Search Publications
The first massive compact companion in a wide orbit around a hot subdwarf star
Geier, S.; Heber, U.; Marsh, T. R. +5 more
We report the discovery of the first hot subdwarf B (sdB) star with a massive compact companion in a wide (P = 892.5 ± 60.2 d) binary system. It was discovered based on an astrometric binary solution provided by the Gaia mission Data Release 3. We performed detailed analyses of the spectral energy distribution (SED) as well as spectroscopic follow…
The miniJPAS and J-NEP surveys: Identification and characterization of the Lyα emitter population and the Lyα luminosity function at redshift 2.05 < z < 3.75
Hernán-Caballero, A.; Mendes de Oliveira, C.; Vázquez Ramió, H. +27 more
We present the Lyman-α (Lyα) luminosity function (LF) at 2.05 < z < 3.75, estimated from a sample of 67 Lyα-emitter (LAE) candidates in the Javalambre Physics of the Accelerating Universe Astronomical Survey (J-PAS) pathfinder surveys: miniJPAS and J-NEP. These two surveys cover a total effective area of ∼1.14 deg2 with 54 narrow …
Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO). II. t-SNE portrait of local fossil relics and structures
Beers, Timothy C.; Minniti, Dante; Chiappini, Cristina +7 more
Based on high-quality Apache Point Observatory Galactic Evolution Experiment (APOGEE) DR17 and Gaia DR3 data for 1742 red giants stars within 5 kpc of the Sun and not rotating with the Galactic disk (Vϕ < 100 km s−1), we used the nonlinear technique of unsupervised analysis t-Distributed Stochastic Neighbor Embedding (t-SN…
An extreme-ultraviolet wave associated with the possible expansion of sheared arcades
Yang, Shuhong; Zhang, Liang; Chen, Yao +4 more
Context. Solar extreme-ultraviolet (EUV) waves are propagating disturbances in the corona, and they are usually accompanied with various solar eruptions, from large-scale coronal mass ejections to small-scale coronal jets.
Aims: Generally, it is believed that EUV waves are driven by the rapid expansion of coronal loops overlying the erupting …
Chemo-dynamical tagging in the outskirts: The origins of stellar substructures in the Magellanic Clouds
Monachesi, Antonela; Choi, Yumi; Majewski, Steven R. +12 more
We present the first detailed chemical analysis from APOGEE-2S observations of stars in six regions of recently discovered substructures in the outskirts of the Magellanic Clouds extending to 20° from the Large Magellanic Cloud (LMC) center. We also present, for the first time, the metallicity and α-abundance radial gradients of the LMC and the Sm…
Detailed α abundance trends in the inner Galactic bulge
Schultheis, M.; Ryde, N.; Rich, R. M. +7 more
Context. Until now, heavy interstellar extinction has meant that only a few studies of chemical abundances have been possible in the inner Galactic bulge. However, it is crucial to learn more about this structure in order to better understand the formation and evolution of the centre of the Galaxy and galaxies in general.
Aims: In this paper,…
Simultaneous millimetric and X-ray intraday variability in the radio-quiet AGN MCG+08-11-11
Bianchi, S.; Behar, E.; Petrucci, P. -O. +10 more
Most of the active galactic nuclei (AGN) are radio quiet (RQ) and, differently from radio-loud (RL) AGN, they do not show a signature of large-scale or powerful jets. The physical origin of their radio emission thus remains broadly unclear. The observation of flat and inverted radio spectra at gigahertz frequencies seems to support, however, the p…
26Al gamma rays from the Galaxy with INTEGRAL/SPI
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +2 more
Context. The presence of radioactive 26Al at 1.8 MeV reveals an ongoing process of nucleosynthesis in the Milky Way. Diffuse emission from its decay can be measured with gamma-ray telescopes in space. The intensity, line shape, and spatial distribution of the 26Al emission allow for studies of these nucleosynthesis sources. T…
HARPS radial velocity search for planets in the Scorpius-Centaurus association. A combination with the HARPS and SOPHIE young nearby stars (YNS) surveys
Meunier, N.; Messina, S.; Kiefer, F. +13 more
Context. The Scorpius-Centaurus (Sco-Cen) young and nearby massive star-forming region is particularly well suited for extrasolar planet searches with both direct imaging and radial velocity (RV) techniques. The RV search, however, is challenging, as the stars are faster rotators on average than their older stellar counterparts of similar spectral…
Complete X-ray census of M dwarfs in the solar neighborhood. I. GJ 745 AB: Coronal-hole stars in the 10 pc sample
Güdel, M.; Orlando, S.; Stelzer, B. +4 more
Context. X-ray emission is the most sensitive diagnostic of magnetic activity in M dwarfs and, hence, of the dynamo in low-mass stars. Moreover it is crucial for quantifying the influence of the stellar irradiation on the evolution of planet atmospheres.
Aims: We have embarked in a systematic study of the X-ray emission in a volume-limited sa…