The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf
We report the discovery of the Oceanus moving group, a ≈500 Myr old group with 50 members and candidate members at distances 2–50 pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57–5319...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acb8b7 |
| _version_ | 1797701424651436032 |
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| author | Jonathan Gagné Leslie Moranta Jacqueline K. Faherty Rocio Kiman Dominic Couture Arnaud René Larochelle Mark Popinchalk Daniella Morrone |
| author_facet | Jonathan Gagné Leslie Moranta Jacqueline K. Faherty Rocio Kiman Dominic Couture Arnaud René Larochelle Mark Popinchalk Daniella Morrone |
| author_sort | Jonathan Gagné |
| collection | DOAJ |
| description | We report the discovery of the Oceanus moving group, a ≈500 Myr old group with 50 members and candidate members at distances 2–50 pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57–531906.1 AB (Luhman 16 AB) at a distance of 2 pc, which was previously suspected to be young (600–800 Myr) based on a comparison of its dynamical mass measurements with brown dwarf evolutionary models. We use empirical color–magnitude sequences, stellar activity, and gyrochronology to determine that this new group is roughly coeval with the Coma Ber open cluster, with an isochronal age of 510 ± 95 Myr. This newly discovered group will be useful to refine the age and chemical composition of Luhman 16 AB, which is already one of the best substellar benchmarks known to date. Furthermore, the Oceanus moving group is one of the nearest young moving groups identified to date, making it a valuable laboratory for the study of exoplanets and substellar members, with eight brown dwarf candidate members already identified here. |
| first_indexed | 2024-03-12T04:36:30Z |
| format | Article |
| id | doaj.art-e0531fd8d5c647859822234610cc40cc |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:36:30Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-e0531fd8d5c647859822234610cc40cc2023-09-03T09:56:16ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01945211910.3847/1538-4357/acb8b7The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown DwarfJonathan Gagné0https://orcid.org/0000-0002-2592-9612Leslie Moranta1https://orcid.org/0000-0001-7171-5538Jacqueline K. Faherty2https://orcid.org/0000-0001-6251-0573Rocio Kiman3https://orcid.org/0000-0003-2102-3159Dominic Couture4https://orcid.org/0000-0003-2604-3255Arnaud René Larochelle5https://orcid.org/0000-0002-3499-2998Mark Popinchalk6https://orcid.org/0000-0001-9482-7794Daniella Morrone7https://orcid.org/0000-0002-1169-1834Planétarium Rio Tinto Alcan , Espace pour la Vie, 4801 av. Pierre-de Coubertin, Montréal, Québec, Canada ; gagne@astro.umontreal.ca; Institute for Research on Exoplanets, Université de Montréal , Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, CanadaPlanétarium Rio Tinto Alcan , Espace pour la Vie, 4801 av. Pierre-de Coubertin, Montréal, Québec, Canada ; gagne@astro.umontreal.ca; Institute for Research on Exoplanets, Université de Montréal , Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, CanadaDepartment of Astrophysics , American Museum of Natural History, Central Park West at 79th St., New York, NY 10024, USAKavli Institute for Theoretical Physics, University of California , Santa Barbara, CA 93106, USAPlanétarium Rio Tinto Alcan , Espace pour la Vie, 4801 av. Pierre-de Coubertin, Montréal, Québec, Canada ; gagne@astro.umontreal.ca; Institute for Research on Exoplanets, Université de Montréal , Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, CanadaPlanétarium Rio Tinto Alcan , Espace pour la Vie, 4801 av. Pierre-de Coubertin, Montréal, Québec, Canada ; gagne@astro.umontreal.ca; Institute for Research on Exoplanets, Université de Montréal , Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, CanadaDepartment of Astrophysics , American Museum of Natural History, Central Park West at 79th St., New York, NY 10024, USA; Physics, The Graduate Center, City University of New York , New York, NY 10016, USA; Department of Physics and Astronomy, Hunter College, City University of New York , 695 Park Avenue, New York, NY 10065, USAPlanétarium Rio Tinto Alcan , Espace pour la Vie, 4801 av. Pierre-de Coubertin, Montréal, Québec, Canada ; gagne@astro.umontreal.ca; Institute for Research on Exoplanets, Université de Montréal , Département de Physique, C.P. 6128 Succ. Centre-ville, Montréal, QC H3C 3J7, CanadaWe report the discovery of the Oceanus moving group, a ≈500 Myr old group with 50 members and candidate members at distances 2–50 pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57–531906.1 AB (Luhman 16 AB) at a distance of 2 pc, which was previously suspected to be young (600–800 Myr) based on a comparison of its dynamical mass measurements with brown dwarf evolutionary models. We use empirical color–magnitude sequences, stellar activity, and gyrochronology to determine that this new group is roughly coeval with the Coma Ber open cluster, with an isochronal age of 510 ± 95 Myr. This newly discovered group will be useful to refine the age and chemical composition of Luhman 16 AB, which is already one of the best substellar benchmarks known to date. Furthermore, the Oceanus moving group is one of the nearest young moving groups identified to date, making it a valuable laboratory for the study of exoplanets and substellar members, with eight brown dwarf candidate members already identified here.https://doi.org/10.3847/1538-4357/acb8b7Stellar associationsOpen star clustersStellar kinematicsBrown dwarfs |
| spellingShingle | Jonathan Gagné Leslie Moranta Jacqueline K. Faherty Rocio Kiman Dominic Couture Arnaud René Larochelle Mark Popinchalk Daniella Morrone The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf The Astrophysical Journal Stellar associations Open star clusters Stellar kinematics Brown dwarfs |
| title | The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf |
| title_full | The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf |
| title_fullStr | The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf |
| title_full_unstemmed | The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf |
| title_short | The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf |
| title_sort | oceanus moving group a new 500 myr old host for the nearest brown dwarf |
| topic | Stellar associations Open star clusters Stellar kinematics Brown dwarfs |
| url | https://doi.org/10.3847/1538-4357/acb8b7 |
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