Search Publications
Modelling the atmosphere of the carbon-rich Mira RU Virginis
Groenewegen, M. A. T.; Hron, J.; Paladini, C. +3 more
Context. We study the atmosphere of the carbon-rich Mira
Aims: The aim of this work is to analyse the atmosphere of the carbon-rich Mira RU Vir with hydrostatic and dynamic models, in this way deepening the knowledge of the dy…
Circumstellar discs in Galactic centre clusters: Disc-bearing B-type stars in the Quintuplet and Arches clusters
Ghez, A. M.; Anderson, J.; Brandner, W. +7 more
We investigate the circumstellar disc fraction as determined from L-band excess observations of the young, massive Arches and Quintuplet clusters residing in the central molecular zone of the Milky Way. The Quintuplet cluster was searched for L-band excess sources for the first time. We find a total of 26 excess sources in the Quintuplet cluster, …
Characteristics of the dust trail of 67P/Churyumov-Gerasimenko: an application of the IMEX model
Srama, R.; Sommer, M.; Agarwal, J. +8 more
Context. Here we describe a new model of the dust streams of comet 67P/Churyumov-Gerasimenko that has been developed using the Interplanetary Meteoroid Environment for Exploration (IMEX). This is a new universal model for recently created cometary meteoroid streams in the inner solar system.
Aims: The model can be used to investigate characte…
A non-LTE analysis of the hot subdwarf O star BD+28°4211. II. The optical spectrum
Latour, M.; Green, E. M.; Fontaine, G. +1 more
We present the second part of our detailed analysis of the hot subdwarf O (sdO) and spectroscopic standard star BD+28°4211, in which we focus on the optical spectrum. This target was selected to revisit the more general question of how reliably the atmospheric parameters of a very hot star can be inferred from optical spectroscopy alone. Given its…
The GALEX Ultraviolet Virgo Cluster Survey (GUViCS). V. Ultraviolet diffuse emission and cirrus properties in the Virgo cluster direction
Bianchi, S.; Duc, P. -A.; Boselli, A. +9 more
Context. The Virgo direction has been observed at many wavelengths in recent years, in particular in the ultraviolet with GALEX. The far ultraviolet (FUV) diffuse light detected by GALEX offers interesting information on the large scale distribution of Galactic dust, owing to the GALEX FUV band sensitivity and resolution.
Aims: We aim to char…
Search for exoplanet around northern circumpolar stars. Four planets around HD 11755, HD 12648, HD 24064, and 8 Ursae Minoris
Kim, S. -L.; Lee, C. -U.; Jeong, G. +7 more
Aims: This program originated as the north pole region extension of the established exoplanet survey using the 1.8 m telescope at Bohyunsan Optical Astronomy Observatory (BOAO). The aim of our paper is to find exoplanets in northern circumpolar stars with a precise radial velocity (RV) survey.
Methods: We selected about 200 northern circ…
X-ray to NIR emission from AA Tauri during the dim state. Occultation of the inner disk and gas-to-dust ratio of the absorber
Schmitt, J. H. M. M.; France, K.; Bouvier, J. +5 more
AA Tau is a well-studied, nearby classical T Tauri star, which is viewed almost edge-on. A warp in its inner disk periodically eclipses the central star, causing a clear modulation of its optical light curve. The system underwent a major dimming event beginning in 2011 caused by an extra absorber, which is most likely associated with additional di…
The Mg i line: a new probe of the atmospheres of evaporating exoplanets
Lecavelier des Etangs, A.; Bourrier, V.; Vidal-Madjar, A.
Transit observations of HD 209458b in the UV revealed signatures of neutral magnesium escaping the planet's upper atmosphere. The absorption detected in the Mg i line provides unprecedented information on the physical conditions at the altitude where the atmospheric blow-off takes place. Here we use a 3D model of atmospheric escape to estimate the…
ALMA detection of [C ii] 158 µm emission from a strongly lensed z = 2.013 star-forming galaxy
Schaerer, D.; Jones, T.; Dessauges-Zavadsky, M. +9 more
Aims: Our objectives are to determine the properties of the interstellar medium (ISM) and of star formation in typical star-forming galaxies at high redshift.
Methods: Following up on our previous multi-wavelength observations with HST, Spitzer, Herschel, and the Plateau de Bure Interferometer (PdBI), we have studied a strongly lensed z …
Ionized gas at the edge of the central molecular zone
Goldsmith, P. F.; Langer, W. D.; Requena-Torres, M. A. +3 more
Context. The edge of the central molecular zone (CMZ) is the location where massive dense molecular clouds with large internal velocity dispersions transition to the surrounding more quiescent and lower CO emissivity region of the Galaxy. Little is known about the ionized gas surrounding the molecular clouds and in the transition region.
Aims…