Search Publications
Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
Bonifacio, P.; Molaro, P.; Cupani, G. +1 more
Aims. The line of sight toward Sk 143 (AzV 456), an O9.5 Ib star in the Small Magellanic Cloud (SMC), shows significant absorption from neutral atoms and molecules. We report a new study of this line of sight by means of high-resolution spectra obtained with the ESPRESSO spectrograph at the VLT of ESO. Methods. The absorption from neutral and ioni…
Near-infrared observations of outflows and young stellar objects in the massive star-forming region AFGL 5180
Zhang, X.; Zhang, Y.; Telkamp, Z. +30 more
Context. Massive stars play important roles throughout the universe; however, their formation remains poorly understood. Observations of jets and outflows in high-mass star-forming regions, as well as surveys of young stellar object (YSO) content, can help test theoretical models of massive star formation.
Aims: We aim at characterizing the m…
AB Aur, a Rosetta stone for studies of planet formation. III. Continuum observations at 2 and 7 mm
Anglada, G.; Osorio, M.; Neri, R. +7 more
Context. Observational constraints on dust properties in protoplanetary disks are key to better understanding disk evolution, their dynamics, and the pathway to planet formation, but also surface chemistry, the main driver of chemical complexity.
Aims: We continue our exploration of the protoplanetary disk around AB Aur by characterizing its …
The impact of third dredge-up on the mass loss of Mira variables
Eriksson, K.; Wolter, U.; Höfner, S. +8 more
Context. The details of the mass-loss process in the late stages of low- and intermediate-mass stellar evolution are not well understood, in particular its dependence on stellar parameters. Mira variables are highly suitable targets for studying this mass-loss process. Aims. Here, we follow up on our earlier finding that a near-to-mid-infrared (NI…
PRODIGE - planet-forming disks in Taurus with NOEMA. I. Overview and first results for 12CO, 13CO, and C18O
Cunningham, N.; Ceccarelli, C.; Henning, Th. +21 more
Context. The physics and chemistry of planet-forming disks are far from being fully understood. To make further progress, both broad line surveys and observations of individual tracers in a statistically significant number of disks are required.
Aims: Our aim is to perform a line survey of eight planet-forming Class II disks in Taurus with th…
X-ray and optical observations of the millisecond pulsar binary PSR J1431–4715
de Martino, D.; Dhillon, V. S.; Rea, N. +7 more
We present the first X-ray observation of the energetic millisecond pulsar binary PSR J1431‑4715, performed with XMM-Newton and complemented with fast optical multi-band photometry acquired with the ULTRACAM instrument at ESO-NTT. It is found as a faint X-ray source without a significant orbital modulation. This contrasts with the majority of syst…
Long-period modulation of the classical T Tauri star CI Tau. Evidence for an eccentric close-in massive planet at 0.17 au
Moutou, C.; Carmona, A.; Bayo, A. +13 more
Context. Detecting planets within protoplanetary disks around young stars is essential for understanding planet formation and evolution. However, planet detection using the radial velocity method faces challenges due to the strong stellar activity in these early stages.
Aims: We detect long-term periodicities in photometric and spectroscopic …
An 'alien' called the Oosterhoff dichotomy?
Rejkuba, M.; Clementini, G.; Ripepi, V. +4 more
Aims. In this Letter we investigate the origin of the Oosterhoff dichotomy in light of recent discoveries related to several ancient merging events of external galaxies with the Milky Way (MW). In particular, we aim to clarify if the subdivision in terms of the Oosterhoff type between Galactic globular clusters (GGCs) and field RR Lyrae (RRLs) can…
JWST imaging of the closest globular clusters: III. Multiple populations along the low-mass main-sequence stars of NGC 6397
Salaris, M.; Apai, D.; Anderson, J. +9 more
Thanks to its exceptional near-infrared photometry, JWST can effectively contribute to the discovery, characterisation, and understanding of multiple stellar populations in globular clusters, especially at low masses where the Hubble Space Telescope (HST) faces limitations. This paper continues the efforts of the JWST GO-1979 programme in explorin…
Revealing faint compact radio jets at redshifts above 5 with very long baseline interferometry
Ghisellini, G.; Giroletti, M.; An, T. +6 more
Context. Over the past two decades, our knowledge of the high-redshift (z > 5) radio quasars has expanded, thanks to dedicated high-resolution very long baseline interferometry (VLBI) observations. Distant quasars provide unique information about the formation and evolution of the first galaxies and supermassive black holes in the Universe. Pow…