Search Publications
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…
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 …
Stellar metallicity gradients of Local Group dwarf galaxies
Jablonka, P.; Battaglia, G.; Taibi, S. +5 more
Aims: We explore correlations between the strength of metallicity gradients in Local Group dwarf galaxies and their stellar mass, star formation history timescales, and environment.
Methods: We performed a homogeneous analysis of literature spectroscopic data of red giant stars and determined radial metallicity profiles for 30 Local Grou…
Metallicities in M dwarfs: Investigating different determination techniques
Amado, P. J.; Caballero, J. A.; Reiners, A. +17 more
Deriving metallicities for solar-like stars follows well-established methods, but for cooler stars such as M dwarfs, the determination is much more complicated due to forests of molecular lines that are present. Several methods have been developed in recent years to determine accurate stellar parameters for these cool stars (Teff ≲ 4000…
The iron and oxygen content of LMC Classical Cepheids and its implications for the extragalactic distance scale and Hubble constant. Equivalent width analysis with Kurucz stellar atmosphere models
Mucciarelli, Alessio; Riess, Adam; Yuan, Wenlong +6 more
Context. Classical Cepheids are primary distance indicators and a crucial stepping stone in determining the present-day value of the Hubble constant H0 to the precision and accuracy required to constrain apparent deviations from the ΛCDM Concordance Cosmological Model.
Aims: We measured the iron and oxygen abundances of a statistic…
Uncovering astrometric black hole binaries with massive main-sequence companions with Gaia
Mazeh, T.; Faigler, S.; Shahaf, S. +6 more
Context. In the era of gravitational wave astrophysics and with the precise astrometry of billions of stellar sources, the hunt for compact objects is more alive than ever. Rarely seen massive binaries with a compact object are a crucial phase in the evolution towards compact object mergers. With the upcoming third Gaia data release (DR3), the fir…
The GAPS Programme at TNG. XXXV. Fundamental properties of transiting exoplanet host stars
Baratella, M.; Scandariato, G.; Pagano, I. +38 more
Context. Exoplanetary properties strongly depend on stellar properties: to know the planet with accuracy and precision it is necessary to know the star as accurately and precisely as possible.
Aims: Our immediate aim is to characterize in a homogeneous and accurate way a sample of 27 transiting planet-hosting stars observed within the Global …
The GAPS Programme at TNG. XXXVIII. Five molecules in the atmosphere of the warm giant planet WASP-69b detected at high spectral resolution
Pagano, I.; Fossati, L.; Poretti, E. +32 more
Context. The field of exo-atmospheric characterisation is progressing at an extraordinary pace. Atmospheric observations are now available for tens of exoplanets, mainly hot and warm inflated gas giants, and new molecular species continue to be detected, revealing a richer atmospheric composition than previously expected. Thanks to its warm equili…
The Villafranca catalog of Galactic OB groups. II. From Gaia DR2 to EDR3 and ten new systems with O stars
Maíz Apellániz, J.; Alfaro, E. J.; Barbá, R. H. +4 more
Context. This is the second paper of a series on Galactic OB groups that uses astrometric and photometric data from Gaia and spectral classifications from the Galactic O-Star Spectroscopic Survey (GOSSS) and the Library of Libraries of Massive-star high-Resolution spectra (LiLiMaRlin). The previous paper was based on the second Gaia data release (…