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Transparent Helium in Stripped Envelope Supernovae

Piro, Anthony L. and Morozova, Viktoriya S. (2014) Transparent Helium in Stripped Envelope Supernovae. Astrophysical Journal Letters, 792 (1). Art. No. L11. ISSN 2041-8205.

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Using simple arguments based on photometric light curves and velocity evolution, we propose that some stripped envelope supernovae (SNe) show signs that a significant fraction of their helium is effectively transparent. The main pieces of evidence are the relatively low velocities with little velocity evolution, as are expected deep inside an exploding star, along with temperatures that are too low to ionize helium. This means that the helium should not contribute to the shaping of the main SN light curve, and thus the total helium mass may be difficult to measure from simple light curve modeling. Conversely, such modeling may be more useful for constraining the mass of the carbon/oxygen core of the SN progenitor. Other stripped envelope SNe show higher velocities and larger velocity gradients, which require an additional opacity source (perhaps the mixing of heavier elements or radioactive nickel) to prevent the helium from being transparent. We discuss ways in which similar analysis can provide insights into the differences and similarities between SNe Ib and Ic, which will lead to a better understanding of their respective formation mechanisms.

Item Type:Article
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URLURL TypeDescription Paper
Piro, Anthony L.0000-0001-6806-0673
Additional Information:© 2014 American Astronomical Society. Received 2014 July 22; accepted 2014 August 2; published 2014 August 14. We thank Drew Clausen for generating the 15M_⊙ model used for Figure 1, Mattias Ergon for helpful discussions, and Dan Kasen and Christian Ott for feedback on previous drafts. We also thank the Carnegie Supernova Project, and in particular Mark Phillips, for generously hosting ALP at the CSP II Team Meeting at St. George Island, Florida where this work was inspired. This work was supported through NSF grants AST-1205732, PHY-1068881, PHY-1151197, PHY-1404569, and the Sherman Fairchild Foundation.
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Sherman Fairchild FoundationUNSPECIFIED
Subject Keywords: hydrodynamics; shock waves; supernovae: general
Issue or Number:1
Record Number:CaltechAUTHORS:20140804-081610076
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Official Citation: Transparent Helium in Stripped Envelope Supernovae Anthony L. Piro and Viktoriya S. Morozova 2014 ApJ 792 L11
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47866
Deposited By: Ruth Sustaita
Deposited On:04 Aug 2014 17:20
Last Modified:03 Oct 2019 06:57

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