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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.04723 |
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| _version_ | 1866914882285207552 |
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| author | Nogueira, P. H. Lazzoni, C. Zurlo, A. Bhowmik, T. Donoso-Oliva, C. Desidera, S. Milli, J. Pérez, S. Delorme, P. Fernadez, A. Langlois, M. Petrus, S. Cabrera-Vives, G. Chauvin, G. |
| author_facet | Nogueira, P. H. Lazzoni, C. Zurlo, A. Bhowmik, T. Donoso-Oliva, C. Desidera, S. Milli, J. Pérez, S. Delorme, P. Fernadez, A. Langlois, M. Petrus, S. Cabrera-Vives, G. Chauvin, G. |
| contents | $η$ Tel is an 18 Myr system with a 2.09 M$_{\odot}$ A-type star and an M7-M8 brown dwarf companion, $η$ Tel B, separated by 4.2'' (208 au). High-contrast imaging campaigns over 20 years have enabled orbital and photometric characterization. $η$ Tel B, bright and on a wide orbit, is ideal for detailed examination.
We analyzed three new SPHERE/IRDIS coronagraphic observations to explore $η$ Tel B's orbital parameters, contrast, and surroundings, aiming to detect a circumplanetary disk or close companion. Reduced IRDIS data achieved a contrast of 1.0$\times 10^{-5}$, enabling astrometric measurements with uncertainties of 4 mas in separation and 0.2 degrees in position angle, the smallest so far.
With a contrast of 6.8 magnitudes in the H band, $η$ Tel B's separation and position angle were measured as 4.218'' and 167.3 degrees, respectively. Orbital analysis using Orvara code, considering Gaia-Hipparcos acceleration, revealed a low eccentric orbit (e $\sim$ 0.34), inclination of 81.9 degrees, and semi-major axis of 218 au. $η$ Tel B's mass was determined to be 48 \MJup, consistent with previous calculations.
No significant residual indicating a satellite or disk around $η$ Tel B was detected. Detection limits ruled out massive objects around $η$ Tel B with masses down to 1.6 \MJup at a separation of 33 au. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_04723 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Astrometric and photometric characterization of $η$ Tel B combining two decades of observations Nogueira, P. H. Lazzoni, C. Zurlo, A. Bhowmik, T. Donoso-Oliva, C. Desidera, S. Milli, J. Pérez, S. Delorme, P. Fernadez, A. Langlois, M. Petrus, S. Cabrera-Vives, G. Chauvin, G. Solar and Stellar Astrophysics Earth and Planetary Astrophysics $η$ Tel is an 18 Myr system with a 2.09 M$_{\odot}$ A-type star and an M7-M8 brown dwarf companion, $η$ Tel B, separated by 4.2'' (208 au). High-contrast imaging campaigns over 20 years have enabled orbital and photometric characterization. $η$ Tel B, bright and on a wide orbit, is ideal for detailed examination. We analyzed three new SPHERE/IRDIS coronagraphic observations to explore $η$ Tel B's orbital parameters, contrast, and surroundings, aiming to detect a circumplanetary disk or close companion. Reduced IRDIS data achieved a contrast of 1.0$\times 10^{-5}$, enabling astrometric measurements with uncertainties of 4 mas in separation and 0.2 degrees in position angle, the smallest so far. With a contrast of 6.8 magnitudes in the H band, $η$ Tel B's separation and position angle were measured as 4.218'' and 167.3 degrees, respectively. Orbital analysis using Orvara code, considering Gaia-Hipparcos acceleration, revealed a low eccentric orbit (e $\sim$ 0.34), inclination of 81.9 degrees, and semi-major axis of 218 au. $η$ Tel B's mass was determined to be 48 \MJup, consistent with previous calculations. No significant residual indicating a satellite or disk around $η$ Tel B was detected. Detection limits ruled out massive objects around $η$ Tel B with masses down to 1.6 \MJup at a separation of 33 au. |
| title | Astrometric and photometric characterization of $η$ Tel B combining two decades of observations |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2405.04723 |