JWST photometry and astrometry of 47 Tucanæ

Using JWST Near Infrared Camera (NIRCam) images of the globular cluster 47 Tucanæ (or NGC 104), taken at two epochs just 7 months apart, we derived proper-motion membership down to m F322W2 ∼ 27. We identified an intriguing feature at the very low-mass end of the main sequence, around ∼0.08 M ⋅ , at magnitudes m F322W2 ∼ 24 and m F150W2 ∼ 25. This feature, dubbed ‘kink’, is characterized by a prominent discontinuity in the slope of the main sequence. A similar discontinuity is seen in theoretical isochrones with oxygen-poor chemistries, related to the rapid onset of CH 4 absorption. We therefore hypothesize that the cluster hosts disproportionately more oxygen-poor stars near the bottom of the main sequence compared to the upper main sequence and the red giant branch. Our results show no strong or conclusive evidence of a rise in the brown dwarf luminosity function at faint magnitudes, in contrast to previous findings likely affected by faint red background galaxies. In our analysis, we accounted for this contamination by using proper motion membership.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-01-10
DOI
https://doi.org/10.1051/0004-6361/202452907
Citations
6
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
6.93
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article

JWST photometry and astrometry of 47 Tucanæ

Matteo Correnti, Jeremy Heyl, Adam J. Burgasser, M. Libralato et al.
6 citations
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
6.93
article

JWST photometry and astrometry of 47 Tucanæ

Matteo Correnti, Jeremy Heyl, Adam J. Burgasser, M. Libralato, Ilaria Caiazzo, E. Vesperini, M. Griggio, H. Richer, D. Nardiello, L. R. Bedin, M. Scalco, Roman Gerasimov, J. Anderson
article en
6 citations

Abstract

Using JWST Near Infrared Camera (NIRCam) images of the globular cluster 47 Tucanæ (or NGC 104), taken at two epochs just 7 months apart, we derived proper-motion membership down to m F322W2 ∼ 27. We identified an intriguing feature at the very low-mass end of the main sequence, around ∼0.08 M ⋅ , at magnitudes m F322W2 ∼ 24 and m F150W2 ∼ 25. This feature, dubbed ‘kink’, is characterized by a prominent discontinuity in the slope of the main sequence. A similar discontinuity is seen in theoretical isochrones with oxygen-poor chemistries, related to the rapid onset of CH 4 absorption. We therefore hypothesize that the cluster hosts disproportionately more oxygen-poor stars near the bottom of the main sequence compared to the upper main sequence and the red giant branch. Our results show no strong or conclusive evidence of a rise in the brown dwarf luminosity function at faint magnitudes, in contrast to previous findings likely affected by faint red background galaxies. In our analysis, we accounted for this contamination by using proper motion membership.

Astronomy and AstrophysicsVol. 694
University of Notre Dame (US), California Institute of Technology (US), Space Telescope Science Institute (US), University of British Columbia (CA), Institute of Science and Technology Austria (AT), University of Ferrara (IT), Astronomical Observatory of Rome (IT), Agenzia Spaziale Italiana (IT), University of California San Diego (US), Université Bourgogne Franche-Comté (FR), Indiana University Bloomington (US), Osservatorio Astronomico di Padova (IT), National Institute for Astrophysics (IT)
Openalex Percentile: Top 4%
Stellar, planetary, and galactic studies
6.93
DOIOpen Access PDFOpenAlex
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