People involved

Agnieszka Janiuk

Professor, Group Leader

Agnieszka Janiuk was born and grew up in Warsaw. She studied astronomy at the Physics Department of the Warsaw University, where she received her Master of Science degree in 1998, based on the thesis prepared under the supervision of prof. Bożena Czerny. After that, Agnieszka Janiuk continued her research via PhD program at Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences in Warsaw, and she worked with prof. Czerny on modeling and observations of the accretion processes in AGN and Galactic black hole X-ray binaries (XRBs). As a part of that PhD, she developed a new numerical code for simulating the global structure and time evolution of an unstable accretion disk, which is subject to radiation pressure driven thermal and viscous instabilities. The code is now publicly available under the name GLADIS.

In 2003 Agnieszka Janiuk was a fellow at Max Planck Institute for Astrophysics (MPA) in Garching, Germany. The second postdoctoral fellowship she spent under supervision of prof. Daniel Proga at the University of Nevada, Las Vegas, USA. In 2007, she was awarded a tenure-track contract at NCAC, but in 2010, she moved to join the faculty of the Center for Theoretical Physics of PAS. Since then, she leads her own research group, and has already supervised a number of post-docs, PhD and Master students. In January 2021, she was awarded the full professorship in natural sciences by the President of Poland.

Her current research is mostly devoted to the cosmic explosions named gamma ray bursts. These phenomena share some physical properties with other black hole systems, but they are much more violent and explosive in nature. They are launching ultra-relativistic jets on the cost of black hole rotation and accretion mediated by the strong magnetic fields. In addition, nuclear reactions that occur in the very hot and dense plasmas of their accretion disks, lead to copious emission of neutrinos. Finally, what is now known from gravitational wave observations and their electromagnetic counterparts, many GRBs originate from binary neutron star mergers, whose ejecta are the nucleosynthesis sites for the heaviest elements in the Universe. The theoretical research on GRB in which the CTP PAS group is involved, is based on fully General Relativistic multi-dimensional simulations of accretion and magnetized jet ejections. It also utilized nuclear physics and microphysical properties of the GRB engines, under extreme conditions of mass densities and temperatures.

Gerardo Urrutia Sanchez

Postdoc

Gerardo is a Mexican astrophysicist. He enjoys exploring topics related to high-energy astrophysics, his work is focused on the study of gamma ray bursts by numerical simulations. He obtained his bachelor's degree in physics at the Faculty of Sciences of the University of Mexico (UNAM). Furthermore, he had participated as an instructor and assistant professor of courses at the physics department. Gerardo completed his master of sciences and PhD degree at the Institute of Nuclear Sciences in Mexico City, under the supervision of prof. Fabio De Colle. The topic of his thesis is Special Relativistic Hydrodynamics Simulations of gamma ray bursts, exploring the dynamics and radiation of different models of structured jets. In February 2023, he joined the Astrophysics Group supervised by prof. Agnieszka Janiuk at CTP PAS. Currently, Gerardo is participating in the project "Origin of Gamma Ray Bursts and their large-scale characteristics".

Out of astrophysics, Gerardo enjoys listening to music, playing the guitar, drinking coffee, eating delicious things, riding a bicycle, reading magical realism of Latin Americans, traveling, seeing beagles and cats.

Joseph Saji

PhD Student

Joseph is a passionate astrophysics PhD student with a Master's degree in Physics from Cochin University of Science and Technology, Kerala, India. Following his academic journey, he worked as a research assistant at the Indian Institute of Science Education and Research (IISER-TVM) under Prof. Shabnam Iyyani on observational Gamma Ray Burst (GRB) research for a year and half. His master's thesis focused on a comprehensive statistical study on the X-ray flares in the afterglow of GRBs. Joseph is working with CFT astrophysics group under the supervision of Prof. Agnieszka Janiuk since october 2023, focusing on the project "modeling of kilonova emission".

Joseph enjoys coding and data analysis outside of academia. His interests beyond physics includes a passion for travel, music, and reading.

Pulkit Ojha

PhD Student

Pulkit, born and brought up in Muzaffarpur,in Bihar, India was passionate about learning the physics of universe since primary school. Completing his high school from Kota, Rajasthan, he decided to make a career in academia and joined NISER , a premier research institution in India to pursue Integrated Masters in Physics. During these 5 years, he explored various sections of astrophysics and cosmology through his internships and semester projects. .

For past couple of years, he has been interested in compact object astrophysics. He carried out his master’s thesis on the spin evolution of the millisecond pulsars in neutron star hosting low mass X-ray binaries (NS LMXBs), under the supervision of Prof. Sudip Bhattacharyya from TIFR, Mumbai, India. Currently, he has joined CTP, PAS as a doctoral student under Prof. Agnieszka Janiuk. At CTP, he'll be working with the GLADIS code to study the radiation pressure instabilities in the inner edge of the accretion disk of a neutron star in X-ray binaries.

Apart from academics, he enjoys a lot of other activities , from observing birds outdoors to a good classical music session. He’s trying to continue his passion for Hindustani classical music in Warsaw.

Łukasz Klepczarek

Technical staff