Search Publications
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…
First stellar occultation by the Galilean moon Europa and upcoming events between 2019 and 2021
Maury, A.; Cacella, P.; Lainey, V. +21 more
Context. Bright stellar positions are now known with an uncertainty below 1 mas thanks to Gaia DR2. Between 2019-2020, the Galactic plane will be the background of Jupiter. The dense stellar background will lead to an increase in the number of occultations, while the Gaia DR2 catalogue will reduce the prediction uncertainties for the shadow path. …
Variations on a theme: the puzzling behaviour of Schulte 12
Nazé, Yaël; Mahy, Laurent; Rauw, Gregor +2 more
One of the first massive stars detected in X-rays, Schulte 12 has remained a puzzle in several aspects. In particular, its extreme brightness both in the visible and X-ray ranges is intriguing. Thanks to Swift and XMM-Newton observations covering ∼5000 d, we report the discovery of a regular 108 d modulation in X-ray flux of unknown origin. The mi…
A MUSE study of the inner bulge globular cluster Terzan 9: a fossil record in the Galaxy
Bica, E.; Barbuy, B.; Kamann, S. +5 more
Context. Moderately metal-poor inner bulge globular clusters are relics of a generation of long-lived stars that formed in the early Galaxy. Terzan 9, projected at 4°.12 from the Galactic center, is among the most central globular clusters in the Milky Way, showing an orbit which remains confined to the inner 1 kpc.
Aims…
Resolving the distance controversy for Sharpless 269. A possible kink in the outer arm
Immer, K.; Reid, M. J.; Quiroga-Nuñez, L. H. +2 more
Context. Sharpless 269 (S 269) is one of a few HII regions in the outer spiral arm of the Milky Way with strong water maser emission. Based on data from the Very Long Baseline Interferometry (VLBI) Exploration of Radio Astrometry (VERA) array, two parallax measurements have been published, which differ by nearly 2σ. Each distance estimate supports…