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Late-time Flattening Of Type Ia Supernova Light Curves

Title: Late-time Flattening Of Type Ia Supernova Light Curves: Constraints From.
Name(s): Yang, Yi, author
Wang, Lifan, author
Baade, Dietrich, author
Brown, Peter J., author
Cikota, Aleksandar, author
Cracraft, Misty, author
Hoflich, Peter A., author
Maund, Justyn R., author
Patat, Ferdinando, author
Sparks, William B., author
Spyromilio, Jason, author
Stevance, Heloise F., author
Wang, Xiaofeng, author
Wheeler, J. Craig, author
Type of Resource: text
Genre: Journal Article
Journal Article
Date Issued: 2018-01-10
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The very nearby Type Ia supernova 2014J in M82 offers a rare opportunity to study the physics of thermonuclear supernovae at extremely late phases (greater than or similar to 800 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 Co-57 -> Fe-57 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 Co-57. By assuming the F606W-band luminosity scales with the bolometric luminosity at similar to 500 days after the B-band maximum light, a mass ratio Ni-57/Ni-56 similar to 0.065(-0.005)(+0.004) is required. This mass ratio is roughly similar to 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 Ni-57/Ni-56 similar to 0.066(-0.009)(+0.008) . 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.
Identifier: FSU_libsubv1_wos_000419798700006 (IID), 10.3847/1538-4357/aa9e4c (DOI)
Keywords: emission, nuclear reactions, nucleosynthesis, abundances, models, extinction, decay, dust, nucleosynthesis, 2011fe, ni-56, novae, supernovae: individual (SN 2014J), universe
Publication Note: The publisher's version of record is available at
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Astrophysical Journal.
Issue: iss. 2, vol. 852

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Yang, Y., Wang, L., Baade, D., Brown, P. J., Cikota, A., Cracraft, M., … Wheeler, J. C. (2018). Late-time Flattening Of Type Ia Supernova Light Curves: Constraints From. Astrophysical Journal. Retrieved from