Research Publications

Detection of hot subdwarf binaries and sdB stars using machine learning methods and a large sample of Gaia XP spectra

M. Ambrosch, C. Viscasillas Vázquez, E. Solano, A. Ulla, X. Pérez-Couto, E. Pérez-Fernández, A. Medžiūnas, M. Manteiga, C. Dafonte, A. Drazdauskas, L. Magrini, Š. Mikolaitis, and V. Šatas
A&A, 708, A23 (2026)

Our goal is to identify patterns in Gaia XP spectra, investigate binarity, and assess the influence of parameters such as temperature, helium abundance, and variability. We analyse approximately 20 000 hot subdwarf candidates selected from the literature, combining Gaia XP data with published parameters.

Advanced classification of hot subdwarf binaries using artificial intelligence techniques and Gaia DR3 data

C. Viscasillas Vázquez, E. Solano, A. Ulla, M. Ambrosch, M. A. Álvarez, M. Manteiga, L. Magrini, R. Santoveña-Gómez, C. Dafonte, E. Pérez-Fernández, A. Aller, A. Drazdauskas, Š. Mikolaitis, and C. Rodrigo
A&A, 691, A223 (2024)

This study aims to develop a novel classification method for identifying hot subdwarf binaries within large datasets using Artificial Intelligence techniques and data from the third Gaia data release (GDR3). The results will be compared with those obtained previously using Virtual Observatory techniques on coincident samples.

International Conferences

XVII Scientific Meeting of the Spanish Astronomical Society

Date: 13–17 July 2026 | Location: Tarragona, Spain

Hot subdwarf binary detection via Machine Learning on a large Gaia XP spectra sample

Type: Poster Presentation
Authors: V. Šatas, A. Ulla, M. Manteiga, E. Solano, M. Ambrosch, C. Viscasillas Vázquez, X. Pérez-Couto, E. Pérez-Fernández, A. Medžiūnas, C. Dafonte, A. Drazdauskas, L. Magrini, Š. Mikolaitis

Nordic-Baltic Astronomy Days 2026

Date: 26-29 May 2026 | Location: Turku, Finland

Unveiling binary populations of hot subdwarfs with Gaia spectra and machine learning

Type: Oral Presentation
Authors: M. Ambrosch, C. Viscasillas Vázquez, A. Ulla, E. Solano

High-Resolution Spectroscopy of Hot Subdwarfs with VUES: Benchmarking Gaia XP and LAMOST Classifications

Type: Poster Presentation & Rapid Talk
Authors: V. Šatas, C. Viscasillas Vázquez, M. Ambrosch, A. Ulla, E. Solano, Š. Mikolaitis, E. Pérez-Fernández

European Astronomical Society Annual Meeting 2025

Date: 23-27 June 2025 | Location: University College Cork, Cork, Ireland

Studying Hot Subdwarf Binaries with Gaia EDR3 XP Spectra

Authors: M. Ambrosch, C. Viscasillas Vázquez, E. Solano, A. Ulla, X. Pérez-Couto, M. Manteiga, C. Dafonte

Academic Training & Workshops

Astro-CC European Data Provider Forum

Date: 25-27 March 2026 | Location: Heidelberg, Germany

Vladas Šatas attended the Astro-CC European Data Provider Forum. The forum focused on the online publication of astronomical data using International Virtual Observatory Alliance (IVOA) standards, featuring practical sessions on making datasets FAIR-compliant through Virtual Observatory tools such as HiPS, DaCHS, and EPNTAP.

Astro-CC: Training for Virtual Observatory Tools at ESAC

Date: 2-4 December 2025 | Location: Centro de Astrobiología, Madrid, Spain

Vladas Šatas attended Astro-CC training held in European Space Astronomy Centre, Spain. The project aims to enable communities in astronomy, heliospheric physics, planetary science, and astro-particle physics to accelerate the use of Open Science by supporting the implementation of FAIR principles.

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