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A path towards understanding the rotation-activity relation of M dwarfs with K2 mission, X-ray and UV data
Scholz, A.; Damasso, M.; Stelzer, B. +1 more
We study the relation between stellar rotation and magnetic activity for a sample of 134 bright, nearby M dwarfs observed in the Kepler Two-Wheel (K2) mission during campaigns C0-C4. The K2 light curves yield photometrically derived rotation periods for 97 stars (79 of which without previous period measurement), as well as various measures for act…
Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko. as observed by Rosetta OSIRIS and VIRTIS instruments
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +63 more
Context. Since the orbital insertion of the Rosetta spacecraft, comet 67P/Churyumov-Gerasimenko (67P) has been mapped by OSIRIS camera and VIRTIS spectro-imager, producing a huge quantity of images and spectra of the comet's nucleus.
Aims: The aim of this work is to search for the presence of H2O on the nucleus which, in general, a…
The disappearance of the helium-giant progenitor of the Type Ib supernova iPTF13bvn and constraints on its companion
Maund, J. R.; Eldridge, J. J.
We report and discuss post-explosion observations of supernova iPTF13bvn. We find that the brightness of the supernova (SN) at +740 d is below the level of the pre-explosion source and thus confirm that the progenitor has exploded. We estimate that the late-time brightness is still dominated by the SN, which constrains the magnitude and thus mass …
Towards universal hybrid star formation rate estimators
Boquien, M.; De Looze, I.; Pellegrini, E. +13 more
Context. To compute the star formation rate (SFR) of galaxies from the rest-frame ultraviolet (UV), it is essential to take the obscuration by dust into account. To do so, one of the most popular methods consists in combining the UV with the emission from the dust itself in the infrared (IR). Yet, different studies have derived different estimator…
Comet 67P/Churyumov-Gerasimenko: Close-up on Dust Particle Fragments
Langevin, Y.; Altwegg, K.; Krüger, H. +44 more
The COmetary Secondary Ion Mass Analyser instrument on board ESA's Rosetta mission has collected dust particles in the coma of comet 67P/Churyumov-Gerasimenko. During the early-orbit phase of the Rosetta mission, particles and particle agglomerates have been imaged and analyzed in the inner coma at distances between 100 km and 10 km off the cometa…
Molecular gas in the halo fuels the growth of a massive cluster galaxy at high redshift
Pentericci, L.; Villar-Martín, M.; Dannerbauer, H. +19 more
The largest galaxies in the universe reside in galaxy clusters. Using sensitive observations of carbon monoxide, we show that the Spiderweb galaxy—a massive galaxy in a distant protocluster—is forming from a large reservoir of molecular gas. Most of this molecular gas lies between the protocluster galaxies and has low velocity dispersion, indicati…
The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23
Smail, Ian; Sobral, David; Matthee, Jorryt +4 more
We present the first results from our CAlibrating LYMan α with Hα (CALYMHA) pilot survey at the Isaac Newton Telescope. We measure Lyα emission for 488 Hα selected galaxies at z = 2.23 from High-z Emission Line Survey in the COSMOS and UDS fields with a specially designed narrow-band filter (λc = 3918 Å, Δλ = 52 Å). We find 17 dual Hα-L…
Wave analysis in the atmosphere of Venus below 100-km altitude, simulated by the LMD Venus GCM
Lebonnois, Sébastien; Sugimoto, Norihiko; Gilli, Gabriella
A new simulation of Venus atmospheric circulation obtained with the LMD Venus GCM is described and the simulated wave activity is analyzed. Agreement with observed features of the temperature structure, static stability and zonal wind field is good, such as the presence of a cold polar collar, diurnal and semi-diurnal tides. At the resolution used…
A young star-forming galaxy at z = 3.5 with an extended Lyman α halo seen with MUSE
Bacon, Roland; Blaizot, Jérémy; Brinchmann, Jarle +12 more
Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L*, M⋆ = 6 × 109 M⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (…
Gaia Data Release 1. Reference frame and optical properties of ICRF sources
Holl, B.; Biermann, M.; Hutton, A. +18 more
Context. As part of the data processing for Gaia Data Release 1 (Gaia DR1) a special astrometric solution was computed, the so-called auxiliary quasar solution. This gives positions for selected extragalactic objects, including radio sources in the second realisation of the International Celestial Reference Frame (ICRF2) that have optical counterp…