Search Publications
TESS discovery of a super-Earth and two sub-Neptunes orbiting the bright, nearby, Sun-like star HD 22946
Kostov, Veselin B.; Barclay, Thomas; Lester, Kathryn V. +51 more
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of a three-planet system around the bright Sun-like star HD 22946 (V ≈ 8.3 mag), also known as TIC 100990000, located 63 pc from Earth. The system was observed by TESS in Sectors 3, 4, 30, and 31 and two planet candidates, labeled TESS Objects of Interest (TOIs) 411.01 (planet c)…
Comprehensive X-ray view of the active nucleus in NGC 4258
Celotti, A.; Boorman, P. G.; Masini, A. +1 more
Context. The presence of water masers orbiting around the active galactic nucleus (AGN) in NGC 4258, one of the most studied extragalactic objects, has been crucial in developing a detailed picture of its nuclear environment. Nonetheless, its accretion rate and bolometric luminosity are still matter of debate, as there are indications that NGC 425…
APOGEE-2S Mg-Al anti-correlation of the metal-poor globular cluster NGC 2298
Beers, Timothy C.; Minniti, Dante; Lane, Richard R. +6 more
We present detailed elemental abundances and radial velocities of stars in the metal-poor globular cluster (GC) NGC 2298, based on near-infrared high-resolution (R ∼ 22 500) spectra of 12 members obtained during the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) at Las Campanas Observatory as part of the seve…
Kinematics, structure and abundances of supernova remnant 0540-69.3
Lundqvist, P.; Shibanov, Yu. A.; Lundqvist, N.
Aims: Our goal is to investigate the structure, elemental abundances, physical conditions, and the immediate surroundings of supernova remnant 0540-69.3 in the Large Magellanic Cloud.
Methods: Imaging in [O III] and spectroscopic studies through various slits were carried out using European Souther Observatory's Very Large and New Techno…
FilDReaMS. II. Application to the analysis of the relative orientations between filaments and the magnetic field in four Herschel fields
Montier, L.; Ristorcelli, I.; Ferrière, K. +1 more
Context. Both simulations and observations of the interstellar medium show that the study of the relative orientations between filamentary structures and the magnetic field can bring new insight into the role played by magnetic fields in the formation and evolution of filaments and in the process of star formation.
Aims: We provide a first ap…
Chemical exploration of Galactic cold cores
Liu, Tie; Ceccarelli, Cecilia; Juvela, Mika +6 more
Context. A solar-type system starts from an initial molecular core that acquires organic complexity as it evolves. The so-called prestellar cores that can be studied are rare, which has hampered our understanding of how organic chemistry sets in and grows.
Aims: We selected the best prestellar core targets from the cold core catalogue (based …
Measuring the F-corona intensity through time correlation of total and polarized visible light images
Romoli, M.; Naletto, G.; Burtovoi, A. +4 more
We present a new correlation method for deriving the F-corona intensity distribution, which is based on the analysis of the evolution of the total and polarized visible light (VL) images. We studied the one-month variation profiles of the total and polarized brightness acquired with Large Angle Spectrometric COronagraph and found that in some regi…
Properties of IR-selected active galactic nuclei
García Lambas, D.; Alonso, M. V.; Bornancini, C. G. +1 more
Context. Active galactic nuclei (AGNs) of galaxies play an important role in the life and evolution of galaxies through the impact they exert on certain properties and on the evolutionary path of galaxies. It is well known that infrared (IR) emission is useful for selecting galaxies with AGNs, although it has been observed that there is contaminat…
Water ortho-to-para ratio in the coma of comet 67P/Churyumov-Gerasimenko
Encrenaz, T.; Erard, S.; Crovisier, J. +9 more
Context. Abundance ratios of the nuclear-spin isomers of H2O and NH3 have been measured in about two dozen comets, with a mean value corresponding to a nuclear-spin temperature of ~30 K. The real meaning of these unequilibrated nuclear-spin abundance ratios is still debated. However, an equilibrated water ortho-to-para ratio …
Evolution of pits at the surface of 67P/Churyumov-Gerasimenko
Guilbert-Lepoutre, Aurélie; Besse, Sébastien; Benseguane, Selma +6 more
Context. The observation of pits at the surface of comets offers the opportunity to take a glimpse into the properties and the mechanisms that shape a nucleus through cometary activity. If the origin of these pits is still a matter of debate, multiple studies have recently suggested that known phase transitions (such as volatile sublimation or amo…