Search Publications
A possible nearby microlensing stellar remnant hiding in Gaia DR3 astrometry
Rybicki, Krzysztof A.; Wyrzykowski, Łukasz; Kruszyńska, Katarzyna +3 more
Massive galactic lenses with large Einstein Radii should cause a measurable astrometric microlensing effect, that is, a light centroid shift due to the motion of the two images. Such a shift in the position of a background star due to microlensing was not included in the Gaia astrometric model, and therefore significant deviation should cause Gaia…
HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star
Bouchy, F.; Deleuil, M.; Moutou, C. +90 more
We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Autom…
UV and X-ray pulse amplitude variability in the transitional millisecond pulsar PSR J1023+0038
D'Avanzo, P.; Campana, S.; Stella, L. +7 more
The transitional millisecond pulsar PSR J1023+0038 is the first millisecond pulsar discovered to emit UV and optical pulses. Here we present the results of the UV and X-ray phase-resolved timing analysis of observations performed with the Hubble Space Telescope, XMM-Newton, and NuSTAR satellites between 2014 and 2021. Ultraviolet pulsations are de…
The MURALES survey. VI. Properties and origin of the extended line emission structures in radio galaxies
Marconi, A.; Capetti, A.; Gilli, R. +11 more
This is the sixth paper presenting the results of the MUse RAdio Loud Emission line Snapshot survey. We observed 37 radio sources from the 3C sample with z < 0.3 and a declination < 20° with the Multi Unit Spectroscopic Explorer optical integral field spectrograph at the Very Large Telescope. Here, we focus on the properties of the extended …
Evidence for a milliparsec-separation supermassive binary black hole with quasar microlensing
Courbin, F.; Sluse, D.; Lemon, C. +4 more
We report periodic oscillations in the 15-year-long optical light curve of the gravitationally lensed quasar Q J0158−4325 at zs = 1.29. The signal is enhanced during a high magnification microlensing event of the quasar that the fainter lensed image, B, underwent between 2003 and 2010. We measure a period of Po = 172.6 ± 0.9 …
Finding the birthplace of HMXBs in the Galaxy using Gaia EDR3: Kinematical age determination through orbit integration
García, Federico; Chaty, Sylvain; Fortin, Francis
Context. High-mass X-ray binaries (HMXBs) are produced after the first supernova event in a massive binary. These objects are intrinsically young and can suffer from a significant natal kick. As such, the progenitors of HMXBs are likely to have formed away from the current location of the X-ray emitting systems.
Aims: We aim to find the birth…
Scaling relations of z ∼ 0.25-1.5 galaxies in various environments from the morpho-kinematics analysis of the MAGIC sample
Bouché, N.; Brinchmann, J.; Krajnović, D. +10 more
Context. The evolution of galaxies is influenced by many physical processes, which may vary depending on their environment.
Aims: We combine Hubble Space Telescope (HST) and Multi-Unit Spectroscopic Explorer (MUSE) data of galaxies at 0.25 ≲ z ≲ 1.5 to probe the impact of environment on the size-mass relation, the main sequence (MS) relation,…
One Star to Tag Them All (OSTTA). I. Radial velocities and chemical abundances for 20 poorly studied open clusters
Baratella, M.; Jordi, C.; Casamiquela, L. +9 more
Context. Open clusters are ideal laboratories to investigate a variety of astrophysical topics, from the properties of the Galactic disc to stellar evolution models. For this purpose, we need to know their chemical composition in detail. Unfortunately, the number of systems with chemical abundances determined from high resolution spectroscopy rema…
The halo around HD 32297: µm-sized cometary dust
Bayo, A.; Olofsson, J.; Thébault, P. +1 more
Context. The optical properties of the second generation dust that we observe in debris disks remain quite elusive, whether it is the absorption efficiencies at millimeter wavelengths or the (un)polarized phase function at near-infrared wavelengths. Thankfully, the same particles are experiencing forces that are size dependent (e.g., radiation pre…
Determination of coronal mass ejection orientation and consequences for their propagation
Temmer, M.; Vršnak, B.; Veronig, A. +2 more
Context. The configuration of the interplanetary magnetic field and features of the related ambient solar wind in the ecliptic and meridional plane are different. Therefore, one can expect that the orientation of the flux-rope axis of a coronal mass ejection (CME) influences the propagation of the CME itself. However, the determination of the CME …