Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A
The chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism of the planetary systems. We present a detailed high-resolution spectroscopic analysis of a young M-type star, DH Tau A, which is located in the Taurus molecular...
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2024-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ad968c |
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| author | Neda Hejazi Jerry W. Xuan David R. Coria Erica Sawczynec Ian J. M. Crossfield Paul I. Cristofari Zhoujian Zhang Maleah Rhem |
| author_facet | Neda Hejazi Jerry W. Xuan David R. Coria Erica Sawczynec Ian J. M. Crossfield Paul I. Cristofari Zhoujian Zhang Maleah Rhem |
| author_sort | Neda Hejazi |
| collection | DOAJ |
| description | The chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism of the planetary systems. We present a detailed high-resolution spectroscopic analysis of a young M-type star, DH Tau A, which is located in the Taurus molecular cloud belonging to the Taurus-Auriga star-forming region. This star is host to a low-mass companion, DH Tau b, and both the star and the companion are still in their accreting phase. We apply our technique to measure the abundances of carbon and oxygen using carbon- and oxygen-bearing molecules, such as CO and OH, respectively. We determine a near-solar carbon-to-oxygen abundance ratio of C/O = 0.555 ± 0.063 for the host star DH Tau A. We compare this stellar abundance ratio with that of the companion from our previous study ( ${\rm{C}}/{\rm{O}}={0.54}_{-0.05}^{+0.06}$ ), which also has a near-solar value. This confirms the chemical homogeneity in the DH Tau system, which suggests a formation scenario for the companion consistent with a direct and relatively fast gravitational collapse rather than a slow core accretion process. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-df8b0565e0464fc091562172e82c20cf2024-12-24T06:44:08ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197814210.3847/1538-4357/ad968cChemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau ANeda Hejazi0https://orcid.org/0000-0001-5541-6087Jerry W. Xuan1https://orcid.org/0000-0002-6618-1137David R. Coria2https://orcid.org/0000-0002-1221-5346Erica Sawczynec3https://orcid.org/0000-0002-8378-1062Ian J. M. Crossfield4Paul I. Cristofari5https://orcid.org/0000-0003-4019-0630Zhoujian Zhang6https://orcid.org/0000-0002-3726-4881Maleah Rhem7Department of Physics and Astronomy, University of Kansas , Lawrence, KS 66045, USA; Department of Physics and Astronomy, Georgia State University , Atlanta, GA 30303, USADepartment of Astronomy, California Institute of Technology , Pasadena, CA 91125, USADepartment of Physics and Astronomy, University of Kansas , Lawrence, KS 66045, USADepartment of Astronomy, University of Texas , Austin, TX 78712, USADepartment of Physics and Astronomy, University of Kansas , Lawrence, KS 66045, USACenter for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, USADepartment of Astronomy and Astrophysics, University of California , Santa Cruz, CA 95064, USADepartment of Physics and Astronomy, University of Kansas , Lawrence, KS 66045, USAThe chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism of the planetary systems. We present a detailed high-resolution spectroscopic analysis of a young M-type star, DH Tau A, which is located in the Taurus molecular cloud belonging to the Taurus-Auriga star-forming region. This star is host to a low-mass companion, DH Tau b, and both the star and the companion are still in their accreting phase. We apply our technique to measure the abundances of carbon and oxygen using carbon- and oxygen-bearing molecules, such as CO and OH, respectively. We determine a near-solar carbon-to-oxygen abundance ratio of C/O = 0.555 ± 0.063 for the host star DH Tau A. We compare this stellar abundance ratio with that of the companion from our previous study ( ${\rm{C}}/{\rm{O}}={0.54}_{-0.05}^{+0.06}$ ), which also has a near-solar value. This confirms the chemical homogeneity in the DH Tau system, which suggests a formation scenario for the companion consistent with a direct and relatively fast gravitational collapse rather than a slow core accretion process.https://doi.org/10.3847/1538-4357/ad968cM dwarf stars |
| spellingShingle | Neda Hejazi Jerry W. Xuan David R. Coria Erica Sawczynec Ian J. M. Crossfield Paul I. Cristofari Zhoujian Zhang Maleah Rhem Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A The Astrophysical Journal M dwarf stars |
| title | Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A |
| title_full | Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A |
| title_fullStr | Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A |
| title_full_unstemmed | Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A |
| title_short | Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A |
| title_sort | chemical links between a young m type t tauri star and its substellar companion spectral analysis and c o measurement of dh tau a |
| topic | M dwarf stars |
| url | https://doi.org/10.3847/1538-4357/ad968c |
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