THYME project discovers a sub-Neptune exoplanet orbiting young star

THYME project discovers a sub-Neptune exoplanet orbiting young star
TESS mild curve of HD 110082. score: Tofflemire et al., 2021.

Astronomers report the invention of a brand new sub-Neptune exoplanet as a part of the TESS Hunt for Younger and Maturing Exoplanets (THYME) program. The newly discovered alien world, designated HD 110082 b, is about thrice bigger than the Earth and orbits a comparatively younger . The discovering is reported in a printed February 11 on arXiv.org.


NASA’s Transiting Exoplanet Survey Satellite tv for pc (TESS) is conducting a survey of about 200,000 of the brightest close to the solar with the goal of trying to find transiting exoplanets. Up to now, it has recognized practically 2,500 candidate exoplanets (TESS of Curiosity, or TOI), of which 107 have been confirmed thus far.

The THYME collaboration goals to establish transiting stars in close by, younger, coeval populations. Up to now, the venture has detected three and the discovering of one other one is reported in a just lately printed paper. The workforce, led by Benjamin M. Tofflemire of the College of Texas at Austin, have recognized a sign within the mild curve of the star HD 110082 (or TOI-1098). The planetary nature of this sign was confirmed by follow-up observations.

“We report on the invention of a sub-Neptune-size planet orbiting the younger star HD 110082 (TOI-1098). Transit occasions we initially detected throughout TESS Cycle 1 are validated with time-series photometry from Spitzer. Excessive-contrast imaging and high-resolution optical spectra are additionally obtained to characterize the stellar host and make sure the planetary nature of the transits,” the astronomers wrote within the examine.

HD 110082 b has a radius of roughly 3.2 Earth radii and is assumed to be some 11 occasions extra large than our planet. It orbits its host each 10.18 days, at a distance of about 0.113 AU from it. The transit period of this planet means that it has a low orbital eccentricity, most probably at a degree of round 0.2. On condition that the HD 110082 system is estimated to be comparatively younger (some 250 million outdated), the newly discovered alien world may very well be very useful in testing planet formation and evolution theories.

The is of spectral F8V situated about 343 mild years away. It has a radius of round 1.19 voltaic radii and a mass of roughly 1.12 photo voltaic plenty. The star has an efficient temperature of about 6,200 Okay and a metallicity at a degree of some 0.08. The thing is assumed to reside in a newly detected younger stellar affiliation designated MELANGE-1.

The findings present vital clues about parameters of younger extrasolar worlds typically. “HD 110082 b’s radius within the largest 12 % of field-age programs with comparable host star mass and orbital interval. This discovering helps earlier research indicating that younger planets have bigger radii than their field-age counterparts,” the authors of the paper concluded.

The astronomers additionally discovered that HD 110082 has a low-mass M dwarf companion. The thing is estimated to have a mass of some 0.26 photo voltaic plenty and is separated from HD 110082 by roughly 6,200 AU.


Two young planetary systems detected by TESS


Extra info:
TESS Hunt for Younger and Maturing Exoplanets (THYME) V: A Sub-Neptune Transiting a Younger Star in a Newly Found 250 Myr Affiliation, arXiv:2102.06066 [astro-ph.EP] arxiv.org/abs/2102.06066

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THYME venture discovers a sub-Neptune exoplanet orbiting younger star (2021, February 17)
retrieved 17 February 2021
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