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PLATO as it is: a legacy mission for Galactic archaeology

Miglio, A and Chiappini, C and Mosser, B and Davies, GR and Freeman, K and Girardi, L and Jofre, P and Kawata, D and Rendle, BM and Valentini, M and Casagrande, L and Chaplin, WJ and Gilmore, G and Hawkins, K and Holl, B and Appourchaux, T and Belkacem, K and Bossini, D and Brogaard, K and Goupil, M-J and Montalban, J and Noels, A and Anders, F and Rodrigues, T and Piotto, G and Pollacco, D and Rauer, H and Prieto, CA and Avelino, PP and Babusiaux, C and Barban, C and Barbuy, B and Basu, S and Baudin, F and Benomar, O and Bienayme, O and Binney, J and Bland-Hawthorn, J and Bressan, A and Cacciari, C and Campante, TL and Cassisi, S and Christensen-Dalsgaard, J and Combes, F and Creevey, O and Cunha, MS and Jong, RSD and Laverny, PD and Degl'Innocenti, S and Deheuvels, S and Depagne, E and DeRidder, J and DiMatteo, P and Mauro, MPD and Dupret, M-A and Eggenberger, P and Elsworth, Y and Famaey, B and Feltzing, S and Garcia, RA and Gerhard, O and Gibson, BK and Gizon, L and Haywood, M and Handberg, R and Heiter, U and Hekker, S and Huber, D and Ibata, R and Katz, D and Kawaler, SD and Kjeldsen, H and Kurtz, DW and Lagarde, N and Lebreton, Y and Lund, MN and Majewski, SR and Marigo, P and Martig, M and Mathur, S and Minchev, I and Morel, T and Ortolani, S and Pinsonneault, MH and Plez, B and Moroni, PGP and Pricopi, D and Recio-Blanco, A and Reyle, C and Robin, A and Roxburgh, IW and Salaris, M and Santiago, BX and Schiavon, RP and Serenelli, A and Sharma, S and Aguirre, VS and Soubiran, C and Steinmetz, M and Stello, D and Strassmeier, KG and Ventura, P and Ventura, R and Walton, NA and Worley, CC (2017) PLATO as it is: a legacy mission for Galactic archaeology. Astronomische Nachrichten, 338 (6). pp. 644-661. ISSN 0004-6337

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Abstract

Deciphering the assembly history of the Milky Way is a formidable task, which becomes possible only if one can produce high-resolution chrono-chemo-kinematical maps of the Galaxy. Data from large-scale astrometric and spectroscopic surveys will soon provide us with a well-defined view of the current chemo-kinematical structure of the Milky Way, but will only enable a blurred view on the temporal sequence that led to the present-day Galaxy. As demonstrated by the (ongoing) exploitation of data from the pioneering photometric missions CoRoT, Kepler, and K2, asteroseismology provides the way forward: solar-like oscillating giants are excellent evolutionary clocks thanks to the availability of seismic constraints on their mass and to the tight age-initial-mass relation they adhere to. In this paper we identify five key outstanding questions relating to the formation and evolution of the Milky Way that will need precise and accurate ages for large samples of stars to be addressed, and we identify the requirements in terms of number of targets and the precision on the stellar properties that are needed to tackle such questions. By quantifying the asteroseismic yields expected from PLATO for red-giant stars, we demonstrate that these requirements are within the capabilities of the current instrument design, provided that observations are sufficiently long to identify the evolutionary state and allow robust and precise determination of acoustic-mode frequencies. This will allow us to harvest data of sufficient quality to reach a 10% precision in age. This is a fundamental pre-requisite to then reach the more ambitious goal of a similar level of accuracy, which will only be possible if we have to hand a careful appraisal of systematic uncertainties on age deriving from our limited understanding of stellar physics, a goal which conveniently falls within the main aims of PLATO's core science.

Item Type: Article
Additional Information: This is the accepted version of the following article: Miglo A, Chiappini C, Mosser B, et al. PLATO as it is: a legacy mission for Galactic archaeology. Astron. Nachr. / AN. 2017;338:644–661. https://doi.org/10.1002/asna.201713385, which has been published in final form at http://dx.doi.org/10.1002/asna.201713385
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Wiley
Related URLs:
Date Deposited: 28 Jun 2017 10:33
Last Modified: 10 Sep 2017 10:18
DOI or Identification number: 10.1002/asna.201713385
URI: http://researchonline.ljmu.ac.uk/id/eprint/6763

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