Search Publications
A kinematic study of central compact objects and their host supernova remnants
Becker, Werner; Mayer, Martin G. F.
Context. Central compact objects (CCOs) are a peculiar class of neutron stars, primarily encountered close to the center of young supernova remnants (SNRs) and characterized by thermal X-ray emission. Measurements of their proper motion and the expansion of the parent SNR are powerful tools for constraining explosion kinematics and the age of the …
Hubble spectroscopy of LB-1: Comparison with B+black-hole and Be+stripped-star models
Smartt, S. J.; Dufton, P. L.; Lennon, D. J. +10 more
Context. LB-1 (alias ALS 8775) has been proposed as either an X-ray dim B-type star plus black hole (B+BH) binary or a Be star plus an inflated stripped star (Be+Bstr) binary. The latter hypothesis contingent upon the detection and characterization of the hidden broad-lined star in a composite optical spectrum.
Aims: Our study is aimed at tes…
A feather on the hat: tracing the giant stellar stream around the Sombrero galaxy
Carballo-Bello, Julio A.; Erkal, Denis; Laine, Seppo +7 more
Recent evidence of extremely metal-rich stars found in the Sombrero galaxy (M104) halo suggests that this galaxy has undergone a recent major merger with a relatively massive galaxy. In this paper, we present wide-field deep images of the M104 outskirts obtained with a 18-cm amateur telescope with the purpose of detecting any coherent tidal featur…
An AMUSING look at the host of the periodic nuclear transient ASASSN-14ko reveals a second AGN
Kochanek, C. S.; Galbany, L.; Holoien, Thomas W. -S. +10 more
We present Multi-Unit Spectroscopic Explorer (MUSE) integral-field spectroscopy of ESO 253-G003, which hosts a known active galactic nucleus (AGN) and the periodic nuclear transient ASASSN-14ko, observed as part of the All-weather MUse Supernova Integral-field of Nearby Galaxies survey. The MUSE observations reveal that the inner region hosts two …
Inner and Outer Orbits in 13 Resolved Hierarchical Stellar Systems
Tokovinin, A.
Orbits of inner and outer subsystems in 13 triple or higher-order stellar systems are computed or updated using position measurements and, in three cases, radial velocities. The goal is to determine mutual orbital inclinations, period ratios, and masses to complement the statistics of hierarchical systems. The effect of the subsystems on the motio…
Fragmentation and kinematics in high-mass star formation. CORE-extension targeting two very young high-mass star-forming regions
Henning, Th.; Beuther, H.; Klaassen, P. +24 more
Context. The formation of high-mass star-forming regions from their parental gas cloud and the subsequent fragmentation processes lie at the heart of star formation research.
Aims: We aim to study the dynamical and fragmentation properties at very early evolutionary stages of high-mass star formation.
Methods: Employing the NOrthern Exte…
ExoMars TGO/NOMAD-UVIS Vertical Profiles of Ozone: 2. The High-Altitude Layers of Atmospheric Ozone
Thomas, Ian; Daerden, Frank; Ristic, Bojan +12 more
Solar occultations performed by the Nadir and Occultation for MArs Discovery (NOMAD) ultraviolet and visible spectrometer (UVIS) onboard the ExoMars Trace Gas Orbiter (TGO) have provided a comprehensive mapping of atmospheric ozone density. The observations here extend over a full Mars year (MY) between April 21, 2018 at the beginning of the TGO s…
EPIC 228782059: Asteroseismology of What Could Be the Coolest Pulsating Helium-atmosphere White Dwarf (DBV) Known
Hermes, J. J.; Fu, J. -N.; Vanderbosch, Zachary P. +5 more
We present analysis of a new pulsating helium-atmosphere (DB) white dwarf, EPIC 228782059, discovered from 55.1 days of K2 photometry. The long-duration, high-quality light curves reveal 11 independent dipole and quadruple modes, from which we derive a rotational period of 34.1 ± 0.4 hr for the star. An optimal model is obtained from a series of g…
X-ray variability of the HMXB Cen X-3: evidence for inhomogeneous accretion flows
Torrejón, J. M.; Postnov, K.; Oskinova, L. +3 more
Cen X-3 is a compact high-mass X-ray binary likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of two pointed XMM-Newton observations. The first one took place during a normal state of the source, when it has a luminosity LX ∼ 1036 erg s-1. This observation covered…
Solar energetic particle heavy ion properties in the widespread event of 2020 November 29
Kulkarni, S. R.; Mitchell, D. G.; McComas, D. J. +57 more
Context. Following a multi-year minimum of solar activity, a solar energetic particle event on 2020 Nov. 29 was observed by multiple spacecraft covering a wide range of solar longitudes including ACE, the Solar Terrestrial Relations Observatory-A, and the recently launched Parker Solar Probe and Solar Orbiter.
Aims: Multi-point observations o…