First Detection and Modeling of Spatially Resolved Ly$α$ in TW Hya
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arXiv
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| Format: | Preprint |
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2023
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| author | Chang, Seok-Jun Arulanantham, Nicole Gronke, Max Herczeg, Gregory J. Bergin, Edwin A. |
| author_facet | Chang, Seok-Jun Arulanantham, Nicole Gronke, Max Herczeg, Gregory J. Bergin, Edwin A. |
| contents | Lyman-$α$ (Ly$α$) is the strongest emission line in the accretion-generated UV spectra from T-Tauri stars and, as such, plays a critical role in regulating chemistry within the surrounding protoplanetary disks. Due to its resonant nature, the scattering of Ly$α$ photons along the line-of-sight encodes information about the physical properties of the intervening H I medium. In this work, we present the first spatially resolved spectral images of Ly$α$ emission across a protoplanetary disk in the iconic face-on T-Tauri star TW Hya, observed with HST-STIS at spatial offsets 0$''$, $\pm 0.2''$, and $\pm 0.4''$. To comprehensively interpret these Ly$α$ spectra, we utilize a 3D Monte-Carlo Ly$α$ radiative transfer simulation considering the H I wind and protoplanetary disk. From the simulation, we constrain the wind's properties: the H I column density $\sim 10^{20}\, \rm cm^{-2}$ and the outflow velocity $\sim 200\, \rm km\, s^{-1}$. Our findings indicate that successfully interpreting the observed spectra necessitates scattering contributions in the H I layer within the disk. Furthermore, to explore the effect of Ly$α$ radiative transfer on protoplanetary disk chemistry, we compute the radiation field within the scattering medium and reveal that the wind reflection causes more Ly$α$ photons to penetrate the disk. Our results show the necessity of spatially resolved Ly$α$ observations of a broad range of targets, which will decode the complex interactions between the winds, protoplanetary disks, and surrounding environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_14477 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | First Detection and Modeling of Spatially Resolved Ly$α$ in TW Hya Chang, Seok-Jun Arulanantham, Nicole Gronke, Max Herczeg, Gregory J. Bergin, Edwin A. Solar and Stellar Astrophysics Earth and Planetary Astrophysics Lyman-$α$ (Ly$α$) is the strongest emission line in the accretion-generated UV spectra from T-Tauri stars and, as such, plays a critical role in regulating chemistry within the surrounding protoplanetary disks. Due to its resonant nature, the scattering of Ly$α$ photons along the line-of-sight encodes information about the physical properties of the intervening H I medium. In this work, we present the first spatially resolved spectral images of Ly$α$ emission across a protoplanetary disk in the iconic face-on T-Tauri star TW Hya, observed with HST-STIS at spatial offsets 0$''$, $\pm 0.2''$, and $\pm 0.4''$. To comprehensively interpret these Ly$α$ spectra, we utilize a 3D Monte-Carlo Ly$α$ radiative transfer simulation considering the H I wind and protoplanetary disk. From the simulation, we constrain the wind's properties: the H I column density $\sim 10^{20}\, \rm cm^{-2}$ and the outflow velocity $\sim 200\, \rm km\, s^{-1}$. Our findings indicate that successfully interpreting the observed spectra necessitates scattering contributions in the H I layer within the disk. Furthermore, to explore the effect of Ly$α$ radiative transfer on protoplanetary disk chemistry, we compute the radiation field within the scattering medium and reveal that the wind reflection causes more Ly$α$ photons to penetrate the disk. Our results show the necessity of spatially resolved Ly$α$ observations of a broad range of targets, which will decode the complex interactions between the winds, protoplanetary disks, and surrounding environments. |
| title | First Detection and Modeling of Spatially Resolved Ly$α$ in TW Hya |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2310.14477 |