Search Publications
Dust giant: Extended and clumpy star-formation in a massive dusty galaxy at z = 1.38
Trebitsch, Maxime; Daddi, Emanuele; Liu, Daizhong +8 more
We present NOEMA CO (2-1) line and ALMA 870 µm continuum observations of a main-sequence galaxy at z = 1.38. The galaxy was initially deemed a "gas giant" based on the gas mass derived from sub-mm continuum (log(Mgas/M⊙) = 11.20 ± 0.20), however, the gas mass derived from CO (2−1) luminosity brings the gas mass value down to …
Identifying and characterising the population of hot sub-luminous stars with multi-colour MeerLICHT data
Groot, P. J.; Aerts, C.; Ranaivomanana, P. +9 more
Context. Colour-magnitude diagrams reveal a population of blue (hot) sub-luminous objects with respect to the main sequence. These hot sub-luminous stars are the result of evolutionary processes that require stars to expel their obscuring, hydrogen-rich envelopes to reveal the hot helium core. As such, these objects offer a direct window into the …
High-velocity CP2 stars in the Galactic halo
Paunzen, E.; Prišegen, M.; Faltová, N. +2 more
Context. The second subclass of chemically peculiar stars, the CP2 stars, are early-type stars exhibiting anomalous abundances with variable line strengths possibly also accompanied by photometric variability that typically belong to the Galactic disk. However, a small fraction of these objects were recently found to be located far from the Galact…
TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +89 more
Context. TOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have provided measurements of planetary masses that differ by ∼2σ.
Aims: Our aim in this work is to solve the inco…
Low NH3/H2O ratio in comet C/2020 F3 (NEOWISE) at 0.7 au from the Sun
McGuire, Brett A.; Drozdovskaya, Maria N.; Opitom, Cyrielle +7 more
Context. A lower-than-solar elemental nitrogen content has been demonstrated for several comets, including 1P/Halley and 67P/Churyumov-Gerasimenko (67P/C-G) with independent in situ measurements of volatile and refractory budgets. The recently discovered semi-refractory ammonium salts in 67P/C-G are thought to be the missing nitrogen reservoir in …
TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
Bouchy, F.; Stassun, K.; Winn, J. N. +31 more
We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 M⊙ G0 star that is the secondary component in a loose binary system. Based on follow-up radial velocity observations of TOI-858 B with CORALIE on the Swiss 1.2 m telescope and CHIRON on the 1.5 m telescope at the Cerro Tololo Inter-American Observatory (CTIO), we…
NuSTAR and XMM-Newton observations of the binary 4FGL J1405.1-6119. A γ-ray-emitting microquasar?
Fogantini, Federico A.; Combi, Jorge A.; Romero, Gustavo E. +3 more
Context. 4FGL J1405.1−6119 is a high-mass γ-ray-emitting binary that has been studied at several wavelengths. The nature of this type of binary is still under debate, with three possible scenarios usually invoked to explain the origin of the γ-ray emission: collisions between the winds of a rapidly rotating neutron star and its companion, collisio…
The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib
Amado, P. J.; Caballero, J. A.; Pallé, E. +29 more
We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby (d ≈ = 6.25 pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) survey. We determined a planetary minimum mass of Mb sin i = 5.46 ± 0.75 M⊕ and an orbital period of Pb = 36.116 ± 0.029 d, using ~5 yr of CARMENES da…
Reconciling results of 2019 and 2020 stellar occultations on Pluto's atmosphere. New constraints from both the 5 September 2019 event and consistency analysis
Fu, Yanning; Yuan, Ye; Chen, Jian +14 more
A stellar occultation by Pluto on 5 September 2019 yielded positive detections at two separate stations. Using an approach consistent with comparable studies, we derived a surface pressure of 11.478 ± 0.55 µbar for Pluto's atmosphere from the observations of this event. In addition, to avoid potential method inconsistencies when comparing with his…
Spectrum of the secondary component and new orbital elements of the massive triple star δ Ori A
Wade, G. A.; Lovekin, C. C.; Harmanec, P. +13 more
δ Orionis is the closest massive multiple stellar system and one of the brightest members of the Orion OB association. The primary (Aa1) is a unique evolved O star. In this work, we applied a two-step disentangling method to a series of spectra in the blue region (430-450 nm), and we detected spectral lines of the secondary (Aa2). For the first ti…