2020MNRAS.491.1384M -
Mon. Not. R. Astron. Soc., 491, 1384-1390 (2020/January-1)
iPTF14hls as a variable hyper-wind from a very massive star.
MORIYA T.J., MAZZALI P.A. and PIAN E.
Abstract (from CDS):
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.
Abstract Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
stars: massive - stars: mass-loss - stars: winds - outflows
Simbad objects:
4
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