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High-resolution, 3D radiative transfer modelling. III. The DustPedia barred galaxies
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +17 more
Context. Dust in late-type galaxies in the local Universe is responsible for absorbing approximately one third of the energy emitted by stars. It is often assumed that dust heating is mainly attributable to the absorption of ultraviolet and optical photons emitted by the youngest (≤100 Myr) stars. Consequently, thermal re-emission by dust at far-i…
Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. I. Single-lined Spectra
Zhao, Gang; Németh, Péter; Zhao, Jingkun +1 more
182 single-lined hot subdwarf stars are identified by using spectra from the sixth and seventh data releases (DR6 and DR7) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope survey. We classified all the hot subdwarf stars using a canonical classification scheme, and got 89 sdB, 37 sdOB, 26 sdO, 24 He-sdOB, 3 He-sdO, and 3 He-sdB sta…
A multiplicity study of transiting exoplanet host stars. II. Revised properties of transiting planetary systems with companions
Ginski, C.; Southworth, J.; Mancini, L. +2 more
Context. Binarity is a widespread phenomenon around solar-type stars, including the host stars of transiting extrasolar planets.
Aims: We performed a detailed study of six transiting planetary systems with relatively bright stars close enough to affect observations of these systems. These contaminants were characterised in a companion work. <…
First detection of ozone in the mid-infrared at Mars: implications for methane detection
Montmessin, F.; Fedorova, A.; Korablev, O. +9 more
Aims: The ExoMars Trace Gas Orbiter was sent to Mars in March 2016 to search for trace gases diagnostic of active geological or biogenic processes.
Methods: We report the first observation of the spectral features of Martian ozone (O3) in the mid-infrared range using the Atmospheric Chemistry Suite Mid-InfaRed (MIR) channel, a…
An Exact, Generalized Laplace Resonance in the HR 8799 Planetary System
Goździewski, Krzysztof; Migaszewski, Cezary
A system of four super-Jupiter planets around HR 8799 is the first multiplanet configuration discovered via the direct imaging technique. Despite over a decade of research, the system's architecture is still not fully resolved. The main difficulty comes from a still narrow observing window of ∼20 yr that covers small arcs of orbits with periods fr…
Mapping the Escape Fraction of Ionizing Photons Using Resolved Stars: A Much Higher Escape Fraction for NGC 4214
Skillman, Evan D.; Williams, Benjamin F.; Gordon, Karl D. +6 more
We demonstrate a new method for measuring the escape fraction of ionizing photons using Hubble Space Telescope imaging of resolved stars in NGC 4214, a local analog of high-redshift starburst galaxies that are thought to be responsible for cosmic reionization. Specifically, we forward model the UV through near-IR spectral energy distributions of ∼…
Gaia RR Lyrae Stars in Nearby Ultra-faint Dwarf Satellite Galaxies
Walker, Alistair R.; Vivas, A. Katherina; Martínez-Vázquez, Clara
We search for RR Lyrae stars (RRLs) in 27 nearby (<100 kpc) ultra-faint dwarf satellite galaxies using the Gaia DR2 catalog of RRLs. Based on proper motions, magnitudes, and location on the sky, we associate 47 Gaia RRLs with 14 different satellites. Distances based on RRLs are provided for those galaxies. We have identified RRLs for the first …
Extended Hα over compact far-infrared continuum in dusty submillimeter galaxies. Insights into dust distributions and star-formation rates at z ∼ 2
Smail, I.; Thomson, A. P.; Dunlop, J. S. +15 more
By using data from the Atacama Large Millimeter/submillimeter Array and near-infrared (NIR) integral field spectrographs, including both Spectrograph for INtegral Field Observations in the Near Infrared and K-band Multi Object Spectrograph on the Very Large Telescope, we investigate the two-dimensional distributions of Hα and rest-frame far-infrar…
Ice Giant Circulation Patterns: Implications for Atmospheric Probes
de Pater, Imke; Fletcher, Leigh N.; Irwin, Patrick G. J. +4 more
Atmospheric circulation patterns derived from multi-spectral remote sensing can serve as a guide for choosing a suitable entry location for a future in situ probe mission to the Ice Giants. Since the Voyager-2 flybys in the 1980s, three decades of observations from ground- and space-based observatories have generated a picture of Ice Giant circula…
Masses for the seven planets in K2-32 and K2-233. Four diverse planets in resonant chain and the first young rocky worlds
Deleuil, M.; Adibekyan, V.; Sousa, S. G. +18 more
Context. High-precision planetary densities are key pieces of information necessary to derive robust atmospheric properties for extrasolar planets. Measuring precise masses is the most challenging part of this task, especially in multi-planetary systems. The ESO-K2 collaboration focuses on the follow-up of a selection of multi-planetary systems de…