Search Publications
Efficient dust radial drift around young intermediate-mass stars
Garufi, Antonio; Pinilla, Paola; Gárate, Matías
The radial velocities and direct imaging observations of exoplanets have suggested that the frequency of giant planets may decrease for intermediate-mass stars (2.5 − 8 M⊙). The key mechanism that could hinder their formation remains unclear. From a theoretical point of view, planet formation around intermediate-mass stars may take plac…
Zero-phase angle asteroid taxonomy classification using unsupervised machine learning algorithms
Alvarez-Candal, A.; Duffard, R.; Colazo, M.
Context. We are in an era of large catalogs and, thus, statistical analysis tools for large data sets, such as machine learning, play a fundamental role. One example of such a survey is the Sloan Moving Object Catalog (MOC), which lists the astrometric and photometric information of all moving objects captured by the Sloan field of view. One great…
Absolute colors and phase coefficients of asteroids
Alvarez-Candal, A.; Colazo, M.; Jimenez Corral, S.
Context. We use the phase curves of small bodies to measure absolute magnitudes and, together with complementary theoretical and laboratory results, to understand the micro- and macroscopic properties of their surfaces. Although we can observe asteroids up to phase angles of about 30 deg, the range of phase angles covered by outer Solar System obj…
Analysis of high-resolution FEROS spectroscopy for a sample of variable B-type stars assembled from TESS photometry
Xiang, Maosheng; Rix, Hans-Walter; Bowman, Dominic M. +8 more
Context. Spectroscopic data are necessary to break degeneracies in the asteroseismic modelling of the interior structure in high- and intermediate-mass stars. With the TESS mission, the number of bright intermediate-mass B-type stars with long photometric light curves that are suitable for detailed asteroseismic studies has increased substantially…
Shape of the outer stellar warp in the Large Magellanic Cloud disk
Subramanian, S.; Saroon, S.
Warps are vertical distortions of the stellar or gaseous disks of galaxies. One of the proposed scenarios for the formation of warps involves tidal interactions among galaxies. A recent study identified a stellar warp in the outer regions of the south-western (SW) disk of the Large Magellanic Cloud (LMC) and suggested that it might have originated…
Photodynamical analysis of the nearly resonant planetary system WASP-148. Accurate transit-timing variations and mutual orbital inclination
Bonfils, X.; Jenkins, J. M.; Laskar, J. +23 more
WASP-148 is a recently announced extra-solar system harbouring at least two giant planets. The inner planet transits its host star. The planets travel on eccentric orbits and are near the 4:1 mean-motion resonance, which implies significant mutual gravitational interactions. In particular, this causes transit-timing variations of a few minutes, wh…
Carina High-contrast Imaging Project for massive Stars (CHIPS). II. O stars in Trumpler 14
Absil, O.; Sana, H.; Bodensteiner, J. +2 more
Context. Most massive stars belong to multiple systems, yet the formation process leading to such high multiplicity remains insufficiently understood. To help constrain the different formation scenarios that exist, insights into the low-mass end of the companion mass function of such stars is crucial. However, this is a challenging endeavour as (s…
Investigating dust properties in AGB wind-ISM interaction regions
De Beck, E.; Mecina, M.; Maercker, M. +1 more
Aims: In this paper, we aim to constrain the dust mass and grain sizes in the interaction regions between the stellar winds and the interstellar medium (ISM) around asymptotic giant branch (AGB) stars. By describing the dust in these regions, we aim to shed light on the role of evolved low-mass stars in the origin of dust in galaxies.
Me…
Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud
Haberl, F.; Maitra, C.
Context. Super-soft X-ray sources were established as a heterogeneous class of objects from observations of the Large Magellanic Cloud (LMC).
Aims: We have searched for new sources of this class in the X-ray images obtained from the XMM-Newton survey of the LMC and additional archival observations.
Methods: We first selected candidates b…
Discovery of new TESS pulsating hot subdwarfs
Balona, L. A.; Krzesinski, J.
Aims: This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches.
Methods: By matching catalogues of hot subdwarfs with TESS targets and using luminosities from Gaìa parallaxes, a list of 1389 candidate hot subdwarfs observed by TESS was created. The perio…