Search Publications
Dense cores and star formation in the giant molecular cloud Vela C★★★
Hill, T.; Weiss, A.; Csengeri, T. +12 more
Context. The Vela Molecular Ridge is one of the nearest (700 pc) giant molecular cloud (GMC) complexes hosting intermediate-mass (up to early B, late O stars) star formation, and is located in the outer Galaxy, inside the Galactic plane. Vela C is one of the GMCs making up the Vela Molecular Ridge, and exhibits both sub-regions of robust and sub-r…
Thermal properties of slowly rotating asteroids: results from a targeted survey
Geier, S.; Pál, A.; Thizy, O. +51 more
Context. Earlier work suggests that slowly rotating asteroids should have higher thermal inertias than faster rotators because the heat wave penetrates deeper into the subsurface. However, thermal inertias have been determined mainly for fast rotators due to selection effects in the available photometry used to obtain shape models required for the…
Homogeneity of 67P/Churyumov-Gerasimenko as seen by CONSERT: implication on composition and formation
Blum, J.; Vincent, J. -B.; Kofman, W. +3 more
Context. After the landing of Philae, CONSERT probed the nucleus of 67P/Churyumov-Gerasimenko (67P) and observed no heterogeneities at metric scale within the probed part of the small lobe of 67P. Further studies have then quantified the observed homogeneity in terms of maximum permittivity contrast versus the typical size of heterogeneities.
…
The PLATO Solar-like Light-curve Simulator. A tool to generate realistic stellar light-curves with instrumental effects representative of the PLATO mission
Smith, A. M. S.; Samadi, R.; Lebreton, Y. +10 more
Context. ESA's PLATO space mission, to be launched by the end of 2026, aims to detect and characterise Earth-like planets in their habitable zone using asteroseismology and the analysis of the transit events. The preparation of science objectives will require the implementation of hare-and-hound exercises relying on the massive generation of repre…
The double blue-straggler sequence in NGC 2173: an artifact of field contamination
Dalessandro, E.; Bastian, N.; Ferraro, F. R. +3 more
Here we discuss the case of the double blue straggler star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud (LMC) by Li et al. (2018, ApJ, 856, 25). In order to investigate this feature we made use of two Hubble Space Telescope (HST) sets of observations, one (the same one used by Li et al.) prob…
High-precision analysis of binary stars with planets. I. Searching for condensation temperature trends in the HD 106515 system
Jofré, E.; Jaque Arancibia, M.; Saffe, C. +4 more
Aims: We explore for the first time the probable chemical signature of planet formation in the remarkable binary system HD 106515. Star A hosts a massive long-period planet with 9 MJup detected by radial velocity, while there is no planet detected at the B star. We also refine stellar and planetary parameters by using non-solar-sca…
Multi-season optical modulation phased with the orbit of the super-Earth 55 Cancri e
Fossati, L.; Winn, J. N.; Lendl, M. +13 more
Context. 55 Cnc e is a transiting super-Earth orbiting a solar-like star with an orbital period of 17.7 h. In 2011, using the Microvariability and Oscillations in Stars (MOST) space telescope, a quasi-sinusoidal modulation in flux was detected with the same period as the planetary orbit. The amplitude of this modulation was too large to be explain…
Probing Polaris' puzzling radial velocity signals. Pulsational (in-)stability, orbital motion, and bisector variations
Anderson, R. I.
We investigate temporally changing variability amplitudes and the multi-periodicity of the type-I Cepheid Polaris using 161 high-precision radial velocity (RV) and bisector inverse span (BIS) measurements based on optical spectra recorded using Hermes at the 1.2 m Flemish Mercator telescope on La Palma, Canary Islands, Spain. Using an empirical te…
Towards sub-kpc scale kinematics of molecular and ionized gas of star-forming galaxies at z ∼ 1
Chisholm, J.; Schaerer, D.; Dessauges-Zavadsky, M. +4 more
We compare the molecular and ionized gas kinematics of two strongly lensed galaxies at z ∼ 1 that lie on the main sequence at this redshift. The observations were made with ALMA and MUSE, respectively. We derive the CO and [O II] rotation curves and dispersion profiles of these two galaxies. We find a difference between the observed molecular and …
Isochrone-cloud fitting of the extended main-sequence turn-off of young clusters
Bastian, N.; Aerts, C.; Johnston, C. +1 more
Context. Extended main-sequence turn-offs (eMSTOs) are a commonly observed property of young clusters. A global theoretical interpretation for eMSTOs is still lacking, but stellar rotation is considered a necessary ingredient to explain eMSTOs.
Aims: We aim to assess the importance of core-boundary and envelope mixing in stellar interiors for…