Search Publications
LBT transmission spectroscopy of HAT-P-12b. Confirmation of a cloudy atmosphere with no significant alkali features
Mallonn, M.; Reiners, A.; Apai, D. +10 more
The hot sub-Saturn-mass exoplanet HAT-P-12b is an ideal target for transmission spectroscopy because of its inflated radius. We observed one transit of the planet with the multi-object double spectrograph (MODS) on the Large Binocular Telescope (LBT) with the binocular mode and obtained an atmosphere transmission spectrum with a wavelength coverag…
A stellar census in globular clusters with MUSE. Extending the CaT-metallicity relation below the horizontal branch and applying it to multiple populations
Brinchmann, Jarle; Weilbacher, Peter M.; Kamann, Sebastian +7 more
Aims: We use the spectra of more than 30 000 red giant branch (RGB) stars in 25 globular clusters (GC), obtained within the MUSE survey of Galactic globular clusters, to calibrate the Ca II triplet metallicity relation and derive metallicities for all individual stars. We investigate the overall metallicity distributions as well as those of t…
High-resolution, 3D radiative transfer modelling. IV. AGN-powered dust heating in NGC 1068
Bianchi, S.; Fritz, J.; Galliano, F. +18 more
The star formation rate and the mass of interstellar medium (ISM) have a high predictive power for the future evolution of a galaxy. Nevertheless, deriving such properties is not straightforward. Dust emission, an important diagnostic of star formation and ISM mass throughout the Universe, can be powered by sources unrelated to ongoing star format…
Correcting for chromatic stellar activity effects in transits with multiband photometric monitoring: application to WASP-52
Granzer, T.; Mallonn, M.; Ribas, I. +5 more
Context. The properties, distribution, and evolution of inhomogeneities on the surface of active stars, such as dark spots and bright faculae, significantly influence the determination of the parameters of an orbiting exoplanet. The chromatic effect they have on transmission spectroscopy, for example, could affect the analysis of data from future …
Asteroid lightcurve inversion with Bayesian inference
Cellino, A.; Muinonen, K.; Penttilä, A. +2 more
Context. We assess statistical inversion of asteroid rotation periods, pole orientations, shapes, and phase curve parameters from photometric lightcurve observations, here sparse data from the ESA Gaia space mission (Data Release 2) or dense and sparse data from ground-based observing programs.
Aims: Assuming general convex shapes, we develop…
Trans-iron Ge, As, Se, and heavier elements in the dwarf metal-poor stars HD 19445, HD 84937, HD 94028, HD 140283, and HD 160617
Spite, M.; Barbuy, B.; Peterson, R. C.
Context. The spectra of unevolved metal-poor halo stars uniquely reflect the elemental abundances incorporated during the earliest Galactic epoch. Their heavy-element content is well understood as the products of neutron capture on iron-peak elements. However, for the lightest trans-iron elements with atomic number 30 < Z < 52, they show str…
The CARMENES search for exoplanets around M dwarfs. Dynamical characterization of the multiple planet system GJ 1148 and prospects of habitable exomoons around GJ 1148 b
Schmitt, J. H. M. M.; Amado, P. J.; Bauer, F. F. +29 more
Context. GJ 1148 is an M-dwarf star hosting a planetary system composed of two Saturn-mass planets in eccentric orbits with periods of 41.38 and 532.02 days.
Aims: We reanalyze the orbital configuration and dynamics of the GJ 1148 multi-planetary system based on new precise radial velocity measurements taken with CARMENES.
Methods: We co…
MAXIMASK and MAXITRACK: Two new tools for identifying contaminants in astronomical images using convolutional neural networks
Bertin, E.; Bouy, H.; Paillassa, M.
In this work, we propose two convolutional neural network classifiers for detecting contaminants in astronomical images. Once trained, our classifiers are able to identify various contaminants, such as cosmic rays, hot and bad pixels, persistence effects, satellite or plane trails, residual fringe patterns, nebulous features, saturated pixels, dif…
44Ti ejecta in young supernova remnants
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +2 more
Context. Tracing unstable isotopes produced in supernova nucleosynthesis provides a direct diagnostic of supernova explosion physics. Theoretical models predict an extensive variety of scenarios, which can be constrained through observations of the abundant isotopes 56Ni and 44Ti. Direct evidence of the latter was previously …
The search for galaxy cluster members with deep learning of panchromatic HST imaging and extensive spectroscopy
Grillo, C.; Rosati, P.; Vanzella, E. +9 more
Context. The next generation of extensive and data-intensive surveys are bound to produce a vast amount of data, which can be efficiently dealt with using machine-learning and deep-learning methods to explore possible correlations within the multi-dimensional parameter space.
Aims: We explore the classification capabilities of convolution neu…