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Astronomers uncover a sub-Neptune exoplanet orbiting close by star

Photometric observations of TOI-2257 with the best-fit transit parameters over-plotted. Credit: Schanche et al., 2021.

Using NASA’s Transiting Exoplanet Survey Satellite (TESS), a world staff of astronomers has detected a sub-Neptune exoplanet orbiting a close-by M dwarf star. The newly discovered alien world, designated TOI-2257b is about two instances bigger than the Earth. The discovering is reported in a paper revealed November 2 on the arXiv pre-print server.

TESS is conducting a survey of about 200,000 of the brightest stars close to the sun with the purpose of looking for transiting exoplanets. So far, it has recognized over 4,600 candidate exoplanets (TESS Objects of Interest, or TOI), of which 167 have been confirmed to this point.

Recently, a bunch of astronomers led by Nicole Schanche of the University of Bern in Switzerland has confirmed one other TOI monitored by TESS. While observing a close-by M-dwarf often called TOI-2257 (different designation TIC 198485881), a transit sign was recognized within the gentle curve of this star. The planetary nature of this sign was confirmed by follow-up observations utilizing ground-based services.

“This work presents the discovery and characterization of TOI-2257b, a sub-Neptune in a relatively long-period orbit around an M3V star. The preliminary characterization is based on photometry from TESS and several ground-based facilities, with spectral analysis and high-resolution imaging supporting the validation,” the researchers wrote within the paper.

According to the examine, TOI-2257b has a radius of about 2.19 Earth radii and is a few 5.71 instances extra large than our planet. The exoworld orbits its mum or dad star each 35.19 days on a extremely eccentric orbit (with an eccentricity of almost 0.5) at a distance of 0.145 AU from it. The planet’s equilibrium temperature is estimated to be 256 Okay.

The host TOI-2257 is an M dwarf at the very least 8 billion years previous and its spectral sort was discovered to be M3V. The star, positioned simply 188 gentle years away, is about one-third the dimensions and mass of the sun, has a metallicity at a degree of -0.27, and an efficient temperature of round 3,430 Okay.

Summing up the outcomes, the astronomers famous that the newly discovered exoplanet has a comparatively lengthy orbital interval, as solely two different transiting exoplanets round M dwarfs with durations better than that of TOI-2257 b are identified up to now. Moreover, it is usually essentially the most eccentric exoplanet transiting an M dwarf to this point detected, what affords a terrific alternative to check numerous attainable planet formation eventualities.

The authors of the paper take into account additional observations of TOI-2257, hoping to search out extra planets within the system and even liquid water within the environment of TOI-2257b.

“This planet is one of only a small number of sub-Neptunes for which liquid water is a possibility. The expected TSM [transmission spectroscopy metric] of the object make it amenable to more detailed atmospheric characterization from JWST [James Webb Space Telescope],” the researchers concluded.

Astronomers discover twin sub-Neptune exoplanets orbiting nearby star

More data:
N. Schanche et al, TOI-2257 b: A extremely eccentric long-period sub-Neptune transiting a close-by M dwarf. arXiv:2111.01749v1 [astro-ph.EP], arxiv.org/abs/2111.01749

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Astronomers uncover a sub-Neptune exoplanet orbiting close by star (2021, November 11)
retrieved 11 November 2021
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