astronomy

SN 2021aefx

SN 2021aefx is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand SN 2021aefx rather than just read about it. In short: 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.

Key takeaways

SN 2021aefx belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SN 2021aefx to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SN 2021aefx from memory before moving on to harder problems.

Reference excerpt

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. It is located 61.2″ west and 36.5″ south of the center. It was discovered at apparent magnitude of 17.24 and classified as a high-velocity SN Type Ia.

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. 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. 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."

References

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. 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, Excess Emission, and Redward Color Evolution in the Infant Type Ia Supernova 2021aefx". The Astrophysical Journal. 959 (2): 132. arXiv:2304.00625. Bibcode:2023ApJ...959..132N. doi:10.3847/1538-4357/ad0640. "Supernova 2021aefx in NGC 1566". www.rochesterastronomy.org. Retrieved 21 January 2024.

Illustrations

Worked examples

Example 1 — a first encounter with SN 2021aefx

Start with the simplest possible case. Write down what SN 2021aefx claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to SN 2021aefx before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about SN 2021aefx ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of SN 2021aefx

In research: SN 2021aefx appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses SN 2021aefx in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: SN 2021aefx is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2021, Dorado, Type Ia supernovae, so understanding it makes those chapters shorter.
In everyday life: Look for SN 2021aefx outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study SN 2021aefx in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SN 2021aefx means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain SN 2021aefx out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SN 2021aefx in simple terms?

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.

Why does SN 2021aefx matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study SN 2021aefx?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on SN 2021aefx.