VLT/MUSE detection of accretion-ejection associated with the close stellar companion in the HT Lup system
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866912004896194560 |
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| author | Jorquera, Sebastián Bonnefoy, Mickaël Pérez, Laura M. Chauvin, Gaël Aguinaga, Adrian Dougados, Catherine Julo, Rémi Demars, Dorian Andrews, Sean M. Ricci, Luca Zhu, Zhaohuan kurtovic, Nicolas T. Cuello, Nicolás Bai, Xue-ning Birnstiel, Til Dullemond, Cornelis Guzmán, Viviana V. |
| author_facet | Jorquera, Sebastián Bonnefoy, Mickaël Pérez, Laura M. Chauvin, Gaël Aguinaga, Adrian Dougados, Catherine Julo, Rémi Demars, Dorian Andrews, Sean M. Ricci, Luca Zhu, Zhaohuan kurtovic, Nicolas T. Cuello, Nicolás Bai, Xue-ning Birnstiel, Til Dullemond, Cornelis Guzmán, Viviana V. |
| contents | The accretion/ejection processes in T-Tauri stars are fundamental to their physical evolution, while also impacting the properties and evolution of the circumstellar material at a time when planet formation takes place. To this date, characterization of ongoing accretion processes in stellar pairs at 5-50\,au scales has been challenging, high angular resolution spectrographs are required to extract the spectral features of each component. We present the analysis of spectroscopic observations of the tight (160mas, 25au) T-Tauri system HT Lup A/B, obtained with MUSE at VLT in March and July of 2021. We focus on constraining the accretion/ejection processes and variability of the secondary component HT Lup B, by searching for accretion tracers applying High-Resolution Spectral Differential Imaging techniques. We retrieve strong (SNR $>$ 5) $Hα, Hβ$ and [OI]$\lambda6300$ emission in both epochs. The $Hα$ and $Hβ$ line fluxes showcase high variability, with variations up to 400-500\% between epochs. The fluxes are consistent with accretion rates of $8\times10^{-9} M_\odot \, yr^{-1}$ and $2\times10^{-9} M_\odot \, yr^{-1}$ for the first and second epoch, respectively. We attribute the increased accretion activity during the first night to a "burst" like event, followed by a relaxation period more representative of the common accretion activity of the system. The [OI]$\lambda6300$ line profiles remain relatively similar between epochs and suggest ejection rates on the order of $10^{-9}-10^{-10} M_\odot \, yr^{-1}$, compatible with moderate disk winds emission. Our results also indicate that the accretion processes of HT Lup B are compatible with Classical T Tauri Stars, unlike previous classifications |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15976 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | VLT/MUSE detection of accretion-ejection associated with the close stellar companion in the HT Lup system Jorquera, Sebastián Bonnefoy, Mickaël Pérez, Laura M. Chauvin, Gaël Aguinaga, Adrian Dougados, Catherine Julo, Rémi Demars, Dorian Andrews, Sean M. Ricci, Luca Zhu, Zhaohuan kurtovic, Nicolas T. Cuello, Nicolás Bai, Xue-ning Birnstiel, Til Dullemond, Cornelis Guzmán, Viviana V. Solar and Stellar Astrophysics Earth and Planetary Astrophysics The accretion/ejection processes in T-Tauri stars are fundamental to their physical evolution, while also impacting the properties and evolution of the circumstellar material at a time when planet formation takes place. To this date, characterization of ongoing accretion processes in stellar pairs at 5-50\,au scales has been challenging, high angular resolution spectrographs are required to extract the spectral features of each component. We present the analysis of spectroscopic observations of the tight (160mas, 25au) T-Tauri system HT Lup A/B, obtained with MUSE at VLT in March and July of 2021. We focus on constraining the accretion/ejection processes and variability of the secondary component HT Lup B, by searching for accretion tracers applying High-Resolution Spectral Differential Imaging techniques. We retrieve strong (SNR $>$ 5) $Hα, Hβ$ and [OI]$\lambda6300$ emission in both epochs. The $Hα$ and $Hβ$ line fluxes showcase high variability, with variations up to 400-500\% between epochs. The fluxes are consistent with accretion rates of $8\times10^{-9} M_\odot \, yr^{-1}$ and $2\times10^{-9} M_\odot \, yr^{-1}$ for the first and second epoch, respectively. We attribute the increased accretion activity during the first night to a "burst" like event, followed by a relaxation period more representative of the common accretion activity of the system. The [OI]$\lambda6300$ line profiles remain relatively similar between epochs and suggest ejection rates on the order of $10^{-9}-10^{-10} M_\odot \, yr^{-1}$, compatible with moderate disk winds emission. Our results also indicate that the accretion processes of HT Lup B are compatible with Classical T Tauri Stars, unlike previous classifications |
| title | VLT/MUSE detection of accretion-ejection associated with the close stellar companion in the HT Lup system |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2408.15976 |