Search Publications
Tracing the Milky Way warp and spiral arms with classical Cepheids
Kovtyukh, V.; Lemasle, B.; Kniazev, A. +10 more
Context. Mapping the Galactic spiral structure is a difficult task since the Sun is located in the Galactic plane and because of dust extinction. For these reasons, molecular masers in radio wavelengths have been used with great success to trace the Milky Way spiral arms. Recently, Gaia parallaxes have helped in investigating the spiral structure …
The mass and size of Herbig disks as seen by ALMA
van Dishoeck, E. F.; Hogerheijde, M. R.; Stapper, L. M. +1 more
Context. Many population studies have been performed over the past decade with the Atacama Large millimeter/submillimeter Array (ALMA) to understand the bulk properties of protoplanetary disks around young stars. The studied populations have mostly consisted of late spectral type (i.e., G, K & M) stars, with relatively few more massive Herbig …
TDCOSMO. IX. Systematic comparison between lens modelling software programs: Time-delay prediction for WGD 2038−4008
Frieman, J.; Treu, T.; Palmese, A. +15 more
The importance of alternative methods for measuring the Hubble constant, such as time-delay cosmography, is highlighted by the recent Hubble tension. It is paramount to thoroughly investigate and rule out systematic biases in all measurement methods before we can accept new physics as the source of this tension. In this study, we perform a check f…
High-precision chemical abundances of Galactic building blocks. The distinct chemical abundance sequence of Sequoia
Hattori, Kohei; Helmi, Amina; Ishigaki, Miho N. +5 more
Context. Sequoia is a retrograde kinematic substructure in the nearby Galactic halo, whose properties are a matter of debate. For example, previous studies do not necessarily agree on the chemical abundances of Sequoia stars, which are important for understanding its nature.
Aims: We characterize the chemical properties of a sample of stars f…
Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076
Alonso, R.; Bouchy, F.; Deleuil, M. +93 more
Context. TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting a bright (G = 8.9 mag), young (340 ± 80 Myr) K-type star. Although a validated planetary system, the orbits of the two outer planets were unconstrained as only two non-consecutive transits were seen in TESS photometry. This left 11 and 7 possible period aliases for each…
An elliptical accretion disk following the tidal disruption event AT 2020zso
Gromadzki, M.; Young, D.; Inserra, C. +25 more
Aims: The modelling of spectroscopic observations of tidal disruption events (TDEs) to date suggests that the newly formed accretion disks are mostly quasi-circular. In this work we study the transient event AT 2020zso, hosted by an active galactic nucleus (AGN; as inferred from narrow emission line diagnostics), with the aim of characterisin…
The GAPS Programme at TNG. XXXII. The revealing non-detection of metastable He I in the atmosphere of the hot Jupiter WASP-80b
Scandariato, G.; Pagano, I.; Khodachenko, M. L. +38 more
Context. Because of its proximity to an active K-type star, the hot Jupiter WASP-80b has been identified as a possible excellent target for detecting and measuring He I absorption in the upper atmosphere.
Aims: Our aim was to look for, and eventually measure and model, metastable He I atmospheric absorption.
Methods: We observed four pri…
Strong lensing in UNIONS: Toward a pipeline from discovery to modeling
Scott, D.; Fabbro, S.; Gavazzi, R. +16 more
We present a search for galaxy-scale strong gravitational lenses in the initial 2500 square degrees of the Canada-France Imaging Survey (CFIS). We designed a convolutional neural network (CNN) committee that we applied to a selection of 2 344 002 exquisite-seeing r-band images of color-selected luminous red galaxies. Our classification uses a real…
J-PLUS: Stellar parameters, C, N, Mg, Ca, and [α/Fe] abundances for two million stars from DR1
Xiang, Maosheng; Huang, Yang; Liu, Jifeng +20 more
Context. The Javalambre Photometric Local Universe Survey (J-PLUS) has obtained precise photometry in 12 specially designed filters for large numbers of Galactic stars. Deriving their precise stellar atmospheric parameters and individual elemental abundances is crucial for studies of Galactic structure and the assembly history and chemical evoluti…
The first widespread solar energetic particle event of solar cycle 25 on 2020 November 29. Shock wave properties and the wide distribution of solar energetic particles
Lario, D.; Vainio, R.; Kilpua, E. K. J. +13 more
Context. On 2020 November 29, an eruptive event occurred in an active region located behind the eastern solar limb as seen from Earth. The event consisted of an M4.4 class flare, a coronal mass ejection, an extreme ultraviolet (EUV) wave, and a white-light (WL) shock wave. The eruption gave rise to the first widespread solar energetic particle (SE…