Author Topic: NASA - Transiting Exoplanet Survey Satellite ( TESS ) updates  (Read 69632 times)

Online Rondaz

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TESS finds two new warm Jupiters

18:54 21 July 2022

Astronomers have confirmed two new exoplanet discoveries with the TESS space telescope. The telescope found two warm Jupiters orbiting sun-like stars that may have migrated through their systems in the past. A preprint of the work is available at arXiv.org.

Most of the known exogiants found by the transit method are hot Jupiters with periods of revolution around their stars of less than ten days, which are characterized by a high temperature of the outer layers. Due to their proximity to parent stars, their orbits cannot provide enough information about the mechanism of formation of such objects. However, the orbital parameters of exogiants more distant from stars, such as warm Jupiters, are less influenced by the parent star. Their orbital periods are in the range from 10 to 200 days, as in the case of hot Jupiters, if warm Jupiters do not form in the orbits where they are found, then there is a need for a mechanism for the planet to migrate through the system, from the point of formation to the point of detection.

A team of astronomers led by Solčne Ulmer-Moll of the Geneva Observatory in Switzerland announced the confirmation of two new discoveries of warm Jupiters, designated NGTS-20b (TOI-5152b) and TOI-5153b. The objects were initially detected by the TESS space telescope using the transit method, later the discoveries were confirmed by the radial velocity method using the CORALIE, FEROS, HARPS, CHIRON and TRES spectrographs installed on ground-based telescopes, and by the transit method using the NGTS (Next Generation) ground-based telescope system. transit survey).

In the case of NGTS-20b, the host star has a mass of 1.47 solar masses, a radius of 1.78 solar radii, and a spectral type of G1. An exoplanet with a mass of 2.98 Jupiter masses and a radius of 1.07 Jupiter radii revolves around it with a period of 54.19 hours. The orbital eccentricity of NGTS-20b is 0.432, and the equilibrium temperature is 688 Kelvin. The age of the system is estimated to be between 1.4 and 6.8 billion years, it is located at a distance of about 1200 light years from the Sun.

The parent star of the planet TOI-5153b is of type F8, has a mass of 1.24 solar masses and a radius of 1.4 solar radii. The exoplanet itself has an orbital period of 20.33 days, a mass of 3.26 Jupiter masses, and a radius of 1.06 Jupiter radii. The orbital eccentricity of the exogiant is 0.091, the equilibrium temperature is 906 kelvin. The age of the system is estimated at 5.4 billion years, and the distance to it is about 1270 light years.

Both exoplanets are enriched in metals, and their abundances of heavy elements are consistent with mass-to-metallicity models for gas giants. It is hypothesized that they may have formed through a high eccentricity migration process or migrated towards the star due to interactions with an undetected companion. Further observations should more accurately determine their nature.

Earlier, we talked about how TESS found two rocky exoplanets around a red dwarf very close to the Sun and an ultra-hot Jupiter falling into a star.

Alexander Voytyuk

https://nplus1.ru/news/2022/07/21/tess-new-exogiants

Offline briantipton

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In the case of NGTS-20b, the host star has a mass of 1.47 solar masses, a radius of 1.78 solar radii, and a spectral type of G1. An exoplanet with a mass of 2.98 Jupiter masses and a radius of 1.07 Jupiter radii revolves around it with a period of 54.19 hours.



That should be 54.19 days, not hours

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