Search Publications
NGTS-28Ab: a short period transiting brown dwarf
Ramsay, Gavin; Jackman, James A. G.; Triaud, Amaury H. M. J. +43 more
We report the discovery of a brown dwarf orbiting a M1 host star. We first identified the brown dwarf within the Next Generation Transit Survey data, with supporting observations found in TESS sectors 11 and 38. We confirmed the discovery with follow-up photometry from the South African Astronomical Observatory, SPECULOOS-S, and TRAPPIST-S, and ra…
Calibrating Nonparametric Morphological Indicators from JWST Images for Galaxies over 0.5 < z < 3
Li, Yubin; Zheng, Xian Zhong; Cui, Qifan +6 more
The measurements of morphological indicators of galaxies are often influenced by a series of observational effects. In this study, we utilize a sample of 832 TNG50 simulated galaxies with log(M */M ⊙)> 9 at 0.5 < z < 3 to investigate the differences in nonparametric morphological indicators (C, A, Gini, M 20
Unveiling [C II] clumps in a lensed star-forming galaxy at z ∼ 3.4
Rodighiero, G.; Zanella, A.; Mainieri, V. +15 more
Context. Observations at UV and optical wavelengths have revealed that galaxies at z ∼ 1 − 4 host star-forming regions, dubbed "clumps", which are believed to form due to the fragmentation of gravitationally unstable, gas-rich disks. However, the detection of the parent molecular clouds that give birth to such clumps is still possible only in a mi…
The environment around young eruptive stars. SPHERE/IRDIS polarimetric imaging of seven protostars
Hales, A.; Ginski, C.; Garufi, A. +11 more
Aims: Eruptive stars are a class of young stellar objects that show an abrupt increase in luminosity. These burst-like episodes are thought to dominate the stellar accretion process during the Class 0 to Class I stage. We present an overview of a survey of seven episodically accreting protostars carried out to study their potentially complex …
The elusive atmosphere of WASP-12 b. High-resolution transmission spectroscopy with CARMENES
López-Puertas, M.; Nagel, E.; Amado, P. J. +19 more
To date, the hot Jupiter WASP-12 b has been the only planet with confirmed orbital decay. The late F-type host star has been hypothesized to be surrounded by a large structure of circumstellar material evaporated from the planet. We obtained two high-resolution spectral transit time series with CARMENES and extensively searched for absorption sign…
Pulsation modeling of the Cepheid Y Ophiuchi with RSP/MESA. Impact of the circumstellar envelope and a high projection factor on the Baade-Wesselink method
Smolec, R.; Moskalik, P.; Hocdé, V. +2 more
Context. Y Ophiuchi (Y Oph) is a classical Cepheid with a pulsation period of P = 17.12 days. This star is reported to be as dim as a Cepheid of about half its pulsation period and it exhibits a low radial velocity and light-curve amplitude. For these reasons, Y Oph is not used to calibrate period-luminosity (PL) relation and its distance remains …
Polycyclic aromatic hydrocarbon emission in galaxies as seen with JWST
Rigopoulou, D.; Hunt, L. K.; Shimizu, T. +6 more
We present a systematic study of mid-infrared spectra of galaxies including star-forming galaxies and active galactic nuclei observed with JWST MIRI-MRS and NIRSpec-IFU. We focus on the relative variations of the 3.3, 6.2, 7.7, 11.3, 12.7, and 17 $\mu$m polycyclic aromatic hydrocarbon (PAH) features within spatially resolved regions of galaxies in…
A sub-Earth-mass planet orbiting Barnard's star
Bouchy, F.; Rebolo, R.; Allende Prieto, C. +37 more
Context. ESPRESSO guaranteed time observations (GTOs) at the 8.2m VLT telescope were performed to look for Earth-like exoplanets in the habitable zone of nearby stars. Barnard's star is a primary target within the ESPRESSO GTO as it is the second closest neighbour to our Sun after the α Centauri stellar system. Aims. We present here a large set of…
The radiative and dynamical impact of clouds in the atmosphere of the hot Jupiter WASP-43 b
Millour, E.; Spiga, A.; Bézard, B. +6 more
Context. Hot Jupiters are tidally locked gaseous exoplanets that exhibit large day-night temperature contrasts. Their cooler nightsides are thought to host clouds, as has been suggested by numerous observations. However, the exact nature of these clouds, their spatial distribution, and their impact on atmospheric dynamics, thermal structure, and s…
Planetary Nebula NGC 2818: Revealing its complex 3D morphology
Boumis, P.; Chiotellis, A.; Derlopa, S. +3 more
We carry out an advanced morpho-kinematic analysis of the Planetary Nebula (PN) NGC 2818, whose complex morphology is described by a basic bipolar component, filamentary structures and a knotty central region. We performed an upgrated 3D Morpho-kinematic (MK) model by employing the SHAPE software, combining for the first time in PNe optical 2D spa…