A5092532002- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- History and Developments in Astronomy
- Radio Astronomy Observations and Technology
- Historical Astronomy and Related Studies
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
University of Canterbury
2023-2024
Abstract We reanalyse the Pantheon+ supernova catalogue to compare a cosmology with non-FLRW evolution, timescape cosmology, standard ΛCDM cosmology. To this end, we analyse for geometric comparison between two models. construct covariance matrix be as independent of possible, including independence from FLRW geometry and peculiar velocity respect average evolution. This framework goes far beyond most other definitions model independence. introduce new statistics refine Type Ia (SNe Ia)...
Abstract The James Webb Space Telescope (JWST) is opening new frontiers of transient discovery and follow-up at high redshift. Here we present the a spectroscopically confirmed Type Ia supernova (SN Ia; SN 2023aeax) z = 2.15 with JWST, including NIRCam multiband light curve. 2023aeax lands edge traditional low- cosmology cuts because its blue color (peak rest-frame B − V ∼ −0.3) but normal decline rate (Δ m 15 ( ) 1.25), applying fiducial standardization BayeSN model find luminosity distance...
Abstract Gamma-ray bursts produce afterglows that can be observed across the electromagnetic spectrum and provide insight into nature of their progenitors. While most telescopes observe are designed to rapidly react trigger information, Transiting Exoplanet Survey Satellite (TESS) continuously monitors sections sky at cadences between 30 minutes 200 s. This provides TESS with capability serendipitously observing optical afterglow GRBs. We conduct first extensive search for known GRBs in...
ABSTRACT We present a new, cosmologically model-independent, statistical analysis of the Pantheon$+$ Type Ia Supernovae spectroscopic data set, improving standard methodology adopted by Lane et al. use Tripp equation for supernova standardization alone, thereby avoiding any potential correlation in stretch and colour distributions. compare homogeneous cosmological model, i.e. spatially flat $\Lambda$ cold dark matter ($\Lambda$CDM), timescape cosmology which invokes backreaction...
Dust from core-collapse supernovae (CCSNe), specifically Type IIP SNe, has been suggested to be a significant source of the dust observed in high-redshift galaxies. CCSNe eject large amounts newly formed heavy elements, which can condense into grains cooling ejecta. However, infrared (IR) observations typical generally measure masses that are too small account for production needed at high redshifts. IIn classified by their dense circumstellar medium (CSM), also known exhibit strong IR...
We reanalyse the Pantheon+ supernova catalogue to compare a cosmology with non-FLRW evolution, timescape cosmology, standard $\Lambda$CDM cosmology. To this end, we analyse for geometric comparison between two models. construct covariance matrix be as independent of possible, including independence from FLRW geometry and peculiar velocity respect average evolution. This framework goes far beyond most other definitions model independence. introduce new statistics refine Type Ia (SNe Ia)...
Gamma-ray bursts produce afterglows that can be observed across the electromagnetic spectrum and provide insight into nature of their progenitors. While most telescopes observe are designed to rapidly react trigger information, Transiting Exoplanet Survey Satellite (TESS) continuously monitors sections sky at cadences between 30 minutes 200 seconds. This provides TESS with capability serendipitously observing optical afterglow GRBs. We conduct first extensive search for known GRBs in...