b Centauri b – The Exoplanet That Shouldn’t Exist

Astronomers have so far confirmed the existence of more than 4,500 exoplanets. Some are highly unusual, even astonishing. There are also planets that seem to contradict current scientific theories about how planets form. One example is a newly discovered planet orbiting the b Centauri star.

Planet b Centauri b

The b Centauri star¹ is located in the constellation Centaurus, 325 light-years from the Sun. It is not a single star but a binary system. The primary star is of spectral type B, meaning it is one of the most massive and hottest known stars. It is three times hotter than the Sun. The exact characteristics of the second star remain unclear. The binary system is thought to be only 15 million years old, which is very young on the stellar evolutionary timescale.

It is around this system that a remarkable planet has been found. Scientists detected it using direct imaging with the VLT (Very Large Telescope) in Chile, operated by the European Southern Observatory. According to naming conventions, the planet was named b Centauri b.³

The uniqueness of b Centauri b

The planet b Centauri b is unusual in several ways. It orbits a star once thought unlikely to host any planets.⁴ The binary star b Centauri has a mass between six and ten times greater than that of the Sun. Large planets are usually found around stars with masses up to 1.9 times that of the Sun. In the case of more massive stars, planets are much less common, and it was thought that planets do not form around stars with a mass three times greater than the Sun’s.

Second, b Centauri b orbits its host binary star at a distance of about 550 astronomical units (AU).⁵ By comparison, Jupiter is located 5.2 AU from the Sun, and Neptune about 30 AU.⁶ This means that b Centauri b is 100 times farther from its star than Jupiter and about 18 times farther than Neptune. As such, it is the exoplanet with the greatest known distance from its host star. Interestingly, its orbit appears stable and nearly circular, similar to the planets in our solar system.

Third, b Centauri b is enormous. Its mass is 10.9 times that of Jupiter, which also partially translates to its size. Such mass values approach the threshold for classifying the planet as a brown dwarf, usually placed between 13 and 80 times the mass of Jupiter.⁷

An impossible planet?

Given all the parameters and conditions surrounding this newly discovered planet, scientists are asking how it could have formed at all. To summarise:

• b Centauri b orbits a binary star whose mass is far greater than that of stars around which planets are usually found.
• The planet is on a stable orbit at a distance of about 550 AU from the star, much farther than any other known planet.
• The planet’s mass is nearly 11 times that of Jupiter.

The existence of a planet with such a mass is not strange in itself. Astronomers discover celestial bodies in space that are sometimes difficult to classify as either planets or stars.⁸ The problem lies in the fact that this particular planet appeared around such a massive star, at such a distance from it. This creates numerous challenges for the scientific theory of spontaneous planet formation.

Furthermore, the issue is that such a planet orbits a star of spectral type B. The theory of planet formation states that after a star forms, the remaining gas and dust around it create a protoplanetary disk from which planets then form. Planets cannot form around stars that are too massive and hot, as the intense radiation from such stars quickly disperses the surrounding gas and dust. Without this material, there is nothing from which planets can form.⁹ How, then, did b Centauri b come into existence?

With God, all things are possible!

While scientists are enthusiastic about the discovery, they now need to find a new theory to explain how planets form.¹⁰ Some think that the formation of this planet was a one-off case. Still, this is not the first time exoplanets have surprised astronomers. The first ones, found in 1992 around a pulsar, came as a shock to scientists who believed that planets could not exist in such conditions.¹¹

The universe keeps revealing things we do not expect. Scientific theories are often replaced as knowledge grows. The God who created the universe has not finished revealing what is possible. Even if every explanation falls short, the ultimate reason still points to the Creator. For now, scientists will continue searching for answers.

By the way, we recommend reading the articles:

• The Origin of the Moon: Coincidence or Design?
• Is Half of Humanity Right to Believe in Aliens?
• Hyperbaric Oxygen Therapy and Pre-Flood Longevity
• Can Scientists Prove That the Universe Cannot Be Eternal?
• The Formation of the Solar System: What Do We Really Know?

Footnotes

1. Not to be confused with β Centauri, nor with B Centauri. In the Henry Draper Catalog, it is also designated as HD 129116.
2. Janson, M. et al., 2021. ‘A wide-orbit giant planet in the high-mass b Centauri binary system’, Nature. Available at: https://www.nature.com/articles/s41586-021-04124-8.
3. The first discovered planet around a given star is designated as ‘b’, and subsequently discovered planets receive successive letters of the alphabet.
4. The first discovered planet around a given star is designated as ‘b’, and subsequently discovered planets receive successive letters of the alphabet.
5. Wall, M., 2021. ‘Record-breaking alien planet spotted circling massive, superhot star duo (photo)’, Space.com. 8 December. Available at: https://www.space.com/exoplanet-b-centauri-b-hot-massive-star-system.
6. An astronomical unit is a unit of distance equal to the average distance from the Earth to the Sun.
7. EarthSky, 2020. ‘What are brown stars?’, EarthSky. 5 September. Available at: https://earthsky.org/space/definition-what-are-brown-dwarfs/.
8. EarthSky, 2020. ‘What are brown stars?’, EarthSky. 5 September. Available at: https://earthsky.org/space/definition-what-are-brown-dwarfs/.
9. Ly, C., 2021. ‘An unexpected giant planet is orbiting a massive pair of stars’, New Scientist. 8 December. Available at: https://www.newscientist.com/article/2300742-an-unexpected-giant-planet-is-orbiting-a-massive-pair-of-stars/.
10. Ly, C., 2021. ‘An unexpected giant planet is orbiting a massive pair of stars’, New Scientist. 8 December. Available at: https://www.newscientist.com/article/2300742-an-unexpected-giant-planet-is-orbiting-a-massive-pair-of-stars/.
11. Lisle, J., 2011. ‘Exoplanets – Unpredictable Patterns’, Answers in Genesis. 1 January. Available at: https://answersingenesis.org/astronomy/extrasolar-planets/exoplanets-unpredictable-patterns/.

© Source of main image: Leonardo.ai.

Evolution of Thinking - Sebastian S.

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