Extensive Spectroscopy and Photometry of the Type IIP Supernova 2013ej
We present extensive optical (UBV RI, {g}<SUP>\prime </SUP>{r}<SUP>\prime </SUP>{i}<SUP>\prime </SUP>{z}<SUP>\prime </SUP>, and open CCD) and near-infrared (ZY JH) photometry for the very nearby Type IIP SN 2013ej extending from +1 to +461 days aft...
Elmentve itt :
| Szerzők: | |
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2016
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| Sorozat: | ASTROPHYSICAL JOURNAL
822 |
| doi: | 10.3847/0004-637X/822/1/6 |
| mtmt: | 3076686 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/7613 |
| Tartalmi kivonat: | We present extensive optical (UBV RI, {g}<SUP>\prime </SUP>{r}<SUP>\prime </SUP>{i}<SUP>\prime </SUP>{z}<SUP>\prime </SUP>, and open CCD) and near-infrared (ZY JH) photometry for the very nearby Type IIP SN 2013ej extending from +1 to +461 days after shock breakout, estimated to be MJD 56496.9 ± 0.3. Substantial time series ultraviolet and optical spectroscopy obtained from +8 to +135 days are also presented. Considering well-observed SNe IIP from the literature, we derive UBV RIJHK bolometric calibrations from UBV RI and unfiltered measurements that potentially reach 2% precision with a B ‑ V color-dependent correction. We observe moderately strong Si ii λ 6355 as early as +8 days. The photospheric velocity ({v}<SUB>{{ph</SUB>}}) is determined by modeling the spectra in the vicinity of Fe ii λ 5169 whenever observed, and interpolating at photometric epochs based on a semianalytic method. This gives {v}<SUB>{{ph</SUB>}}=4500+/- 500 km s<SUP>‑1</SUP> at +50 days. We also observe spectral homogeneity of ultraviolet spectra at +10–12 days for SNe IIP, while variations are evident a week after explosion. Using the expanding photosphere method, from combined analysis of SN 2013ej and SN 2002ap, we estimate the distance to the host galaxy to be {9.0}<SUB>-0.6</SUB><SUP>+0.4</SUP> Mpc, consistent with distance estimates from other methods. Photometric and spectroscopic analysis during the plateau phase, which we estimated to be 94 ± 7 days long, yields an explosion energy of 0.9+/- 0.3× {10}<SUP>51</SUP> erg, a final pre-explosion progenitor mass of 15.2 ± 4.2 {M}<SUB>ȯ </SUB> and a radius of 250 ± 70 {R}<SUB>ȯ </SUB>. We observe a broken exponential profile beyond +120 days, with a break point at +183 ± 16 days. Measurements beyond this break time yield a <SUP>56</SUP>Ni mass of 0.013 ± 0.001 M {}<SUB>ȯ </SUB>. |
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| Terjedelem/Fizikai jellemzők: | Terjedelem: 29 p-Azonosító: 6 |
| ISSN: | 0004-637X |