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  iPTF14hls as a variable hyper-wind from a very massive star

Moriya, T. J., Mazzali, P. A., & Pian, E. (2019). iPTF14hls as a variable hyper-wind from a very massive star. Monthly Notices of the Royal Astronomical Society, 491(1), 1384-1390. doi:10.1093/mnras/stz3122.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C433-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C434-3
Genre: Journal Article

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Moriya, Takashi J., Author
Mazzali, Paolo A.1, Author              
Pian, Elena, Author
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: The origin of iPTF14hls, which had Type IIP supernova-like spectra but kept bright for almost two years with little spectral evolution, is still unclear. We here propose that iPTF14hls was not a sudden outburst like supernovae but rather a long-term outflow similar to stellar winds. The properties of iPTF14hls, which are at odds with a supernova scenario, become natural when interpreted as a stellar wind with variable mass-loss rate. Based on the wind hypothesis, we estimate the mass-loss rates of iPTF14hls in the bright phase. We find that the instantaneous mass-loss rate of iPTF14hls during the 2-yr bright phase was more than a few M yr−1 (‘hyper-wind’) and it reached as much as 10 M yr−1 . The total mass lost over two years was about 10 M. Interestingly, we find that the light curve of iPTF14hls has a very similar shape to that of η Carinae during the Great Eruption, which also experienced a similar but less extreme brightening accompanied by extraordinary mass-loss, shedding more than 10 M in 10 yr. The progenitor of iPTF14hls is less than 150 M if it still exists, which is similar to η Carinae. The two phenomena may be related to a continuum-driven extreme wind from very massive stars.

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 Dates: 2019-11-07
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz3122
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 491 (1) Sequence Number: - Start / End Page: 1384 - 1390 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470