SN 2019np
| Event type | Supernova |
|---|---|
| Type Ia | |
| Constellation | Leo Minor |
| Right ascension | 10h 29m 21.980s |
| Declination | +29° 30′ 38.30″ |
| Epoch | J2000 |
| Distance | 107.0 ± 22.2 Mly (32.80 ± 6.8 Mpc) |
| Redshift | 0.00452 |
| Host | NGC 3254 |
| Colour (B-V) | −0.06±0.03 |
| Peak apparent magnitude | 13.62±0.15 |
SN 2019np was a Type Ia supernova event in NGC 3254, which is an unbarred spiral galaxy in the northern Constellation of Leo Minor. Based on the Tully–Fisher relation, this galaxy is located at a distance of 107.0 ± 22.2 million light-years (32.80 ± 6.8 Mpc) from the Milky Way. This supernova was discovered January 9, 2019 by Kōichi Itagaki, and reached maximum two weeks later. It was the brightest supernova observed in the year 2019.
Observations
This supernova was discovered by Japanese amateur astronomer Kōichi Itagaki on January 9, 2019, using a 0.35-m telescope. The early spectrum was consistent with a Type Ia supernova. On January 11, it was measured at an apparent visual magnitude of 16.68 with an estimated two weeks until maximum. It reached visual magnitude 13.6 at maximum.
The spectral evolution of SN 2019np followed the normal pattern for a Type Ia supernova. The velocity of the ejecta was around 10,200 km/s at maximum, as measured from ionized silicon. Early observations showed an infrared excess, which may be explained by a collision between the ejecta and a companion star. The data is best explained by a solar mass companion on the main sequence.
The explosion data is most consistent with a carbon-oxygen white dwarf that evolved from a star with five times the mass of the Sun. This compact object accreted matter from its companion until its mass approached the Chandrasekhar limit, when it detonated. The explosion generated an estimated 0.66±0.05 M☉ of synthesized nickel.
References
- 1 2 3 Wu, Chengyuan; et al. (January 2019), "Spectroscopic Classification of AT 2019np as a Young Type Ia Supernova", The Astronomer's Telegram (12374): 1, Bibcode:2019ATel12374....1W.
- 1 2 3 4 5 6 "SN 2019np", Transient Name Server, IAU Supernova Working Group, retrieved 2026-03-21.
- 1 2 3 4 5 6 7 Sai, Hanna; et al. (August 11, 2022), "Observations of the very young Type Ia Supernova 2019np with early-excess emission", Monthly Notices of the Royal Astronomical Society, 514 (3): 3541–3558, arXiv:2205.15596, Bibcode:2022MNRAS.514.3541S, doi:10.1093/mnras/stac1525, ISSN 0035-8711.
- 1 2 Konyves-Toth, R.; et al. (January 2019), "BVRI Photometry of the Young Type Ia SN 2019np", The Astronomer's Telegram (12378): 1, Bibcode:2019ATel12378....1K.
- ↑ Bishop, David, "Bright Supernovae - 2019", Rochester Astronomy, retrieved 2024-12-09.
- ↑ Kilpatrick, C. D.; Foley, R. J. (January 2019), "Spectroscopic Classification of AT2019np with Faulkes-North/FLOYDS", The Astronomer's Telegram (12375): 1, Bibcode:2019ATel12375....1K.
- ↑ Hoeflich, Peter; et al. (March 2023), "The core normal Type Ia supernova 2019np - an overall spherical explosion with an aspherical surface layer and an aspherical 56Ni core", Monthly Notices of the Royal Astronomical Society, 520 (1): 560–582, arXiv:2301.04721, Bibcode:2023MNRAS.520..560H, doi:10.1093/mnras/stad172.
Further reading
- Perez-Torres, M.; et al. (January 2019), "Radio constraints on the mass-loss rate of the Type Ia SN 2019np", The Astronomer's Telegram (12411): 1, Bibcode:2019ATel12411....1P.
- Konyves-Toth, R.; et al. (January 2019), "BVRI Photometry of the Young Type Ia SN 2019np", The Astronomer's Telegram (12378): 1, Bibcode:2019ATel12378....1K.
