TOI-1231 b: A Temperate, Neptune-sized Planet Transiting the Nearby M3 Dwarf NLTT 24399
Article
Article Title | TOI-1231 b: A Temperate, Neptune-sized Planet Transiting the Nearby M3 Dwarf NLTT 24399 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Burt, Jennifer A. (Author), Dragomir, Diana (Author), Molliere, Paul (Author), Youngblood, Allison (Author), Munoz, Antonio Garcia (Author), McCann, John (Author), Kreidberg, Laura (Author), Huang, Chelsea X. (Author), Collins, Karen A. (Author), Eastman, Jason D. (Author), Abe, Lyu (Author), Almenara, Jose M. (Author), Crossfield, Ian J. M. (Author), Ziegler, Carl (Author), Rodriguez, Joseph E. (Author), Mamajek, Eric E. (Author), Stassun, Keivan G. (Author), Halverson, Samuel P. (Author), Villanueva, Steven (Author), Butler, R. Paul (Author), Wang, Sharon Xuesong (Author), Schwarz, Richard P. (Author), Ricker, George R. (Author), Vanderspek, Roland (Author), Latham, David W. (Author), Seager, S. (Author), Winn, Joshua N. (Author), Jenkins, Jon M. (Author), Agabi, Abdelkrim (Author), Bonfils, Xavier (Author), Ciardi, David (Author), Cointepas, Marion (Author), Crane, Jeffrey D. (Author), Crouzet, Nicolas (Author), Dransfield, Georgina (Author), Feng, Fabo (Author), Furlan, Elise (Author), Guillot, Tristan (Author), Gupta, Arvind F. (Author), Howell, Steve B. (Author), Jensen, Eric L. N. (Author), Law, Nicholas (Author), Mann, Andrew W. (Author), Marie-Sainte, Wenceslas (Author), Matson, Rachel A. (Author), Matthews, Elisabeth C. (Author), Mekarnia, Djamel (Author), Pepper, Joshua (Author), Scott, Nic (Author), Shectman, Stephen A. (Author), Schlieder, Joshua E. (Author), Schmider, Francois-Xavier (Author), Stevens, Daniel J. (Author), Teske, Johanna K. (Author), Triaud, Amaury H. M. J. (Author), Charbonneau, David (Author), Berta-Thompson, Zachory K. (Author), Burke, Christopher J. (Author), Daylan, Tansu (Author), Barclay, Thomas (Author), Wohler, Bill (Author) and Brasseur, C. E. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 162 (3), pp. 1-15 |
Article Number | 87 |
Number of Pages | 15 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac0432 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac0432 |
Abstract | We report the discovery of a transiting, temperate, Neptune-sized exoplanet orbiting the nearby (d = 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}_{-0.15}^{+0.16}\,{R}_{\oplus } 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 15.5 3.3 M ⊕. With an equilibrium temperature of just 330 K, TOI-1231 b is one of the coolest small planets accessible for atmospheric studies thus far, and its host star's bright near-infrared brightness (J = 8.88, Ks = 8.07) makes it an exciting target for the Hubble Space Telescope and the James Webb Space Telescope. Future atmospheric observations would enable the first comparative planetology efforts in the 250-350 K temperature regime via comparisons with K2-18 b. Furthermore, TOI-1231's high systemic radial velocity (70.5 km s-1) may allow for the detection of low-velocity hydrogen atoms escaping the planet by Doppler, shifting the H i Lyα stellar emission away from the geocoronal and interstellar medium absorption features. |
Keywords | Exoplanet astronomy (486); Transit photometry (1709); Radial velocity (1332); Mini Neptunes (1063); Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | California Institute of Technology (Caltech), United States |
University of New Mexico, United States | |
Max Planck Society, Germany | |
University of Colorado Boulder, United States | |
University of Paris, France | |
University of California, United States | |
Massachusetts Institute of Technology, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Cote d'Azur University, France | |
Grenoble Alpes University, France | |
University of Kansas, United States | |
University of Toronto, Canada | |
Michigan State University, United States | |
Vanderbilt University, United States | |
Carnegie Institution of Washington, United States | |
Patashnick Voorheesville Observatory, United States | |
Princeton University, United States | |
NASA Ames Research Center, United States | |
National Aeronautics and Space Administration (NASA), United States | |
European Space Agency, France | |
University of Birmingham, United Kingdom | |
Shanghai Jiao Tong University, China | |
Pennsylvania State University, United States | |
Swarthmore College, United States | |
University of North Carolina, United States | |
Concordia Station, Antarctica | |
United States Naval Observatory, United States | |
University of Geneva, Switzerland | |
Lehigh University, United States | |
NASA Goddard Space Flight Center, United States | |
Space Telescope Science Institute, United States |
https://research.usq.edu.au/item/q7269/toi-1231-b-a-temperate-neptune-sized-planet-transiting-the-nearby-m3-dwarf-nltt-24399
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