Search Publications
Relation between trees of fragmenting granules and supergranulation evolution
Roudier, Th.; Malherbe, J. M.; Rieutord, M. +1 more
Context. The determination of the underlying mechanisms of the magnetic elements diffusion over the solar surface is still a challenge. Understanding the formation and evolution of the solar network (NE) is a challenge, because it provides a magnetic flux over the solar surface comparable to the flux of active regions at solar maximum.
Aims: …
HST Imaging of Dust Structures and Stars in the Ram Pressure Stripped Virgo Spirals NGC 4402 and NGC 4522: Stripped from the Outside In with Dense Cloud Decoupling
Kenney, J.; Tal, T.; Abramson, A. +1 more
We describe and constrain the origins of interstellar medium (ISM) structures likely created by ongoing intracluster medium (ICM) ram pressure stripping in two Virgo Cluster spirals, NGC 4522 and NGC 4402, using Hubble Space Telescope (HST) BVI images of dust extinction and stars, as well as supplementary H I, Hα, and radio continuum images. With …
Wolf-Rayet stars in M81: detection and characterization using GTC/OSIRIS spectra and HST/ACS images
Gómez-González, V. M. A.; Mayya, Y. D.; Rosa-González, D.
We here report the properties of Wolf-Rayet (W-R) stars in 14 locations in the nearby spiral galaxy M81. These locations were found serendipitously while analysing the slit spectra of a sample of ∼150 star-forming complexes, taken using the long-slit and multiobject spectroscopic modes of the OSIRIS instrument at the 10.4-m Gran Telescopio Canaria…
The UBV Color Evolution of Classical Novae. II. Color-Magnitude Diagram
Kato, Mariko; Hachisu, Izumi
We have examined the outburst tracks of 40 novae in the color-magnitude diagram (intrinsic B - V color versus absolute V magnitude). After reaching the optical maximum, each nova generally evolves toward blue from the upper right to the lower left and then turns back toward the right. The 40 tracks are categorized into one of six templates: very f…
Herschel-PACS observations of far-IR lines in young stellar objects. I. [OI] and H2O at 63 µm
Kamp, I.; Eiroa, C.; Montesinos, B. +2 more
Context. Gas plays a major role in the dynamical evolution of young stellar objects (YSOs). Its interaction with the dust is the key to our understanding planet formation later on in the protoplanetary disc stage. Studying the gas content is therefore a crucial step towards understanding YSO and planet formation. Such a study can be made through s…
Temporal variations of Titan's surface with Cassini/VIMS
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +10 more
We analyze Cassini VIMS data of several areas on Titan's surface looking for variations with time. Three of these locations are near the equator (10-30°S), namely Hotei Regio, Tui Regio and Sotra Patera; in some cases changes in brightness and/or in appearance were reported therein. We also investigate a portion of the undifferentiated plains, are…
Mt. Wendelstein imaging of the post-perihelion dust coma of 67P/Churyumov-Gerasimenko in 2015/2016
Hopp, Ulrich; Riffeser, Arno; Kluge, Matthias +3 more
Comet 67P/Churyumov-Gerasimenko (67P) was imaged with the 2 m telescope at Mt. Wendelstein Observatory in the Alps. Coma and tail monitoring was performed during 51 nights between 2015 August 22 and 2016 May 9. The images through r and I Sloan Digital Sky Survey (SDSS) filters show the dust distribution around the comet, while images in the SDSS g…
Mirror modes in the Earth's magnetosheath: Results from a global hybrid-Vlasov simulation
Vainio, Rami; Pfau-Kempf, Yann; Ganse, Urs +5 more
We investigate mirror mode structures in the Earth's magnetosheath using our global kinetic Vlasiator simulation, which models ion behavior through their distribution function and treats electrons as a charge-neutralizing fluid. We follow the evolution of waves as they advect along velocity streamlines through the magnetosheath. We find that mirro…
Planck intermediate results. XXXIV. The magnetic field structure in the Rosette Nebula
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +197 more
Planck has mapped the polarized dust emission over the whole sky, making it possible to trace the Galactic magnetic field structure that pervades the interstellar medium (ISM). We combine polarization data from Planck with rotation measure (RM) observations towards a massive star-forming region, the Rosette Nebula in the Monoceros molecular cloud,…
High-Time Resolution In-situ Investigation of Major Cometary Volatiles around 67P/C-G at 3.1 - 2.3 AU Measured with ROSINA-RTOF
Wurz, P.; Bochsler, P.; Altwegg, K. +32 more
Comets considered to be pristine objects contain key information about the early formation of the solar system. Their volatile components can provide clues about the origin and evolution of gases and ices in the comets. Measurements with ROSINA/RTOF at 67P/Churyumov-Gerasimenko have now allowed, for the first time, a direct in situ high-time resol…