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16. A hot and fast ultra-stripped supernova that likely formed a compact neutron star binaryTanja Petrushevska, 2018, original scientific article Abstract: Compact neutron star binary systems are produced from binary massive stars through stellar evolution involving up to two supernova explosions. The final stages in the formation of these systems have not been directly observed. We report the discovery of iPTF 14gqr (SN 2014ft), a type Ic supernova with a fast-evolving light curve indicating an extremely low ejecta mass (≈0.2 solar masses) and low kinetic energy (≈2 × 1050 ergs). Early photometry and spectroscopy reveal evidence of shock cooling of an extended helium-rich envelope, likely ejected in an intense pre-explosion mass-loss episode of the progenitor. Taken together, we interpret iPTF 14gqr as evidence for ultra-stripped supernovae that form neutron stars in compact binary systems.
Keywords: supernova, neutron stars, gravitational waves
Published in RUNG: 12.10.2018; Views: 3483; Downloads: 0
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18. Supernova remnants in the very-high-energy sky: prospects for the Cherenkov Telescope ArrayP. Cristofari, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: supernova remnants, CTA, very-high-energy
Published in RUNG: 16.02.2018; Views: 3471; Downloads: 179
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19. PASSERBY BECOME SUPERNOVA HUNTERS IN KUNGSTRÄDGÅRDENTanja Petrushevska, S. Papadogiannakis, Emir Karamehmetoglu, 2015, other performed works Abstract: Fysik i Kungsträdgården is one of the major outreach events in Stockholm where scientists have the chance to show their research. This year the supernova group at the OKC invited the public to look for supernovae with us using the intermediate Palomar (Transient) Factory (iPTF) collaboration telescope in Palomar, California, U.S.A. Due to the time difference between Stockholm and California, we were able to look at live images as they were taken from the telescope, to search for new transient objects such as supernovae. The event was successful, bringing a lot of people from the park in central Stockholm to come and search with us.
Keywords: science outreach, supernova hunting for the public
Published in RUNG: 09.02.2018; Views: 3876; Downloads: 0
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