Search Publications
Estimating the mass of CMEs from the analysis of EUV dimmings
Cremades, H.; Balmaceda, L. A.; Nuevo, F. A. +2 more
Context. Reliable estimates of the mass of coronal mass ejections (CMEs) are required to quantify their energy and predict how they affect space weather. When a CME propagates near the observer's line of sight, these tasks involve considerable errors, which motivated us to develop alternative means for estimating the CME mass.
Aims: We aim at…
ULX contribution to stellar feedback: an intermediate-mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4
Östlin, G.; Hayes, M.; Mas-Hesse, J. M. +5 more
Context. X-ray radiation from accreting compact objects is an important part of stellar feedback. The metal-poor galaxy ESO 338-4 has experienced vigorous starburst during the last <40 Myr and contains some of the most massive super star clusters in the nearby Universe. Given its starburst age and its star-formation rate, ESO 338-4 is one of th…
Gaia-assisted selection of a quasar reddened by dust in an extremely strong damped Lyman-α absorber at z = 2.226
Milvang-Jensen, B.; Fynbo, J. P. U.; Christensen, L. +7 more
Damped Lyman-α absorbers (DLAs) as a class of quasi-stellar object (QSO) absorption-line systems are currently our most important source of detailed information on the cosmic chemical evolution of galaxies. However, the degree to which this information is biased by dust remains to be understood. One strategy is to specifically search for QSOs that…
Constraining the orbit of the planet-hosting binary τ Boötis. Clues about planetary formation and migration
Albrecht, S.; Justesen, A. B.
Context. The formation of planets in compact or highly eccentric binaries and the migration of hot Jupiters are two outstanding problems in planet formation. Detailed characterisation of known systems is important for informing and testing models. The hot Jupiter τ Boo Ab orbits the primary star in the long-period (P ≳ 1000 yr), highly eccentric (…
Near-infrared polarimetric study of near-Earth object 252P/LINEAR: an implication of scattered light from the evolved dust particles
Kwon, Jungmi; Tamura, Motohide; Im, Myungshin +7 more
Context. Comets undergo resurfacing due to solar radiation, while their primordial interiors remain unchanged. Multi-epoch observations of comets enable us to characterize a change in sublimation pattern as a function of heliocentric distance, which in turn provides information on the dust environments of comets.
Aims: We aim to constrain the…
The Arches cluster revisited. III. An addendum to the stellar census
Najarro, F.; Clark, J. S.; Patrick, L. R. +1 more
The Arches is one of the youngest, densest and most massive clusters in the Galaxy. As such it provides a unique insight into the lifecycle of the most massive stars known and the formation and survival of such stellar aggregates in the extreme conditions of the Galactic Centre. In a previous study we presented an initial stellar census for the Ar…
HD 96446: a long-period binary with a strongly magnetic He-rich primary with β Cephei pulsations
Järvinen, S.; González, J. F.; Butler, K. +14 more
Aims: HD 96446 is a magnetic B2p He-strong star that has been reported to be a β Cep pulsator. We present a detailed spectroscopic analysis of this object based on an intensive observational data set obtained in a multisite campaign with the spectrographs CORALIE, FEROS, and HARPS (La Silla); UVES (Paranal); HERCULES (Mt. John Observatory); a…
Discovery of a giant and luminous Lyα+C IV+He II nebula at z = 3.326 with extreme emission line ratios
Pérez-Fournon, I.; Ivison, R. J.; Omont, A. +17 more
We present the discovery of HLock01-LAB, a luminous and large Lyα nebula at z = 3.326. Medium-band imaging and long-slit spectroscopic observations with the Gran Telescopio Canarias reveal extended emission in the Lyα 1215 Å, C IV 1550 Å, and He II 1640 Å lines over ∼100 kpc, and a total luminosity LLyα = (6.4 ± 0.1)×1044 erg…
The extreme O-type spectroscopic binary HD 93129A. A quantitative, multiwavelength analysis
Gruner, D.; Hamann, W. -R.; Oskinova, L. M. +6 more
Context. HD 93129A was classified as the earliest O-type star in the Galaxy (O2 If*) and is considered as the prototype of its spectral class. However, interferometry shows that this object is a binary system, while recent observations even suggest a triple configuration. None of the previous spectral analyses of this object accounted for its mult…
First resolved observations of a highly asymmetric debris disc around HD 160305 with VLT/SPHERE
Boccaletti, Anthony; Ménard, François; Kral, Quentin +36 more
Context. Direct imaging of debris discs gives important information about their nature, their global morphology, and allows us to identify specific structures possibly in connection with the presence of gravitational perturbers. It is the most straightforward technique to observe planetary systems as a whole.
Aims: We present the first resolv…