“We file the discovery of a planetary system orbiting HD 137496 (K2-364). With photometry from K2 and accurate RVs from every HARPS and CORALIE spanning over two years, we’re ready to accurately speak the stellar host, eye its chemical composition, and set apart steady constraints on the planetary companions,” the researchers wrote in the paper.
The exoplanet closer to the neatly-known particular person, designated HD 137496 b is about 30 p.c increased than the Earth and around four times more giant than our planet, what presents density at a degree of 10.49 g/cm3. This planet consists mainly of iron, with the core representing over 70 p.c of the thing’s mass. HD 137496 b orbits its host every 1.62 days, at a distance of about 0.027 AU from it, hence its equilibrium temperature is estimated to be some 2,130 Good adequate. On account of this fact, the extrasolar world used to be categorized as a hot desirable-Mercury—an Earth-sized planet with the density of the solar system’s smallest planet.
The 2nd newly learned exoplanet obtained designation HD 137496 c. It used to be categorized as a chilly Jupiter, provided that its minimum mass used to be calculated to be about 7.66 Jupiter loads and its equilibrium temperature is roughly 370 Good adequate. The planet orbits HD 137496 on a extremely eccentric orbit (with an eccentricity of 0.477) every 480 days, separated by 1.21 AU from the neatly-known particular person.
With an age of about 8.3 billion years, mass of 1.03 solar loads and radius of roughly 1.59 solar radii, HD 137496 is characterised as a a miniature bit evolved sun-fancy neatly-known particular person. Its efficient temperature is 5,799 Good adequate, whereas its metallicity used to be learned to be at a degree of -0.03.
In concluding remarks, the astronomers underlined the peculiarity of the newly detected planetary system. They noteworthy that HD 137496 b is one in every of easiest just a few successfully-characterised dense planets, what makes it a charming target for testing planet formation theories, density making improvements to mechanisms, and moreover the presence of an prolonged comet-fancy mineral rich exosphere. Moreover, provided that HD 137496 c is a high-eccentricity planet, this methodology on the overall is also a charming target for planetary evolution studies.
T. A. Silva et al, The HD 137496 system: A dense, hot desirable-Mercury and a chilly Jupiter. arXiv: 2111.08764v1 [astro-ph.EP], arxiv.org/abs/2111.08764
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