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New exoplanet discovery builds better understanding of planet formation

August 4, 2023
in Science
New exoplanet discovery builds better understanding of planet formation
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exoplanet

Credit: Pixabay/CC0 Public Domain

An international team of scientists has discovered an unusual Jupiter-sized planet orbiting a low-mass star called TOI-4860, located in the Corvus constellation.

The newly discovered gas giant, named TOI-4860 b, is an unusual planet for two reasons: Stars of such low mass are not expected to host planets like Jupiter, and the planet appears to be particularly enriched by heavy elements.

The study, led by University of Birmingham astronomers, is published today in a letter published within the Monthly Notices of the Royal Astronomical Society.

The planet was initially identified using NASA’s Transiting Exoplanet Survey Satellite as a drop of brightness while transiting in front of its host star, but that data alone was insufficient to confirm that it was a planet.

The team used the SPECULOOS South Observatory, located in the Atacama Desert in Chile, to measure the planetary signal in several wavelengths and validated the planetary nature. The astronomers also observed the planet just before and after it disappeared behind its host star, noticing that there was no change in light, meaning the planet was not emitting any. Finally, the team collaborated with a Japanese group using the Subaru Telescope in Hawai’i. Together they measured the mass of the planet to fully confirm it.

Following this star and confirming its planet was the initiative of a group of Ph.D. students within the SPECULOOS project.

George Dransfield, one of those Ph.D. students, who recently submitted her thesis at the University of Birmingham, explains, “Under the canonical planet formation model, the less mass a star has, the less massive is the disc of material around that star.

“Since planets are created from that disc, high-mass planets like Jupiter, were widely expected not to form. However, we were curious about this and wanted to check planetary candidates to see if it was possible. TOI-4860 is our first confirmation and also the lowest mass star hosting such a high mass planet.”

Amaury Triaud, Professor of Exoplanetology at the University of Birmingham who led the study, said, “I am ever thankful to the bright Ph.D. students of our team for proposing to observe systems like TOI-4860. Their work has really paid off since planets like TOI-4860 are vital to deepening our understanding of planet formation.

“A hint of what might have happened is hidden in the planetary properties, which appear particularly enriched in heavy elements. We have detected something similar in the host star too, so it is likely that an abundance of heavy elements catalyzed the planet formation process.”

The new gas giant takes about 1.52 days to complete a full orbit around its host star, but because its host is a cold low mass star, the planet itself can be referred to as a “warm Jupiter.” This is a subclass of planet that holds particular interest for astronomers looking to build on their initial observations and learn more about how these kinds of planets are formed.

Mathilde Timmermans, another student of the SPECULOOS project working at the University of Liege in Belgium, concludes, “Thanks to its very short orbital period, and to the properties of its host star, the discovery of TOI-4860 b provides a brilliant opportunity to study the atmospheric properties of a warm Jupiter and learn more about how gas giants are formed.”

Recently the team has been awarded telescope time at the Very Large Telescope, in Chile, which they intend to use to confirm several more planets with similar properties.

More information:
Amaury Triaud et al, An M-dwarf accompanied by a close-in giant orbiter, Monthly Notices of the Royal Astronomical Society (2023). DOI: 10.1093/mnrasl/slad097 , academic.oup.com/mnrasl/articl … .1093/mnrasl/slad097

Citation:
New exoplanet discovery builds better understanding of planet formation (2023, August 3)
retrieved 3 August 2023
from https://phys.org/news/2023-08-exoplanet-discovery-planet-formation.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2023-08-exoplanet-discovery-planet-formation.html

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