Search Publications
Exploring the brown dwarf desert with precision radial velocities and Gaia DR3 astrometric orbits
Holl, B.; Sahlmann, J.; Ségransan, D. +4 more
Context. The observed scarcity of brown dwarfs in close orbits (within 10 au) around solar-type stars has posed significant questions about the origins of these substellar companions. These questions not only pertain to brown dwarfs but also impact our broader understanding of planetary formation processes. However, to resolve these formation mech…
Ca triplet metallicities and velocities for 12 globular clusters toward the galactic bulge
Minniti, D.; Saviane, I.; Geisler, D. +6 more
Context. Globular clusters (GCs) are excellent tracers of the formation and early evolution of the Milky Way. The bulge GCs (BGCs) are particularly important because they can reveal vital information about the oldest in situ component of the Milky Way.
Aims: Our aim is to derive the mean metallicities and radial velocities for 13 GCs that lie…
Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI
Woch, J.; Solanki, S. K.; Schou, J. +31 more
Context. The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager on board the Solar Orbiter spacecraft (SO/PHI) and the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) both infer the photospheric magnetic field from polarised light images. SO/PHI is the first magnetograph to move out of …
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XV. The Hα luminosity function of the Virgo cluster
Ferrarese, L.; Boquien, M.; Balogh, M. +17 more
We use a complete set of deep narrow-band imaging data for 384 galaxies gathered during the Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) to derive the first Hα luminosity function of the Virgo cluster within its virial radius. The data, which are sensitive to the emission of a single O-early B ionising star, allow us to cover …
The cosmic DANCe of Perseus. I. Membership, phase-space structure, mass, and energy distributions
Miret-Roig, N.; Bouy, H.; Sarro, L. M. +4 more
Context. Star-forming regions are excellent benchmarks for testing and validating theories of star formation and stellar evolution. The Perseus star-forming region, being one of the youngest (< 10 Myr), closest (280−320 pc), and most studied in the literature, is a fundamental benchmark.
Aims: We aim to study the membership, phase-space st…
Gaia Focused Product Release: Radial velocity time series of long-period variables
Prusti, T.; Mazeh, T.; Zucker, S. +403 more
Context. The third Gaia Data Release (DR3) provided photometric time series of more than 2 million long-period variable (LPV) candidates. Anticipating the publication of full radial-velocity data planned with Data Release 4, this Focused Product Release (FPR) provides radial-velocity time series for a selection of LPV candidates with high-quality …
FU Orionis disk outburst: Evidence for a gravitational instability scenario triggered in a magnetically dead zone
Labadie, L.; Lesur, G.; Monnier, J. D. +10 more
Context. FUors outbursts are a crucial stage of accretion in young stars. However, a complete mechanism at the origin of the outburst still remains missing.
Aims: We aim to constrain the instability mechanism in the star FU Orionis itself by directly probing the size and evolution in time of the outburst region with near-infrared (NIR) interf…
The Close AGN Reference Survey (CARS). A parsec-scale multi-phase outflow in the super-Eddington NLS1 Mrk 1044
Jahnke, K.; Gaspari, M.; Combes, F. +8 more
Context. The interaction between active galactic nuclei (AGNs) and their host galaxies is scarcely resolved. Narrow-line Seyfert 1 (NLS1) galaxies are believed to represent AGN at early stages of their evolution and to allow one to observe feeding and feedback processes at high black hole accretion rates.
Aims: We aim to constrain the propert…
X-ray properties of the white dwarf pulsar eRASSU J191213.9−441044
Marsh, T. R.; Schwope, A.; Pelisoli, I. +5 more
We report X-ray observations of the newly discovered pulsating white dwarf eRASSU J191213.9−441044 with Spectrum Roentgen Gamma and eROSITA (SRG/eROSITA) and XMM-Newton. The new source was discovered during the first eROSITA all-sky survey at a flux level of fX(0.2 − 2.3 keV) = 3.3 × 10−13 erg cm−2 s−1 a…
The first look at narrow-line Seyfert 1 galaxies with eROSITA
Salvato, M.; Buchner, J.; Boller, Th. +6 more
We present the first look at the spectral and timing analysis of narrow-line Seyfert 1 galaxies (NLS1s) with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma (SRG) mission. The sample of approximately 1200 NLS1s was obtained via a cross-match between the first eROSITA All-Sky Survey (eRASS…