Search Publications
A wide survey for circumstellar disks in the Lupus complex
Alves, J.; Teixeira, P. S.; Scholz, A.
Previous star formation studies have, out of necessity, often defined a population of young stars confined to the proximity of a molecular cloud. Gaia allows us to examine a wider, three-dimensional structure of nearby star forming regions, leading to a new understanding of their history. We present a wide-area survey covering 494 deg2 …
Apsidal motion in the massive binary HD 152248
Gosset, E.; Rauw, G.; Manfroid, J. +3 more
Context. The eccentric massive binary HD 152248 (also known as V1007 Sco), which hosts two O7.5 III-II(f) stars, is the most emblematic eclipsing O-star binary in the very young and rich open cluster NGC 6231. Its properties render the system an interesting target for studying tidally induced apsidal motion.
Aims: Measuring the rate of apsida…
The widest broadband transmission spectrum (0.38-1.71 µm) of HD 189733b from ground-based chromatic Rossiter-McLaughlin observations
López-Puertas, M.; Nagel, E.; Amado, P. J. +22 more
Multiband photometric transit observations (spectro-photometric) have been used mostly so far to retrieve broadband transmission spectra of transiting exoplanets in order to study their atmospheres. An alternative method was proposed, and has only been used once, to recover broadband transmission spectra using chromatic Rossiter-McLaughlin observa…
High-speed stars: Galactic hitchhikers
Bonifacio, P.; Caffau, E.; Spite, M. +8 more
Context. The search for stars born in the very early stages of the Milky Way star formation history is of paramount importance in the study of the early Universe since their chemistry carries irreplaceable information on the conditions in which early star formation and galaxy buildup took place. The search for these objects has generally taken the…
Stellar coronal X-ray emission and surface magnetic flux
Peter, H.; Zhuleku, J.; Warnecke, J.
Context. Observations show that the coronal X-ray emission of the Sun and other stars depends on the surface magnetic field.
Aims: Using power-law scaling relations between different physical parameters, we aim to build an analytical model to connect the observed X-ray emission to the surface magnetic flux.
Methods: The basis for our mod…
The NGC 346 massive star census. Nitrogen abundances for apparently single, narrow lined, hydrogen core burning B-type stars
Dufton, P. L.; Lennon, D. J.; Evans, C. J. +1 more
Previous analyses of two large spectroscopic surveys of early-type stars in the Large Magellanic Cloud (LMC) have found an excess of nitrogen enriched B-type targets with a ve sin i ≤ 40 km s-1 compared with the predictions of single star evolutionary models that incorporate rotational mixing. By contrast, the number of such …
Relating grain size distributions in circumstellar discs to the spectral index at millimetre wavelengths
Löhne, T.
The excess emission seen in spectral energy distributions (SEDs) is commonly used to infer the properties of the emitting circumstellar dust in protoplanetary and debris discs. Most notably, dust size distributions and details of the collision physics are derived from SED slopes at long wavelengths. This paper reviews the approximations that are c…
Chromospheric activity of nearby Sun-like stars. R'HK index signature of a recent burst of star formation
Gondoin, P.
Context. The chromospheric emission in the cores of the Ca II H & K lines of late-type dwarfs is a well known indicator of magnetic activity that decreases with increasing stellar age.
Aims: I use this indicator to investigate the formation history of nearby G- and early K-type stars with origins at galactocentric distances similar to tha…
Small Bodies: Near and Far Database for thermal infrared observations of small bodies in the Solar System
Szakáts, Róbert; Marton, Gábor; Müller, Thomas +4 more
In this paper, we present the Small Bodies: Near and Far Infrared Database, an easy-to-use tool intended to facilitate the modelling of thermal emission of small bodies of the Solar System. Our database collects measurements of thermal emissions for small Solar System targets that are otherwise available in scattered sources and provides a complet…
The EXOD search for faint transients in XMM-Newton observations: Method and discovery of four extragalactic Type I X-ray bursters
Webb, N. A.; van Leeuwen, J.; Pastor-Marazuela, I. +1 more
Context. The observations carried out with XMM-Newton have produced a very extensive X-ray source catalogue in which the standard pipeline determines the variability of sufficiently bright sources through χ2 and fractional variability tests. Faint sources, however, are not automatically checked for variability, and this means that faint…