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Journal Articles Nature Astronomy Year : 2020

Age dating of an early Milky Way merger via asteroseismology of the naked-eye star ν Indi

William Chaplin (1) , Aldo Serenelli (2) , Andrea Miglio (3) , Thierry Morel (4) , J. Ted Mackereth , Fiorenzo Vincenzo , Hans Kjeldsen (5) , Sarbani Basu (6) , Warrick Ball , Amalie Stokholm , Kuldeep Verma (7) , Jakob Rørsted Mosumgaard , Victor Silva Aguirre (8) , Anwesh Mazumdar , Pritesh Ranadive , H. Antia , Yveline Lebreton (9, 10) , Joel Ong , Thierry Appourchaux (11) , Timothy R Bedding (12) , Jørgen Christensen-Dalsgaard (5) , Orlagh Creevey (13) , Rafael Garcia (14) , Rasmus Handberg (15) , Daniel Huber (12) , Steven Kawaler (16) , Mikkel Lund , Travis Metcalfe , Keivan Stassun , Michaël Bazot (5) , Paul Beck , Keaton Bell , Maria Bergemann , Derek Buzasi , Othman Benomar , Diego Bossini , Lisa Bugnet , Tiago Campante , Zeynep Çelik Orhan , Enrico Corsaro (17) , Lucía González-Cuesta , Guy Davies , Maria Pia Di Mauro (18) , Ricky Egeland , Yvonne Elsworth (3) , Patrick Gaulme (19) , Hamed Ghasemi , Zhao Guo , Oliver Hall , Amir Hasanzadeh , Saskia Hekker (3) , Rachel Howe , Jon Jenkins (20) , Antonio Antonio.Jimenez@car.Upm-Csic.Es Jiménez (21) , René Kiefer (22) , James D Kuszlewicz (23) , Thomas Kallinger (24) , David Latham , Mia Lundkvist , Savita Mathur (25) , Josefina Montalbán (26) , Benoit Mosser (10) , Andres Moya Bedón , Martin Bo Nielsen , Sibel Örtel , Ben Rendle , George R. Ricker (27) , Thaíse Rodrigues , Ian Roxburgh , Hossein Safari , Mathew Schofield , Sara Seager , Barry Smalley , Dennis Stello (12) , Róbert Szabó (28) , Jamie Tayar (29) , Nathalie Themessl , Alexandra Thomas , Roland Vanderspek , Walter van Rossem , Mathieu Vrard (30) , Achim Weiss (8) , Timothy White , Joshua Winn , Mutlu Yildiz
1 Department of Psychology
2 ICE-CSIC - Institute of Space Sciences [Barcelona]
3 School of Physics and Astronomy
4 CERFACS - Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique
5 DASC - Danish AsteroSeismology Centre
6 Department of Astronomy [New Haven]
7 Aarhus University [Aarhus]
8 MPA - Max-Planck-Institut für Astrophysik
9 IPR - Institut de Physique de Rennes
10 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
11 IAS - Institut d'astrophysique spatiale
12 SIfA - Sydney Institute for Astronomy
13 LAGRANGE - Joseph Louis LAGRANGE
14 VICOROB - Research institute of Computer Vision and Robotics [Girona]
15 Department of Physics and Astronomy [Aarhus]
16 Department of Physics and Astronomy [Iowa City]
17 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
18 IASF-Roma - Istituto di Astrofisica Spaziale e Fisica cosmica - Roma
19 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
20 ARC - NASA Ames Research Center
21 CAR - Centre for Automation and Robotics
22 KIS - Kiepenheuer-Institut für Sonnenphysik
23 SAC - Stellar Astrophysics Centre [Aarhus]
24 Instituut voor Sterrenkunde [Leuven]
25 HAO - High Altitude Observatory
26 Département des Sciences et Gestion de l'Environnement/Océanologie [Liège]
27 CSR - Center for Space Research [Cambridge]
28 High Speed Networks Laboratory, Dept. of Telecommunications and Media Informatics
29 Ohio State University - Department of Astronomy
30 Observatoire de Paris
William Chaplin
  • Function : Author
  • PersonId : 943470
Andrea Miglio
J. Ted Mackereth
  • Function : Author
Fiorenzo Vincenzo
  • Function : Author
Warrick Ball
Amalie Stokholm
Jakob Rørsted Mosumgaard
  • Function : Author
Anwesh Mazumdar
  • Function : Author
Pritesh Ranadive
  • Function : Author
H. Antia
  • Function : Author
Joel Ong
  • Function : Author
Orlagh Creevey
Daniel Huber
Mikkel Lund
  • Function : Author
Travis Metcalfe
  • Function : Author
Keivan Stassun
Paul Beck
  • Function : Author
Keaton Bell
  • Function : Author
Maria Bergemann
  • Function : Author
Derek Buzasi
  • Function : Author
Othman Benomar
  • Function : Author
Diego Bossini
  • Function : Author
Lisa Bugnet
  • Function : Author
Tiago Campante
  • Function : Author
Zeynep Çelik Orhan
  • Function : Author
Lucía González-Cuesta
  • Function : Author
Guy Davies
  • Function : Author
Ricky Egeland
  • Function : Author
Hamed Ghasemi
  • Function : Author
Zhao Guo
  • Function : Author
Oliver Hall
  • Function : Author
Amir Hasanzadeh
  • Function : Author
Saskia Hekker
Rachel Howe
  • Function : Author
Jon Jenkins
David Latham
Mia Lundkvist
  • Function : Author
Andres Moya Bedón
  • Function : Author
Martin Bo Nielsen
  • Function : Author
Sibel Örtel
  • Function : Author
Ben Rendle
  • Function : Author
Thaíse Rodrigues
  • Function : Author
Ian Roxburgh
  • Function : Author
Hossein Safari
  • Function : Author
Mathew Schofield
  • Function : Author
Sara Seager
Barry Smalley
  • Function : Author
Dennis Stello
Jamie Tayar
Nathalie Themessl
  • Function : Author
Alexandra Thomas
  • Function : Author
Roland Vanderspek
Walter van Rossem
  • Function : Author
Timothy White
Joshua Winn
Mutlu Yildiz
  • Function : Author

Abstract

Over the course of its history, the Milky Way has ingested multiple smaller satellite galaxies1. Although these accreted stellar populations can be forensically identified as kinematically distinct structures within the Galaxy, it is difficult in general to date precisely the age at which any one merger occurred. Recent results have revealed a population of stars that were accreted via the collision of a dwarf galaxy, called Gaia-Enceladus1, leading to substantial pollution of the chemical and dynamical properties of the Milky Way. Here we identify the very bright, naked-eye star ν Indi as an indicator of the age of the early in situ population of the Galaxy. We combine asteroseismic, spectroscopic, astrometric and kinematic observations to show that this metal-poor, alpha-element-rich star was an indigenous member of the halo, and we measure its age to be 11.0 ±0.7 ? (stat) ±0.8 ? (sys) billion years. The star bears hallmarks consistent with having been kinematically heated by the Gaia-Enceladus collision. Its age implies that the earliest the merger could have begun was 11.6 and 13.2 billion years ago, at 68% and 95% confidence, respectively. Computations based on hierarchical cosmological models slightly reduce the above limits.
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Dates and versions

obspm-02440136 , version 1 (19-01-2021)

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William Chaplin, Aldo Serenelli, Andrea Miglio, Thierry Morel, J. Ted Mackereth, et al.. Age dating of an early Milky Way merger via asteroseismology of the naked-eye star ν Indi. Nature Astronomy, 2020, 4 (4), pp.382-389. ⟨10.1038/s41550-019-0975-9⟩. ⟨obspm-02440136⟩
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