astronomy

WD J0914+1914

WD J0914+1914 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 WD J0914+1914 rather than just read about it. In short: WD J0914+1914 is the first single white dwarf star found to have a giant planet orbiting it. Evidence of the giant planet was discovered by a team of astronomers from the UK, Chile and Germany.

Key takeaways

WD J0914+1914 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WD J0914+1914 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WD J0914+1914 from memory before moving on to harder problems.

Reference excerpt

WD J0914+1914 is the first single white dwarf star found to have a giant planet orbiting it. Evidence of the giant planet was discovered by a team of astronomers from the UK, Chile and Germany. The system was initially identified as a cataclysmic variable on the basis of weak H-alpha emissions in the spectrum by the Sloan Digital Sky Survey (SDSS). After closer inspection the team of astronomers discovered oxygen and sulfur lines in the SDSS spectra. The team then obtained spectroscopic follow-up observations with X-Shooter on ESO's Very Large Telescope. The spectra confirmed the previous observations by SDSS and found additional lines.

Planet system Dusty and gaseous debris disks around white dwarfs are known, but they are dominated by calcium lines and no previous disk around a white dwarf showed Hα emission. All previous disks around white dwarfs originate from rocky planetary bodies. The size of the disk around WD J0914+1914 was measured with the help of Doppler-broadbanded emission lines. The disk around the white dwarf is too large (~1-10 solar radii) to be formed by a small minor planet, which was tidally disrupted inside the Roche Radius. The team was also able to exclude accretion of material from a companion star or brown dwarf.

The most plausible explanation is an evaporating giant planet, orbiting close to the white dwarf. The atmosphere of the planet is evaporated by the strong ultraviolet radiation of the hot white dwarf. The planet is likely to be about 15 solar radii from the white dwarf and orbits it in 10 days. The composition of the accreted material shows similarity to certain deeper layers of the ice giants in the Solar System. The team estimated that the planet around WD J0914+1914 will, over the span of about 350 million years, lose about 0.04 Neptune masses, a negligible amount. Meanwhile, the dwarf will continue to cool.

See also List of exoplanets and planetary debris around white dwarfs WD 1145+017 ZTF J0139+5245

References

External links Evidence of an Alien Planet Spotted Around a White Dwarf, a Cosmic First Mike Wall, December 5, 2019 Gänsicke, Boris T.; Schreiber, Matthias R.; Toloza, Odette; Fusillo, Nicola P. Gentile; Koester, Detlev; Manser, Christopher J. (December 2019). "Accretion of a giant planet onto a white dwarf star". Nature. 576 (7785): 61–64. arXiv:1912.01611. Bibcode:2019Natur.576...61G. doi:10.1038/s41586-019-1789-8. PMID 31802017. S2CID 208617866.

Illustrations

Worked examples

Example 1 — a first encounter with WD J0914+1914

Start with the simplest possible case. Write down what WD J0914+1914 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 WD J0914+1914 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 WD J0914+1914 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 WD J0914+1914

In research: WD J0914+1914 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 WD J0914+1914 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: WD J0914+1914 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2019, Cancer (constellation), Cataclysmic variable stars, so understanding it makes those chapters shorter.
In everyday life: Look for WD J0914+1914 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 WD J0914+1914 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WD J0914+1914 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 WD J0914+1914 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WD J0914+1914 in simple terms?

WD J0914+1914 is the first single white dwarf star found to have a giant planet orbiting it. Evidence of the giant planet was discovered by a team of astronomers from the UK, Chile and Germany.

Why does WD J0914+1914 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 WD J0914+1914?

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 WD J0914+1914.