6 papers
An analysis of the Type Ia SN 2024gy and a comparison of different host extinction estimation techniques
Jacco H. Terwel, Kate Maguire, Cillian O'Donnell +38
Type Ia supernovae (SNe Ia) are well-known standardisable candles, and are one of the main ways to measure the distance to their host galaxies. However, extinction due to interstel…
Examining extinction distributions for type Ia supernovae in simulated 3D galaxies
João Duarte, Santiago González-Gaitán, Ana M. Mourão +2
Dust extinction and reddening greatly contribute to type Ia supernovae (SNe Ia) observed color and magnitude variations. The models used to describe the extinction probability dens…
On the impact of the supernova subsamples in reducing the Hubble tension
Gonçalo Martins, Santiago González-Gaitán, João Duarte +1
The persistent 4-6 difference between early- and late-time Hubble constant () measurements, known as the "Hubble tension", is a major problem in modern cosmology. We stu…
Narrow absorption lines from intervening material in supernovae. IV. Type Ia supernovae: Na I D line strength relating to external material and intrinsic properties
Santiago González-Gaitán, Claudia P. Gutiérrez, João Duarte +4
Type Ia supernovae (SNe Ia) are thermonuclear runaways of some white dwarfs in binary systems. They have been extensively studied, yet their progenitor and explosion mechanisms rem…
Narrow absorption lines from intervening material in supernovae. II. Galaxy properties
Santiago González-Gaitán, Claudia P. Gutiérrez, Gonçalo Martins +11
The interstellar medium (ISM) has a number of tracers such as the Na I D 5890, 5896 AA absorption lines that are evident in the spectra of galaxies but also in those of individual…
from multi-waveband galaxy polarimetry in supernovae vicinity
João Rino-Silvestre, Santiago González-Gaitán, Ana Mourão +2
Peculiar dust extinction laws have been reported for some type Ia supernovae (SNe) with the parameter much lower than the average value for the Milky Way (MW) of 3.1. Using o…