Search Publications
Metallicity of the globular cluster NGC 6388 based on high-resolution spectra of more than 160 giant stars
Bragaglia, Angela; Carretta, Eugenio
News from Gaia on σ Ori E: A case study for the wind magnetic braking process
Eggenberger, P.; Meynet, G.; Mowlavi, N. +8 more
Context.σ Ori E, a massive helium B-type star, shows high surface rotation and a strong surface magnetic field, potentially challenging the process of wind magnetic braking.
Aims: The Gaia satellite provides an accurate distance to σ Ori E and confirms its membership to the σ Ori cluster. We account for these two key pieces of information in …
Superflares on solar-like stars. A new method for identifying the true flare sources in photometric surveys
Solanki, S. K.; Shapiro, A. I.; Usoskin, I. +5 more
Context. Over the past years, thousands of stellar flares have been detected by harvesting data from large photometric surveys. These detections, however, do not account for potential sources of contamination such as background stars or small Solar System objects appearing in the same aperture as the primary target.
Aims: We present a new met…
Accretion variability in RU Lup
Ray, T. P.; Natta, A.; Caratti o Garatti, A. +2 more
Context. The process of accretion in classical T Tauri stars (CTTSs) has been observed to vary on different timescales. Studying this variability is vital to understanding a star's evolution and provides insight into the complex processes at work within, including sources of the veiling present. Understanding the dichotomy between continuum veilin…
CO line observations of OH/IR stars in the inner Galactic Bulge: Characteristics of stars at the tip of the AGB
Blommaert, J. A. D. L.; Ryde, N.; Olofsson, H. +10 more
Context. OH/IR stars are examples of late stellar evolution on the asymptotic giant branch (AGB), and they are, as such, important objects to study. They are also excellent probes of stellar populations, in particular in regions of high interstellar extinction such as the central regions of our Galaxy.
Aims: Our goal is to characterise the st…
Distributions of gas and small and large grains in the LkHα 330 disk trace a young planetary system
Zhu, Z.; Ginski, C.; Rosotti, G. +13 more
Planets that are forming around young stars are expected to leave clear imprints in the distribution of the gas and dust of their parental protoplanetary disks. In this paper, we present new scattered light and millimeter observations of the protoplanetary disk around LkHα 330, using SPHERE/VLT and ALMA, respectively. The scattered-light SPHERE ob…
A CHEOPS-enhanced view of the HD 3167 system
Alonso, R.; Deleuil, M.; Erikson, A. +92 more
Much remains to be understood about the nature of exoplanets smaller than Neptune, most of which have been discovered in compact multi-planet systems. With its inner ultra-short period planet b aligned with the star and two larger outer planets d-c on polar orbits, the multi-planet system HD 3167 features a peculiar architecture and offers the pos…
Living on the edge of the Milky Way's central molecular zone. G1.3 is the more likely candidate for gas accretion into the CMZ
Menten, Karl M.; Kauffmann, Jens; Güsten, Rolf +3 more
Context. The 1°.3 (G1.3) and 1°.6 (G1.6) cloud complexes in the central molecular zone (CMZ) of our Galaxy have been proposed to possibly reside at the intersection region of the X1 and X2 orbits for several reasons. This includes the detection of co-spatial low- and high-velocity clouds, high velocity dispersion, high fractional molecular abundan…
NOEMA observations support a recoiling black hole in 3C 186
Capetti, A.; Castignani, G.; Combes, F. +7 more
3C 186 is a powerful radio-loud quasar (a quasi-stellar object) at the center of a cool-core cluster at z = 1.06. Previous studies have reported evidence for a projected spatial offset of ∼1″ between the isophotal center of the galaxy and the point-source quasi-stellar object (QSO) as well as a spectral shift of ∼2000 km s−1 between the…
An extended scattered light disk around AT Pyx. Possible planet formation in a cometary globule
Schmidt, T. O. B.; Henning, T.; Ginski, C. +35 more
Aims: To understand how the multitude of planetary systems that have been discovered come to be, we need to study systems at different evolutionary stages, with different central stars but also in different environments. The most challenging environment for planet formation may be the harsh UV radiation field of nearby massive stars which qui…