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TESS exoplanet candidates validated with HARPS archival data. A massive Neptune around GJ143 and two Neptunes around HD23472
Trifon Trifonov, Jan Rybizki, Martin Kürster
We aim at the discovery of new planetary systems by exploiting the transit light curve results from TESS orbital observatory's Sector 1 and 2 observations and validating them with…
Chemical Cartography with APOGEE: Multi-element abundance ratios
David H. Weinberg, Jon A. Holtzman, Sten Hasselquist +25
We map the trends of elemental abundance ratios across the Galactic disk, spanning R = 3-15 kpc and midplane distance |Z|= 0-2 kpc, for 15 elements in a sample of 20,485 stars meas…
New stellar encounters discovered in the second Gaia data release
C. A. L. Bailer-Jones, J. Rybizki, R. Andrae +1
Passing stars may play an important role in the evolution of our solar system. We search for close stellar encounters to the Sun among all 7.2 million stars in Gaia-DR2 that have s…
A Gaia DR2 Mock Stellar Catalog
Jan Rybizki, Markus Demleitner, Morgan Fouesneau +3
We present a mock catalog of Milky Way stars, matching in volume and depth the content of the Gaia data release 2 (GDR2). We generated our catalog using Galaxia, a tool to sample s…
Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
C. A. L. Bailer-Jones, J. Rybizki, M. Fouesneau +2
For the vast majority of stars in the second Gaia data release, reliable distances cannot be obtained by inverting the parallax. A correct inference procedure must instead be used…
Age-resolved chemistry of red giants in the solar neighbourhood
Diane K. Feuillet, Jo Bovy, Jon Holtzman +7
In the age of high-resolution spectroscopic stellar surveys of the Milky Way, the number of stars with detailed abundances of multiple elements is rapidly increasing. These element…
Inference from modelling the chemodynamical evolution of the Milky Way disc
Jan Rybizki
In this thesis, the field star Initial Mass Function (IMF) and chemical evolution parameters for the Milky Way (MW) are derived using a forward modelling technique in combination w…