Hae
Aineistot 11-20 / 20
Constraining the neutron star equation of state through mass and radius measurements
(2022-11-23)
The equation of state of cold dense matter is not well known. The models for cold dense matter can be constrained through the measurement of neutron stars, as they are the densest directly observable objects in the universe. ...
Observational study of the type IIb supernovae 2017gkk and 2019gaf
(2022-12-13)
Supernova (SN) is bright explosion of a star at the end point of stellar evolution.
Supernova explosions caused by gravitational collapse of the core of the star are
called core-collapse supernovae (CCSNe), which can be ...
UV and Optical Properties of 27 Tidal Disruption Events and Nuclear Transients
(2023-08-21)
I explore the UV/optical properties of 27 tidal disruption events (TDEs), TDE candidates and nuclear transients. Given their dependence on black holes, TDEs are expected to be able to probe quantities such as black hole ...
Exploring the Cosmic History of Star Formation, Metallicity Evolution, and Core-Collapse Supernova Rates
(2023-04-11)
Research on star formation is essential for understanding galaxy evolution and the universe’s evolution. Astronomers can learn about star formation over time by observing core-collapse supernovae and determining their ...
Aktiivisten tähtien aikasarja-analyysi : Roihupurkaukset ja tähdenpilkut
(2022-11-07)
M-sarjan kääpiötähdet ovat pääsarjan pienimpiä tähtiä. Ne voivat olla rakenteeltaan hyvin eksoottisia, mutta ovat silti hyvin yleisiä: jopa 75% kaikista Linnunradan tähdistä on M-kääpiöitä. Arvellaan, että jokaisen M-kääpiön ...
Methane Detection Through Satellite Imaging: Analyzing and Comparing Methane Concentration in Turkmenistan and Finland
(2023-05-30)
Remote sensing by satellites is a growing field of study and has been applied to environmental research, e.g., in detecting greenhouse gases such as methane. Methane has recently been a major concern for industry due to ...
Investigating the connection between optical and very high energy gamma-ray emission of BL Lac objects
(2023-06-06)
In this thesis, I have performed systematic comparison of the occurrence of optical and very high-energy (VHE) gamma-ray high states in BL Lac objects (BL Lacs). BL Lacs are the most numerous extragalactic VHE gamma-ray ...
Analysis of the Balmer series in several exoplanet atmospheres
(2023-09-01)
The study of exoplanet atmospheres is a relatively new research field that requires sophisticated and highly precise instruments. In this thesis, I analyzed the Balmer lines as well as the sodium, Na I, and calcium, Ca II, ...
Photometric and spectroscopic analysis of the interacting supernova 2017dio
(2023-10-09)
Core-collapse supernovae (CCSNe) are the bright explosions of massive stars. During the explosion heavy elements are produced by nuclear burning. One of these products is 56Ni that radioactively decays into 56Co. The ...
Galaxy evolution through the lens of active galactic nuclei, their host galaxies, and environments
(Turun yliopisto, 2024-06-11)
The body of research relayed in this dissertation pertains to investigating the immediate environments of Type I quasars for clues to the formation and evolution of galaxies through observations. The neighboring galaxies ...