Astronomy:SN 2021aefx

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SN 2021aefx
SN 2021aefx in NGC 1566.jpg
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]
Spectral classIa
Right ascensionTemplate:Ra[2]
Declination−54° 56′ 53.08″[2]
Distance17.69 ± 2.02 Mpc[1]
Redshift0.00502 ± 0.00001[1]
HostNGC 1566
[edit on Wikidata]

SN 2021aefx is a Type Ia supernova discovered in 2021 in the galaxy NGC 1566.

Discovery

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

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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. doi:10.3847/2041-8213/acb6d8. ISSN 2041-8205. Bibcode: 2023ApJ...944L..28C.  CC BY icon.svg Material was copied from this source, which is available under a Creative Commons Attribution 4.0
  2. ↑ 2.0 2.1 2.2 "Bright Supernovae - 2021.". https://www.rochesterastronomy.org/sn2021/index.html#2021aefx. 
  3. ↑ 3.0 3.1 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. doi:10.3847/2041-8213/ac7235. ISSN 2041-8205. Bibcode: 2022ApJ...932L...2A.  CC BY icon.svg 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. doi:10.3847/2041-8213/acb8a8. ISSN 2041-8205. Bibcode: 2023ApJ...945L...2D. 

Further reading

  • 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. doi:10.1051/0004-6361/202347147. Bibcode: 2023A&A...678A.170B. 
  • 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". https://www.rochesterastronomy.org/sn2021/sn2021aefx.html. 



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