Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars
An accurate estimation of the continuum excess emission from accretion spots and inner circumstellar disk regions is crucial for a proper derivation of fundamental stellar parameters in accreting systems. However, the presence of starspots can make disentangling the complicated multicomponent emissi...
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| Format: | Article |
| Language: | English |
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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/ad93c6 |
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| author | Facundo Pérez Paolino Jeffrey S. Bary Lynne A. Hillenbrand Madison Markham William J. Fischer |
| author_facet | Facundo Pérez Paolino Jeffrey S. Bary Lynne A. Hillenbrand Madison Markham William J. Fischer |
| author_sort | Facundo Pérez Paolino |
| collection | DOAJ |
| description | An accurate estimation of the continuum excess emission from accretion spots and inner circumstellar disk regions is crucial for a proper derivation of fundamental stellar parameters in accreting systems. However, the presence of starspots can make disentangling the complicated multicomponent emission in these systems challenging. Subtraction of a single-temperature spectral template is insufficient to account for the composite stellar emission, as we demonstrated in a recent campaign involving weak-lined T Tauri stars. Here, we model the moderate-resolution near-infrared spectra of classical T Tauri stars, presenting new spectral models that incorporate spotted stars plus emission from accretion hot spots and a warm inner disk, allowing us to simultaneously reconstruct the entire 0.8–2.4 μ m spectrum of our 16 targets. Using these models, we re-derive the continuum excess emission. Our results indicate that accounting for starspots resolves the need to include a previously proposed intermediate-temperature component in the IYJ excess and highlights the importance of a proper treatment of starspots in studies of accreting low-mass stars. |
| format | Article |
| id | doaj-art-e41bb7c76d1e4305ab1d4c2a715a4eea |
| 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-e41bb7c76d1e4305ab1d4c2a715a4eea2024-12-23T09:30:44ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197813210.3847/1538-4357/ad93c6Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri StarsFacundo Pérez Paolino0https://orcid.org/0000-0002-4128-7867Jeffrey S. Bary1https://orcid.org/0000-0001-8642-5867Lynne A. Hillenbrand2Madison Markham3https://orcid.org/0009-0000-9670-2194William J. Fischer4https://orcid.org/0000-0002-3747-2496Colgate University , 13 Oak Drive, Hamilton, NY 13346, USA ; fperezpa@caltech.edu; Department of Astronomy, California Institute of Technology , Pasadena, CA 91125, USAColgate University , 13 Oak Drive, Hamilton, NY 13346, USA ; fperezpa@caltech.eduDepartment of Astronomy, California Institute of Technology , Pasadena, CA 91125, USAColgate University , 13 Oak Drive, Hamilton, NY 13346, USA ; fperezpa@caltech.eduSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USAAn accurate estimation of the continuum excess emission from accretion spots and inner circumstellar disk regions is crucial for a proper derivation of fundamental stellar parameters in accreting systems. However, the presence of starspots can make disentangling the complicated multicomponent emission in these systems challenging. Subtraction of a single-temperature spectral template is insufficient to account for the composite stellar emission, as we demonstrated in a recent campaign involving weak-lined T Tauri stars. Here, we model the moderate-resolution near-infrared spectra of classical T Tauri stars, presenting new spectral models that incorporate spotted stars plus emission from accretion hot spots and a warm inner disk, allowing us to simultaneously reconstruct the entire 0.8–2.4 μ m spectrum of our 16 targets. Using these models, we re-derive the continuum excess emission. Our results indicate that accounting for starspots resolves the need to include a previously proposed intermediate-temperature component in the IYJ excess and highlights the importance of a proper treatment of starspots in studies of accreting low-mass stars.https://doi.org/10.3847/1538-4357/ad93c6StarspotsPre-main sequence starsEarly stellar evolutionStar formationStellar accretion |
| spellingShingle | Facundo Pérez Paolino Jeffrey S. Bary Lynne A. Hillenbrand Madison Markham William J. Fischer Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars The Astrophysical Journal Starspots Pre-main sequence stars Early stellar evolution Star formation Stellar accretion |
| title | Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars |
| title_full | Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars |
| title_fullStr | Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars |
| title_full_unstemmed | Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars |
| title_short | Starspots as an Explanation for the Mysterious IYJ Continuum Excess Emission in Classical T Tauri Stars |
| title_sort | starspots as an explanation for the mysterious iyj continuum excess emission in classical t tauri stars |
| topic | Starspots Pre-main sequence stars Early stellar evolution Star formation Stellar accretion |
| url | https://doi.org/10.3847/1538-4357/ad93c6 |
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