Search Publications
Polycyclic aromatic hydrocarbons in Seyfert and star-forming galaxies
Rigopoulou, D.; Pereira-Santaella, M.; Alonso-Herrero, A. +3 more
Polycyclic Aromatic Hydrocarbons (PAHs) are carbon-based molecules resulting from the union of aromatic rings and related species, which are likely responsible for strong infrared emission features. In this work, using a sample of 50 Seyfert galaxies (DL < 100 Mpc) we compare the circumnuclear (inner kpc) PAH emission of AGN to that …
3D Morphology of Open Clusters in the Solar Neighborhood with Gaia EDR 3. II. Hierarchical Star Formation Revealed by Spatial and Kinematic Substructures
Tang, Shih-Yun; Pang, Xiaoying; Wang, Long +9 more
We identify members of 65 open clusters in the solar neighborhood using the machine-learning algorithm StarGO based on Gaia EDR3 data. After adding members of 20 clusters from previous studies we obtain 85 clusters, and study their morphology and kinematics. We classify the substructures outside the tidal radius into four categories: filamentary (…
HADES RV Programme with HARPS-N at TNG. XV. Planetary occurrence rates around early-M dwarfs
Rebolo, R.; Ribas, I.; Morales, J. C. +28 more
Aims: We present the complete Bayesian statistical analysis of the HArps-n red Dwarf Exoplanet Survey (HADES), which monitored the radial velocities of a large sample of M dwarfs with HARPS-N at TNG over the last 6 yr.
Methods: The targets were selected in a narrow range of spectral types from M0 to M3, 0.3 M⊙ < M★
Mysterious odd radio circle near the large magellanic cloud - an intergalactic supernova remnant?
Haberl, F.; Umana, G.; Hill, T. +48 more
We report the discovery of J0624-6948, a low-surface brightness radio ring, lying between the Galactic Plane and the large magellanic cloud (LMC). It was first detected at 888 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP), and with a diameter of ~196 arcsec. This source has phenomenological similarities to odd radio circles (OR…
The Great Dimming of Betelgeuse: A Surface Mass Ejection and Its Consequences
Dupree, Andrea K.; Montargès, Miguel; Strassmeier, Klaus G. +7 more
The bright supergiant, Betelgeuse (Alpha Orionis, HD 39801), underwent a historic optical dimming during 2020 January 27-February 13. Many imaging and spectroscopic observations across the electromagnetic spectrum were obtained prior to, during, and subsequent to this dimming event. These observations of Betelgeuse reveal that a substantial surfac…
The GAPS Programme at TNG. XXXVII. A precise density measurement of the young ultra-short period planet TOI-1807 b
Baratella, M.; Mallonn, M.; Scandariato, G. +38 more
Context. Great strides have been made in recent years in the understanding of the mechanisms involved in the formation and evolution of planetary systems. Despite this, many observational findings have not yet been corroborated by astrophysical explanations. A fine contribution to the study of planetary formation processes comes from the study of …
Filament coalescence and hub structure in Mon R2. Implications for massive star and cluster formation
Arzoumanian, D.; Palmeirim, P.; Men'shchikov, A. +3 more
There is growing evidence of the role of hub-filament systems (HFS) in the formation of stars from low to high masses. As of today, however, the detailed structures of these systems are still not well described. Here we study the Mon R2 star-forming region, which has a rich network of filaments joining in a star cluster forming hub, and aim to und…
UV absorption by silicate cloud precursors in ultra-hot Jupiter WASP-178b
Nikolov, Nikolay; Sing, David K.; Stevenson, Kevin B. +6 more
Aerosols have been found to be nearly ubiquitous in substellar atmospheres1-3. The precise temperature at which these aerosols begin to form in exoplanets has yet to be observationally constrained. Theoretical models and observations of muted spectral features indicate that silicate clouds play an important role in exoplanets between at…
MIGHTEE: the nature of the radio-loud AGN population
Prandoni, I.; Bowler, R. A. A.; Marchetti, L. +24 more
We study the nature of the faint radio source population detected in the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Early Science data in the COSMOS field, focusing on the properties of the radio-loud active galactic nuclei (AGNs). Using the extensive multiwavelength data available in the field, we are able to classify 88…
A lensed protocluster candidate at z = 7.66 identified in JWST observations of the galaxy cluster SMACS0723−7327
Dole, H.; Laporte, N.; Zitrin, A. +3 more
Context. According to the current paradigm of galaxy formation, the first galaxies likely formed within large dark matter haloes. The fragmentation of these massive haloes led to the formation of galaxy protoclusters, which are usually composed of one to a few bright objects, surrounded by numerous fainter (and less massive) galaxies. These early …