Sökning: "Type Ia supernovae"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden Type Ia supernovae.

1. 1. Type Ia Supernovae : Homogeneity and Diversity

   Författare :Gabriele Garavini; Ariel Goobar; David Branch; Stockholms universitet; []
   Nyckelord :Physics;

   Sammanfattning : The use of type Ia supernovae as distance estimators has shown that about 75% of the energy content of the universe has a negative equation of state parameter and thus, drives the acceleration of the universe. Constraining the exact nature of this energy is one of the main goals in cosmology. LÄS MER

3. 2. Properties of Type Ia Supernovae : From the (intermediate) Palomar Transient Factory

   Författare :Seméli Papadogiannakis; Ariel Goobar; Rahman Amandius; Ulrich Feindt; Edward Baron; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Type Ia supernovae; cosmology; machine learning; fysik; Physics;

   Sammanfattning : Type Ia Supernovae (SNe) have been used to discover the accelerated expansion of the universe but many open questions remain unanswered. These include the stellar progenitor, extinction and possible systematic trends in the supernova brightness for different host galaxy environments or cosmic time. LÄS MER

4. 3. 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

5. 4. The Circumstellar Environment of Type Ia Supernovae

   Författare :Raphael Ferretti; Rahman Amanullah; Ariel Goobar; Josh Simon; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Type Ia supernovae; extinction; supernova cosmology; fysik; Physics;

   Sammanfattning : Type Ia supernovae (SNe Ia) have proven to be extremely useful for measuring cosmological distances and were used for the discovery of the accelerated expansion of the universe. Although thousands of SNe Ia have been observed to date, many questions surrounding the physics of the explosions and the nature of their progenitor systems remain unanswered. LÄS MER

7. 5. Sources of Dust Extinction in Type Ia Supernovae : Measurements and constraints from X-rays to the Infrared

   Författare :Joel Johansson; Edvard Mörtsell; Ariel Goobar; Rahman Amanullah; Bruno Leibundgut; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; interstellar dust; circumstellar dust; cosmology; fysik; Physics;

   Sammanfattning : The use of Type Ia supernovae (SNe Ia) as distance indicators is essential for studying the expansion history of the Universe and for exploring the nature of dark energy. However, a lack of understanding of the progenitor systems and the empirically derived colour-brightness corrections represent severe limitations for SNe Ia as cosmological probes. LÄS MER