Highly reddened type Ia supernova SN 2004ab: another case of anomalous extinction
| Autor: | Tushar P. Prabhu, D. K. Sahu, G. C. Anupama, N. K. Chakradhari |
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| Rok vydání: | 2017 |
| Předmět: |
Absolute magnitude
Physics High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics Extinction (astronomy) FOS: Physical sciences Astronomy and Astrophysics Astrophysics Type (model theory) 01 natural sciences Galaxy Luminosity Supernova Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science 0103 physical sciences Absorption (logic) Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Line (formation) |
| DOI: | 10.48550/arxiv.1711.00628 |
| Popis: | We present optical photometric and spectroscopic results of supernova SN 2004ab, a highly reddened normal type Ia supernova. The total reddening is estimated as $E(B-V)$ = 1.70 $\pm$ 0.05 mag. The intrinsic decline rate parameter, $\Delta m_{15}(B)_\text{true}$ is 1.27 $\pm$ 0.05, and $B$-band absolute magnitude at maximum $M_{B}^{\text{max}}$ is $-$19.31 $\pm$ 0.25 mag. The host galaxy NGC 5054 is found to exhibit anomalous extinction with very low value of $R_V$ = 1.41 $\pm$ 0.06 in the direction of SN 2004ab. Peak bolometric luminosity is derived as $\log L_\text{bol}^\text{max}$ = 43.10 $\pm$ 0.07 erg\,s$^{-1}$. The photospheric velocity measured from absorption minimum of Si\,{\sc ii} $\lambda$6355 line shows a velocity gradient of $\dot{v}$ = 90 km\,s$^{-1}$\,d$^{-1}$, indicating that SN 2004ab is a member of the high velocity gradient (HVG) subgroup. The ratio of strength of Si\,{\sc ii} $\lambda$5972 and $\lambda$6355 absorption lines, $\cal R$(Si\,{\sc ii}) is estimated as 0.37, while their pseudo equivalent widths suggest that SN 2004ab belongs to broad line (BL) type subgroup. Comment: 13 pages, 5 tables, 16 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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