The Redshift of GRB 190829A/ SN 2019oyw: A Case Study of GRB-SN Evolution
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2024
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| author | Bhirombhakdi, Kornpob Fruchter, Andrew S. Levan, Andrew J. Pian, Elena Mazzali, Paolo Izzo, Luca Kangas, Tuomas Benetti, Stefano Medler, Kyle Tanvir, Nial |
| author_facet | Bhirombhakdi, Kornpob Fruchter, Andrew S. Levan, Andrew J. Pian, Elena Mazzali, Paolo Izzo, Luca Kangas, Tuomas Benetti, Stefano Medler, Kyle Tanvir, Nial |
| contents | The nearby long gamma-ray burst (GRB) 190829A was observed using the HST/WFC3/IR grisms about four weeks to 500 days after the burst. We find the spectral features of its associated supernova, SN 2019oyw, are redshifted by several thousands km/s compared to the redshift of the large spiral galaxy on which it is superposed. This velocity offset is seen in several features but most clearly in Ca II NIR triplet $λλ$ 8498, 8542, 8662 (CaIR3). We also analyze VLT/FORS and X-shooter spectra of the SN and find strong evolution with time of its P-Cygni features of CaIR3 from the blue to the red. However, comparison with a large sample of Type Ic-BL and Ic SNe shows no other object with the CaIR3 line as red as that of SN 2019oyw were it at the z = 0.0785 redshift of the disk galaxy. This implies that SN 2019oyw is either a highly unusual SN or is moving rapidly with respect to its apparent host. Indeed, using CaIR3 we find the redshift of SN 2019oyw is 0.0944 <= z <= 0.1156. The GRB-SN is superposed on a particularly dusty region of the massive spiral galaxy; therefore, while we see no sign of a small host galaxy behind the spiral, it could be obscured. Our work provides a surprising result on the origins of GRB 190829A, as well as insights into the time evolution of GRB-SNe spectra and a method for directly determining the redshift of a GRB-SN using the evolution of strong spectral features such as CaIR3. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_09372 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Redshift of GRB 190829A/ SN 2019oyw: A Case Study of GRB-SN Evolution Bhirombhakdi, Kornpob Fruchter, Andrew S. Levan, Andrew J. Pian, Elena Mazzali, Paolo Izzo, Luca Kangas, Tuomas Benetti, Stefano Medler, Kyle Tanvir, Nial High Energy Astrophysical Phenomena The nearby long gamma-ray burst (GRB) 190829A was observed using the HST/WFC3/IR grisms about four weeks to 500 days after the burst. We find the spectral features of its associated supernova, SN 2019oyw, are redshifted by several thousands km/s compared to the redshift of the large spiral galaxy on which it is superposed. This velocity offset is seen in several features but most clearly in Ca II NIR triplet $λλ$ 8498, 8542, 8662 (CaIR3). We also analyze VLT/FORS and X-shooter spectra of the SN and find strong evolution with time of its P-Cygni features of CaIR3 from the blue to the red. However, comparison with a large sample of Type Ic-BL and Ic SNe shows no other object with the CaIR3 line as red as that of SN 2019oyw were it at the z = 0.0785 redshift of the disk galaxy. This implies that SN 2019oyw is either a highly unusual SN or is moving rapidly with respect to its apparent host. Indeed, using CaIR3 we find the redshift of SN 2019oyw is 0.0944 <= z <= 0.1156. The GRB-SN is superposed on a particularly dusty region of the massive spiral galaxy; therefore, while we see no sign of a small host galaxy behind the spiral, it could be obscured. Our work provides a surprising result on the origins of GRB 190829A, as well as insights into the time evolution of GRB-SNe spectra and a method for directly determining the redshift of a GRB-SN using the evolution of strong spectral features such as CaIR3. |
| title | The Redshift of GRB 190829A/ SN 2019oyw: A Case Study of GRB-SN Evolution |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.09372 |