Revisiting the ultraviolet spectroscopy of the eta Tel edge-on debris disk
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arXiv
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2026
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| author | Youngblood, Allison Brandeker, Alexis Perez, Sebastian Roberge, Aki Weinberger, Alycia MacGregor, Meredith A. Welsh, Barry |
| author_facet | Youngblood, Allison Brandeker, Alexis Perez, Sebastian Roberge, Aki Weinberger, Alycia MacGregor, Meredith A. Welsh, Barry |
| contents | We revisit the ultraviolet absorption spectroscopy of the edge-on debris disk surrounding the A0V star $η$ Telescopii. Previous work found absorption components at four velocities ($\sim$ -23, -18, -10, -1 km s$^{-1}$), with the most blueshifted component (-23 km s$^{-1}$) interpreted as a likely disk wind. However, optical spectroscopy of $η$ Tel and other nearby stars in projection demonstrate that the -23 km s$^{-1}$ component is likely interstellar in origin. We find that there are three interstellar components toward this sight line (-23, -18, -10 km s$^{-1}$), but that the fourth component near -1 km s$^{-1}$, which was only detected in O I, is inconsistent with an interstellar origin and could be circumstellar. We place a 3-$σ$ upper limit on the C/O ratio of the -1 km s$^{-1}$ gas (log C/O $<$ -2.1), finding that it is consistent with Earth and solar system comet abundances. However, the abundance is inconsistent with the carbon-rich disks of $β$ Pic (A5V) and 49 Cet (A1V), probably because $η$ Tel (A0V) is a warmer star imposing greater levels of radiation pressure on carbon atoms in the disk. A low C/O ratio is also inconsistent with Herschel's [CII] detection toward $η$ Tel and may indicate that carbon gas is misaligned from the line of sight or variable in time. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_12627 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Revisiting the ultraviolet spectroscopy of the eta Tel edge-on debris disk Youngblood, Allison Brandeker, Alexis Perez, Sebastian Roberge, Aki Weinberger, Alycia MacGregor, Meredith A. Welsh, Barry Earth and Planetary Astrophysics Solar and Stellar Astrophysics We revisit the ultraviolet absorption spectroscopy of the edge-on debris disk surrounding the A0V star $η$ Telescopii. Previous work found absorption components at four velocities ($\sim$ -23, -18, -10, -1 km s$^{-1}$), with the most blueshifted component (-23 km s$^{-1}$) interpreted as a likely disk wind. However, optical spectroscopy of $η$ Tel and other nearby stars in projection demonstrate that the -23 km s$^{-1}$ component is likely interstellar in origin. We find that there are three interstellar components toward this sight line (-23, -18, -10 km s$^{-1}$), but that the fourth component near -1 km s$^{-1}$, which was only detected in O I, is inconsistent with an interstellar origin and could be circumstellar. We place a 3-$σ$ upper limit on the C/O ratio of the -1 km s$^{-1}$ gas (log C/O $<$ -2.1), finding that it is consistent with Earth and solar system comet abundances. However, the abundance is inconsistent with the carbon-rich disks of $β$ Pic (A5V) and 49 Cet (A1V), probably because $η$ Tel (A0V) is a warmer star imposing greater levels of radiation pressure on carbon atoms in the disk. A low C/O ratio is also inconsistent with Herschel's [CII] detection toward $η$ Tel and may indicate that carbon gas is misaligned from the line of sight or variable in time. |
| title | Revisiting the ultraviolet spectroscopy of the eta Tel edge-on debris disk |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2605.12627 |