TOI-1231 b: A Temperate, Neptune-Sized Planet Transiting the Nearby M3 Dwarf NLTT 24399
Jennifer A. Burt, Diana Dragomir, Paul Molli\`ere, Allison Youngblood,, Antonio Garc\'ia Mu\~noz, John McCann, Laura Kreidberg, Chelsea X. Huang,, Karen A. Collins, Jason D. Eastman, Lyu Abe, Jose M. Almenara, Ian J. M., Crossfield, Carl Ziegler, Joseph E. Rodriguez

TL;DR
This paper reports the discovery and characterization of TOI-1231 b, a temperate, Neptune-sized exoplanet orbiting a nearby M3 dwarf, highlighting its potential for atmospheric studies and atmospheric escape detection.
Contribution
The discovery of a temperate, Neptune-sized exoplanet around a nearby M3 dwarf with detailed mass, radius, and temperature measurements, and its suitability for atmospheric characterization.
Findings
Planet radius: 3.65 R_⊕
Orbital period: 24.246 days
Equilibrium temperature: 330K
Abstract
We report the discovery of a transiting, temperate, Neptune-sized exoplanet orbiting the nearby ( = 27.5 pc), M3V star TOI-1231 (NLTT 24399, L 248-27, 2MASS J10265947-5228099). The planet was detected using photometric data from the Transiting Exoplanet Survey Satellite and followed up with observations from the Las Cumbres Observatory and the Antarctica Search for Transiting ExoPlanets program. Combining the photometric data sets, we find that the newly discovered planet has a radius of 3.65 R, and an orbital period of 24.246 days. Radial velocity measurements obtained with the Planet Finder Spectrograph on the Magellan Clay telescope confirm the existence of the planet and lead to a mass measurement of 15.53.3 M. With an equilibrium temperature of just 330K TOI-1231 b is one of the coolest small planets accessible for atmospheric studies…
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