Search Publications
Information content of JWST spectra of WASP-39b
Heng, Kevin; Fisher, Chloe; Lueber, Anna +1 more
Context. The era of James Webb Space Telescope (JWST) transmission spectroscopy of exoplanetary atmospheres commenced with the study of the Saturn-mass gas giant WASP-39b as part of the Early Release Science (ERS) program. WASP-39b was observed using several different JWST instrument modes (NIRCam,, NIRISS, NIRSpec G395H and NIRSpec PRISM) and the…
JOYS+: The link between the ice and gas of complex organic molecules: Comparing JWST and ALMA data of two low-mass protostars
Güdel, M.; Chen, Y.; Henning, Th. +16 more
Context. A rich inventory of complex organic molecules (COMs) has been observed in high abundances in the gas phase toward Class 0 protostars. It has been suggested that these molecules are formed in ices and sublimate in the warm inner envelope close to the protostar. However, only the most abundant COM, methanol (CH3OH), had been firm…
The Pristine Inner Galaxy Survey (PIGS): X. Probing the early chemical evolution of the Sagittarius dwarf galaxy with carbon abundances
Sestito, Federico; Navarro, Julio F.; Martin, Nicolas F. +6 more
We aim to constrain the chemo-dynamical properties of the Sagittarius (Sgr) dwarf galaxy using carbon abundances. At low metal- licities in particular, these properties reveal the early chemical evolution of a system, tracing the contributing supernovae (SNe) and how much of their ejecta eventually made it into the next stellar generation. Our sam…
Identification of the optical emission detected by Gaia with radio structures in parsec-scale active galactic nucleus jets
Lambert, S.; Sol, H.; Pierron, A.
Aims: We investigated the location of the optical emission with respect to the parsec-scale radio structure and attempted to identify whether the optical centroid is coincident with the radio core or a radio component of the jet.
Methods: We used optical Gaia DR3 and 8 GHz ICRF3 positions and a model fitting of 15 GHz imaging by the MOJA…
Euclid preparation: XLIII. Measuring detailed galaxy morphologies for Euclid with machine learning
Altieri, B.; Cimatti, A.; Aghanim, N. +256 more
The Euclid mission is expected to image millions of galaxies at high resolution, providing an extensive dataset with which to study galaxy evolution. Because galaxy morphology is both a fundamental parameter and one that is hard to determine for large samples, we investigate the application of deep learning in predicting the detailed morphologies …
Localising pulsations in the hard X-ray and microwave emission of an X-class flare
Krucker, Säm; Polito, Vanessa; Yu, Sijie +5 more
Aims: The aim of this work is to identify the mechanism driving pulsations in hard X-ray (HXR) and microwave emission during solar flares. Using combined HXR and microwave observations from Solar Orbiter/STIX and EOVSA, we investigate an X1.3 GOES class flare, 2022-03-30T17:21:00, which displays pulsations on timescales evolving from ∼7 s in …
Modelling two energetic storm particle events observed by Solar Orbiter using the combined EUHFORIA and iPATH models
Li, Gang; Poedts, Stefaan; Kouloumvakos, Athanasios +6 more
Context. By coupling the EUropean Heliospheric FORcasting Information Asset (EUHFORIA) and the improved Particle Acceleration and Transport in the Heliosphere (iPATH) models, we model two energetic storm particle (ESP) events originating from the same active region (AR 13088) and observed by Solar Orbiter (SolO) on August 31, 2022, and September 5…
JWST/MIRI unveils the stellar component of the GN20 dusty galaxy overdensity at z = 4.05
Östlin, G.; Colina, L.; Greve, T. R. +24 more
Dusty star-forming galaxies (DSFGs) at z > 2 have been commonly observed in overdense regions, where the merging processes and large halo masses induce rapid gas accretion, triggering star formation rates (SFRs) up to ∼1000 M⊙ yr‑1. Despite the importance of these DSFGs for understanding star formation in the early Univers…
The Pristine Inner Galaxy Survey (PIGS): IX. The largest detailed chemical analysis of very metal-poor stars in the Sagittarius dwarf galaxy
Sestito, Federico; Martin, Nicolas F.; Kordopatis, Georges +16 more
The most metal-poor stars provide valuable insights into the early chemical enrichment history of a system, carrying the chemical imprints of the first generations of supernovae. The most metal-poor region of the Sagittarius dwarf galaxy remains inadequately observed and characterised. To date, only ∼4 stars with [Fe/H] < ‑2.0 have been chemica…
Unveiling the internal structure and formation history of the three planets transiting HIP 29442 (TOI-469) with CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +91 more
Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring the different proposed explanations for the observed bimodality in the radius distribution of close-in exoplanets. One such system is HIP 29442 (TOI-469), an evolved K0V star hosting two super-Earths and one sub-Neptune. We observed HIP 29442 with CHEOPS for …