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

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-year bright phase was more than a few Msun/yr ("hyper-wind") and it reached as much as 10 Msun/yr. The total mass lost over two years was about 10 Msun. Interestingly, we find that the light curve of iPTF14hls has a very similar shape to that of eta Carinae during the Great Eruption, which also experienced a similar but less extreme brightening accompanied by extraordinary mass loss, shedding more than 10 Msun in 10 years. The progenitor of iPTF14hls is less than 150 Msun if it still exists, which is similar to eta Carinae. The two phenomena may be related to a continuum-driven extreme wind from very massive stars.

arXiv comment8 pages, 7 figures, accepted by Monthly Notices of the Royal Astronomical Society

References in corpus (29)

• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• Pulsational pair instability as an explanation for the most luminous supernovae
• On the role of continuum-driven eruptions in the evolution of very massive stars and Population III stars
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• Grids of stellar models with rotation - III. Models from 0.8 to 120 Msun at a metallicity Z = 0.002
• Type II Supernovae: Model Light Curves and Standard Candle Relationships
• The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method
• Photometry and Spectroscopy of the Type IIP SN 1999em from Outburst to Dust Formation
• The Distance to SN 1999em from the Expanding Photosphere Method
• The Structure of the Homunculus: I. Shape and Latitude Dependence from H2 and [Fe II] Velocity Maps of Eta Carinae
• Evolution of massive stars with pulsation-driven superwinds during the RSG phase
• Evolution of massive population III stars with rotation and magnetic fields
• Hydrodynamical models of Type II-Plateau Supernovae
• Photometric and Spectroscopic Properties of Type II-P Supernovae
• Low-metallicity massive single stars with rotation. Evolutionary models applicable to I Zwicky 18
• Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star
• Strong late-time circumstellar interaction in the peculiar supernova iPTF14hls
• Light echoes reveal an unexpectedly cool Eta Carinae during its 19th-century Great Eruption
• Exact and approximate expressions of energy generation rates and their impact on the explosion properties of Pair Instability Supernovae
• Explaining iPTF14hls as a common envelope jets supernova
• Properties of Two Hypernovae Entering the Nebular Phase: SN 1997ef and SN 1997dq
• A Model for the 19th Century Eruption of Eta Carinae: CSM Interaction Like a Scaled-Down Type IIn Supernova
• Was the nineteenth century giant eruption of Eta Carinae a merger event in a triple system?
• Numerical simulations of continuum-driven winds of super-Eddington stars
• Exceptionally fast ejecta seen in light echoes of Eta Carinae's Great Eruption
• Long-Term Optical Monitoring of Eta Carinae. Multiband light curves for a complete orbital period
• The Spectral Temperature of Optically Thick Outflows with Application to Light Echo Spectra from $\eta$~Carinae's Giant Eruption
• The strongly interacting binary scenarios of the enigmatic supernova iPTF14hls
• Chromospheres and Winds of Red Supergiants: An Empirical Look at Outer Atmospheric Structure

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