Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914026956521472 |
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| author | Ceva, William Matthews, Elisabeth C. Rickman, Emily L. Ségransan, Damien Vigan, Arthur Bowler, Brendan P. Forveille, Thierry Franson, Kyle Hagelberg, Janis Udry, Stéphane |
| author_facet | Ceva, William Matthews, Elisabeth C. Rickman, Emily L. Ségransan, Damien Vigan, Arthur Bowler, Brendan P. Forveille, Thierry Franson, Kyle Hagelberg, Janis Udry, Stéphane |
| contents | We used multiple epochs of high-contrast imaging spectrophotometric observations to determine the atmospheric characteristics and thermal evolution of two previously detected benchmark L dwarf companions, HD 112863 B and HD 206505 B. We analyzed IRDIS and IFS data from VLT/SPHERE of each companion, both of which have dynamical masses near the stellar-substellar boundary. We compared each companion with empirical spectral standards, as well as constrained their physical properties through atmospheric model fits. From these analyses, we estimate that HD 112863 B is spectral type $\rm{L}3\pm1$ and that HD 206505 B is spectral type $\rm{L}2\pm1$. Using the BT-Settl atmospheric model grids, we find a bimodal solution for the atmospheric model fit of HD 112863 B, such that $T_{\rm{eff}}=1757^{+37}_{-36}$ K or $2002^{+23}_{-24}$ K and $\log{g}=4.973^{+0.057}_{-0.063}$ or $5.253^{+0.037}_{-0.033}$, while for HD 206505 B, $T_{\rm{eff}}=1754^{+13}_{-13}$ K and $\log{g}=4.919^{+0.031}_{-0.029}$. Comparing the bolometric luminosities of both companions with evolutionary models imply that both companions are likely above the hydrogen burning limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_08654 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary Ceva, William Matthews, Elisabeth C. Rickman, Emily L. Ségransan, Damien Vigan, Arthur Bowler, Brendan P. Forveille, Thierry Franson, Kyle Hagelberg, Janis Udry, Stéphane Earth and Planetary Astrophysics Solar and Stellar Astrophysics We used multiple epochs of high-contrast imaging spectrophotometric observations to determine the atmospheric characteristics and thermal evolution of two previously detected benchmark L dwarf companions, HD 112863 B and HD 206505 B. We analyzed IRDIS and IFS data from VLT/SPHERE of each companion, both of which have dynamical masses near the stellar-substellar boundary. We compared each companion with empirical spectral standards, as well as constrained their physical properties through atmospheric model fits. From these analyses, we estimate that HD 112863 B is spectral type $\rm{L}3\pm1$ and that HD 206505 B is spectral type $\rm{L}2\pm1$. Using the BT-Settl atmospheric model grids, we find a bimodal solution for the atmospheric model fit of HD 112863 B, such that $T_{\rm{eff}}=1757^{+37}_{-36}$ K or $2002^{+23}_{-24}$ K and $\log{g}=4.973^{+0.057}_{-0.063}$ or $5.253^{+0.037}_{-0.033}$, while for HD 206505 B, $T_{\rm{eff}}=1754^{+13}_{-13}$ K and $\log{g}=4.919^{+0.031}_{-0.029}$. Comparing the bolometric luminosities of both companions with evolutionary models imply that both companions are likely above the hydrogen burning limit. |
| title | Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2507.08654 |