Search Publications
Coma composition of comet 67P/Churyumov-Gerasimenko from radio-wave spectroscopy
Crovisier, J.; Biver, N.; Bockelée-Morvan, D. +11 more
We present the results of a molecular survey of comet 67P/Churyumov-Gerasimenko undertaken with the Institut de RadioAstronomie Millimétrique (IRAM) 30-m radio telescope in November-December 2021, when it had its most favourable apparition in decades. Observations at IRAM 30-m during the 12-16 November period covered 8 GHz bandwidth at 3 mm, 16 GH…
Three-dimensional relation between coronal dimming, filament eruption, and CME. A case study of the 28 October 2021 X1.0 event
Veronig, Astrid M.; Dumbović, Mateja; Temmer, Manuela +4 more
Context. Coronal dimmings are localized regions of reduced emission in the extreme-ultraviolet (EUV) and soft X-rays formed as a result of the expansion and mass loss by coronal mass ejections (CMEs) low in the corona. Distinct relations have been established between coronal dimmings (intensity, area, magnetic flux) and key characteristics of the …
Investigating the amplitude and rotation of the phase spiral in the Milky Way outer disc
McMillan, P. J.; Bensby, T.; Alinder, S.
Context. With data releases from the astrometric space mission Gaia, exploration of the structure of the Milky Way is now possible in unprecedented detail, and has unveiled many previously unknown structures in the Galactic disc and halo. One such feature is the Gaia phase spiral where the stars in the Galactic disc form a spiral density pattern i…
The GAPS Programme at TNG. XLVII. A conundrum resolved: HIP 66074b/Gaia-3b characterised as a massive giant planet on a quasi-face-on and extremely elongated orbit
Scandariato, G.; Pagano, I.; Marzari, F. +37 more
The nearby mid-K dwarf HIP 66074 was recently identified as host to a candidate super-Jupiter companion on a ∼300 day, almost edge-on, orbit, based on Gaia Data Release 3 (DR3) astrometry. Initial attempts at confirming the planetary nature of the signal based on publicly available radial-velocity (RV) observations uncovered an intriguing conundru…
Gas, dust, and the CO-to-molecular gas conversion factor in low-metallicity starbursts
Menten, K. M.; Hunt, L. K.; Ginolfi, M. +19 more
The factor relating CO emission to molecular hydrogen column density, XCO, is still subject to uncertainty, in particular at low metallicity. In this paper, to quantify XCO at two different spatial resolutions, we exploited a dust-based method together with ALMA 12-m and ACA data and H I maps of three nearby metal-poor starbu…
ALMA ACA study of the H2S/OCS ratio in low-mass protostars
Tabone, Benoît; Drozdovskaya, Maria N.; Tychoniec, Łukasz +1 more
Context. The identification of the main sulfur reservoir on its way from the diffuse interstellar medium to the cold dense star-forming cores and, ultimately, to protostars is a long-standing problem. Despite sulfur's astrochemical relevance, the abundance of S-bearing molecules in dense cores and regions around protostars is still insufficiently …
Investigating Gaia EDR3 parallax systematics using asteroseismology of cool giant stars observed by Kepler, K2, and TESS. II. Deciphering Gaia parallax systematics using red clump stars
Khan, S.; Anderson, R. I.; Miglio, A. +2 more
We analyse Gaia EDR3 parallax systematics as a function of magnitude and sky location using a recently published catalogue of 12 500 asteroseismic red-giant star distances. We selected ∼3500 red clump (RC) stars of similar chemical composition as the optimal subsample for this purpose because (1) their similar luminosity allows for straightforward…
The new detection of blue straggler stars in 50 open clusters using Gaia DR3
Chen, Li; Zhong, Jing; Qin, Songmei +1 more
Context. The particularly abundant presence of blue straggler stars (BSS) in Galactic open clusters offers favorable conditions for detailed studies on the statistical properties and the origin of the blue straggler population. With the help of Gaia DR3, the number of identified open clusters continuously increases, and the determination of star c…
A search for the afterglows, kilonovae, and host galaxies of two short GRBs: GRB 211106A and GRB 211227A
Covino, S.; D'Avanzo, P.; Campana, S. +30 more
Context. GRB 211106A and GRB 211227A are two recent gamma-ray bursts (GRBs) whose initial X-ray position enabled us to possibly associate them with bright, low-redshift galaxies (z < 0.7). The prompt emission properties suggest that GRB 211106A is a genuine short-duration GRB and GRB 211227A is a short GRB with extended emission. Therefore, the…
Dynamical masses of two young transiting sub-Neptunes orbiting HD 63433
Pallé, E.; Béjar, V. J. S.; Montes, D. +7 more
Context. Although the number of exoplanets reported in the literature exceeds 5000 so far, only a few dozen of them are young planets (≤900 Myr). However, a complete characterization of these young planets is key to understanding the current properties of the entire population. Hence, it is necessary to constrain the planetary formation processes …