Planet Hunters TESS. V. A Planetary System Around a Binary Star, Including a Mini-Neptune in the Habitable Zone
Author:
Eisner Nora L.ORCID, Grunblatt Samuel K.ORCID, Barragán OscarORCID, Faridani Thea H.ORCID, Lintott ChrisORCID, Aigrain SuzanneORCID, Johnston ColeORCID, Mason Ian R., Stassun Keivan G.ORCID, Bedell MeganORCID, Boyle Andrew W.ORCID, Ciardi David R.ORCID, Clark Catherine A.ORCID, Hebrard Guillaume, Hogg David W.ORCID, Howell Steve B.ORCID, Klein Baptiste, Llama JoeORCID, Winn Joshua N.ORCID, Zhao Lily L.ORCID, Murphy Joseph M. AkanaORCID, Beard CoreyORCID, Brinkman Casey L.ORCID, Chontos AshleyORCID, Cortes-Zuleta PiaORCID, Delfosse Xavier, Giacalone StevenORCID, Gilbert Emily A.ORCID, Heidari Neda, Holcomb RaeORCID, Jenkins Jon M.ORCID, Kiefer FlavienORCID, Lubin JackORCID, Martioli EderORCID, Polanski Alex S.ORCID, Saunders NicholasORCID, Seager SaraORCID, Shporer AviORCID, Tyler DakotahORCID, Van Zandt JudahORCID, Alhassan Safaa, Amratlal Daval J.ORCID, Antonel Lais I., Bentzen Simon L. S., Bosch Milton K. DORCID, Bundy David, Chitsiga Itayi, Delaunay Jérôme F., Doisy Xavier, Ferstenou Richard, Fynø Mark, Geary James M., Haynaly Gerry, Hermes Pete, Huten Marc, Lee Sam, Metcalfe Paul, Pennell Garry J., Puszkarska Joanna, Schäfer Thomas, Stiller LisaORCID, Tanner Christopher, Tarr Allan, Wilkinson Andrew
Abstract
Abstract
We report on the discovery and validation of a transiting long-period mini-Neptune orbiting a bright (V = 9.0 mag) G dwarf (TOI 4633; R = 1.05 R
⊙, M = 1.10 M
⊙). The planet was identified in data from the Transiting Exoplanet Survey Satellite by citizen scientists taking part in the Planet Hunters TESS project. Modelling of the transit events yields an orbital period of 271.9445 ± 0.0040 days and radius of 3.2 ± 0.20 R
⊕. The Earth-like orbital period and an incident flux of
1.56
−
0.16
+
0.20
F
⊕ places it in the optimistic habitable zone around the star. Doppler spectroscopy of the system allowed us to place an upper mass limit on the transiting planet and revealed a non-transiting planet candidate in the system with a period of 34.15 ± 0.15 days. Furthermore, the combination of archival data dating back to 1905 with new high angular resolution imaging revealed a stellar companion orbiting the primary star with an orbital period of around 230 yr and an eccentricity of about 0.9. The long period of the transiting planet, combined with the high eccentricity and close approach of the companion star makes this a valuable system for testing the formation and stability of planets in binary systems.
Funder
Brinson Foundation Blanche Davis Moore Foundation NASA ∣ Aeronautics Research Mission Directorate NASA Exoplanet Science Institute National Science Foundation NASA ∣ NASA Astrobiology Institute EC ∣ European Research Council Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Publisher
American Astronomical Society
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