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Gall, C, Hjorth, J, Christensen, L, Izzo, L, Mazzali, PA, Phillips, MM, Hoeflich, P, Angus, C, Cold, C and Selsing, J (2024) Origin of the Strong Sodium Absorption of the Lensed Supernova 2016geu at z = 0.4. Astrophysical Journal, 972 (1). ISSN 0004-637X
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Origin of the Strong Sodium Absorption of the Lensed Supernova 2016geu at z = 0.4.pdf - Published Version Available under License Creative Commons Attribution. Download (962kB) | Preview |
Abstract
The origin of strong sodium absorption, which has been observed for a few nearby Type Ia supernovae (SNe Ia), remains elusive. Here we analyze two high-signal-to-noise, intermediate-resolution Very Large Telescope/X-shooter spectra at epochs +18 and +27 days past peak brightness of the strongly lensed and multiply imaged Type Ia SN 2016geu, which exploded at a redshift of z = 0.4. We show that SN 2016geu exhibits very strong multiple Na i and Ca ii absorption lines with a large total Na i D rest-frame equivalent width (EW) of 5.2 ± 0.2 Å, among the highest ever detected for an SN Ia and similar to only a handful of nearby SNe Ia with extraordinarily large Na i D EWs. The absorption system is time-invariant and extends over a large velocity span ∼250 km s−1. The majority of the absorption is blueshifted relative to the strongest component, while there are both blueshifted and redshifted components relative to the systemic redshift of the galaxy. The column density ratios and widths of the absorption lines indicate that the absorption likely arises from a combination of interstellar dusty molecular clouds and circumgalactic in- and outflowing material rather than circumstellar matter around the supernova.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 25 Sep 2024 15:30 |
| Last Modified: | 25 Sep 2024 15:30 |
| DOI or ID number: | 10.3847/1538-4357/ad5a12 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24274 |
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