European astronomers have carried out photometric and spectroscopic observations of a distant large exoplanet generally known as TOI-837 b. In consequence, they discovered that TOI-837 b is a younger Saturn-sized planet containing a large core, which challenges present core formation theories. The findings are offered in a paper published on the preprint server arXiv.
TOI-837 b was found in 2020, orbiting a younger (about 35 million years outdated) dwarf star of spectral sort F9/G0 within the open cluster IC 2602, about 465 light years away. The planet orbits its host each 8.32 days and was discovered to have a radius of roughly 0.77 Jupiter radii. The star TOI-837 is in regards to the dimension of the sun, has a mass of about 1.14 solar masses, and its effective temperature is almost 6,000 Okay.
The staff of astronomers, led by Oscar Barragán of the College of Oxford, UK, determined to conduct follow-up photometric and spectroscopic observations of TOI-837 b to be able to additional characterize its properties and nature. For this function, they employed NASA’s Transiting Exoplanet Survey Satellite tv for pc (TESS) and numerous ground-based amenities.
“We current an exhaustive photometric and spectroscopic evaluation of TOI-837, a F9/G0 35 Myr younger star, internet hosting a transiting exoplanet, TOI-837 b, with an orbital period of 8.32 days,” the researchers wrote within the paper.
The remark discovered that TOI-837 b has a radius of 0.817 Jupiter radii and its mass is roughly 0.395 Jupiter plenty, which yields a density at a degree of 0.89 g/cm3. The planet is separated from the star by 0.088 AU and its equilibrium temperature is estimated to be about 1,000 Okay.
The astronomers underlined that the derived properties of TOI-837 b, primarily its density, younger age and distance to the star, counsel a core mass of roughly 70 Earth plenty (0.22 Jupiter plenty), due to this fact accounting for about 60% of the planet’s total mass.
The researchers famous that such a considerable core inside a comparatively younger planetary physique poses a problem for present fashions of planet formation and core accretion, particularly because of the comparatively low stellar metallicity—at a degree of 0.01 dex.
“Our investigation into the TOI-837 system and its intriguing companion, TOI-837 b, unveils a younger Saturn-sized exoplanet that defies typical expectations with its surprising huge core,” the authors wrote.
On account of its distinctive traits, TOI-837 b must be a goal of superior atmospheric characterization. As an example, a measurement of the planetary atmospheric bulk metallic fraction has the potential to uncover the true nature of its vital core. Such research might be carried out with the James Webb House Telescope (JWST).
Extra info:
Oscar Barragán et al, TOI-837b is a Younger Saturn-sized Exoplanet with a Large 70 M⊕ Core, arXiv (2024). DOI: 10.48550/arxiv.2404.13750
Journal info:
arXiv
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TOI-837 b is a younger Saturn-sized exoplanet with a large core, observations discover (2024, Could 2)
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