Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST
We present the analysis of 16 classical T Tauri stars (CTTSs) using LAMOST and TESS data, investigating spectral properties, photometric variations, and mass accretion rates. All 16 stars exhibit emissions in H α lines, from which the average mass accretion rate of 1.76 × 10 ^−9 M _⊙ yr ^−1 is deriv...
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| Format: | Article |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ace322 |
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| author | Chia-Lung Lin Wing-Huen Ip Yao Hsiao Tzu-Heng Chang Yi-han Song A-Li Luo |
| author_facet | Chia-Lung Lin Wing-Huen Ip Yao Hsiao Tzu-Heng Chang Yi-han Song A-Li Luo |
| author_sort | Chia-Lung Lin |
| collection | DOAJ |
| description | We present the analysis of 16 classical T Tauri stars (CTTSs) using LAMOST and TESS data, investigating spectral properties, photometric variations, and mass accretion rates. All 16 stars exhibit emissions in H α lines, from which the average mass accretion rate of 1.76 × 10 ^−9 M _⊙ yr ^−1 is derived. Two of the stars, DL Tau and Haro 6-13, show mass accretion bursts simultaneously in TESS, ASAS-SN, and/or the ZTF survey. Based on these observations, we find that the mass accretion rates of DL Tau and Haro 6-13 reach their maxima of 2.5 × 10 ^−8 M _⊙ yr ^−1 and 2 × 10 ^−10 M _⊙ yr ^−1 , respectively, during the TESS observation. We detect 13 flares among these stars. The flare frequency distribution shows that the CTTSs’ flare activity is not only dominated by strong flares with high energy but also much more active than those of solar-type and young low-mass stars. By comparing the variability classes reported in the literature, we find that the transition timescale between different classes of variability in CTTSs, such as from stochastic (S) to bursting (B) or from quasi-periodic symmetric to quasi-periodic dipping, may range from 1.6 to 4 yr. We observe no significant correlation between inclination and mass accretion rates derived from the emission indicators. This suggests that inner disk properties may be more important than those of outer disks. Finally, we find a relatively significant positive correlation between the asymmetric metric M and the cold disk inclination compared to the literature. A weak negative correlation between the periodicity metric Q value and inclination has also been found. |
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| language | English |
| last_indexed | 2025-03-21T05:39:30Z |
| publishDate | 2023-01-01 |
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| series | The Astronomical Journal |
| spelling | doaj.art-5378ce23d1a24bb7b90ce9e08f5555a12024-07-24T11:52:08ZengIOP PublishingThe Astronomical Journal1538-38812023-01-0116638210.3847/1538-3881/ace322Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOSTChia-Lung Lin0https://orcid.org/0000-0001-5989-7594Wing-Huen Ip1https://orcid.org/0000-0002-3140-5014Yao Hsiao2https://orcid.org/0000-0002-8915-8538Tzu-Heng Chang3https://orcid.org/0000-0002-6778-6517Yi-han Song4https://orcid.org/0000-0001-7255-5003A-Li Luo5https://orcid.org/0000-0001-7865-2648Graduate Institute of Astronomy, National Central University , Taoyuan 32001, TaiwanGraduate Institute of Astronomy, National Central University , Taoyuan 32001, Taiwan; Graduate Institute of Space Science, National Central University , Taoyuan 32001, TaiwanGraduate Institute of Astronomy, National Central University , Taoyuan 32001, TaiwanGraduate Institute of Astronomy, National Central University , Taoyuan 32001, TaiwanKey Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People’s Republic of ChinaKey Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People’s Republic of ChinaWe present the analysis of 16 classical T Tauri stars (CTTSs) using LAMOST and TESS data, investigating spectral properties, photometric variations, and mass accretion rates. All 16 stars exhibit emissions in H α lines, from which the average mass accretion rate of 1.76 × 10 ^−9 M _⊙ yr ^−1 is derived. Two of the stars, DL Tau and Haro 6-13, show mass accretion bursts simultaneously in TESS, ASAS-SN, and/or the ZTF survey. Based on these observations, we find that the mass accretion rates of DL Tau and Haro 6-13 reach their maxima of 2.5 × 10 ^−8 M _⊙ yr ^−1 and 2 × 10 ^−10 M _⊙ yr ^−1 , respectively, during the TESS observation. We detect 13 flares among these stars. The flare frequency distribution shows that the CTTSs’ flare activity is not only dominated by strong flares with high energy but also much more active than those of solar-type and young low-mass stars. By comparing the variability classes reported in the literature, we find that the transition timescale between different classes of variability in CTTSs, such as from stochastic (S) to bursting (B) or from quasi-periodic symmetric to quasi-periodic dipping, may range from 1.6 to 4 yr. We observe no significant correlation between inclination and mass accretion rates derived from the emission indicators. This suggests that inner disk properties may be more important than those of outer disks. Finally, we find a relatively significant positive correlation between the asymmetric metric M and the cold disk inclination compared to the literature. A weak negative correlation between the periodicity metric Q value and inclination has also been found.https://doi.org/10.3847/1538-3881/ace322Star formationYoung stellar objectsLow mass starsClassical T Tauri starsStellar flares |
| spellingShingle | Chia-Lung Lin Wing-Huen Ip Yao Hsiao Tzu-Heng Chang Yi-han Song A-Li Luo Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST The Astronomical Journal Star formation Young stellar objects Low mass stars Classical T Tauri stars Stellar flares |
| title | Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST |
| title_full | Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST |
| title_fullStr | Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST |
| title_full_unstemmed | Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST |
| title_short | Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST |
| title_sort | mass accretion spectral and photometric properties of t tauri stars in taurus based on tess and lamost |
| topic | Star formation Young stellar objects Low mass stars Classical T Tauri stars Stellar flares |
| url | https://doi.org/10.3847/1538-3881/ace322 |
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