SN 2021aefx

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. It is located {{val|61.2|ul=arcsecond}} west and {{val|36.5|u=arcsecond}} south of the center. It was discovered at apparent magnitude of 17.24 and classified as a high-velocity SN Type Ia.

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.{{cite journal |last1=Ashall |first1=C. |last2=Lu |first2=J. |last3=Shappee |first3=B. J. |last4=Burns |first4=C. R. |last5=Hsiao |first5=E. Y. |last6=Kumar |first6=S. |last7=Morrell |first7=N. |last8=Phillips |first8=M. M. |last9=Shahbandeh |first9=M. |last10=Baron |first10=E. |last11=Boutsia |first11=K. |last12=Brown |first12=P. J. |last13=DerKacy |first13=J. M. |last14=Galbany |first14=L. |last15=Hoeflich |first15=P. |last16=Krisciunas |first16=K. |last17=Mazzali |first17=P. |last18=Piro |first18=A. L. |last19=Stritzinger |first19=M. D. |last20=Suntzeff |first20=N. B. |title=A Speed Bump: SN 2021aefx Shows that Doppler Shift Alone Can Explain Early Excess Blue Flux in Some Type Ia Supernovae |journal=The Astrophysical Journal Letters |date=1 June 2022 |volume=932 |issue=1 |pages=L2 |doi=10.3847/2041-8213/ac7235 |doi-access=free |arxiv=2205.00606 |bibcode=2022ApJ...932L...2A |issn=2041-8205 |display-authors=1}} 50px Material was copied from this source, which is available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0]

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.{{cite journal |last1=Chen |first1=Ness Mayker |last2=Tucker |first2=Michael A. |last3=Hoyer |first3=Nils |last4=Jha |first4=Saurabh W. |last5=Kwok |first5=Lindsey A. |last6=Leroy |first6=Adam K. |last7=Rosolowsky |first7=Erik |last8=Ashall |first8=Chris |last9=Anand |first9=Gagandeep |last10=Bigiel |first10=Frank |last11=Boquien |first11=Médéric |last12=Burns |first12=Chris |last13=Dale |first13=Daniel |last14=DerKacy |first14=James M. |last15=Egorov |first15=Oleg V. |last16=Galbany |first16=L. |last17=Grasha |first17=Kathryn |last18=Hassani |first18=Hamid |last19=Hoeflich |first19=Peter |last20=Hsiao |first20=Eric |last21=Klessen |first21=Ralf S. |last22=Lopez |first22=Laura A. |last23=Lu |first23=Jing |last24=Morrell |first24=Nidia |last25=Orellana |first25=Mariana |last26=Pinna |first26=Francesca |last27=Sarbadhicary |first27=Sumit K. |last28=Schinnerer |first28=Eva |last29=Shahbandeh |first29=Melissa |last30=Stritzinger |first30=Maximilian |last31=Thilker |first31=David A. |last32=Williams |first32=Thomas G. |title=Serendipitous Nebular-phase JWST Imaging of SN Ia SN 2021aefx: Testing the Confinement of ⁵⁶Co Decay Energy |journal=The Astrophysical Journal Letters |date=1 February 2023 |volume=944 |issue=2 |pages=L28 |doi=10.3847/2041-8213/acb6d8 |doi-access=free |arxiv=2301.05718 |bibcode=2023ApJ...944L..28C |issn=2041-8205 |display-authors=1|hdl=10261/337350 |hdl-access=free }} 50px Material was copied from this source, which is available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0]

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."{{cite journal |last1=DerKacy |first1=J. M. |last2=Ashall |first2=C. |last3=Hoeflich |first3=P. |last4=Baron |first4=E. |last5=Shappee |first5=B. J. |last6=Baade |first6=D. |last7=Andrews |first7=J. |last8=Bostroem |first8=K. A. |last9=Brown |first9=P. J. |last10=Burns |first10=C. R. |last11=Burrow |first11=A. |last12=Cikota |first12=A. |last13=de Jaeger |first13=T. |last14=Do |first14=A. |last15=Dong |first15=Y. |last16=Dominguez |first16=I. |last17=Galbany |first17=L. |last18=Hsiao |first18=E. Y. |last19=Karamehmetoglu |first19=E. |last20=Krisciunas |first20=K. |last21=Kumar |first21=S. |last22=Lu |first22=J. |last23=Evans |first23=T. B. Mera |last24=Maund |first24=J. R. |last25=Mazzali |first25=P. |last26=Medler |first26=K. |last27=Morrell |first27=N. |last28=Patat |first28=F. |last29=Phillips |first29=M. M. |last30=Shahbandeh |first30=M. |last31=Stangl |first31=S. |last32=Stevens |first32=C. P. |last33=Stritzinger |first33=M. D. |last34=Suntzeff |first34=N. B. |last35=Telesco |first35=C. M. |last36=Tucker |first36=M. A. |last37=Valenti |first37=S. |last38=Wang |first38=L. |last39=Yang |first39=Y. |last40=Jha |first40=S. W. |last41=Kwok |first41=L. A. |title=JWST Low-resolution MIRI Spectral Observations of SN 2021aefx: High-density Burning in a Type Ia Supernova |journal=The Astrophysical Journal Letters |date=28 February 2023 |volume=945 |issue=1 |pages=L2 |doi=10.3847/2041-8213/acb8a8 |doi-access=free |arxiv=2301.03647 |bibcode=2023ApJ...945L...2D |issn=2041-8205 |display-authors=1}}

{{reflist}}

• {{cite journal |last1=Blondin |first1=S. |last2=Dessart |first2=L. |last3=Hillier |first3=D. J. |last4=Ramsbottom |first4=C. A. |last5=Storey |first5=P. J. |title=Nebular spectra from Type Ia supernova explosion models compared to JWST observations of SN 2021aefx |journal=Astronomy & Astrophysics |date=October 2023 |volume=678 |pages=A170 |doi=10.1051/0004-6361/202347147|arxiv=2306.07116 |bibcode=2023A&A...678A.170B }}
• {{cite arXiv |last1=Ni |first1=Yuan Qi |last2=Moon |first2=Dae-Sik |last3=Drout |first3=Maria R. |last4=Matzner |first4=Christopher D. |last5=Leong |first5=Kelvin C. C. |last6=Kim |first6=Sang Chul |last7=Park |first7=Hong Soo |last8=Lee |first8=Youngdae |title=Origin of high-velocity ejecta and early red excess emission in the infant Type Ia supernova 2021aefx |date=2023 |class=astro-ph.HE |eprint=2304.00625}}
• {{cite web |title=Supernova 2021aefx in NGC 1566 |url=https://www.rochesterastronomy.org/sn2021/sn2021aefx.html |website=www.rochesterastronomy.org |access-date=21 January 2024}}

{{Supernovae}}

Category:Supernovae