应该是确认了Iax超新星是部分爆炸的白矮星了

应该是确认了Iax超新星是部分爆炸的白矮星了?

嗯... 没有新闻中说的那么夸张

文章信息:

Still Brighter than Pre-explosion, SN 2012Z Did Not Disappear: Comparing Hubble Space Telescope Observations a Decade Apart

McCully, Curtis search by orcid ; Jha, Saurabh W. search by orcid ; Scalzo, Richard A. ; Howell, D. Andrew search by orcid ; Foley, Ryan J. search by orcid ; Zeng, Yaotian search by orcid ; Liu, Zheng-Wei search by orcid ; Hosseinzadeh, Griffin search by orcid ; Bildsten, Lars search by orcid ; Riess, Adam G. search by orcid ; Kirshner, Robert P. search by orcid ; Marion, G. H. ; Camacho-Neves, Yssavo

Abstract

Type Iax supernovae (SNe Iax) represent the largest class of peculiar white dwarf supernovae. The type Iax SN 2012Z in NGC 1309 is the only white dwarf supernova with a detected progenitor system in pre-explosion observations. Deep Hubble Space Telescope (HST) images taken before SN 2012Z show a luminous, blue source that we have interpreted as a helium-star companion (donor) to the exploding white dwarf. We present here late-time HST observations taken ~1400 days after the explosion to test this model. We find the SN light curve can empirically be fit by an exponential-decay model in magnitude units. The fitted asymptotic brightness is within 10% of our latest measurements and approximately twice the brightness of the pre-explosion source. The decline of the light curve is too slow to be powered by 56Co or 57Co decay: if radioactive decay is the dominate power source, it must be from longer half-life species like 55Fe. Interaction with circumstellar material may contribute to the light curve, as may shock heating of the companion star. Companion-star models underpredict the observed flux in the optical, producing most of their flux in the UV at these epochs. A radioactively heated bound remnant, left after only a partial disruption of the white dwarf, is also capable of producing the observed excess late-time flux. Our analysis suggests that the total ejecta + remnant mass is consistent with the Chandrasekhar mass for a range of SNe Iax.

Publication:

The Astrophysical Journal, Volume 925, Issue 2, id.138, 16 pp.

Pub Date: February 2022 DOI: 10.3847/1538-4357/ac3bbd arXiv: arXiv:2106.04602 Bibcode: Keywords:

1668; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Solar and Stellar Astrophysics

E-Print Comments: 20 pages, 13 figures, accepted to ApJ; doi:10.3847/1538-4357/ac3bbd