ExEP: TOI-1231 b: A temperate sub-Neptune transiting the nearby M3 dwarf NLTT 24399 ...
We report the discovery of a transiting, temperate, sub-Neptune exoplanet orbiting TOI-1231(NLTT 24399, L 248-27, 2MASS J10265947-5228099), a nearby M3V star (d= 27.6 pc). The planet was detected using photometric data from theTransiting Exoplanet Survey Satellite and followed up with observations f...
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2023
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| Online Access: | https://dx.doi.org/10.48577/jpl.m8zpzj https://dataverse.jpl.nasa.gov/citation?persistentId=doi:10.48577/jpl.M8ZPZJ |
| Summary: | We report the discovery of a transiting, temperate, sub-Neptune exoplanet orbiting TOI-1231(NLTT 24399, L 248-27, 2MASS J10265947-5228099), a nearby M3V star (d= 27.6 pc). The planet was detected using photometric data from theTransiting Exoplanet Survey Satellite and followed up with observations from the Las Cumbres Observatory and the Antarctica Search for Transiting Ex-oPlanets program. Combining the photometric data sets, we find that the newly discovered planet has a radius of 3.68+0.20−0.19R⊕, and an orbital period of 24.246 days. Radial velocity measurements using the Planet Finder Spectrograph on the Magellan Clay telescope confirm the existence of the planet and lead to a mass measurement of 15.1+3.1−3.2M⊕. With an equilibrium temperature of just336K and a Transmission Spectroscopy Metric of 102, TOI-1231 b is one of the coolest small planets accessible for atmospheric studies thus far, and its host star’s bright NIR brightness (J=8.88, Ks=8.07)make it an exciting target for HST and JWST. Future ... |
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