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Helmer Koppelman
Helmer Koppelman
Data Scientist
Verified email at entis.ai
Title
Cited by
Cited by
Year
The merger that led to the formation of the Milky Way’s inner stellar halo and thick disk
A Helmi, C Babusiaux, HH Koppelman, D Massari, J Veljanoski, ...
Nature 563 (7729), 85-88, 2018
10642018
Origin of the system of globular clusters in the Milky Way
D Massari, HH Koppelman, A Helmi
Astronomy & Astrophysics 630, L4, 2019
3442019
Multiple retrograde substructures in the Galactic halo: A shattered view of Galactic history
HH Koppelman, A Helmi, D Massari, AM Price-Whelan, TK Starkenburg
Astronomy & Astrophysics 631, L9, 2019
1992019
One large blob and many streams frosting the nearby stellar halo in Gaia DR2
H Koppelman, A Helmi, J Veljanoski
The Astrophysical Journal Letters 860 (1), L11, 2018
1682018
Characterization and history of the Helmi streams with Gaia DR2
HH Koppelman, A Helmi, D Massari, S Roelenga, U Bastian
Astronomy & Astrophysics 625, A5, 2019
1202019
The Pristine survey IV: approaching the Galactic metallicity floor with the discovery of an ultra-metal-poor star
E Starkenburg, DS Aguado, P Bonifacio, E Caffau, P Jablonka, C Lardo, ...
Monthly Notices of the Royal Astronomical Society 481 (3), 3838-3852, 2018
702018
The messy merger of a large satellite and a Milky Way-like galaxy
HH Koppelman, ROY Bos, A Helmi
Astronomy & Astrophysics 642, L18, 2020
482020
Electrically tunable wetting defects characterized by a simple capillary force sensor
D ’t Mannetje, A Banpurkar, H Koppelman, MHG Duits, D van den Ende, ...
Langmuir 29 (31), 9944-9949, 2013
442013
Determination of the escape velocity of the Milky Way using a halo sample selected based on proper motion
HH Koppelman, A Helmi
Astronomy & Astrophysics 649, A136, 2021
24*2021
Galactic potential constraints from clustering in action space of combined stellar stream data
S Reino, EM Rossi, RE Sanderson, E Sellentin, A Helmi, HH Koppelman, ...
Monthly Notices of the Royal Astronomical Society 502 (3), 4170-4193, 2021
232021
Substructure in the stellar halo near the Sun-I. Data-driven clustering in integrals-of-motion space
SS Lövdal, T Ruiz-Lara, HH Koppelman, T Matsuno, E Dodd, A Helmi
Astronomy & Astrophysics 665, A57, 2022
212022
Substructure in the stellar halo near the Sun-II. Characterisation of independent structures
T Ruiz-Lara, T Matsuno, SS Lövdal, A Helmi, E Dodd, HH Koppelman
Astronomy & Astrophysics 665, A58, 2022
192022
High-precision chemical abundances of Galactic building blocks-The distinct chemical abundance sequence of Sequoia
T Matsuno, HH Koppelman, A Helmi, W Aoki, MN Ishigaki, T Suda, Z Yuan, ...
Astronomy & Astrophysics 661, A103, 2022
192022
Age determination of galaxy merger remnant stars using asteroseismology
CC Borre, V Aguirre Børsen-Koch, A Helmi, HH Koppelman, MB Nielsen, ...
Monthly Notices of the Royal Astronomical Society 514 (2), 2527-2544, 2022
172022
High-precision chemical abundances of Galactic building blocks-II. Revisiting the chemical distinctness of the Helmi streams
T Matsuno, E Dodd, HH Koppelman, A Helmi, MN Ishigaki, W Aoki, J Zhao, ...
Astronomy & Astrophysics 665, A46, 2022
152022
Substructures, resonances, and debris streams-A new constraint on the inner shape of the Galactic dark halo
E Dodd, A Helmi, HH Koppelman
Astronomy & Astrophysics 659, A61, 2022
132022
Frequencies, chaos, and resonances: A study of orbital parameters of nearby thick-disc and halo stars
HH Koppelman, JHJ Hagen, A Helmi
Astronomy & Astrophysics 647, A37, 2021
102021
The reduced proper motion selected halo: Methods and description of the catalogue
HH Koppelman, A Helmi
Astronomy & Astrophysics 645, A69, 2021
102021
The time evolution of gaps in tidal streams
A Helmi, HH Koppelman
The Astrophysical Journal Letters 828 (1), L10, 2016
102016
Hidden deep in the halo: selection of a reduced proper motion halo catalogue and mining retrograde streams in the velocity space
A Viswanathan, E Starkenburg, HH Koppelman, A Helmi, E Balbinot, ...
Monthly Notices of the Royal Astronomical Society 521 (2), 2087-2102, 2023
92023
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