Search Publications
X-Shooting ULLYSES: Massive stars at low metallicity: VI. Atmosphere and mass-loss properties of O-type giants in the Small Magellanic Cloud
van Loon, J. Th.; Kaper, L.; Crowther, P. A. +21 more
Context. Mass loss through a stellar wind is an important physical process that steers the evolution of massive stars and controls the properties of their end-of-life products, such as the supernova type and the mass of compact remnants. To probe its role in stellar evolution over cosmic time, mass loss needs to be studied as function of metallici…
Spectroscopic Observations of Coronal Rain Formation and Evolution Following an X2 Solar Flare
Warren, Harry P.; Ugarte-Urra, Ignacio; Brooks, David H. +2 more
A significant impediment to solving the coronal heating problem is that we currently only observe active region loops in their cooling phase. Previous studies showed that the evolution of cooling loop densities and apex temperatures is insensitive to the magnitude, duration, and location of energy deposition. Still, potential clues to how energy i…
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): The SPHERE view of the Orion star-forming region
Ginski, C.; Garufi, A.; Dominik, C. +17 more
Context. Resolved observations at near-infrared (near-IR) and millimeter wavelengths have revealed a diverse population of planet-forming disks. In particular, near-IR scattered light observations usually target close-by, low-mass star-forming regions. However, disk evolution in high-mass star-forming regions is likely affected by the different en…
A First Look with JWST Aperture Masking Interferometry: Resolving Circumstellar Dust around the Wolf–Rayet Binary WR 137 beyond the Rayleigh Limit
Corcoran, Michael F.; Morris, Mark R.; Russell, Christopher M. P. +20 more
We present infrared aperture-masking interferometry (AMI) observations of newly formed dust from the colliding winds of the massive binary Wolf–Rayet system WR 137 with JWST using the Near Infrared Imager and Slitless Spectrograph (NIRISS). NIRISS AMI observations of WR 137 and a point-spread function calibrator star, HD 228337, were taken using t…
Empirical mass-loss rates and clumping properties of O-type stars in the Large Magellanic Cloud
Puls, J.; de Koter, A.; Decin, L. +6 more
Context. The nature of mass-loss in massive stars is one of the most important and difficult to constrain processes in the evolution of massive stars. The largest observational uncertainties are related to the influence of metallicity and wind structure with optically thick clumps. Aims. We aim to constrain the wind parameters of sample of 18 O-ty…
The AGN fraction in high-redshift protocluster candidates selected by Planck and Herschel
Frye, Brenda; Demarco, Ricardo; Rettura, Alessandro +4 more
A complete understanding of the mass assembly history of structures in the Universe requires the study of the growth of galaxies and their supermassive black holes (SMBHs) as a function of their local environment over cosmic time. In this context, it is important to quantify the effects that the early stages of galaxy cluster development have on t…
Observational signatures of the dust size evolution in isolated galaxy simulations
Matsumoto, Kosei; De Looze, Ilse; Baes, Maarten +9 more
Aims. We aim to provide observational signatures of the dust size evolution in the interstellar medium. In particular, we explore indicators of the polycyclic aromatic hydrocarbon (PAH) mass fraction (qPAH), defined as the mass fraction of PAHs relative to the total dust grains. In addition, we validate our dust evolution model by compa…
Goodbye to Chi by Eye: A Bayesian Analysis of Photometric Binaries in Six Open Clusters
von Hippel, Ted; Motherway, Erin; Geller, Aaron M. +2 more
We present a robust methodology for identifying photometric binaries in star clusters. Using Gaia DR3, Pan-STARRS, and Two Micron All Sky Survey data, we self-consistently define the cluster parameters and binary demographics for the open clusters (OCs) NGC 2168 (M35), NGC 7789, NGC 6819, NGC 2682 (M67), NGC 188, and NGC 6791. These clusters span …
Long term variability of Cygnus X-1. VIII. A spectral-timing look at low energies with NICER
Ingram, Adam; Steiner, James F.; Grinberg, Victoria +19 more
The Neutron Star Interior Composition Explorer (NICER) monitoring campaign of Cyg X-1 allows us to study its spectral-timing behavior at energies < 1 keV across all states. The hard state power spectrum can be decomposed into two main broad Lorentzians with a transition at around 1 Hz. The lower-frequency Lorentzian is the dominant component at…
A3COSMOS: Dust mass function and dust mass density at 0.5 < z < 6
Magnelli, B.; Pozzi, F.; Feltre, A. +7 more
Context. Although dust in galaxies represents only a few percent of the total baryonic mass, it plays a crucial role in the physical processes occurring in galaxies. Studying the dust content of galaxies, particularly at high z, is therefore crucial for understanding the link between dust production, obscured star formation, and the build-up of ga…