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A box full of chocolates: The rich structure of the nearby stellar halo revealed by Gaia and RAVE
Tian, Hao; Helmi, Amina; Sales, Laura V. +2 more
Context. The hierarchical structure formation model predicts that stellar halos should form, at least partly, via mergers. If this was a predominant formation channel for the Milky Way's halo, imprints of this merger history in the form of moving groups or streams should also exist in the vicinity of the Sun.
Aims: We study the kinematics of …
The State-of-the-art HST Astro-photometric Analysis of the Core of ω Centauri. I. The Catalog
Anderson, J.; Bedin, L. R.; King, I. R. +4 more
We have constructed the most comprehensive catalog of photometry and proper motions ever assembled for a globular cluster (GC). The core of ωCen has been imaged over 650 times through WFC3's UVIS and IR channels for the purpose of detector calibration. There exist from 4 to over 60 exposures through each of 26 filters stretching continuously from …
The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits. IV. Gravitational instability rarely forms wide, giant planets
Moutou, C.; Quanz, S. P.; Henning, T. +34 more
Understanding the formation and evolution of giant planets (≥1 MJup) at wide orbital separation (≥5 AU) is one of the goals of direct imaging. Over the past 15 yr, many surveys have placed strong constraints on the occurrence rate of wide-orbit giants, mostly based on non-detections, but very few have tried to make a direct link with pl…
The structure and variability of Mars dayside thermosphere from MAVEN NGIMS and IUVS measurements: Seasonal and solar activity trends in scale heights and temperatures
Stiepen, Arnaud; Schneider, Nicholas M.; Bougher, Stephen W. +10 more
Mars dayside thermospheric temperature and scale height trends were examined using measurements from the Neutral Gas Ion Mass Spectrometer (NGIMS) and the Imaging Ultraviolet Spectrograph (IUVS) on the Mars Atmosphere Volatile EvolutioN (MAVEN) spacecraft. Average scale heights (over 150-180 km for solar zenith angles ≤75°) from several different …
Radial distribution of dust, stars, gas, and star-formation rate in DustPedia face-on galaxies
Bianchi, S.; Fritz, J.; Madden, S. C. +18 more
Aims: The purpose of this work is the characterization of the radial distribution of dust, stars, gas, and star-formation rate (SFR) in a sub-sample of 18 face-on spiral galaxies extracted from the DustPedia sample.
Methods: This study is performed by exploiting the multi-wavelength DustPedia database, from ultraviolet (UV) to sub-millim…
Interacting neutrinos in cosmology: exact description and constraints
Tram, Thomas; Wong, Yvonne Y. Y.; Oldengott, Isabel M. +1 more
We consider the impact of neutrino self-interactions described by an effective four-fermion coupling on cosmological observations. Implementing the exact Boltzmann hierarchy for interacting neutrinos first derived in [1] into the Boltzmann solver CLASS, we perform a detailed numerical analysis of the effects of the interaction on the cosmic microw…
The VMC survey - XXV. The 3D structure of the Small Magellanic Cloud from Classical Cepheids
Piatti, Andrés E.; de Grijs, Richard; Marconi, Marcella +13 more
The VISTA near-infrared YJKs survey of the Magellanic System (VMC) is collecting deep Ks-band time-series photometry of pulsating stars hosted by the two Magellanic Clouds and their connecting bridge. Here, we present Y, J, Ks light curves for a sample of 717 Small Magellanic Cloud (SMC) Classical Cepheids (CCs). T…
An ALMA Survey of CO Isotopologue Emission from Protoplanetary Disks in Chamaeleon I
Pascucci, Ilaria; Herczeg, Gregory J.; Henning, Thomas +8 more
The mass of a protoplanetary disk limits the formation and future growth of any planet. Masses of protoplanetary disks are usually calculated from measurements of the dust continuum emission by assuming an interstellar gas-to-dust ratio. To investigate the utility of CO as an alternate probe of disk mass, we use ALMA to survey 13CO and …
Constraints on interacting dark energy models from Planck 2015 and redshift-space distortion data
Costa, André A.; Abdalla, E.; Wang, Bin +1 more
We investigate phenomenological interactions between dark matter and dark energy and constrain these models by employing the most recent cosmological data including the cosmic microwave background radiation anisotropies from Planck 2015, Type Ia supernovae, baryon acoustic oscillations, the Hubble constant and redshift-space distortions. We find t…
The search for failed supernovae with the Large Binocular Telescope: constraints from 7 yr of data
Kochanek, C. S.; Stanek, K. Z.; Adams, S. M. +1 more
We report updated results for the first 7 yr of our programme to monitor 27 galaxies within 10 Mpc using the Large Binocular Telescope to search for failed supernovae (SNe) - core collapses of massive stars that form black holes without luminous SNe. In the new data, we identify no new compelling candidates and confirm the existing candidate. Give…