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An ultra-short-period exoplanet discovered with TESS
TESS target pixel file image of HD 20329 observed in sector 42. Credit: Murgas et al, 2022

A new exoplanet has been detected using NASA's transiting exoplanet survey satellite. HD 20329 b, a new alien world, was barely visible to the naked eye. On November 4th, the finding was presented.

The aim of the survey is to find transiting exoplanets, which are planets outside the solar system. There are nearly 6,000 candidate exoplanets that have been identified so far.

Felipe Murgas is an astronomer at the University of La Laguna in Spain. A transit signal has been found in the light curve of the solar-type star HD 20329. The planetary nature of the signal was confirmed by the follow up radial velocity measurement.

The researchers reported the discovery of HD 20329 b, an ultra- short-period planet around a bright G-type star.

HD 20329 b is 7.42 times larger than our planet and has a mean bulk density of 8.06 g/ cm 3. This exoplanet takes about 22 hours to fully circle its host. HD 20329 b is located just 0.018AU from the star and has an equilibrium temperature of 2,000 K.

HD 20329 b is the latest addition to the list of known ultra- short-period exoplanets. Further observations are needed to confirm that there are more objects in the HD 20329 system.

The RV residuals present a slope that may indicate the presence of an additional low-mass object after subtracting the planetary signal of theUSP planet.

The emission spectroscopy metric shows that HD 20329 b presents favorable conditions for follow-up with NASA's James Webb Space Telescope.

The parameters of the host star HD 20329 were found to be less massive than the sun. The star is 11 billion years old and has a metallicity of -07.

HD 20329b is an ultra- short-period planet around a star. There is a book titled "arxiv.2211.02547."

Journal information: arXiv

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