Search Publications
Wind properties of Milky Way and SMC massive stars: empirical Z dependence from CMFGEN models
Bouret, J. -C.; Vink, J. S.; Bernini-Peron, M. +2 more
Detailed knowledge about stellar winds and evolution at different metallicities is crucial for understanding stellar populations and feedback in the Local Group of galaxies and beyond. Despite efforts in the literature, we still lack a comprehensive, empirical view of the dependence of wind properties on metallicity (Z). Here, we investigate the w…
Eclipse of the V773 Tau B circumbinary disc
Ginski, C.; Mugrauer, M.; Vogt, N. +9 more
Context. Young multiple stellar systems can host both circumstellar and circumbinary discs composed of gas and dust, and the orientations of circumbinary discs can be sculpted by the orientation and eccentricity of the central binaries. Studying multiple binary systems and their associated discs enables our understanding of the size and distributi…
The Candidate Progenitor Companion Star of the Type Ib/c SN 2013ge
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Williams, Benjamin F. +17 more
This Letter presents the detection of a source at the position of the Type Ib/c supernova (SN) 2013ge more than four years after the radioactive component is expected to have faded. This source could mark the first post-SN direct detection of a surviving companion to a stripped-envelope Type Ib/c explosion. We test this hypothesis and find the sha…
Constraints to neutron-star kicks in high-mass X-ray binaries with Gaia EDR3
García, Federico; Chaty, Sylvain; Fortin, Francis +2 more
Context. All neutron star progenitors in neutron-star high-mass X-ray binaries (NS HMXBs) undergo a supernova event that may lead to a significant natal kick impacting the motion of the whole binary system. The space observatory Gaia performs a deep optical survey with exquisite astrometric accuracy, for both position and proper motions, that can …
A gravitational and dynamical framework of star formation: the Orion nebula
Stassun, Keivan G.; Kounkel, Marina; Hartmann, Lee +1 more
The Orion Nebula Cluster (ONC) is the most massive region of active star formation within a kpc of the Sun. Using Gaia DR3 parallaxes and proper motions, we examine the bulk motions of stars radially and tangentially relative to the cluster centre. We find an age gradient with distance to the stars in the ONC, from 385 pc for the oldest stars, to …
Magellan/IMACS Spectroscopy of Grus I: A Low Metallicity Ultra-faint Dwarf Galaxy
Li, Ting S.; Frebel, Anna; Simon, Joshua D. +3 more
We present a chemodynamical study of the Grus I ultra-faint dwarf galaxy (UFD) from medium-resolution (R ~ 11,000) Magellan/IMACS spectra of its individual member stars. We identify eight confirmed members of Grus I, based on their low metallicities and coherent radial velocities, and four candidate members for which only velocities are derived. I…
Sensor noise in LISA Pathfinder: An extensive in-flight review of the angular and longitudinal interferometric measurement system
Mendes, L.; Russano, G.; Sanjuan, J. +84 more
In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA's LISA Pathfinder mission, and have shown the residual sensor noise to be on the level of 32.0-1.7+2.4 fm /√{Hz } . This review provides a deeper and more complete overview of the full system and its interferomet…
Group Sunspot Numbers: A New Reconstruction of Sunspot Activity Variations from Historical Sunspot Records Using Algorithms from Machine Learning
Velasco Herrera, Víctor Manuel; Soon, Willie; Hoyt, Douglas V. +1 more
Historical sunspot records and the construction of a comprehensive database are among the most sought after research activities in solar physics. Here, we revisit the issues and remaining questions on the reconstruction of the so-called group sunspot numbers (GSN) that was pioneered by D. Hoyt and colleagues. We use the modern tools of artificial …
The signature of large-scale turbulence driving on the structure of the interstellar medium
Robitaille, Jean-François; Glover, Simon C. O.; Klessen, Ralf S. +9 more
The mechanisms that maintain turbulence in the interstellar medium (ISM) are still not identified. This work investigates how we can distinguish between two fundamental driving mechanisms: the accumulated effect of stellar feedback versus the energy injection from galactic scales. We perform a series of numerical simulations describing a stratifie…
Global Vertical Distribution of Water Vapor on Mars: Results From 3.5 Years of ExoMars-TGO/NOMAD Science Operations
Aoki, S.; Vandaele, A. C.; Daerden, F. +20 more
We present water vapor vertical distributions on Mars retrieved from 3.5 years of solar occultation measurements by Nadir and Occultation for Mars Discovery onboard the ExoMars Trace Gas Orbiter, which reveal a strong contrast between aphelion and perihelion water climates. In equinox periods, most of water vapor is confined into the low-middle la…