This talk will present the first results of the MIRI-MRS spectra
of a number of protostars, T Tauri and brown dwarf disks resulting
from the JOYS and MINDS GTO programs. Rich ice spectra are seen in
the cold outer envelopes of protostars hinting at...
Fast inward migration of planetary cores embedded in gaseous
disks is a common problem in the current planet formation paradigm.
Even though dust is ubiquitous in protoplanetary disks, its
dynamical role in the migration history of planetary embryos...
Astronomical transients are signposts of catastrophic events in
space, including the most extreme stellar deaths, stellar tidal
disruptions by supermassive black holes, and mergers of compact
objects. Thanks to new and improved observational...
Abstract: I give new results for
"gravastars'', which are horizonless compact objects that closely
mimic mathematical black holes in their exterior geometry,
but for which g_{00} is always positive. They result
from solving the Tolman...
The magnetospheres and jets of black holes host
collisionless and highly magnetized plasmas. In such plasmas,
relativistic magnetic reconnection may catalyze the release of free
magnetic energy, powering quiescent and – especially – flaring
emission...
The Atacama Cosmology Telescope is a ground-based CMB survey
that has mapped half the millimeter sky at significantly higher
resolution and sensitivity than the Planck satellite. I will
present new ACT results from a 9400 sq.deg. gravitational...
Driven by gravity, galaxies continuously grow through accretion
of smaller systems. Stellar streams are nice illustrations of this
hierarchical build-up, but the accreted stars quickly disperse. I
will present advanced dynamical models that can...
