Sökning: "Claes Fransson"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Claes Fransson.

1. 1. SN 2011dh and the progenitors of Type IIb supernovae

   Författare :Mattias Ergon; Jesper Sollerman; Claes Fransson; Victor P. Utrobin; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; astronomi;

   Sammanfattning : Core-collapse supernovae (SNe) are the observed events following the collapse of the core of evolved massive stars. The gravitational energy released creates a powerful shock that disrupts the star and ejects the heated material into the surrounding circumstellar medium. The observed properties depend on the mass lost by the star, e.g. LÄS MER

3. 2. The rebirth of Supernova 1987A : a study of the ejecta-ring collision

   Författare :Per Gröningsson; Claes Fransson; John Danziger; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; SN 1987A; circumstellar matter; shock waves; Astronomy and astrophysics; Astronomi och astrofysik; Astronomy; astronomi;

   Sammanfattning : Supernovae are some of the most energetic phenomena in the Universe and they have throughout history fascinated people as they appeared as new stars in the sky. Supernova (SN) 1987A exploded in the nearby satellite galaxy, the Large Magellanic Cloud (LMC), at a distance of only 168,000 light years. LÄS MER

4. 3. Spectral modeling of nebular-phase supernovae

   Författare :Anders Jerkstrand; Claes Fransson; Luc Dessart; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; nucleosynthesis; radiative transfer; massive stars; 1987A; IIP; supernovor; nukleosyntes; spektralmodellering; strålningstransport; massiva stjärnor; 1987A; IIP; Astronomy; astronomi;

   Sammanfattning : Massive stars live fast and die young. They shine furiously for a few million years, during which time they synthesize most of the heavy elements in the universe in their cores. They end by blowing themselves up in a powerful explosion known as a supernova (SN). LÄS MER

5. 4. Modeling of Radio Emission from Supernovae : Application to Type Ia

   Författare :Esha Kundu; Peter Lundqvist; Claes Fransson; Talvikki Hovatta; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supernova; Circumstellar interaction; Radio emission; Astronomy; astronomi;

   Sammanfattning : The interaction of supernova (SN) ejecta with the circumstellar medium (CSM) drives a strong shock wave into the CSM. These shocks are ideal places where effective particle acceleration and magnetic field amplification can take place. LÄS MER

7. 5. Radio emission from supernovae

   Författare :Esha Kundu; Peter Lundqvist; Claes Fransson; Stephen Reynolds; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; radio emission; hydrodynamical simulation; Astronomy; astronomi;

   Sammanfattning : This thesis presents the modeling of radio and X-ray emissions from supernova (SN) shock fronts and hydrodynamical simulations of SN-circumstellar medium (CSM) interaction. The interaction of SN ejecta with the CSM drives a strong shock wave into the CSM. LÄS MER