Search Publications
Stellar companions and Jupiter-like planets in young associations
Barbato, D.; D'Orazi, V.; Nascimbeni, V. +9 more
Context. The formation mechanisms of stellar, brown dwarf, and planetary companions, their dependencies on the environment and their interactions with each other are still not well established. Recently, combining high-contrast imaging and space astrometry we found that Jupiter-like (JL) planets are frequent in the β Pic moving group (BPMG) around…
Emergence hour-by-hour of r-process features in the kilonova AT2017gfo
Heintz, Kasper E.; Watson, Darach; Väisänen, Petri +4 more
The spectral features in the optical/near-infrared counterparts of neutron star mergers (kilonovae, KNe) evolve dramatically on hourly timescales. To examine the spectral evolution, we compiled a temporal series that was complete at all observed epochs from 0.5 to 9.4 days of the best optical/near-infrared (NIR) spectra of the gravitational-wave d…
Extended high-ionization [Mg IV] emission tracing widespread shocks in starbursts seen by JWST/NIRSpec
Arribas, Santiago; Perna, Michele; Colina, Luis +6 more
We report the detection of extended (> 0.5-1 kpc) high-ionization [Mg IV] 4.487 µm (80 eV) emission in four local luminous infrared galaxies observed with JWST/NIRSpec. Excluding the nucleus and outflow of the Type 1 active galactic nucleus (AGN) in the sample, we find that the [Mg IV] luminosity is well correlated with that of H recombin…
Gaia-Sausage-Enceladus star formation history as revealed by detailed elemental abundances: An archival study using SAGA data
Skúladóttir, Á.; Feltzing, S.; Ernandes, H. +1 more
Context. The Gaia-Sausage-Enceladus merger was a major event in the history of the Milky Way. Debris from this merger has been extensively studied with full kinematic data from the Gaia mission. Understanding the star formation history of the progenitor galaxy aids in our understanding of the evolution of the Milky Way and galaxy formation in gene…
Seven new triply eclipsing triple star systems
Mitnyan, T.; Pál, A.; Vanderburg, A. +19 more
Aims: We have identified nearly a hundred close triply eclipsing hierarchical triple star systems from data taken with the space telescope TESS. These systems are noteworthy in that we can potentially determine their dynamical and astrophysical parameters with a high precision. In the present paper, we report the comprehensive study of seven …
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…
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…
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…
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…
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…