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SN 2021aefx

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SN 2021aefx
SN 2021aefx in NGC 1566 at ≈2–21 μm. Left panel: MIRI F1130W PHANGS-JWST image of NGC 1566 showing the location of SN 2021aefx, marked with a green circle. Right panels: zoom-ins on SN 2021aefx in each PHANGS-JWST filter.[1]
Ia
Right ascension04h 19m 53.402s[2]
Declination−54° 56′ 53.08″[2]
Distance17.69 ± 2.02 Mpc[1]
Redshift0.00502 ± 0.00001[1]
HostNGC 1566
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SN 2021aefx is a Type Ia supernova discovered in 2021 in the galaxy NGC 1566.

Discovery

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SN 2021aefx was discovered on November 11, 2021, by the Distance Less Than 40 Mpc (DLT40) transient survey in the spiral galaxy NGC 1566 at a distance of 17.69 ± 2.02 Mpc.[1] It is located 61.2″ west and 36.5″ south of the center.[2] It was discovered at apparent magnitude of 17.24 and classified as a high-velocity SN Type Ia.[3]

Observations

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SN 2021aefx was observed in multiband by the Precision Observations for Infant Supernovae Explosions (POISE) a day after discovery. The photometry was obtained on the 1 m Swope Telescope at the Las Campanas Observatory. Observations were acquired twice per night in order to look for small scale fluctuations in the light curve.[3]

The brightness and close proximity of SN 2021aefx make it an excellent target for nebular-phase James Webb Space Telescope observations. Kwok et al. (2022) and DerKacy et al. (2023) provided the first demonstration of the impressive spectroscopic capabilities of JWST for studying nebular-phase SNe Ia. Their spectra of SN 2021aefx, obtained +255 and +323 days after, respectively, represent the highest-quality look at the emission properties >2.5 μm of SNe Ia to date. Their spectra show prominent emission features from the iron-group elements (Ni, Co, Fe), as well as a wide, flat-topped [Ar iii] profile that indicates a spherical shell of emission.[1]

Researchers show that "the observations of SN 2021aefx are consistent with an off-center delayed detonation explosion of a near–Chandrasekhar mass (MCh) WD at a viewing angle of −30° relative to the point of the deflagration to detonation transition."[4]

References

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  1. ^ a b c d e Chen, Ness Mayker; et al. (1 February 2023). "Serendipitous Nebular-phase JWST Imaging of SN Ia SN 2021aefx: Testing the Confinement of 56Co Decay Energy". The Astrophysical Journal Letters. 944 (2): L28. Bibcode:2023ApJ...944L..28C. doi:10.3847/2041-8213/acb6d8. hdl:10261/337350. ISSN 2041-8205. Material was copied from this source, which is available under a Creative Commons Attribution 4.0
  2. ^ a b c "Bright Supernovae - 2021". www.rochesterastronomy.org. Retrieved 21 January 2024.
  3. ^ a b Ashall, C.; et al. (1 June 2022). "A Speed Bump: SN 2021aefx Shows that Doppler Shift Alone Can Explain Early Excess Blue Flux in Some Type Ia Supernovae". The Astrophysical Journal Letters. 932 (1): L2. arXiv:2205.00606. Bibcode:2022ApJ...932L...2A. doi:10.3847/2041-8213/ac7235. ISSN 2041-8205. Material was copied from this source, which is available under a Creative Commons Attribution 4.0
  4. ^ DerKacy, J. M.; et al. (28 February 2023). "JWST Low-resolution MIRI Spectral Observations of SN 2021aefx: High-density Burning in a Type Ia Supernova". The Astrophysical Journal Letters. 945 (1): L2. arXiv:2301.03647. Bibcode:2023ApJ...945L...2D. doi:10.3847/2041-8213/acb8a8. ISSN 2041-8205.

Further reading

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  • Blondin, S.; Dessart, L.; Hillier, D. J.; Ramsbottom, C. A.; Storey, P. J. (October 2023). "Nebular spectra from Type Ia supernova explosion models compared to JWST observations of SN 2021aefx". Astronomy & Astrophysics. 678: A170. arXiv:2306.07116. Bibcode:2023A&A...678A.170B. doi:10.1051/0004-6361/202347147.
  • Ni, Yuan Qi; Moon, Dae-Sik; Drout, Maria R.; Matzner, Christopher D.; Leong, Kelvin C. C.; Kim, Sang Chul; Park, Hong Soo; Lee, Youngdae (2023). "Origin of high-velocity ejecta and early red excess emission in the infant Type Ia supernova 2021aefx". arXiv:2304.00625 [astro-ph.HE].
  • "Supernova 2021aefx in NGC 1566". www.rochesterastronomy.org. Retrieved 21 January 2024.
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