2011.10.05
KRZYSZTOF BOLEJKO
Astrophysics Department, University of Oxford
"Precision vs accurate cosmology - how well do we know our Universe?"
Show abstract >
2011.10.12
GEORGI MELIKIDZE
Institut of Astronomy, Zielona Góra
"Is the enigma of the pulsar radio emission solved?"
Show abstract > Various possible physical processes able to provide the observed pulsar radio emission
will be discussed. The successful mechanism should be able to generate the waves capable of
(a) escaping from the pulsar magnetosphere and
(b) satisfying the observational constraints.
The main attention will be paid to the coherent curvature radiation which seems
to be the most appropriate mechanism from the observational point of view. Also, it is the
only possible mechanism that can operate at the low altitudes, where the wave generation region
is most likely located. The sequence of physical processes taking place in the pulsar magnetosphere
that result in generation of the observed radio-emission will be presented.
2011.10.19
DOUG LIN
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, China
"Origin, Structure, and Evolution of Hot Jupiters and Super-Earths"
Show abstract >
In the radial-velocity and transit searches, close-in planets are the first to be found.
These planets are most likely formed at much larger distances from their host stars and migrated to
their present-day location. I will discuss the implication of various recent discoveries including
1) the mass-period distribution of close-in planets, 2) their mass-radius relationship,
3) the mis-alignment of their orbital angular momentum vector and spin vector of their host stars,
4) their atmosphere
5) the dynamical architecture of closely-packed multi-planet systems, and
6) their presence around binary stars. I will discuss relevant and dominant physical processes
which may have led to these features.
Based on these theoretical consideration and population synthesis models, we suggest that
1) sequential core accretion is the dominant mode of planet formation process,
2) planets have considerable mobility, 3) habitable planets are common, and
4) dynamical evolution of planetary systems is an ongoing process.
2011.10.26
EWA ŁOKAS
Copernicus Astronomical Center, Warsaw
"Formation of dwarf spheroidal galaxies in the Local Group"
Show abstract >
I will review two scenarios for the formation of dwarf spheroidal galaxies in the
Local Group: the tidal stirring model and formation by mergers. In both cases the
progenitors are disky dwarfs embedded in dark matter halos. Both scenarios produce
objects with observational features remarkably similar to the classical dSph
satellites of the Milky Way.
2011.11.09
PAWEŁ HAENSEL
Copernicus Astronomical Center, Warsaw
"Equation of state of neutron star cores: progress, problems, and a puzzle"
Show abstract > Pulsar of 1.97 solar masses and equation of state (EOS). Three-body force EOS and
maximum mass of neutron stars.Hyperons in neutron-star cores - a puzzle and its possible
solutions.
2011.11.16
GERALD HANDLER
Copernicus Astronomical Center, Warsaw
"Seismology of Beta Cephei stars, from the ground and from space"
Show abstract >
I review the current status of asteroseismic research on Beta Cephei stars, massive
main sequence pulsators that oscillate in radial and nonradial modes with periods of
a few hours. Ground-based observations yielded robust results on interior rotation,
overall metallicity and convective core size. Advances in theory enabled the derivation of
constraints on stellar model opacities. Given the demonstrable success of the seismic studies
of these stars, some astrophysical problems that might be attacked in the future are discussed,
in particular in the light of the upcoming BRITE-Constellation mission.
2011.11.23
TOMASZ BULIK
Astronomical Obserwatory, Warsaw University
"The CTA site search"
Show abstract > Cherenkov Telescope Array (CTA) is the next generation very high energy observatory.
The planned sensitivity of CTA is
10 times better than the current experiments like, HESS, MAGIC, and VERITAS.
I will describe the requierements for the CTA site, discuss the techniques used in analyzing
the possible locations. Finally I will summarize the current status of the search.
2011.11.30
SZYMON GŁADYSZ
Technion, Haifa
subject to ba announced
Show abstract >
2011.12.07
MAREK BIESIADA
Department of Physics, Silesian University, Katowice
"Strong gravitational lenses as standard rulers in cosmology"
Show abstract >
2011.12.14
KATARZYNA GRZELAK
Institute of Experimental Physics, Warsaw University
"Measurements of neutrino velocity - past, present and future"
Show abstract >
The OPERA experiment has recently presented the result on
the measurement of neutrino velocity. Neutrinos from CERN
were measured to arrive at the Gran Sasso Laboratory
about 60ns earlier than expected assuming they travel
with the speed of light. The details of the OPERA analysis
and the recent updates will be presented together with
the description of previous measurements of neutrino velocity
and plans for the verification of the OPERA result.
2011.12.21
STANISŁAW BAJTLIK
Copernicus Astronomical Center, Warsaw
"What was the last Nobel Prize in Physics given for?"
Show abstract >
2012.01.18
ARKADIUSZ OLECH
Copernicus Astronomical Center, Warsaw
"Dwarf novae in period gap"
Show abstract >
2012.01.25
KRZYSZTOF NALEWAJKO
JILA, Boulder, CO
"Mysterious gamma-ray flare in blazar PKS 1222+216"
Show abstract >
Cherenkov telescope MAGIC detected a Very-High-Energy flare with variability time scale of 10 minutes
in PKS 1222+216. For the first time such a phenomenon was observed in a Flat-Spectrum Radio
Quasar. This poses additional challenges to theoretical interpretations of rapid gamma-ray flares
in blazars. We may need to completely re-think the established picture of parsec-scale AGN jets.
2012.02.01
VASILY BESKIN
Lebedev Institute of Physics, Moscow
"On the mean profiles of radio pulsars"
Show abstract >
We study the influence of the propagation effects on the mean profiles of radio pulsars
including into consideration the transition from geometrical optics to vacuum propagation,
the cyclotron absorption, and the wave refraction simultaneously. The one-to-one correspondence
between the signs of circular polarization and position angle derivative along the profile for
both ordinary and extraordinary waves is predicted. Using the numerical integration we now can
model the main profiles of radio pulsars.
2012.02.08
KENIJ TOMA
Osaka University
"The Role of Relativistic Neutrons in the Production of AGN Jets"
Show abstract >
AGN jets are considered to be produced by injecting magnetic and (or) thermal energies
into the dilute polar region, where the mass loading processes are essential for determining
the jet properties. We discuss the role of the relativistic neutrons escaped from the accretion
flow for the mass loading (as well as thermal energy injection).
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