Seminaria Instytutowe 2017/2018
Seminaria odbywają się co tydzień, w czwartki o godz. 13:00 w budynku Obserwatorium Astronomicznego UAM przy ul. Słonecznej 36. Osobą odpowiedzialną za ustalanie terminów i tematów wystąpień oraz za przebieg seminariów jest dr hab. Tomasz Kwiatkowski.
Informacje dla prelegentów
21 czerwca 2018
mgr Grzegorz Dudziński (IOA)
The volume of an asteroid shape model, when combined with the size and mass estimates, is essential in bulk density determination – one of the most important physical parameters that allow us to peek inside asteroids and make conclusions about their inner structure. The shape model uncertainty propagates to volume, and analogously to any
other property determined from the model, affecting every conclusion drawn for a population of small bodies under scrutiny. There definitely exists a compelling need for a procedure of quality and uncertainty assessment of asteroid models. I would like to present modelling-technique-independent uncertainty assessment method based on gen-
erating clones of investigated model. By far, the most abun-dant data type for the most numerous target sample is disc-integrated relative photometry in visual bands and the majority of published asteroid models are based solely on it. For that reason the presented method deals with photometric lightcurves and absolute sparse data.
Seminaria Instytutowe 2018/2019
18 października 2018
mgr Monika Kamińska (IOA)
W bieżącym roku akademickim wystąpili:
14 czerwca 2018
dr Milena Ratajczak (IA UWr)
Several aspects of stellar evolution can be tested with B-type stars in eclipsing binary systems. Finding tighter constraints on the value of the convective core overshooting parameter is one of the most valuable among them. Precise photometry and high-resolution spectroscopy with high SNR are required to achieve that goal, but since many of the targets are bright enough, the challenge is fair. The approach to examine the aforementioned aspect of stellar evolution using observations of B-type stars obtained with a wide range of spectrographs, as well as BRITE-Constellation satellites, will be presented.
7 czerwca 2018
dr Magdalena Otulakowska-Hypka (IOA)
The disk instability model attributes the outbursts of dwarf novae to a thermal-viscous instability of their accretion disk, an instability to which nova-like stars are not subject. We aim to test the fundamental prediction of the disk instability model: the separation of cataclysmic variables (CVs) into nova-likes and dwarf novae depending on orbital period and mass transfer rate from the companion. We analyse the lightcurves from a sample of ~130 CVs with a parallax distance in the Gaia DR2 catalogue to derive their average mass transfer rate. The method for converting optical magnitude to mass accretion rate is validated against theoretical lightcurves of dwarf novae. Dwarf novae (resp. nova-likes) are consistently placed in the unstable (resp. stable) region of the orbital period – mass transfer rate plane predicted by the disk instability model. None of the analyzed systems present a challenge to the model. These results are robust against the possible sources of error and bias that we investigated. The disk instability model remains the solid base on which to construct the understanding of accretion processes in cataclysmic variables.
24 maja 2018
mgr Przemysław Mróz (OA UW)
Theories of planet formation predict the existence of a population of unbound (free-floating) planets. Gravitational microlensing provides a unique tool for studying these objects. The first results of Sumi et al. (2011) claimed that Jupiter-mass free-floating planets are as common as main-sequence stars. However, these results appear to disagree with censuses of substellar objects in young clusters and star-forming regions and with predictions of planet formation theories. I will present new results of the analysis of a ten times larger sample of microlensing events discovered by the OGLE-IV survey during the years 2010-2015. They shed new light on the population of free-floating planets.
17 maja 2018
mgr Ewa Kosturkiewicz (IOA)
Wstępne wyniki spektroskopowej kampanii obserwacyjnej gwiazdy delta Ceti w latach 2014 – 2017
10 maja 2018
mgr Krzysztof Langner (IOA)
Transformacja Kustaanheimo-Stiefela (KS) pozwala zregularyzować zagadnienie dwóch ciał i sprowadzić je do liniowej postaci oscylatora harmonicznego. Regularyzacja polega na zmianie zmiennej niezależne (czasu) i pozwala między innymi zwiększyć dokładność obliczeń numerycznych, zwłaszcza w przypadku orbit o dużym mimośrodzie. Transformacja Lissajous pozwala wprowadzić zmienne kąt działanie dla oscylatora harmonicznego. W trakcie prezentacji przedstawione zostanie połączenie obu transformacji, używając formalizmu kanonicznego oraz ich rozszerzenie pozwalające stosować ten formalizm w przypadku orbit z zaburzeniem jawnie zależnym od czasu.
26 kwietnia 2018
dr Agnieszka Słowikowska (CA UMK)
In my talk, I will describe the basic concept of polarimetry as well as the most common use of it as a tool in astronomy. I will present a few polarimeters that are in use at the moment. Additionally, I will discuss our recent polarimetry study of white dwarfs and neutron stars.
19 kwietnia 2018
prof. Andrzej Niedzielski (CA UMK)
Stars beyond the MS are frequently avoided in planet searches because they are known to exhibit various types of variability: RV variations of unknown origin were pointed out to be common in red giants (RGs) by Walker et al. (1989), and multiple pulsation modes are often present. In addition, the rotation of starspots across the stellar disk can affect the spectral line profiles of these stars (Vogt et al. 1987; Walker et al. 1992; Saar & Donahue 1997). However, soon after the first discovery (ι Dra b Frink et al. 2002), searches for planets around stars beyond the MS have become recognised as important in building a complete picture of planet formation and evolution for several reasons. First, they allow extending the reach of the most versatile RV technique, which is not applicable on the MS because of the high effective temperature of the stars and their fast rotation rates, to objects with masses significantly higher than solar (e.g., o UMa, a 3 M⊙ giant with a planet – Sato et al. 2012). Second, the planetary systems around evolved stars are much older than those around MS stars, and therefore they are suitable for long-term dynamical stability considerations. Planetary systems around giants are also subject to changes induced by stellar evolution, and therefore are suitable for studies of star – planet interactions, and last but not least, evolved planetary systems carry information on the initial population of planetary systems to be found around white dwarfs. It is no surprise then that several projects devoted to searches for RV planets that orbit RGs were launched. One of the largest of them is the PennState – Toruń Centre for Astronomy Planet Search (PTPS, Niedzielski et al. 2007; Niedzielski & Wolszczan 2008a,b).
In my talk I will present the sample of PTPS, current status of our planet search and the most recent discoveries. I will also discuss some properties of the exoplanets around evolved stars from the PTPS perspective.
12 kwietnia 2018
prof. Agata Różańska (CAMK)
X-ray astronomy requires satellites to make progress in searching the distribution of hot matter in the Universe. Approximately 15 years period of time is needed for full construction of the flight instrument from the mission concept up to the launch. A new generation X-ray telescope ATHENA (the Advanced Telescope for High Energy Astrophysics) was approved by European Space Agency as a large mission with a launch foreseen in 2028. I will talk about how ATHENA will help us to study Hot and Energetic Universe, and I will present Polish involvement to the mission development.
5 kwietnia 2018
dr Michał Drahus (OA UJ)
Disruptions of asteroids are often viewed as ancient events leading to the
formation of asteroid families and pairs, binary and multiple systems, and
discrete dust bands within the Zodiacal cloud. But thanks to the
remarkable progress in solar system science over the last decade, we can
now directly observe asteroidal disruptions occurring before our eyes.
Various lines of evidence suggest that the disruption can be a consequence
of a rapid rotation resulting from a long-term spin-up, or a result of a
hypervelocity collision with another minor object. Up until recently the
two mechanisms were difficult to distinguish because of the unknown
rotation rates of the disrupting small asteroids, but this has changed
after our team investigated the recently disrupted asteroid P/2012 F5.
Using the Keck II telescope atop Mauna Kea we discovered several fragments
of the object and obtained the highly anticipated measurement of the
rotation rate, which turns out to be the fastest known among active
asteroids and is fast enough to support the rotational disruption
scenario. Further observations with the Hubble Space Telescope have
revealed that the system is in fact the first ultra-young asteroid family
identified to date, and given its likely formation via rotational
disruption, it can also be the first known asteroid family of
non-collisional origin.
22 marca 2018
prof. Agnieszka Kryszczyńska (IOA)
The NEO-DECS web service an open access central service of structured
metadata on NEOs, as well as a platform for collaboration among NEO
researchers, using elements well known in social networking like user
profiles, forum facility, private messaging, etc. Such service shall make
it easy to locate necessary databases and services on NEOs, learn about
forthcoming conferences and workshops, and allow for advertising new
observing programs, telescopes availability, numerical tools, etc.
During the talk I will demonstrate NEO-DECS based on several use cases.
15 marca 2018
Seminarium odwołane
8 marca 2018
prof. Edwin Wnuk (IOA)
Polska Agencja Kosmiczna przygotowała projekt Krajowego Programu Kosmicznego
(KPK) i przedstawiła jego pierwszą wersję w grudniu 2017 r. Po
konsultacjach z różnymi zaineresowanymi środowiskami KPK ma być zatwierdzony
do realizacji w pierwszym kwartale 2018 r., po czym maja być ogłoszone
pierwsze konkursy merytoryczne obejmujące szeroki zakres zagadnień z zakresu
badań kosmicznych, w tym również z zakresu astronomii.
W trakcie wystąpienia seminaryjnego zostaną przedstawione podstawowe
informacje o KPK, zostaną omówione trzy projekty priorytetowe KPK oraz
wymienione zostaną obszary zagadnień, w których zostaną rozpisane konkursy
grantowe. Podane zostaną też podstawowe informacje dotyczące zasad
wnioskowania o projekty KPK oraz informacje o planowanym budżecie KPK.
Przedstawione na seminarium informacje będą dotyczyły głownie obszarów
naukowego i edukacyjnego w KPK.
1 marca 2018
dr Magdalena Polińska (IOA)
We would like to present results for the two objects, GT UMa B which is a part of multiple system and for the eclipsing binary star BD-00 2862. The spectra for the first object were obtained with the spectrograph ESPERO mounted on the 2-m telescope in Rozhen and for the second one with PST1 (Poznań Spectroscopic Telescope 1) located in Borowiec. For those stars we estimated atmospheric parameters, such as: the effective temperature, surface gravity, metallicity and the projected rotational velocity. The observed spectra were compared with the set of synthetic spectra calculated with the iSpec code.
22 lutego 2018
dr Arkadiusz Hypki (IOA)
The amount of data in science which is delivered nowadays increases like never before. It applies for all fields of research. However, physics and astrophysics appear to push the requirements for data storage and analysis to the boundaries. With already existing missions like Gaia and for future projects like LSST the need for reliable and scalable data storage and management is even higher. The amount of data for many projects is too big for simply processing with bash or python scripts. Tools which would allow easy data analysis are crucial in research these days.
BEANS software is a web based, easy to install and maintain, new tool for interactively distributed data analysis. It provides a clear interface for querying, filtering, aggregating, and plotting data from an arbitrary number of datasets and tables.
During the seminar I will present features of the BEANS software and show how it can help scientists to analyze huge datasets.
25 stycznia 2018
dr An-Li Tsai (IOA)
Galactic molecular outflows affect star formation activities in galaxies. This process is important for galaxies evolution. I will talk about case studies on two nearby starburst galaxies NGC 2146 and NGC 3628.
18 stycznia 2018
prof. Joanna Mikołajewska (CAMK)
I will present and discuss recovery of the binary underlying the classical nova of 11 March 1437 recorded by Korean royal astronomers whose age is independently confirmed by proper motion-dating. I will also discuss the physical characteristics and the present evolutionary status of the binary system responsible for the nova outburst based on preliminary results of our ongoing extensive observations.
11 stycznia 2018
prof. Michał Ostrowski (OA UJ)
New gamma-ray observatories: Cherenkov Telescope Array (CTA)
4 stycznia 2018
dr Dagmara Oszkiewicz (IOA)
SANORDA (Service for Archival NEO Orbital and Rotational Data Analysis) is an ESA funded project aimed at archiving light curve and orbital data. In work package WP1200 we focus on determining historical orbits of all NEOs to reproduce their orbital improvement history starting from discovery onwards. The historical orbits may aid better observation planing and improve our understanding of astrometric biases present in the Minor Planet Centre database. We focus on two orbit computation methods: the ranging method and the traditional linearised least squares method. For asteroids with short observational arcs (shortly after discovery) we use ranging method and when the phase space of possible orbital solutions is sufficiently contained (close to Gaussian distribution) we switch to least squares. Those orbital histories are being reproduced for around 17 000 NEAs, which will result in almost 2 000 000 orbits. The project is ongoing and the final database is expected in 2018.
14 grudnia 2017
prof. Sławomir Breiter (IOA)
Poczwórny układ gwiazdowy w rezonansie 1:1
7 grudnia 2017
prof. Piotr Dybczyński (IOA)
O pochodzeniu międzygwiazdowego obiektu A/2017 U1
30 listopada 2017
dr hab. Tomasz Kwiatkowski (IOA)
A new catalogue of asteroid lightcurves
23 listopada 2017
dr Przemysław Bartczak (IOA)
Niepewności modeli planetoid
16 listopada 2017
prof. David Vokrouhlický (Astronomical Institute of Charles University, Prague)
Origin and evolution of short-period comets
9 listopada 2017
dr Krzysztof Kamiński (IOA)
Nowa poznańska kamera satelitarna
26 października 2017
dr Michał Michałowski (IOA)
Pierwsze obserwacje promieniowania wysyłanego przez zderzające się gwiazdy neutronowe – źródło fal grawitacyjnych
19 października 2017
dr Paweł Kankiewicz (IF UJK, Kielce)
Dynamika planetoid na orbitach wstecznych
12 października 2017
dr Anna Marciniak (IOA)
Pierścień wokół planety karłowatej Haumea oraz jej rozmiary, kształt i gęstość z obserwacji zakrycia gwiazdowego
Wystąpienia w roku akademickim 2016/2017:
8 czerwca 2017
mgr Mikołaj Krużyński (IOA)
Obserwacje sztucznych satelitów nie tylko przy użyciu PST2
1 czerwca 2017
dr Toni Santana-Ros (IOA)
Ménage à quatre projektów europejskich związanych z badaniem planetoid
25 maja 2017
mgr Krzysztof Langner (IOA)
Nowe podejście do transformacji Kustaanheimo-Stiefela
18 maja 2017
mgr Ewa Kosturkiewicz (IOA)
Badanie gwiazd pulsujących typu beta Cephei
11 maja 2017
dr Michał Michałowski (IOA)
Pył, galaktyki i błyski gamma
27 kwietnia 2017
mgr Patrycja Bagińska (IOA)
Nowe rentgenowskie: analiza i modelowanie rozbłysków
20 kwietnia 2017
mgr Magda Butkiewicz-Bąk (IOA)
Fotometria planetoid w gęstych polach gwiazdowych
6 kwietnia 2017
dr Anna Marciniak (IOA)
Fotometria, modelowanie i skalowanie planetoid o długich okresach i niskich amplitudach
30 marca 2017
prof. Tadeusz Jopek (IOA)
Spadek łańcuszkowy meteorytu Morasko
23 marca 2017
dr Magdalena Polińska (IOA)
Badania spektroskopowe gwiazd delta Scuti
16 marca 2017
prof. Witold Szczuciński (IG UAM)
Geologiczne i środowiskowe skutki małego uderzenia meteoroidu – wnioski z badań w rejonie Moraska
9 marca 2017
mgr Łukasz Gruszka (IOA)
Wyniki projektu LTDS związanego z dystrybucją czasu lokalnego
2 marca 2017
dr Krzysztof Kamiński (IOA)
Pakiet programów do planowania i redukcji obserwacji astrometrycznych Sztucznych Satelitów Ziemi
23 lutego 2017
dr Przemysław Bartczak, mgr Grzegorz Dudziński (IOA)
GAVIP-GC
dr Wojciech Dimitrow (IOA)
Relacja z „Warsztatów praktycznych ESO”
26 stycznia 2017
mgr Grzegorz Dudziński (IOA)
Status prac nad SAGE; inwersja obserwacji radarowych planetoid
12 stycznia 2017
dr Jerzy Nawrocki (OAG CBK PAN, Borowiec)
Uruchomienie fontanny cezowej w Borowcu
15 grudnia 2016
dr hab. Tomasz Kwiatkowski (IOA)
The olivine-dominated composition of the Eureka family of Mars Trojan asteroids
8 grudnia 2016
dr Krzysztof Kamiński (IOA)
Obserwacje SST za pomocą PST1 i PST2
24 listopada 2016
prof. David Vokrouhlický (Astronomical Institute of Charles University, Prague)
Tilting Saturn during planetary migration
17 listopada 2016
dr Jan Janik (Masaryk University, Brno)
Gorące gwiazdy w Brnie
10 listopada 2016
mgr Filip Berski (IOA)
Bliskie przejście gwiazdy Gliese 710
3 listopada 2016
dr Przemysław Bartczak (IOA)
Wyznaczanie kształtu planetoidy z krzywych zmian blasku i danych radarowych metodą SAGE
27 października 2016
dr Arkadiusz Hypki (Leiden Observatory)
MOCCA – current state and [Breiter] future ahead
20 października 2016
dr Dagmara Oszkiewicz (IOA)
Searching for parent bodies of anomalous HEDs
13 października 2016
dr Magdalena Otulakowska-Hypka (IOA)
Ciasne układy podwójne
6 października 2016
Michał Żołnowski, Grzegorz Duszanowicz, Marcin Gędek,
Michał Kusiak, Rafał Reszelewski (6ROADS)
Obserwacje SST i NEO przy pomocy sieci teleskopów 6ROADS
