Direct Imaging Detection of the Protoplanet AB Aurigae b at Wavelengths Covering Pa$β$: Rebuttal to Biddle et al. (2024)
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| Format: | Preprint |
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2024
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| _version_ | 1866909225117024256 |
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| author | Currie, Thayne |
| author_facet | Currie, Thayne |
| contents | Recently, Biddle et al. (2024) claimed a non-detection of the protoplanet AB Aurigae b in Keck/NIRC2 Pa$β$ imaging. I reprocess these newly-public data and compare them to data from the extreme AO platform (SCExAO/CHARIS) used to discover AB Aur b. AB Aur b is decisively imaged with SCExAO/CHARIS at wavelengths covering Pa$β$. The Biddle et al. non detection of AB Aur b results from a far poorer image quality that is non competitive with SCExAO/CHARIS. Their contrast limits and thus constraints on accretion are overestimated due to an inaccurate AB Aur b source model. Consequentially, the revised Pa$β$ 2-$σ$ upper limit from these data is about three times higher than previously reported. Irrespective of image quality, single-band Pa$β$ imaging is ill suited to conclusively identifying accretion onto AB Aur b. Instead, high-resolution H$α$ spectroscopy may provide accretion signatures. Aside from PDS 70, AB Aurigae remains the system with the strongest evidence for having a directly-imaged protoplanet. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_00107 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct Imaging Detection of the Protoplanet AB Aurigae b at Wavelengths Covering Pa$β$: Rebuttal to Biddle et al. (2024) Currie, Thayne Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Recently, Biddle et al. (2024) claimed a non-detection of the protoplanet AB Aurigae b in Keck/NIRC2 Pa$β$ imaging. I reprocess these newly-public data and compare them to data from the extreme AO platform (SCExAO/CHARIS) used to discover AB Aur b. AB Aur b is decisively imaged with SCExAO/CHARIS at wavelengths covering Pa$β$. The Biddle et al. non detection of AB Aur b results from a far poorer image quality that is non competitive with SCExAO/CHARIS. Their contrast limits and thus constraints on accretion are overestimated due to an inaccurate AB Aur b source model. Consequentially, the revised Pa$β$ 2-$σ$ upper limit from these data is about three times higher than previously reported. Irrespective of image quality, single-band Pa$β$ imaging is ill suited to conclusively identifying accretion onto AB Aur b. Instead, high-resolution H$α$ spectroscopy may provide accretion signatures. Aside from PDS 70, AB Aurigae remains the system with the strongest evidence for having a directly-imaged protoplanet. |
| title | Direct Imaging Detection of the Protoplanet AB Aurigae b at Wavelengths Covering Pa$β$: Rebuttal to Biddle et al. (2024) |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2406.00107 |