TOI-1231 b: A Temperate, Neptune-sized Planet Transiting the Nearby M3 Dwarf NLTT 24399

Public Deposited
Analytics

Downloadable Content

Download PDF
Request Version for Screen Reader
Creator
  • Burt, J.A.
    • Other Affiliation: California Institute of Technology
  • Dragomir, D.
    • Other Affiliation: University of New Mexico
  • Mollire, P.
    • Other Affiliation: Max-Planck-Institut für Astronomie
  • Youngblood, A.
    • Other Affiliation: Laboratory for Atmospheric and Space Physics
  • García Muñoz, A.
    • Other Affiliation: Université de Paris
  • McCann, J.
    • Other Affiliation: University of California, Santa Barbara
  • Kreidberg, L.
    • Other Affiliation: Max-Planck-Institut für Astronomie
  • Huang, C.X.
    • Other Affiliation: Massachusetts Institute of Technology
  • Collins, K.A.
    • Other Affiliation: Harvard and Smithsonian
  • Eastman, J.D.
    • Other Affiliation: Harvard and Smithsonian
  • Abe, L.
    • Other Affiliation: Université Côte d'Azur
  • Almenara, J.M.
    • Other Affiliation: Univ. Grenoble Alpes
  • Crossfield, I.J.M.
    • Other Affiliation: University of Kansas
  • Ziegler, C.
    • Other Affiliation: University of Toronto
  • Rodriguez, J.E.
    • Other Affiliation: Michigan State University
  • Mamajek, E.E.
    • Other Affiliation: California Institute of Technology
  • Stassun, K.G.
    • Other Affiliation: Vanderbilt University
  • Halverson, S.P.
    • Other Affiliation: California Institute of Technology
  • Villanueva, S.
    • Other Affiliation: Massachusetts Institute of Technology
  • Butler, R.P.
    • Other Affiliation: Carnegie Institution for Science
  • Wang, S.X.
    • Other Affiliation: Tsinghua University
  • Schwarz, R.P.
    • Other Affiliation: Patashnick Voorheesville Observatory
  • Ricker, G.R.
    • Other Affiliation: Massachusetts Institute of Technology
  • Vanderspek, R.
    • Other Affiliation: Massachusetts Institute of Technology
  • Latham, D.W.
    • Other Affiliation: Harvard and Smithsonian
  • Seager, S.
    • Other Affiliation: Massachusetts Institute of Technology
  • Winn, J.N.
    • Other Affiliation: Princeton University
  • Jenkins, J.M.
    • Other Affiliation: NASA Ames Research Center
  • Agabi, A.
    • Other Affiliation: Université Côte d'Azur
  • Bonfils, X.
    • Other Affiliation: Univ. Grenoble Alpes
  • Ciardi, D.
    • Other Affiliation: California Institute of Technology
  • Cointepas, M.
    • Other Affiliation: Univ. Grenoble Alpes
  • Crane, J.D.
    • Other Affiliation: Carnegie Institution for Science
  • Crouzet, N.
    • Other Affiliation: European Space Agency
  • Dransfield, G.
    • Other Affiliation: University of Birmingham
  • Feng, F.
    • Other Affiliation: Shanghai Jiao Tong University
  • Furlan, E.
    • Other Affiliation: California Institute of Technology
  • Guillot, T.
    • Other Affiliation: Université Côte d'Azur
  • Gupta, A.F.
    • Other Affiliation: Pennsylvania State University
  • Howell, S.B.
    • Other Affiliation: NASA Ames Research Center
  • Jensen, E.L.N.
    • Other Affiliation: Swarthmore College
  • Law, N.
    • Affiliation: College of Arts and Sciences, Department of Physics and Astronomy
  • Mann, A.W.
    • Affiliation: College of Arts and Sciences, Department of Physics and Astronomy
  • Marie-Sainte, W.
    • Other Affiliation: IPEV/PNRA
  • Matson, R.A.
    • Other Affiliation: U.S. Naval Observatory
  • Matthews, E.C.
    • Other Affiliation: Observatoire de l'Université de Genéve
  • Mékarnia, D.
    • Other Affiliation: Université Côte d'Azur
  • Pepper, J.
    • Other Affiliation: Lehigh University
  • Scott, N.
    • Other Affiliation: NASA Ames Research Center
  • Shectman, S.A.
    • Other Affiliation: Carnegie Institution for Science
  • Schlieder, J.E.
    • Other Affiliation: NASA Goddard Space Flight Center
  • Schmider, F.-X.
    • Other Affiliation: Université Côte d'Azur
  • Stevens, D.J.
    • Other Affiliation: Pennsylvania State University
  • Teske, J.K.
    • Other Affiliation: Carnegie Institution for Science
  • Triaud, A.H.M.J.
    • Other Affiliation: University of Birmingham
  • Charbonneau, D.
    • Other Affiliation: Harvard and Smithsonian
  • Berta-Thompson, Z.K.
    • Other Affiliation: University of Colorado Boulder
  • Burke, C.J.
    • Other Affiliation: Massachusetts Institute of Technology
  • Daylan, T.
    • Other Affiliation: Massachusetts Institute of Technology
  • Barclay, T.
    • Other Affiliation: University of Maryland, Baltimore County
  • Wohler, B.
    • Other Affiliation: NASA Ames Research Center
  • Brasseur, C.E.
    • Other Affiliation: Space Telescope Science Institute
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.
Date of publication
DOI
Identifier
Resource type
  • Article
Rights statement
  • In Copyright
Journal title
  • Astronomical Journal
Journal volume
  • 162
Journal issue
  • 3
Language
  • English
Version
  • Publisher
ISSN
  • 0004-6256
Publisher
  • American Astronomical Society

Relations

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Burt_2021_AJ_162_87.pdf 2022-12-01 Public Download