Search Publications
DustPedia: the relationships between stars, gas, and dust for galaxies residing in different environments
Bianchi, S.; Fritz, J.; Madden, S. C. +20 more
We use a sub-set of the DustPedia galaxy sample (461 galaxies) to investigate the effect the environment has had on galaxies. We consider Virgo cluster and field samples and also assign a density contrast parameter to each galaxy, as defined by the local density of SDSS galaxies. We consider their chemical evolution (using MDust/MB…
The fate of the interstellar medium in early-type galaxies. I. First direct measurement of the timescale of dust removal
Frayer, D. T.; Michałowski, M. J.; Hughes, D. H. +12 more
Context. An important aspect of quenching star formation is the removal of the cold interstellar medium (ISM; non-ionised gas and dust) from a galaxy. In addition, dust grains can be destroyed in a hot or turbulent medium. The adopted timescale of dust removal usually relies on uncertain theoretical estimates. It is tricky to track dust removal be…
GIARPS High-resolution Observations of T Tauri stars (GHOsT). I. Jet line emission
Munari, U.; Bacciotti, F.; Fedele, D. +9 more
Context. The mechanism for jet formation in the disks of T Tauri stars remains poorly understood. Observational benchmarks to launching models can be provided by tracing the physical properties of the kinematic components of the wind and jet in the inner 100 au of the disk surface.
Aims: In the framework of the GIARPS High-resolution Observat…
Probing the weak wind phenomenon in Galactic O-type giants
Bouret, J. -C.; Pereira, C. B.; Marcolino, W. L. F. +1 more
Aims: Analyses of Galactic late O dwarfs (O8-O9.5V stars) raised the "weak wind problem": spectroscopic mass-loss rates (Ṁ) are up to two orders of magnitude lower than the theoretical values. We investigated the stellar and wind properties of Galactic late O giants (O8-O9.5III stars). These stars have luminosities log (L⋆ / L…
Transit Lyman-α signatures of terrestrial planets in the habitable zones of M dwarfs
Holmström, M.; Lammer, H.; Güdel, M. +6 more
Aims: We modeled the transit signatures in the Lyman-alpha (Ly-α) line of a putative Earth-sized planet orbiting in the habitable zone (HZ) of the M dwarf GJ 436. We estimated the transit depth in the Ly-α line for an exo-Earth with three types of atmospheres: a hydrogen-dominated atmosphere, a nitrogen-dominated atmosphere, and a nitrogen-do…
Launch of a CME-associated eruptive prominence as observed with IRIS and ancillary instruments
Vial, J. -C.; Zhang, P.; Buchlin, É.
Aims: In this paper we focus on the possible observational signatures of the processes which have been put forward for explaining eruptive prominences. We also try to understand the variations in the physical conditions of eruptive prominences and estimate the masses leaving the Sun versus the masses returning to the Sun during eruptive promi…
GIADA microbalance measurements on board Rosetta: submicrometer- to micrometer-sized dust particle flux in the coma of comet 67P/Churyumov-Gerasimenko
Fulle, M.; Della Corte, V.; Rotundi, A. +7 more
Context. From August 2014 to September 2016, Rosetta escorted comet 67P/Churyumov-Gerasimenko (67P) during its journey around the Sun. One of the aims of Rosetta was to characterize cometary activity and the consequent formation of dust flux structures in cometary comae.
Aims: We characterize and quantify the submicrometer- to micrometer-size…
A spatio-kinematic model for jets in post-AGB stars
De Marco, O.; Van Winckel, H.; Kamath, D. +1 more
Aims: We aim to determine the geometry, density gradient, and velocity structure of jets in post-asymptotic giant branch (post-AGB) binaries.
Methods: Our high cadence time series of high-resolution optical spectra of jet-creating post-AGB binary systems provide us with a unique tomography of the jet. We determine the spatio-kinematic st…
Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC 10
Lebouteiller, V.; Madden, S. C.; Galliano, F. +9 more
Context. Star formation activity is an important driver of galaxy evolution and is influenced by the physical properties of the interstellar medium. Dwarf galaxies allow us to understand how the propagation of radiation and the physical conditions of the different ISM phases are affected by the low-metallicity environment.
Aims: Our objective…
Collimated radiation in SS 433. Constraints from spatially resolved optical jets and Cloudy modeling of the optical bullets
Dexter, Jason; Waisberg, Idel; Dubus, Guillaume +2 more
Context. The microquasar SS 433 is well known for its precessing, relativistic, and highly collimated baryonic jets, which manifest in its optical spectrum as pairs of hydrogen and helium emission lines moving with large Doppler shifts. Depending on their heating mechanism, the optical jet bullets may serve as a probe of the collimated radiation c…