FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3134765457> ?p ?o ?g. }

• W3134765457 abstract "This thesis investigates the properties of peculiar optical transients discovered by the Dark Energy Survey (DES). DES was an optical sky survey designed to study the nature of dark energy using type Ia supernovae (SNe) as cosmic standardisable candles. The DES supernova programme (DES-SN) detected transient events in 2013 – 2018 by observing ten fields of 3 deg2 each with a weekly cadence for ∼ 5 months a year. As a result ∼ 29000 optical transients were identified by DES-SN. I performed two archival searches to identify rapidly evolving transients (RETs) in DESSN data. In the first one, ∼ 1600 Single-Season Transients (SSTs) that exhibited fast light curve evolution as estimated by Gaussian fits, were inspected resulting in discovery of 92 RETs. The RETs were characterised by short rise times (trise . 10 d) and blue peak colours (g − r . 0.6) distinguishing them from other known transient classes in DES-SN, especially with interpolated Gaussian Process light curves. Thus in the second search, all SSTs with similar rise times and peak colours as the RETs were inspected, once type Ia SNe and transients exhibiting multi-season variability or long decline timescales were excluded. 14 additional RETs were discovered, resulting in the final sample of 106 including 52 with known redshifts. The RETs were found on a range of redshifts (0.05 – 1.56) and peak luminosities (−15.8 & M & −22.6) and they were characterised by light curve evolution with time above half maximum brightness, thalf . 12 d, distinguishing them from standard SNe. Their photometric data was well fitted with a blackbody model, mostly revealing hot (∼ 8000 – 30000 K) and large (∼ 1014 – 1015 cm) photospheres that were cooling and expanding in time. Furthermore, three RETs were found to exhibit receding photospheres. The host galaxy analysis revealed that the RETs appear to occur in star-forming galaxies, indicating an origin in massive stars. However, the nickel decay cannot explain the peak luminosities with the quick rises, but due to the lack of spectroscopic data the powering mechanism could not be identified. Thus the physical nature of RETs remains unknown. I also investigated two peculiar double-peaked DES-SN transients. Their light curves were nearly identical despite 2.5 mag difference in brightness, but no transients with a similar evolution were found in the literature. While the spectra revealed blueshifted calcium absorption in one event, classification could not be secured for either. The events occurred in very different host environments: one near the nucleus of a spiral galaxy and the other at the outskirts of a passive one. While the nearly identical, but highly atypical light curves could imply a similar origin, the differences in the luminosities and host environments might also indicate that they are physically different." @default.
• W3134765457 created "2021-03-15" @default.
• W3134765457 creator A5013049455 @default.
• W3134765457 date "2020-12-01" @default.
• W3134765457 modified "2023-09-27" @default.
• W3134765457 title "Peculiar optical transients in the dark energy survey" @default.
• W3134765457 hasPublicationYear "2020" @default.
• W3134765457 type Work @default.
• W3134765457 sameAs 3134765457 @default.
• W3134765457 citedByCount "0" @default.
• W3134765457 crossrefType "dissertation" @default.
• W3134765457 hasAuthorship W3134765457A5013049455 @default.
• W3134765457 hasConcept C121332964 @default.
• W3134765457 hasConcept C125245961 @default.
• W3134765457 hasConcept C127592171 @default.
• W3134765457 hasConcept C1276947 @default.
• W3134765457 hasConcept C130726490 @default.
• W3134765457 hasConcept C172790937 @default.
• W3134765457 hasConcept C26405456 @default.
• W3134765457 hasConcept C33024259 @default.
• W3134765457 hasConcept C44870925 @default.
• W3134765457 hasConcept C73329638 @default.
• W3134765457 hasConcept C98444146 @default.
• W3134765457 hasConceptScore W3134765457C121332964 @default.
• W3134765457 hasConceptScore W3134765457C125245961 @default.
• W3134765457 hasConceptScore W3134765457C127592171 @default.
• W3134765457 hasConceptScore W3134765457C1276947 @default.
• W3134765457 hasConceptScore W3134765457C130726490 @default.
• W3134765457 hasConceptScore W3134765457C172790937 @default.
• W3134765457 hasConceptScore W3134765457C26405456 @default.
• W3134765457 hasConceptScore W3134765457C33024259 @default.
• W3134765457 hasConceptScore W3134765457C44870925 @default.
• W3134765457 hasConceptScore W3134765457C73329638 @default.
• W3134765457 hasConceptScore W3134765457C98444146 @default.
• W3134765457 hasLocation W31347654571 @default.
• W3134765457 hasOpenAccess W3134765457 @default.
• W3134765457 hasPrimaryLocation W31347654571 @default.
• W3134765457 hasRelatedWork W2053831110 @default.
• W3134765457 hasRelatedWork W2118245940 @default.
• W3134765457 hasRelatedWork W2132484295 @default.
• W3134765457 hasRelatedWork W2135559333 @default.
• W3134765457 hasRelatedWork W2615083219 @default.
• W3134765457 hasRelatedWork W2884151600 @default.
• W3134765457 hasRelatedWork W2968736172 @default.
• W3134765457 hasRelatedWork W2973379098 @default.
• W3134765457 hasRelatedWork W2976949284 @default.
• W3134765457 hasRelatedWork W3004021038 @default.
• W3134765457 hasRelatedWork W3016471564 @default.
• W3134765457 hasRelatedWork W3098359491 @default.
• W3134765457 hasRelatedWork W3099687556 @default.
• W3134765457 hasRelatedWork W3099713143 @default.
• W3134765457 hasRelatedWork W3101339889 @default.
• W3134765457 hasRelatedWork W3103730372 @default.
• W3134765457 hasRelatedWork W3122448514 @default.
• W3134765457 hasRelatedWork W3200023950 @default.
• W3134765457 hasRelatedWork W3133001359 @default.
• W3134765457 isParatext "false" @default.
• W3134765457 isRetracted "false" @default.
• W3134765457 magId "3134765457" @default.
• W3134765457 workType "dissertation" @default.