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1.	Jacobson-Galan, Wynn, et al. (author) SN 2019ehk: A Double-Peaked Ca-rich Transient with Luminous X-ray Emission and Shock-Ionized Spectral Features 2020 In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 898:2 Journal article (peer-reviewed)
2.	Nicholl, Matt, et al. (author) An extremely energetic supernova from a very massive star in a dense medium 2020 In: Nature Astronomy. - : Springer Science and Business Media LLC. - 2397-3366. ; 4, s. 893-899 Journal article (peer-reviewed)abstract The interaction of a supernova with a circumstellar medium (CSM) can dramatically increase the emitted luminosity by converting kinetic energy to thermal energy. In 'superluminous' supernovae of type IIn-named for narrow hydrogen lines(1) in their spectra-the integrated emission can reach(2-6) similar to 10(51) erg, attainable by thermalizing most of the kinetic energy of a conventional supernova. A few transients in the centres of active galaxies have shown similar spectra and even larger energies(7,8), but are difficult to distinguish from accretion onto the supermassive black hole. Here we present a new event, SN2016aps, offset from the centre of a low-mass galaxy, that radiated greater than or similar to 5 x 10(51) erg, necessitating a hyper-energetic supernova explosion. We find a total (supernova ejecta + CSM) mass likely exceeding 50-100 M-circle dot, with energy greater than or similar to 10(52) erg, consistent with some models of pair-instability supernovae or pulsational pair-instability supernovae-theoretically predicted thermonuclear explosions from helium cores >50 M-circle dot. Independent of the explosion mechanism, this event demonstrates the existence of extremely energetic stellar explosions, detectable at very high redshifts, and provides insight into dense CSM formation in the most massive stars.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Nicholl, Matt (2); Gomez, Sebastian (2); Berger, Edo (2); Margutti, Raffaella (2); Terreran, Giacomo (2); Galbany, Lluís (1); show more...; Gromadzki, Mariusz (1); Rest, Armin (1); Fremling, Christoffe ... (1); Laher, Russ R. (1); Bieryla, Allyson (1); Vigna-Gómez, Alejand ... (1); Masci, Frank J. (1); Blanchard, Peter K. (1); Cartier, Regis (1); Chornock, Ryan (1); Hajela, Aprajita (1); Wang, Xiaofeng (1); Brown, Peter (1); Kasen, Daniel (1); Hosseinzadeh, Griffi ... (1); McCully, Curtis (1); Lunnan, Ragnhild (1); Dimitriadis, Georgio ... (1); Rojas-Bravo, Cesar (1); Burke, Jamison (1); Pellegrino, Craig (1); Dobson, Matthew (1); Stacey, Holland (1); Rahman, Mohammed (1); Andrews, Jennifer (1); Milisavljevic, Danny (1); Miller, Adam A. (1); Bobrick, Alexey (1); Zenati, Yossef (1); Perets, Hagai (1); Anderson, Joseph (1); Fong, Wen-fai (1); Foley, Ryan (1); Kuncarayakti, Hanind ... (1); Paterson, Kerry (1); Blanchard, Peter (1); Sai, Hanna (1); Zhang, Xinhan (1); Sand, David (1); Smartt, Stephen (1); Jacobson-Galan, Wynn (1); Kilpatrick, Charles (1); Hiramitsu, Daichi (1); Khatami, David (1); show less...

University: Stockholm University (1); Lund University (1)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2020 (2)Undo refine

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