Bridging the Gap

Bridging the Gap

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For centuries, we have known that our dynamic universe is adorned by cosmic fireworks: energetic and ephemeral beacons of light from a single star that are a million (nova) to a billion (supernova) times brighter than our sun. However, it had been an age-old conundrum that the brightest nova is approximately 1000 times fainter than the faintest supernova; why should nature leave such a wide qgapq? In search of an answer, I undertook three systematic surveys for my thesis. Since I was looking for transients fainter, faster and rarer than supernovae, I focused my search on galaxies in the local universe. We now have convincing evidence of multiple, distinct populations of rare transients bridging this qgap.q Perhaps, we are witnessing new stellar physics- shell detonations in ultra-compact white dwarf binaries, electron-capture supernovae, white dwarfs collapsing into neutron stars and birth of black-holes. A small number of intensively followed-up discoveries of elusive transients sets the stage for population studies with the upcoming qLarge Synoptic Survey Telescope.q This effort works towards building a complete inventory of transients in the local universe (dQuery databases to check if there is a known asteroid, star or galaxy at that position (Minor Planet Center, Simbad, SDSS). 6. Visualisation and Manual Vetting. Post thumbnails of filtered candidates on a webpage for manual scanning.

Title:Bridging the Gap
Author: Mansi M. Kasliwal
Publisher:Universal-Publishers - 2012-01

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