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Localizing narrow Fe Kα emission within bright AGN
Brandt, William N.; Ricci, Claudio; Bauer, Franz E. +11 more
Context. The 6.4 keV Fe Kα emission line is a ubiquitous feature in X-ray spectra of active galactic nuclei (AGN), and its properties track the interaction between the variable primary X-ray continuum and the surrounding structure from which it arises.
Aims: We clarify the nature and origin of the narrow Fe Kα emission using X-ray spectral, t…
A NICER look at thermonuclear X-ray bursts from Aql X-1
Göğüş, Ersin; Chakrabarty, Deepto; Guillot, Sebastien +8 more
We present spectral and temporal properties of all the thermonuclear X-ray bursts observed from Aql X-1 by the Neutron Star Interior and Composition Explorer (NICER) between 2017 July and 2021 April. This is the first systematic investigation of a large sample of type I X-ray bursts from Aql X-1 with improved sensitivity at low energies. We detect…
Can Gaia find planets around white dwarfs?
Bonsor, Amy; Sanderson, Hannah; Mustill, Alexander
The Gaia spacecraft presents an unprecedented opportunity to reveal the population of long period (a > 1 au) exoplanets orbiting stars across the H-R diagram, including white dwarfs. White dwarf planetary systems have played an important role in the study of planetary compositions, from their unique ability to provide bulk elemental abundances …
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…