The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution
The nearby long gamma-ray burst (GRB) 190829A was observed using the Hubble Space Telescope/Wide Field Camera 3/infrared 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 thousand km s ^−1 compared to...
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2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad8dd8 |
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| author | Kornpob Bhirombhakdi Andrew S. Fruchter Andrew J. Levan Elena Pian Paolo Mazzali Luca Izzo Tuomas Kangas Stefano Benetti Kyle Medler Nial Tanvir |
| author_facet | Kornpob Bhirombhakdi Andrew S. Fruchter Andrew J. Levan Elena Pian Paolo Mazzali Luca Izzo Tuomas Kangas Stefano Benetti Kyle Medler Nial Tanvir |
| author_sort | Kornpob Bhirombhakdi |
| collection | DOAJ |
| description | The nearby long gamma-ray burst (GRB) 190829A was observed using the Hubble Space Telescope/Wide Field Camera 3/infrared 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 thousand km s ^−1 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 near-infrared triplet λλ 8498, 8542, 8662 (CaIR3). We also analyze Very Large Telescope/FOcal Reducer and low dispersion Spectrograph and X-shooter spectra of the supernova (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 | Article |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-93692d6bf46b4990a82bbe0db612bc7e2024-12-18T17:51:25ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01977225610.3847/1538-4357/ad8dd8The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN EvolutionKornpob Bhirombhakdi0https://orcid.org/0000-0003-0136-1281Andrew S. Fruchter1https://orcid.org/0000-0002-6652-9279Andrew J. Levan2https://orcid.org/0000-0001-7821-9369Elena Pian3https://orcid.org/0000-0001-8646-4858Paolo Mazzali4https://orcid.org/0000-0001-6876-8284Luca Izzo5https://orcid.org/0000-0001-9695-8472Tuomas Kangas6https://orcid.org/0000-0002-5477-0217Stefano Benetti7https://orcid.org/0000-0002-3256-0016Kyle Medler8https://orcid.org/0000-0001-7186-105XNial Tanvir9https://orcid.org/0000-0003-3274-6336Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; bkornpob@gmail.comSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; bkornpob@gmail.comDepartment of Astrophysics/IMAPP, Radboud University Nijmegen , P.O. Box 9010, 6500 GL Nijmegen, The Netherlands; Department of Physics, University of Warwick , Coventry, CV4 7AL, UKINAF, Astrophysics and Space Science Observatory , Via P. Gobetti 101, 40129 Bologna, ItalyAstrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UK; Max-Planck Institut für Astrophysik , Karl-Schwarzschild-Straße 1, D-85748 Garching, GermanyDARK, Niels Bohr Institute, University of Copenhagen , Copenhagen N, Denmark; INAF—Osservatorio Astronomico di Capodimonte , Naples, ItalyFinnish Centre for Astronomy with ESO (FINCA), University of Turku , FI-20014, Finland; Department of Physics and Astronomy, University of Turku , Vesilinnantie 5, FI-20500, FinlandINAF—Osservatorio Astronomico di Padova , vicolo dell’Osservatorio 5, Padova I-35122, ItalyAstrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UKSchool of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RJ, UKThe nearby long gamma-ray burst (GRB) 190829A was observed using the Hubble Space Telescope/Wide Field Camera 3/infrared 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 thousand km s ^−1 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 near-infrared triplet λλ 8498, 8542, 8662 (CaIR3). We also analyze Very Large Telescope/FOcal Reducer and low dispersion Spectrograph and X-shooter spectra of the supernova (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.https://doi.org/10.3847/1538-4357/ad8dd8Core-collapse supernovaeGamma-ray burstsSpectroscopy |
| spellingShingle | Kornpob Bhirombhakdi Andrew S. Fruchter Andrew J. Levan Elena Pian Paolo Mazzali Luca Izzo Tuomas Kangas Stefano Benetti Kyle Medler Nial Tanvir The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution The Astrophysical Journal Core-collapse supernovae Gamma-ray bursts Spectroscopy |
| title | The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution |
| title_full | The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution |
| title_fullStr | The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution |
| title_full_unstemmed | The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution |
| title_short | The Redshift of GRB 190829A/SN 2019oyw: A Case Study of GRB-SN Evolution |
| title_sort | redshift of grb 190829a sn 2019oyw a case study of grb sn evolution |
| topic | Core-collapse supernovae Gamma-ray bursts Spectroscopy |
| url | https://doi.org/10.3847/1538-4357/ad8dd8 |
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