The Milky Way Assembly Tale - Plot and characters as of today, and what to expect in future editions



Via Piero Gobetti, 101, 40129 Bologna BO
Our knowledge of the Milky Way's assembly history has been revolutionised by the advent of the Gaia mission. Since the availability of kinematic information for more than 1 billion stars with Gaia DR2, the story of how our Galaxy was formed from the merger of smaller galaxies has begun to unravel. Gaia's handwriting has been supported by the combination of its dynamical information with chemical abundance and age measurements from spectroscopic (e.g. APOGEE, GALAH, GES, LAMOST, RAVE) and asteroseismic (e.g. CoRoT, Kepler, K2, TESS) surveys, which are now adding more detail to the plot. However, as the plot unravels, it becomes more and more complex. Observations and models need to move forward in tandem to support its evolution and uncover possible twists. Future large-scale spectroscopic surveys will greatly improve our chemical knowledge of the Milky Way's stellar populations and, together with future asteroseismic missions, will open the window to systematic determination of accurate stellar ages as a new ink to fuel the writing.
With the rapid pace at which the Milky Way assembly story is constantly being updated, the aim of this conference is to bring the community onto the same page, where the main characters, their characteristics and the timeline of their contribution are well established, and where the main observational and theoretical open questions for the continuation of the story are set out and discussed.

The topics to be covered at the conference are as follows
  • Substructures of the Milky Way halo, in the chemical-dynamical-chronological space;
  • Evolution of the Milky Way disk through the interplay with the assembling mergers;
  • Stellar age as a critical component - development of new methods to infer age with increased precision and accuracy and cosmological implications;
  • Predictions from simulations as a tool for interpreting the complex observational evidence;
  • The assembly history of the Local Group.


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  • Aakash Pandey
  • Adam Dillamore
  • Akshara Viswanathan
  • Alejandra Recio-Blanco
  • Alessandro Mazzi
  • Alessandro Spagna
  • Alessio Mucciarelli
  • Alex Billi
  • Alex Riley
  • Alice Mori
  • Alistair Walker
  • Amina Helmi
  • Andrea Miglio
  • Andrea Sante
  • Andreia Carrillo
  • Andrew Wetzel
  • Aneesh Naik
  • Angus Beane
  • Anke Ardern-Arentsen
  • Anna Barbara De Andrade Queiroz
  • Annette Ferguson
  • Annie Robin
  • Antonella Vallenari
  • Azadeh Fattahi-Savadjani
  • Boquan Chen
  • Bragaglia Angela
  • Bridget Ratcliffe
  • Callie Clontz
  • Camilla Giusti (Online)
  • Carlos Viscasillas Vazquez
  • Carme Gallart
  • Cecilia Mateu
  • Charis Tsakonas
  • Chervin Laporte
  • Chiara Crociati
  • Claudia Mendes De Oliveira
  • Cristiano Fanelli
  • Cristina Chiappini
  • Daisuke Kawata (Online)
  • Damla Gumus (Online)
  • Daniel Horta
  • David Aguado
  • David Martínez-Delgado
  • David Nataf
  • David Soderblom
  • Davide Massari
  • Deimer Antonio Alvarez Garay
  • Diane Feuillet
  • Edoardo Ceccarelli
  • Elisa Rita Garro
  • Elliot Davies
  • Eloisa Poggio (Online)
  • Else Starkenburg
  • Emanuela Luongo
  • Emily Cunningham
  • Emma Dodd
  • Emma Fernandez-Alvar
  • Eugene Vasiliev
  • Eugenio Carretta (Online)
  • Ewoud Wempe
  • Felipe Gran
  • Finn Pal
  • Francesca Annibali
  • Francesca Lucertini
  • Francisca Espinoza Rojas
  • Francois Hammer
  • Furkan Akbaba
  • Gail Zasowski
  • Gaël Buldgen
  • Georges Kordopatis
  • Georges Meynet
  • Giada Casali
  • Gisella Clementini
  • Giulia Pagnini
  • Giuseppina Battaglia
  • Govind Nandakumar
  • Guillaume Guiglion
  • Guillaume Thomas
  • Haifeng Wang (Online)
  • Hanneke Woudenberg
  • Hans-Walter Rix
  • Hanyuan Zhang
  • Ioannis Nektarios Kallimanis
  • Isaure Gonzales Rivera
  • Istiak Akib (Online)
  • Itsuki Ogami
  • Ivanna Escala
  • Jacob Nibauer
  • Jairo Andres Alzate Trujillo
  • Jason Hunt
  • Jeppe Sinkbaek Thomsen
  • Jessica Schonhut-Stasik
  • Joao Antonio Silveira Do Amarante
  • Josefina Montalban
  • Juan Nicolas Garavito Camargo
  • Julio A Carballo-Bello
  • Karsten Brogaard
  • Kathy Vivas
  • Keith Hawkins
  • Laia Casamiquela
  • Lanfranco Chiappino
  • Lapo Querci
  • Laura Magrini
  • Leda Berni
  • Lekshmi Thulasidharan
  • Lorenzo Briganti
  • Luca Sbordone
  • Léa Marques
  • Madeline Lucey
  • Manuel Bayer
  • Marc Del Alcazar I Julia
  • Marcel Pawlowski
  • Maria Benito
  • Maria Massineo
  • Maria Teresa Antoja Castelltort
  • Marie Barbillon
  • Marina Dal Ponte
  • Mario G Lattanzi
  • Mariya Nizovkina
  • Martina Loriga
  • Martina Rossi
  • Martynas Lauzikas (Online)
  • Marwan Gebran (Online)
  • Massimiliano Gatto
  • Massimiliano Matteuzzi
  • Matteo Monelli
  • Matthew Orkney
  • Mauro Cabrera (Online)
  • Micah Oeur
  • Michele Bellazzini
  • Michele Cignoni
  • Michele De Leo
  • Nadège Lagarde
  • Nagaraj Vernekar
  • Natsuki Funakoshi (Online)
  • Nicolas Cristi Cambiasso
  • Nikos Prantzos
  • Olcay Plevne
  • Olivier Bienaymé
  • Ortwin Gerhard (Online)
  • Paola Re Fiorentin
  • Paul Mcmillan
  • Payel Das
  • Pier Giorgio Prada Moroni
  • Raffaele Pascale
  • Robert Grand
  • Salvatore Taibi
  • Samir Nepal
  • Sara Vitali
  • Sarah Pearson
  • Saskia Hekker
  • Sena Matsui
  • Sergey Khoperskov
  • Silvia Leanza
  • Simon Alinder
  • Sofia Randich
  • Stephanie Monty
  • Sven Buder
  • Tadafumi Matsuno
  • Tatiana Muraveva
  • Thomas Callingham
  • Thomas Tomlinson
  • Tobias Buck
  • Valeria Cerqui
  • Vasily Belokurov
  • Vedant Chandra
  • Vincenzo Ripepi
  • Walter Van Rossem
  • Yongjun Jiao (Online)
  • Yoshihisa Suzuki
  • Zhao-Yu Li
  • Zoe Hackshaw
    • Session: MW Halo chemo-dynamics
      • 1
      • 2
        The Milky Way's assembly tale told by the different characters
        Speaker: Amina Helmi
      • 3
        Tracing the Milky Way's ancient footsteps: Insights from chemodynamical investigations of bright and distant metal-poor stars
        Speaker: Akshara Viswanathan (Kapteyn Astronomical Institute, University of Groningen)
      • 4
        A Walk on the Retrograde Side (WRS) project
        Speaker: Edoardo Ceccarelli (Istituto Nazionale di Astrofisica (INAF))
    • 10:30 AM
      Coffee Break
    • Session: MW Halo chemo-dynamics
      • 5
        Disc emergence in the Milky Way and the local view on the messy, turbulent state of high-redshift galaxies
        Speaker: Vasily Belokurov
      • 6
        Bar resonances in the highly eccentric stellar halo
        Speaker: Adam Dillamore (Institute of Astronomy, University of Cambridge)
      • 7
        Simulation Perturbation Theory: Modeling the Response of Stellar Streams to Galactic Substructure with Differentiable Simulations
        Speaker: Jacob Nibauer (Princeton University)
      • 8
        Unveiling the Galactic Horizons: From the Heart to the Halo
        Speaker: Vedant Chandra (Harvard University)
    • 12:30 PM
      Lunch Break
    • Session: MW Halo chemo-dynamics
      • 9
        Chemistry of halo substructures
        Speaker: Diane Feuillet
      • 10
        The Role of the r-Process in Shaping the Milky Way's History
        Speaker: David Aguado (Instituto de Astrofísica de Canarias)
      • 11
        Deciphering the Primordial Milky Way: Insights from Galactic Chemical Evolution Modeling
        Speaker: Boquan Chen
      • 12
        The origins of stellar populations in the Milky Way halo revealed by precise chemical abundances
        Speaker: Tadafumi Matsuno (ARI, Heidelberg University)
    • 3:30 PM
      Coffe Break
    • Session: MW Halo chemo-dynamics
      • 13
        New views on the metal-poor Milky Way halo
        Speaker: Else Starkenburg
      • 14
        Unveiling the dynamical properties of the ancient inner Galaxy with PIGS
        Speaker: Dr Anke Ardern-Arentsen (IoA, Cambridge)
      • 15
        Metallicity distributions of halo stars: do they trace the Galactic accretion history?
        Speaker: Alice MORI (Dipartimento di Fisica e Astronomia, Università di Firenze)
      • 16
        Chronochemodynamics of the Milky Way Halo with GALAH
        Speaker: Sven Buder (Australian National University Canberra)
      • 17
    • Session: MW Halo chemo-dynamics
      • 18
        The History of the Galactic Disk(s)
        Speaker: Hans-Walter Rix
      • 19
        On the early assembly history of the Galaxy
        Speaker: Danny Horta (Flatiron institute)
      • 20
        Galactic Archaeology with Globular Clusters - Europium is a Chemical Tag Between Globular and their Hosts Across All Metallicities
        Speaker: Stephanie Monty (Australian National University)
      • 21
        Globular Cluster Stream Populations of Milky Way-type Galaxies - How Many More Streams Can We Find?
        Speaker: Sarah Pearson (University of Copenhagen)
    • 10:30 AM
      Coffe Break
    • Session: MW Halo chemo-dynamics
      • 22
        Chemical Cartography of the Sagittarius Stream with Gaia
        Speaker: Emily Cunningham
      • 23
        A portrait of the vast polar structure as a young phenomenon: Hints from its member satellites
        Speaker: Salvatore Taibi (Leibniz Institute for Astrophysics Potsdam)
      • 24
        The epoch of Milky Way dwarf accretion from Gaia DR3
        Speaker: Francois Hammer
      • 25
        The impact of early mergers in the star formation history of the Milky Way disc
        Speaker: Emma Fernández-Alvar (Universidad de La Laguna / Instituto de Astrofísica de Canarias)
    • 12:30 PM
      Lunch Break
    • Session: MW Disc chemo-dynamics
      • 26
        Speaker: Cristina Chiappini
      • 27
        On the origin of the Galactic thin and thick discs, their abundance gradients and the diagnostic potential of their abundance ratios
        Speaker: Nikos Prantzos (Institut d'Astrophysique de paris)
      • 28
        What is rotating in the ancient Milky Way: a disc or a halo
        Speaker: Hanyuan Zhang (University of Cambridge)
      • 29
        Stellar radial migration induced by bar-spiral interaction in the Milky Way
        Speaker: Lea Marques (Leibniz-Institut fur Astrophysik Potsdam, Germany (AIP))
    • 3:30 PM
      Coffe Break
    • Session: MW Disc chemo-dynamics
      • 30
        The Milky Way Assembly tale from the dynamics of its disc and substructures
        Speaker: Chervin Laporte
      • 31
        Warping, breaking and spiralling: the many disturbances of the outer Milky Way disc
        Speaker: Paul McMillan (University of Leicester)
      • 32
        Late accretion history of the Milky Way encoded in the disc phase space
        Speaker: Teresa Antoja (Institut de Ciències del Cosmos ICCUB, Universitat de Barcelona)
      • 33
    • Session: MW Disc chemo-dynamics
      • 34
        Deciphering the evolution of the Milky Way discs: Gaia APOGEE Kepler giant stars and the Besançon Galaxy Model
        Speaker: Nadège Lagarde (Laboratoire d'Astrophysique de Bordeaux)
      • 35
        Unveiling the Formation of the Milky Way Disk: A Comprehensive Exploration of the Proto-Galactic Disk Star Formation History
        Speaker: Anna Queiroz (Instituto de Astrofisica de Canarias)
      • 36
        Gaia’s all-sky data to unravel the Galactic disk evolution
        Speaker: Marc del Alcázar Julià (Universitat de Barcelona)
      • 37
        A search for substructures near the Galactic plane using RR Lyrae stars as tracers
        Speaker: Nicolás Cristi Cambiaso (Pontificia Universidad Católica de Chile)
    • 10:20 AM
      Coffe Break
    • Session: MW Disc chemo-dynamics
      • 38
        The chemistry of the Milky Way disc with the Gaia space mission
        Speaker: Alejandra Recio-Blanco
      • 39
        Chemical Cartography in the Galactic Disk
        Speaker: Keith Hawkins (University of Texas at Austin)
      • 40
        Constraining the Milky Way disk's chemical evolution using an empirically derived metallicity profile with time and radius
        Speaker: Bridget Ratcliffe (Leibniz Institute for Astrophysics Potsdam (AIP))
      • 41
        Probing the Solar Neighborhood: A Comprehensive Analysis of our neighborhood’s Age x Metallicity relation through ~ 50000 Subgiant Stars
        Speaker: David Nataf (Johns Hopkins University)
    • 12:30 PM
      Lunch Break
    • Session: Extra-galactic assembly
      • 42
        The assembly history of the Milky Way satellites
        Speaker: Alessio Mucciarelli
      • 43
        A Magellanic origin of the satellite plane?
        Speaker: Eugene Vasiliev (University of Surrey)
      • 44
        On the possible Origins of Phase-Space Structures among Satellite Galaxies in the Local Group
        Speaker: Marcel Pawlowski (Leibniz-Institute for Astrophysics Potsdam (AIP))
      • 45
        Hints of a disrupted binary dwarf galaxy in the Sagittarius stream
        Speaker: Elliot Davies (Institute of Astronomy, Cambridge)
    • 3:30 PM
      Coffe Break
    • Session: Extra-galactic assembly
      • 46
        Insights into the Assembly History of M31 from its Halo Globular Clusters
        Speaker: Annette Ferguson
      • 47
        The Assembly History of Andromeda Galaxy (M31): A Major Merger Model and Direct Comparison with Chemodynamical Observations
        Speaker: Charis Tsakonas (National and Kapodistrian University of Athens)
      • 48
        A SPLASH of Kicked-Up Disk Stars in Andromeda's PHAT Halo
        Speaker: Ivanna Escala
      • 49
        Signs of hierarchical merging events in dwarf galaxies
        Speaker: Michele Bellazzini (Istituto Nazionale di Astrofisica (INAF))
    • Social dinner: SOCIAL DINNER : CANTINA BENTIVOGLIO, VIA MASCARELLA 4/B, 40126 BOLOGNA [ indicative start time: 19:30 ]
    • Session: Heavy data
      • 50
        Machine-learning methods for stellar spectroscopy in the era of large scale surveys
        Speaker: Guillaume Guiglion
      • 51
        Spectro-Translator: A new method to homogenize large Spectroscopic catalog
        Speaker: Guillaume Thomas (Instituto de Astrofísica de Canarias (IAC))
      • 52
        From metal-poor to metal-rich - new insights on MW disc history with machine learning and Gaia
        Speaker: Samir Nepal (AIP, Potsdam)
      • 53
        Machine learning models for separating accreted and in-situ stars in Milky Way-type galaxies
        Speaker: Andrea Sante (Liverpool John Moores University / The Alan Turing Institute)
    • 10:30 AM
      Coffe Break
    • Session: The role of age
      • 54
        A revolution in stellar age determination
        Speaker: Payel Das
      • 55
        Chronology of our Galaxy from Gaia color-magnitude diagram fitting (ChronoGal): spatially resolved star formation histories of the Milky Way disk and halo
        Speaker: Carme Gallart
      • 56
        Star formation history of the Milky Way disk with Gaia DR3
        Speaker: Michele Cignoni (Dipartimento di Fisica, Universita' di Pisa)
      • 57
        Massively determining stellar ages with SPInS
        Speaker: Laia Casamiquela (GEPI Observatoire de Paris)
    • 12:40 PM
      Lunch Break
    • Session: The role of age
      • 58
        Precision and accuracy of stellar age estimates
        Speaker: Karsten Brogaard
      • 59
        The CARMA project: homogeneous ages of Globular clusters to probe the Galactic assembly
        Speaker: Matteo Monelli (Istituto de Astrofísica de Canarias (IAC))
      • 60
        Impact of α and O enhancement on asteroseismic age determination of field stars: application to the APO-K2 catalogue
        Speaker: Pier Giorgio Prada Moroni
      • 61
        Helioseismic determination of the metal mass fraction in the solar convective envelope
        Speaker: Gaël Buldgen (Université de Genève)
    • 3:30 PM
      Coffe Break
    • Session: The role of age
      • 62
        Uncertainties on stellar models and methods of age estimates
        Speaker: Georges Meynet
      • 63
        Tracing the Milky Way's Journey Through Time
        Speaker: Giada Casali (Istituto Nazionale di Astrofisica (INAF))
      • 64
        New view of Galactic discs : unveiling precise ages with individual oscillation modes
        Speaker: Josefina Montalban (Universita di Bologna)
      • 65
        The Milky Way Assembly Tale: the Plato era
        Speaker: Saskia Hekker (Heidelberg University & HITS)
      • 66
    • Session: Predictions by simulations
      • 67
        The Milky Way Assembly Tale as told by the NIHAO-UHD simulations
        Speaker: Tobias Buck
      • 68
        High-fidelity cosmological simulations of the Local Group
        Speaker: Ewoud Wempe (Kapteyn Astronomical Institute, University of Groningen)
      • 69
        The cosmological formation of Milky Way-like disks
        Speaker: Prof. Andrew Wetzel (University of California, Davis)
      • 70
        Studying the stellar disc and halo of the Milky Way with the GASTRO Simulations and Blue Horizontal Branch Stars
        Speaker: Dr Joao A. S. Amarante (ICC-UB)
    • 10:30 AM
      Coffe Break
    • Session: Predictions by simulations
      • 71
        Predicting the impact of the Galaxy’s mergers on the disc(s) and bar with cosmological simulations
        Speaker: Robert Grand
      • 72
        Origin of chemical bimodality in the Milky Way-like disk galaxies: insights from cosmological simulations
        Speaker: Sergey Khoperskov
      • 73
        Digging for the relics of ancient mergers at the heart of the Milky Way
        Speaker: Thomas Tomlinson (Durham University)
    • 12:10 PM
      Lunch Break