VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System
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 date, the characterization of ongoing accretion processes in stellar pairs at...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad6e84 |
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| author | Sebastián Jorquera Mickaël Bonnefoy Laura M. Pérez Gaël Chauvin Adrian Aguinaga Catherine Dougados Rémi Julo Dorian Demars Sean M. Andrews Luca Ricci Zhaohuan Zhu Nicolas T. Kurtovic Nicolás Cuello Xue-Ning Bai Til Birnstiel Cornellis Dullemond Viviana V. Guzmán |
| author_facet | Sebastián Jorquera Mickaël Bonnefoy Laura M. Pérez Gaël Chauvin Adrian Aguinaga Catherine Dougados Rémi Julo Dorian Demars Sean M. Andrews Luca Ricci Zhaohuan Zhu Nicolas T. Kurtovic Nicolás Cuello Xue-Ning Bai Til Birnstiel Cornellis Dullemond Viviana V. Guzmán |
| author_sort | Sebastián Jorquera |
| collection | DOAJ |
| description | 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 date, the characterization of ongoing accretion processes in stellar pairs at 5–50 au scales has been challenging as high-angular resolution spectrographs are required to extract the spectral features of each component. We present the analysis of spectroscopic observations of the tight (160 mas, 25 au) T Tauri system HT Lup A/B, obtained with MUSE at the Very Large Telescope in 2021 March and July. We focus on constraining the accretion/ejection processes and variability of the secondary component HT Lup B by searching for accretion tracers by applying high-resolution spectral differential imaging techniques. We retrieve strong (signal-to-noise ratio > 5) H α , H β, and [O i ] λ 6300 emission in both epochs. The H α and H β line fluxes showcase high variability, with variations up to 200%–300% between epochs. The fluxes are consistent with accretion rates of 3× 10 ^−9 M _⊙ yr ^−1 and 8 × 10 ^−10 M _⊙ yr ^−1 for the first and second epochs, 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 [O i ] λ 6300 line profiles remain relatively similar between epochs and suggest ejection rates on the order of 10 ^−9 −10 ^−10 M _⊙ yr ^−1 , compatible with moderate disk wind emission. Our results also indicate that the accretion processes of HT Lup B are compatible with Classical T Tauri stars, unlike previous classifications. |
| format | Article |
| id | doaj-art-172454379ad7449d82e8097e84680060 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-172454379ad7449d82e8097e846800602024-11-12T08:56:25ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197614210.3847/1538-4357/ad6e84VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup SystemSebastián Jorquera0https://orcid.org/0000-0001-6822-7664Mickaël Bonnefoy1https://orcid.org/0000-0001-5579-5339Laura M. Pérez2https://orcid.org/0000-0002-1199-9564Gaël Chauvin3https://orcid.org/0000-0003-4022-8598Adrian Aguinaga4Catherine Dougados5https://orcid.org/0000-0001-6660-936XRémi Julo6Dorian Demars7Sean M. Andrews8https://orcid.org/0000-0003-2253-2270Luca Ricci9https://orcid.org/0000-0001-8123-2943Zhaohuan Zhu10https://orcid.org/0000-0003-3616-6822Nicolas T. Kurtovic11https://orcid.org/0000-0002-2358-4796Nicolás Cuello12https://orcid.org/0000-0003-3713-8073Xue-Ning Bai13https://orcid.org/0000-0001-6906-9549Til Birnstiel14https://orcid.org/0000-0002-1899-8783Cornellis Dullemond15Viviana V. Guzmán16https://orcid.org/0000-0003-4784-3040Departamento de Astronomía, Universidad de Chile , Camino El Observatorio 1515, Las Condes, Santiago, Chile; Université Cote d’Azur , 06304 Nice, FranceUniversité Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, FranceDepartamento de Astronomía, Universidad de Chile , Camino El Observatorio 1515, Las Condes, Santiago, ChileLaboratoire Lagrange, Université Cote d’Azur , CNRS, Observatoire de la Cote d’Azur, 06304 Nice, FranceUniversité Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, FranceUniversité Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, FranceUniversité Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, France; Université Grenoble Alpes , G. INP, CNRS, Gipsa-lab, 38400 Saint-Martin-d’Hères, FranceUniversité Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, FranceCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USADepartment of Physics and Astronomy, California State University Northridge , 18111 Nordhoff Street, Northridge, CA 91330, USADepartment of Physics and Astronomy, University of Nevada , Las Vegas, 4505 S. Maryland Parkway, Las Vegas, NV 89154, USAMax-Planck-Institut für Astronomie , Königstuhl 17, 69117, Heidelberg, GermanyUniversité Grenoble Alpes , CNRS, IPAG, 38000 Grenoble, FranceInstitute for Advanced Study, Tsinghua University , Beijing 100084, People's Republic of China; Department of Astronomy, Tsinghua University , Beijing 100084, People's Republic of ChinaUniversity Observatory , Faculty of Physics, Ludwig-Maximilians- Universität München, Scheinerstr. 1, 81679 Munich, Germany; Exzellenzcluster ORIGINS , Boltzmannstr. 2, D-85748 Garching, GermanyInstitute of Theoretical Astrophysics, Center for Astronomy (ZAH), Ruprecht-Karls-Universität Heidelberg , Albert-Ueberle-Str. 2, 69120 Heidelberg, GermanyInstituto de Astrofísica, Pontificia Universidad Católica de Chile , Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, ChileThe 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 date, the characterization of ongoing accretion processes in stellar pairs at 5–50 au scales has been challenging as high-angular resolution spectrographs are required to extract the spectral features of each component. We present the analysis of spectroscopic observations of the tight (160 mas, 25 au) T Tauri system HT Lup A/B, obtained with MUSE at the Very Large Telescope in 2021 March and July. We focus on constraining the accretion/ejection processes and variability of the secondary component HT Lup B by searching for accretion tracers by applying high-resolution spectral differential imaging techniques. We retrieve strong (signal-to-noise ratio > 5) H α , H β, and [O i ] λ 6300 emission in both epochs. The H α and H β line fluxes showcase high variability, with variations up to 200%–300% between epochs. The fluxes are consistent with accretion rates of 3× 10 ^−9 M _⊙ yr ^−1 and 8 × 10 ^−10 M _⊙ yr ^−1 for the first and second epochs, 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 [O i ] λ 6300 line profiles remain relatively similar between epochs and suggest ejection rates on the order of 10 ^−9 −10 ^−10 M _⊙ yr ^−1 , compatible with moderate disk wind emission. Our results also indicate that the accretion processes of HT Lup B are compatible with Classical T Tauri stars, unlike previous classifications.https://doi.org/10.3847/1538-4357/ad6e84Binary starsClose binary starsHigh contrast spectroscopyHigh contrast techniquesDirect imagingStellar accretion |
| spellingShingle | Sebastián Jorquera Mickaël Bonnefoy Laura M. Pérez Gaël Chauvin Adrian Aguinaga Catherine Dougados Rémi Julo Dorian Demars Sean M. Andrews Luca Ricci Zhaohuan Zhu Nicolas T. Kurtovic Nicolás Cuello Xue-Ning Bai Til Birnstiel Cornellis Dullemond Viviana V. Guzmán VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System The Astrophysical Journal Binary stars Close binary stars High contrast spectroscopy High contrast techniques Direct imaging Stellar accretion |
| title | VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System |
| title_full | VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System |
| title_fullStr | VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System |
| title_full_unstemmed | VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System |
| title_short | VLT/MUSE Detection of Accretion/Ejection Associated with the Close Stellar Companion in the HT Lup System |
| title_sort | vlt muse detection of accretion ejection associated with the close stellar companion in the ht lup system |
| topic | Binary stars Close binary stars High contrast spectroscopy High contrast techniques Direct imaging Stellar accretion |
| url | https://doi.org/10.3847/1538-4357/ad6e84 |
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