Search Publications
Filaments in the OMC-3 cloud and uncertainties in estimates of filament profiles
Juvela, M.; Mannfors, E.
Context. Filamentary structures are an important part of star-forming interstellar clouds. The properties of filaments hold clues to their formation mechanisms and their role in the star-formation process.
Aims: We compare the properties of filaments in the Orion Molecular Cloud 3 (OMC-3), as seen in mid-infrared (MIR) absorption and far-infr…
Uncovering new white dwarf–open cluster associations using Gaia DR3
Prišegen, M.; Faltová, N.
Context. Open clusters (OCs) provide homogeneous samples of white dwarfs (WDs) with known distances, extinctions, and total ages. The unprecedented astrometric precision of Gaia allows us to identify many novel OC–WD pairs. Studying WDs in the context of their parent OCs makes it possible to determine the properties of WD progenitors and study the…
Spectral energy distributions of classical Cepheids in the Magellanic Clouds
Groenewegen, M. A. T.; Lub, J.
In this study, we constructed spectral energy distributions (SEDs) for a sample of 142 Large Magellanic Cloud (LMC) and 77 Small Magellanic Cloud (SMC) fundamental-mode classical Cepheids (CCs) using photometric data from the literature. When possible, the data were taken to be representative of mean light or averaged over the light curve. The sam…
AutoSourceID-FeatureExtractor. Optical image analysis using a two-step mean variance estimation network for feature estimation and uncertainty characterisation
Groot, P. J.; Vreeswijk, P.; Nelemans, G. +9 more
Aims: In astronomy, machine learning has been successful in various tasks such as source localisation, classification, anomaly detection, and segmentation. However, feature regression remains an area with room for improvement. We aim to design a network that can accurately estimate sources' features and their uncertainties from single-band im…
NAROO program. Precovery observations of potentially hazardous asteroids
Hestroffer, D.; Desmars, J.; Robert, V. +1 more
Context. The New Astrometric Reduction of Old Observations (NAROO) program is dedicated to the measurement of astrophotographic plates and the analysis of old observations for scientific purposes. One of the objectives of the NAROO program is to provide accurate positional measurements of small Solar System bodies in order to improve our knowledge…
Scaling slowly rotating asteroids with stellar occultations
Geier, S.; Urbanik, M.; Pál, A. +176 more
Context. As evidenced by recent survey results, the majority of asteroids are slow rotators (spin periods longer than 12 h), but lack spin and shape models because of selection bias. This bias is skewing our overall understanding of the spins, shapes, and sizes of asteroids, as well as of their other properties. Also, diameter determinations for l…
PENELLOPE. V. The magnetospheric structure and the accretion variability of the classical T Tauri star HM Lup
Kóspál, Á.; Alcalá, J. M.; Manara, C. F. +9 more
HM Lup is a young M-type star that accretes material from a circumstellar disk through a magnetosphere. Our aim is to study the inner disk structure of HM Lup and to characterize its variability. We used spectroscopic data from HST/STIS, X-shooter, and ESPRESSO taken in the framework of the ULLYSES and PENELLOPE programs, together with photometric…
Supersoft luminous X-ray sources in galactic nuclei
Miniutti, G.; Risaliti, G.; Sacchi, A.
Context. Tidal disruption events (TDEs) are usually discovered at X-ray or optical wavelengths through their transient nature. A characteristic spectral feature of X-ray detected TDEs is a `supersoft' X-ray emission, not observed in any other extragalactic source, with the exception of a few rapidly variable hyperluminous X-ray sources (HLXs) or s…
Testing protoplanetary disc evolution with CO fluxes. A proof of concept in Lupus and Upper Sco
Facchini, Stefano; Manara, Carlo F.; Zagaria, Francesco +3 more
The Atacama Large Millimeter/submillimeter Array (ALMA) revolutionised our understanding of protoplanetary discs. However, the available data have not given conclusive answers yet on the underlying disc evolution mechanisms: viscosity or magnetohydrodynamic (MHD) winds. Improving upon the current results, mostly based on the analysis of disc sizes…
The Hubble PanCET program: The near-ultraviolet transmission spectrum of WASP-79b
Lecavelier des Etangs, A.; Bourrier, V.; Sing, D. K. +11 more
We present Hubble Space Telescope (HST) transit observations of the Hot-Jupiter WASP-79 b acquired with the Space Telescope Imaging Spectrograph (STIS) in the near ultraviolet (NUV). Two transit observations, part of the PanCET program, are used to obtain the transmission spectra of the planet between 2280 and 3070 Å. We correct for systematic eff…