Search Publications
Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
Alonso, R.; Deeg, H.; Erikson, A. +51 more
We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M⋆ = 1.00 ± 0.03 M⊙ and R⋆ = 1.09 ± 0.03 R⊙…
The tilt of the velocity ellipsoid in the Milky Way with Gaia DR2
Helmi, A.; de Zeeuw, P. T.; Posti, L. +1 more
The velocity distribution of stars is a sensitive probe of the gravitational potential of the Galaxy, and hence of its dark matter distribution. In particular, the shape of the dark halo (e.g. spherical, oblate, or prolate) determines velocity correlations, and different halo geometries are expected to result in measurable differences. Here we exp…
Inversion of asteroid photometry from Gaia DR2 and the Lowell Observatory photometric database
Hanuš, J.; Ďurech, J.; Vančo, R.
Context. Rotation properties (spin-axis direction and rotation period) and coarse shape models of asteroids can be reconstructed from their disk-integrated brightness when measured from various viewing geometries. These physical properties are essential for creating a global picture of structure and dynamical evolution of the main belt.
Aims:…
The complex case of MACS J0717.5+3745 and its extended filament: intra-cluster light, galaxy luminosity function, and galaxy orientations
Adami, C.; Martinet, N.; Durret, F. +3 more
Context. The properties of galaxies are known to be affected by their environment, but although galaxies in clusters and groups have been quite thoroughly investigated, little is known about galaxies belonging to filaments of the cosmic web, or about the properties of the filaments themselves.
Aims: Here we investigate the properties of the r…
How the power spectrum of dust continuum images may hide the presence of a characteristic filament width
Miville-Deschênes, M. -A.; André, Ph.; Arzoumanian, D. +6 more
Context. Herschel observations of interstellar clouds support a paradigm for star formation in which molecular filaments play a central role. One of the foundations of this paradigm is the finding, based on detailed studies of the transverse column density profiles observed with Herschel, that nearby molecular filaments share a common inner width …
Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
Henning, Thomas; Nakagawa, Takao; Currie, Thayne +24 more
We present SCExAO/CHARIS 1.1-2.4 µm integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consisting of an A0V primary with two low-mass companions at a projected separation of < 1″. Thanks to the high quality wavefront corrections provided by SCExAO, both com…
The chemistry of stars in the bar of the Milky Way
Schultheis, M.; Rojas-Arriagada, A.; Wegg, C. +1 more
We use a sample of 938 red clump giant stars located in the direction of the Galactic long bar to study the chemistry of Milky Way bar stars. Kinematically separating stars on bar orbits from stars with inner disc orbits, we find that stars on bar-like orbits are more metal rich with a mean iron abundance of ⟨[Fe/H]⟩ = +0.30 compared to ⟨[Fe/H]⟩ =…
Masses, oxygen, and carbon abundances in CHEPS dwarf stars
Jones, H. R. A.; Jenkins, J. S.; Pavlenko, Y. V. +3 more
Context. We report the results from the determination of stellar masses, carbon, and oxygen abundances in the atmospheres of 107 stars from the Calan-Hertfordshire Extrasolar Planet Search (CHEPS) programme. Our stars are drawn from a population with a significantly super-solar metallicity. At least 10 of these stars are known to host orbiting pla…
VIRTIS-H observations of the dust coma of comet 67P/Churyumov-Gerasimenko: spectral properties and color temperature variability with phase and elevation
Kappel, D.; Erard, S.; Crovisier, J. +14 more
We analyze 2-5 µm spectroscopic observations of the dust coma of comet 67P/Churyumov-Gerasimenko obtained with the Visible InfraRed Thermal Imaging Spectrometer (VIRTIS-H) instrument on board Rosetta from 3 June to 29 October 2015 at heliocentric distances rh = 1.24-1.55 AU. The 2-2.5 µm color, bolometric albedo, and color t…
Activity and rotation of the X-ray emitting Kepler stars
Belfiore, A.; Marelli, M.; Poretti, E. +6 more
The relation between magnetic activity and rotation in late-type stars provides fundamental information on stellar dynamos and angular momentum evolution. Rotation-activity studies found in the literature suffer from inhomogeneity in the measurement of activity indexes and rotation periods. We overcome this limitation with a study of the X-ray emi…