Two massive Jupiter-sized exoplanets discovered with TESS

Two massive Jupiter-sized exoplanets discovered with TESS

Two massive Jupiter-sized exoplanets discovered with TESS

Photometric observations of TOI-5153 from TESS. Credit: Ulmer-Moll et al., 2022.

Using NASA’s Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has detected two new extrasolar planets. The new alien worlds, designated TOI-5152 b and TOI-5153 b, are the size of Jupiter but about three times as massive as the largest planet in the solar system. The discovery is published July 8 on the arXiv preprint repository.

TESS is surveying about 200,000 of the brightest stars near the sun in an effort to search for transiting exoplanets. It has identified more than 5,700 candidate exoplanets (TESS Objects of Interest, or TOI), of which 227 have been confirmed so far.

A group of astronomers led by Solène Ulmer-Moll of the Geneva Observatory in Switzerland recently confirmed two more TOI planets monitored by TESS. They report that transit signals have been identified in the light curves of two stars called TOI-5152 and TOI-5153. The planetary nature of these signals has been confirmed by follow-up observations.

“Discovery photometry was collected with the TESS space mission and follow-up observations were made from the ground with the NGTS photometric facility and the CORALIE, FEROS, CHIRON, HARPS and TRES high-resolution spectrographs,” the researchers said. researchers. written in the newspaper.

TOI-5152 has a radius of about 1.07 Jupiter radii and is about three times as massive as Jupiter. It orbits its parent star every 54.19 days, at a distance of about 0.31 AU from it. The planet’s equilibrium temperature has been measured at 688 K. Host TOI-5152 is a G1-type star nearly twice the size of the Sun, located about 1,200 light-years from Earth. Its age is estimated between 1.4 and 6.8 billion years.

TOI-5153 has a mass of 3.26 Jupiter masses, while its radius has been estimated at 1.06 Jupiter radii. The orbital period of this exoplanet has been measured at 20.33 days and its distance from the host is almost 0.16 AU. Astronomers have calculated that the equilibrium temperature of TOI-5153 b is at a level of 906 K. The parent star is of spectral type F8. It is about 40% larger than the sun and is believed to be 5.4 billion years old. The distance to this planetary system is approximately 1,270 light years.

Therefore, TOI-5152 b and TOI-5153 b are hot and massive Jupiter-sized alien worlds. The astronomers noted that they are both metal-enriched and that their heavy element content is consistent with the mass-metallicity relationship of the gas giants. Since both planets orbit moderately bright stars, the paper’s authors added that they are ideal targets for additional observations.

“Both hot Jupiters orbit moderately bright host stars, making these objects valuable targets for tracking studies of the planetary atmosphere and measurement of the system’s spin-orbit angle,” the researchers concluded.

Four new giant exoplanets detected

More information:
S. Ulmer-Moll et al, Two long-period transiting exoplanets in eccentric orbits: NGTS-20 b (TOI-5152 b) and TOI-5153 b. arXiv:2207.03911v1 [astro-ph.EP]

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