| Autor: |
Holmbo, S., Stritzinger, M. D., Shappee, B. J., Tucker, M. A., Zheng, W., Ashall, C., Phillips, M. M., Contreras, C., Filippenko, A. V., Hoeflich, P., Huber, M., Wang, X. F., Zhang, J. -J., Anais, J., Baron, E., Burns, C. R., Campillay, A., Castellon, S., Corco, C., Hsiao, E. Y., Krisciunas, K., Morrell, N., Nielsen, M. T. B., Persson, S. E., Piro, A., Taddia, F., Tomasella, L., Zhang, T. -M., Zhao, X. -L. |
| Rok vydání: |
2018 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| DOI: |
10.1051/0004-6361/201834389 |
| Popis: |
We present an early-phase $g$-band light curve and visual-wavelength spectra of the normal Type Ia supernova (SN) 2013gy. The light curve is constructed by determining the appropriate S-corrections to transform KAIT natural-system $B$- and $V$-band photometry and Carnegie Supernova Project natural-system $g$-band photometry to the Pan-STARRS1 $g$-band natural photometric system. A Markov Chain Monte Carlo calculation provides a best-fit single power-law function to the first ten epochs of photometry described by an exponent of $2.16^{+0.06}_{-0.06}$ and a time of first light of MJD 56629.4$^{+0.1}_{-0.1}$, which is $1.93^{+0.12}_{-0.13}$ days (i.e., $<48$~hr) before the discovery date (2013 December 4.84 UT) and $-19.10^{+0.12}_{-0.13}$ days before the time of $B$-band maximum (MJD 56648.5$\pm0.1$). The estimate of the time of first light is consistent with the explosion time inferred from the evolution of the Si II $\lambda$6355 Doppler velocity. Furthermore, discovery photometry and previous nondetection limits enable us to constrain the companion radius down to $R_c \leq 4\,R_{\odot}$. In addition to our early-time constraints, we use a deep +235 day nebular-phase spectrum from Magellan/IMACS to place a stripped H-mass limit of $< 0.018\,M_{\odot}$. Combined, these limits effectively rule out H-rich nondegenerate companions. |
| Databáze: |
arXiv |
| Externí odkaz: |
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