Yang, Y., Wang, L., Baade, D. et al. (11 more authors) (2018) Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82. Astrophysical Journal , 852 (2). 89. ISSN 0004-637X
Abstract
The very nearby Type Ia supernova 2014J in M82 offers a rare opportunity to study the physics of thermonuclear supernovae at extremely late phases (gsim800 days). Using the Hubble Space Telescope, we obtained 6 epochs of high-precision photometry for SN 2014J from 277 days to 1181 days past the B-band maximum light. The reprocessing of electrons and X-rays emitted by the radioactive decay chain ${}^{57}\mathrm{Co}\to {}^{57}\mathrm{Fe}$ is needed to explain the significant flattening of both the F606W-band and the pseudo-bolometric light curves. The flattening confirms previous predictions that the late-time evolution of type Ia supernova luminosities requires additional energy input from the decay of 57Co. By assuming the F606W-band luminosity scales with the bolometric luminosity at ~500 days after the B-band maximum light, a mass ratio ${}^{57}\mathrm{Ni}{/}^{56}\mathrm{Ni}\sim {0.065}_{-0.004}^{+0.005}$ is required. This mass ratio is roughly ~3 times the solar ratio and favors a progenitor white dwarf with a mass near the Chandrasekhar limit. A similar fit using the constructed pseudo-bolometric luminosity gives a mass ratio ${}^{57}\mathrm{Ni}{/}^{56}\mathrm{Ni}\sim {0.066}_{-0.008}^{+0.009}$. Astrometric tests based on the multi-epoch HST ACS/WFC images reveal no significant circumstellar light echoes in between 0.3 and 100 pc from the supernova.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 American Astronomical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | nuclear reactions; nucleosynthesis; abundances; supernovae; individual (SN 2014J) |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 31 Jan 2018 14:47 |
Last Modified: | 10 Jan 2019 01:38 |
Published Version: | https://doi.org/10.3847/1538-4357/aa9e4c |
Status: | Published |
Publisher: | IOP Publishing |
Refereed: | Yes |
Identification Number: | 10.3847/1538-4357/aa9e4c |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:126867 |