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19 April 2024 |
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SN 2000cx and SN 2013bh: Extremely Rare, Nearly Twin Type Ia Supernovae | | Jeffrey M. Silverman
; Jozsef Vinko
; Mansi M. Kasliwal
; Ori D. Fox
; Yi Cao
; Joel Johansson
; Daniel A. Perley
; David Tal
; J. Craig Wheeler
; Rahman Amanullah
; Iair Arcavi
; Joshua S. Bloom
; Avishay Gal-Yam
; Ariel Goobar
; Shrinivas R. Kulkarni
; Russ Laher
; William H. Lee
; G. H. Marion
; Peter E. Nugent
; Isaac Shivvers
; | | Date: |
12 Jul 2013 | | Abstract: | The Type Ia supernova (SN Ia) SN 2000cx was one of the most peculiar
transients ever discovered. While its rise to maximum brightness was typical
for a SN Ia, its decline was slower, causing standard light curve fitting
algorithms to fail; its spectra indicated a high photospheric temperature.
Thirteen years later SN 2013bh (aka iPTF13abc), the first near identical twin
of SN 2000cx, was discovered. We obtained optical and near-IR photometry and
low-resolution optical spectroscopy of this object from discovery until about 1
month past r-band maximum brightness. The spectra of both objects indicate the
presence of iron-group elements (Co II, Ni II, Fe II, Fe III, and high-velocity
features [HVFs] of Ti II), intermediate-mass elements (Si II, Si III, and S
II), in addition to separate normal velocity features (~12000 km/s) and HVFs
(~24000 km/s) of Ca II. Persistent absorption from Fe III and Si III, along
with the colour evolution, imply relatively high blackbody temperatures for SNe
2013bh and 2000cx (~12000 K). Both objects lack narrow Na I D absorption and
exploded in the outskirts of their host galaxies, indicating that the SN
environment was relatively free of interstellar or circumstellar material. This
hints that the progenitors of these objects likely came from a relatively old
and low-metallicity stellar population and possibly from the merger of two
degenerate objects. Models of SN 2000cx, which seem to be directly applicable
to SN 2013bh, imply the production of up to ~1 M_Sun of Ni-56 and, in order to
explain the HVFs of Ca II, (4.3-5.5)e-3 M_Sun of fast-moving Ca ejecta (which
can be explained by primordial material alone). | | Source: | arXiv, 1307.3555 | | Services: | Forum | Review | PDF | Favorites | |
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