Tracing back the birth environments of Type Ia supernova progenitor stars: A pilot study based on 44 early-type host galaxies
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| Format: | Preprint |
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2024
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| _version_ | 1866929282608005120 |
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| author | Kim, Young-Lo Galbany, Lluís Hook, Isobel Kang, Yijung |
| author_facet | Kim, Young-Lo Galbany, Lluís Hook, Isobel Kang, Yijung |
| contents | The environmental dependence of Type Ia supernova (SN Ia) luminosities is well-established, and efforts are being made to find its origin. Previous studies typically use the currently-observed status of the host galaxy. However, given the delay time between the birth of the progenitor star and the SN Ia explosion, the currently-observed status may differ from the birth environments of the SN Ia progenitor star. In this paper, employing the chemical evolution and accurately determined stellar population properties of 44 early-type host galaxies, we, for the first time, estimate the SN Ia progenitor star birth environment, specifically $[Fe/H]_{Birth}$ and $[α/Fe]_{Birth}$. We show that $[α/Fe]_{Birth}$ has a $30.4^{+10.6}_{-10.1}\%$ wider range than $[α/Fe]_{Current}$, while the range of $[Fe/H]_{Birth}$ is not statistically different ($17.9^{+26.0}_{-27.1}\%$) to that of $[Fe/H]_{Current}$. The birth and current environments of [Fe/H] and [$α$/Fe] are sample from different populations (p-values of the KS test < 0.01). We find that light-curve fit parameters are insensitive to $[Fe/H]_{Birth}$ ($<0.9σ$ for the non-zero slope), while a linear trend is observed with HRs at the 2.4$σ$ significance level. With $[α/Fe]_{Birth}$, no linear trends ($<1.1σ$) are observed. Interestingly, we find that $[α/Fe]_{Birth}$ clearly splits the SN Ia sample into two groups: SN Ia exploded in $[α/Fe]_{Birth}$-rich or $[α/Fe]_{Birth}$-poor environments. SNe Ia exploded in different $[α/Fe]_{Birth}$ groups have different weighted-means of light-curve shape parameters: $0.81\pm0.33$ ($2.5σ$). They are thought to be drawn from different populations (p-value = 0.01). Regarding SN Ia colour and HRs, there is no difference in the weighted-means ($<1.0σ$) and distributions (p-value > 0.27) of each $[α/Fe]_{Birth}$ group. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_13057 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tracing back the birth environments of Type Ia supernova progenitor stars: A pilot study based on 44 early-type host galaxies Kim, Young-Lo Galbany, Lluís Hook, Isobel Kang, Yijung High Energy Astrophysical Phenomena Astrophysics of Galaxies Solar and Stellar Astrophysics The environmental dependence of Type Ia supernova (SN Ia) luminosities is well-established, and efforts are being made to find its origin. Previous studies typically use the currently-observed status of the host galaxy. However, given the delay time between the birth of the progenitor star and the SN Ia explosion, the currently-observed status may differ from the birth environments of the SN Ia progenitor star. In this paper, employing the chemical evolution and accurately determined stellar population properties of 44 early-type host galaxies, we, for the first time, estimate the SN Ia progenitor star birth environment, specifically $[Fe/H]_{Birth}$ and $[α/Fe]_{Birth}$. We show that $[α/Fe]_{Birth}$ has a $30.4^{+10.6}_{-10.1}\%$ wider range than $[α/Fe]_{Current}$, while the range of $[Fe/H]_{Birth}$ is not statistically different ($17.9^{+26.0}_{-27.1}\%$) to that of $[Fe/H]_{Current}$. The birth and current environments of [Fe/H] and [$α$/Fe] are sample from different populations (p-values of the KS test < 0.01). We find that light-curve fit parameters are insensitive to $[Fe/H]_{Birth}$ ($<0.9σ$ for the non-zero slope), while a linear trend is observed with HRs at the 2.4$σ$ significance level. With $[α/Fe]_{Birth}$, no linear trends ($<1.1σ$) are observed. Interestingly, we find that $[α/Fe]_{Birth}$ clearly splits the SN Ia sample into two groups: SN Ia exploded in $[α/Fe]_{Birth}$-rich or $[α/Fe]_{Birth}$-poor environments. SNe Ia exploded in different $[α/Fe]_{Birth}$ groups have different weighted-means of light-curve shape parameters: $0.81\pm0.33$ ($2.5σ$). They are thought to be drawn from different populations (p-value = 0.01). Regarding SN Ia colour and HRs, there is no difference in the weighted-means ($<1.0σ$) and distributions (p-value > 0.27) of each $[α/Fe]_{Birth}$ group. |
| title | Tracing back the birth environments of Type Ia supernova progenitor stars: A pilot study based on 44 early-type host galaxies |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.13057 |