Search Publications
Estimating stellar ages and metallicities from parallaxes and broadband photometry: successes and shortcomings
Feltzing, Sofia; Howes, Louise M.; Lindegren, Lennart +2 more
A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain intrinsic stellar parameters. With the addition of distance information - a prospect made real for more than a billion stars with the second Gaia data relea…
Consistent dust and gas models for protoplanetary disks. IV. A panchromatic view of protoplanetary disks
Waters, L. B. F. M.; Pinte, C.; Ménard, F. +17 more
Context. Consistent modeling of protoplanetary disks requires the simultaneous solution of both continuum and line radiative transfer, heating and cooling balance between dust and gas and, of course, chemistry. Such models depend on panchromatic observations that can provide a complete description of the physical and chemical properties and energy…
ComPRASS: a Combined Planck-RASS catalogue of X-ray-SZ clusters
Arnaud, M.; Melin, J. -B.; Tarrío, P.
We present the first all-sky catalogue of galaxy clusters and cluster candidates obtained from joint X-ray-SZ detections using observations from the Planck satellite and the ROSAT all-sky survey (RASS). The catalogue contains 2323 objects and has been validated by careful cross-identification with previously known clusters. This validation shows t…
Massive star cluster formation and evolution in tidal dwarf galaxies
Weilbacher, Peter M.; Boquien, Médéric; de Grijs, Richard +8 more
Context. The formation of globular clusters remains an open debate. Dwarf starburst galaxies are efficient at forming young massive clusters with similar masses as globular clusters and may hold the key to understanding their formation.
Aims: We study star cluster formation in a tidal debris, including the vicinity of three tidal dwarf galaxi…
The solar chromosphere at millimetre and ultraviolet wavelengths. I. Radiation temperatures and a detailed comparison
De Pontieu, B.; Rezaei, R.; Carlsson, M. +3 more
Solar observations with the Atacama Large Millimeter/submillimeter Array (ALMA) provide us with direct measurements of the brightness temperature in the solar chromosphere. We study the temperature distributions obtained with ALMA Band 6 (in four sub-bands at 1.21, 1.22, 1.29, and 1.3 mm) for various areas at, and in the vicinity of, a sunspot, co…
An estimate of the k2 Love number of WASP-18Ab from its radial velocity measurements
Csizmadia, Sz.; Smith, A. M. S.; Hellard, H.
Context. Increasing our knowledge of the interior structure, composition, and density distribution of exoplanets is crucial to make progress in the understanding of exoplanetary formation, migration and habitability. However, the directly measurable mass and radius values offer little constraint on interior structure, because the inverse problem i…
XMMSL2 J144605.0+685735: a slow tidal disruption event
Read, A. M.; Berger, E.; Komossa, S. +6 more
Aims: We investigate the evolution of X-ray selected tidal disruption events.
Methods: New events are found in near real-time data from XMM-Newton slews, and are monitored by multi-wavelength facilities.
Results: In August 2016, X-ray emission was detected from the galaxy XMMSL2 J144605.0+685735 (also known as 2MASX 14460522+6857311…
Velocity profiles of [CII], [CI], CO, and [OI] and physical conditions in four star-forming regions in the Large Magellanic Cloud
Hughes, Annie; Güsten, Rolf; Okada, Yoko +4 more
Aims: The aim of our study is to investigate the physical properties of the star-forming interstellar medium (ISM) in the Large Magellanic Cloud (LMC) by separating the origin of the emission lines spatially and spectrally. The LMC provides a unique local template to bridge studies in the Galaxy and high redshift galaxies because of its low m…
Multiplicity of Galactic Cepheids from long-baseline interferometry. IV. New detected companions from MIRC and PIONIER observations
Kervella, P.; Anderson, R. I.; Baron, F. +10 more
Aims: We aim at detecting and characterizing the main-sequence companions of a sample of known and suspected Galactic binary Cepheids. The long-term objective is to accurately and independently measure the Cepheid masses and distances.
Methods: We used the multi-telescope interferometric combiners CHARA/MIRC and VLTI/PIONIER to detect an…
Combining multiple structural inversions to constrain the solar modelling problem
Buldgen, G.; Eggenberger, P.; Meynet, G. +12 more
Context. The Sun is the most studied of all stars, which serves as a reference for all other observed stars in the Universe. Furthermore, it also serves the role of a privileged laboratory of fundamental physics and can help us better understand processes occuring in conditions irreproducible on Earth. However, our understanding of our star is cur…