Details

Autor(en) / Beteiligte

• Yang, Yi
• Wang, Lifan
• Baade, Dietrich
• Brown, Peter. J.
• Cikota, Aleksandar
• Cracraft, Misty
• Höflich, Peter A.
• Maund, Justyn R.
• Patat, Ferdinando
• Sparks, William B.
• Spyromilio, Jason
• Stevance, Heloise F.
• Wang, Xiaofeng
• Wheeler, J. Craig

Titel

Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82

Ist Teil von

• The Astrophysical journal, 2018-01, Vol.852 (2), p.89

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2018

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• The very nearby Type Ia supernova 2014J in M82 offers a rare opportunity to study the physics of thermonuclear supernovae at extremely late phases ( 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 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 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 . 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.