Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82
Yang, Yi1,2; Wang, Lifan1,3; Baade, Dietrich4; Brown, Peter. J.1; Cikota, Aleksandar4; Cracraft, Misty5; Hoflich, Peter A.6; Maund, Justyn R.7; Patat, Ferdinando4; Sparks, William B.5; Spyromilio, Jason4; Stevance, Heloise F.7; Wang, Xiaofeng8,9; Wheeler, J. Craig10,11

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.

Keywordnuclear reactions, nucleosynthesis, abundances supernovae: individual (SN 2014J)
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000419798700006
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Document Type期刊论文
Corresponding AuthorYang, Yi
Affiliation1.Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, Dept Phys & Astron, 4242 TAMU, College Stn, TX 77843 USA
2.Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.European Org Astron Res Southern Hemisphere ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany
5.Space Telescope Sci Inst, Baltimore, MD 21218 USA
6.Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA
7.Univ Sheffield, Dept Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England
8.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China
9.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China
10.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
11.Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA
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Yang, Yi,Wang, Lifan,Baade, Dietrich,et al. Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82[J]. ASTROPHYSICAL JOURNAL,2018,852(2):10.
APA Yang, Yi.,Wang, Lifan.,Baade, Dietrich.,Brown, Peter. J..,Cikota, Aleksandar.,...&Wheeler, J. Craig.(2018).Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82.ASTROPHYSICAL JOURNAL,852(2),10.
MLA Yang, Yi,et al."Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82".ASTROPHYSICAL JOURNAL 852.2(2018):10.
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