scales - is fundamental to the standard cosmological model. It is therefore critical to empirically test in which regimes this assumption holds. Anisotropies in the cosmic expansion are expected due to non-linear structures in the late Universe. However, the e…
On the origin of the Galactic thin and thick discs, their abundance gradients and the diagnostic potential of their abundance ratios
Cristallo, Sergio; de Laverny, Patrick; Recio-Blanco, Alejandra +8 more
Using a semi-analytical model of the evolution of the Milky Way, we show how secular evolution can create distinct overdensities in the phase space of various properties (e.g. age versus metallicity or abundance ratios versus age) corresponding to the thin and thick discs. In particular, we show how key properties of the Solar vicinity can be obta…