High-Precision Near-Infrared Abundances of Solar Analogs in the YJ Bands
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arXiv
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| Natura: | Preprint |
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2026
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| author | Matsunaga, Noriyuki Tsujimoto, Takuji Taniguchi, Daisuke Sameshima, Hiroaki Otsubo, Shogo Takeuchi, Tomomi Sarugaku, Yuki Petralia, Ilaria Elgueta, Scarlet Coello-Guzman, Matilde Fukue, Kei Ikeda, Yuji Kawakita, Hideyo D'Orazi, Valentina Bono, Giuseppe |
| author_facet | Matsunaga, Noriyuki Tsujimoto, Takuji Taniguchi, Daisuke Sameshima, Hiroaki Otsubo, Shogo Takeuchi, Tomomi Sarugaku, Yuki Petralia, Ilaria Elgueta, Scarlet Coello-Guzman, Matilde Fukue, Kei Ikeda, Yuji Kawakita, Hideyo D'Orazi, Valentina Bono, Giuseppe |
| contents | We present a near-infrared abundance analysis of 46 solar analogs with known ages, observed with the WINERED WIDE-mode spectrograph at a resolution of $λ/Δλ= 28,000$. Using an empirically calibrated, line-by-line approach in the $YJ$ bands (0.976--1.089 and 1.182--1.319~{$μ$}m), we derive abundances for 16 elements. Despite the intrinsic weakness of near-infrared phosphorus diagnostics, the combination of five P\,{\sc i} lines yields a typical uncertainty half-width of $\sim$0.04~dex, providing an estimate of the internal precision over the solar-analog sample. For other elements, the internal precision ranges from $\sim$0.01~dex for Fe and Si to over 0.05--0.14~dex for elements with only a couple of lines available. The resulting per-object abundances for various elements are consistent with previous measurements using high-precision optical spectra with residuals of 0.03--0.2~dex depending on the element. The inferred age--[X/Fe] relations reproduce known trends for the thin disk, while extending them to elements difficult to access in the optical, including P and K. We find the slope of the age--[P/Fe] relation is steeper than that for $α$ elements, which provides an empirical constraint for future modeling of Galactic phosphorus evolution. In addition, we publish a high signal-to-noise (S/N 500--1000) reference spectrum constructed by combining solar-analog spectra, together with the spectra of individual stars, and an empirically calibrated line list with per-line zero-point corrections, for future near-infrared spectroscopic studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_00981 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-Precision Near-Infrared Abundances of Solar Analogs in the YJ Bands Matsunaga, Noriyuki Tsujimoto, Takuji Taniguchi, Daisuke Sameshima, Hiroaki Otsubo, Shogo Takeuchi, Tomomi Sarugaku, Yuki Petralia, Ilaria Elgueta, Scarlet Coello-Guzman, Matilde Fukue, Kei Ikeda, Yuji Kawakita, Hideyo D'Orazi, Valentina Bono, Giuseppe Solar and Stellar Astrophysics We present a near-infrared abundance analysis of 46 solar analogs with known ages, observed with the WINERED WIDE-mode spectrograph at a resolution of $λ/Δλ= 28,000$. Using an empirically calibrated, line-by-line approach in the $YJ$ bands (0.976--1.089 and 1.182--1.319~{$μ$}m), we derive abundances for 16 elements. Despite the intrinsic weakness of near-infrared phosphorus diagnostics, the combination of five P\,{\sc i} lines yields a typical uncertainty half-width of $\sim$0.04~dex, providing an estimate of the internal precision over the solar-analog sample. For other elements, the internal precision ranges from $\sim$0.01~dex for Fe and Si to over 0.05--0.14~dex for elements with only a couple of lines available. The resulting per-object abundances for various elements are consistent with previous measurements using high-precision optical spectra with residuals of 0.03--0.2~dex depending on the element. The inferred age--[X/Fe] relations reproduce known trends for the thin disk, while extending them to elements difficult to access in the optical, including P and K. We find the slope of the age--[P/Fe] relation is steeper than that for $α$ elements, which provides an empirical constraint for future modeling of Galactic phosphorus evolution. In addition, we publish a high signal-to-noise (S/N 500--1000) reference spectrum constructed by combining solar-analog spectra, together with the spectra of individual stars, and an empirically calibrated line list with per-line zero-point corrections, for future near-infrared spectroscopic studies. |
| title | High-Precision Near-Infrared Abundances of Solar Analogs in the YJ Bands |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2604.00981 |