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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole
Monthly Notices of the Royal Astronomical Society, Volume 527, No. 1, Year 2024
Notification
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Description
A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on the discovery and validation of TOI-715 b, a Rb = 1.55 ± 0.06R planet orbiting its nearby (42 pc) M4 host (TOI-715/TIC 271971130) with a period Pb = 19.288004+−00000024000027 d. TOI-715 b was first identified by TESS and validated using ground-based photometry, high-resolution imaging and statistical validation. The planet’s orbital period combined with the stellar effective temperature Teff = 3075 ± 75 K give this planet an installation Sb = 0.67+−002015 S, placing it within the most conservative definitions of the habitable zone for rocky planets. TOI-715 b’s radius falls exactly between two measured locations of the M-dwarf radius valley; characterizing its mass and composition will help understand the true nature of the radius valley for low-mass stars. We demonstrate TOI-715 b is amenable for characterization using precise radial velocities and transmission spectroscopy. Additionally, we reveal a second candidate planet in the system, TIC 271971130.02, with a potential orbital period of P02 = 25.60712+−000003600031 d and a radius of R02 = 1.066 ± 0.092 R, just inside the outer boundary of the habitable zone, and near a 4:3 orbital period commensurability. Should this second planet be confirmed, it would represent the smallest habitable zone planet discovered by TESS to date. © 2023 The Author(s).
Authors & Co-Authors
Dransfield, Georgina
United Kingdom, Birmingham
University of Birmingham
Timmermans, Mathilde
Belgium, Liege
Université de Liège
Triaud, Amaury H.M.J.
United Kingdom, Birmingham
University of Birmingham
Devora-Pajares, Martín
Spain, Granada
Universidad de Granada
Aganze, Christian
United States, La Jolla
University of California, San Diego
Barkaoui, Khalid
Belgium, Liege
Université de Liège
United States, Cambridge
Massachusetts Institute of Technology
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Burgasser, Adam J.
United States, La Jolla
University of California, San Diego
Collins, Karen A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Cointepas, Marion
France, Saint Martin D'heres
Université Grenoble Alpes
Switzerland, Geneva
Université de Genève
Ducrot, Elsa
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Günther, Maximilian N.
Netherlands, Noordwijk Aan Zee
Estec - European Space Research and Technology Centre
Howell, Steve B.
United States, Moffett Field
Nasa Ames Research Center
Murray, Catriona Anne
United States, Boulder
Planetary Solutions, Inc.
Niraula, Prajwal
United States, Cambridge
Massachusetts Institute of Technology
Rackham, Benjamin V.
United States, Cambridge
Massachusetts Institute of Technology
Sebastian, Daniel
United Kingdom, Birmingham
University of Birmingham
Stassun, Keivan G.
United States, Nashville
Vanderbilt University
Zúñiga-Fernández, Sebastian
Belgium, Liege
Université de Liège
Almenara, José Manuel
France, Saint Martin D'heres
Université Grenoble Alpes
Bonfils, Xavier
France, Saint Martin D'heres
Université Grenoble Alpes
Bouchy, François
Switzerland, Geneva
Université de Genève
Burke, Christopher J.
United States, Cambridge
Massachusetts Institute of Technology
Charbonneau, David B.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Christiansen, Jessie L.
United States, Pasadena
California Institute of Technology
Delrez, Laetitia
Belgium, Liege
Université de Liège
Gan, Tianjun
China, Beijing
Tsinghua University
García, Lionel J.
Belgium, Liege
Université de Liège
Gillon, Michaël
Belgium, Liege
Université de Liège
Hesse, Katharine M.
United States, Cambridge
Massachusetts Institute of Technology
Hooton, Matthew J.
United Kingdom, Cambridge
Department of Physics
Isopi, Giovanni
Italy, Guarcino
Regione Lazio
Jehin, Emmanuël
Belgium, Liege
Université de Liège
Jenkins, Jon M.
United States, Moffett Field
Nasa Ames Research Center
Latham, David W.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Mallia, Franco
Italy, Guarcino
Regione Lazio
Murgas, Felipe
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
France, Saint Martin D'heres
Université Grenoble Alpes
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Pedersen, Peter Pihlmann
United Kingdom, Cambridge
Department of Physics
Pozuelos, Francisco J.
Belgium, Liege
Université de Liège
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Queloz, Didier P.
United Kingdom, Cambridge
Department of Physics
Rodriguez, David R.
United States, Baltimore
Space Telescope Science Institute
Schanche, Nicole E.
China, Beijing
Tsinghua University
Switzerland, Bern
University of Bern
United States, College Park
University of Maryland, College Park
Seager, Sara
United States, La Jolla
University of California, San Diego
Spain, San Cristobal de la Laguna
Universidad de la Laguna
United States, Cambridge
Massachusetts Institute of Technology
Srdoč, Gregor
United States, Greenbelt
Nasa Goddard Space Flight Center
Stockdale, Chris J.
Croatia, Viskovo
Kotizarovci Observatory
Twicken, Joseph D.
United States, Moffett Field
Nasa Ames Research Center
United States, Mountain View
Seti Institute
Vanderspek, Roland K.
United States, Cambridge
Massachusetts Institute of Technology
Wells, Robert D.
Switzerland, Bern
University of Bern
Winn, Joshua N.
United States, Princeton
Princeton University
de Wit, Julien
United States, Cambridge
Massachusetts Institute of Technology
Statistics
Citations: 1
Authors: 49
Affiliations: 28
Identifiers
Doi:
10.1093/mnras/stad1439
ISSN:
00358711