Gaia confirms that SDSS J102915+172927 is a dwarf star
P. Bonifacio (1), E. Caffau (1), M. Spite (1), F. Spite (1), P., Fran\c{c}ois (1), S. Zaggia (2), F. Arenou (1), R. Haigron (1), N. Leclerc, (1), O. Marchal (1), P. Panuzzo (1), G. Plum (1), P. Sartoretti (1)((1) GEPI,, Observatoire de Paris, Universit\'e PSL, CNRS
TL;DR
Gaia Data Release 2 confirms that SDSS J102915+172927 is a dwarf star, ruling out previous hypotheses about its formation environment and supporting dust cooling as a key process.
Contribution
This study uses Gaia DR2 data to definitively classify SDSS J102915+172927 as a dwarf star, refining our understanding of its formation conditions.
Findings
Confirmed the star as a dwarf using Gaia parallax data
Ruled out the highly enriched medium formation scenario
Reinforced the importance of dust cooling in star formation
Abstract
The Gaia Data Release 2 provides a parallax of 0.734+/-0.073 mas for SDSS J102915+172927, currently the most metal-poor known object. This parallax implies that it is dwarf star, ruling out the scenario that it is a subgiant. The subgiant scenario had as a corollary that the star had been formed in a medium highly enriched in C, thus making line cooling efficient during the collapse, that was also highly enriched in Fe by Type Ia SNe. This scenario can also now be ruled out for this star, reinforcing the need of dust cooling and fragmentation to explain its formation.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Gamma-ray bursts and supernovae · Astro and Planetary Science