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Confirmation of an He I evaporating atmosphere around the 650-Myr-old sub-Neptune HD 235088 b (TOI-1430 b) with CARMENES
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| Published in: | Astronomy and astrophysics year:2023; elocationid:A56; 677(2023) vom: Sept., Artikel-ID A56, Seite 1-17; month:09; extent:17; pages:1-17; volume:677 |
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| Authors and Corporations: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
| Other Authors: | Lampón, Manuel [Author] • López-Puertas, M. [Author] • Mallorquín, Manuel [Author] • Murgas, F. [Author] • Peláez-Torres, A. [Author] • Pallé, Enric [Author] • Esparza-Borges, Emma [Author] • Sanz-Forcada, J. [Author] • Tabernero, H. M. [Author] • Nortmann, Lisa [Author] • Nagel, E. [Author] • Parviainen, H. [Author] • Zapatero Osorio, Maria Rosa [Author] • Caballero, José A. 1977- [Author] • Czesla, S. [Author] • Cifuentes, C. [Author] • Morello, G. [Author] • Quirrenbach, Andreas [Author] • Amado, P. J. [Author] • Fernández-Martín, A. [Author] • Fukui, A. [Author] • Henning, Thomas 1956- [Author] • Kawauchi, K. [Author] • Leon, J. P. de [Author] • Molaverdikhani, Karan 1982- [Author] • Montes, D. [Author] • Narita, N. [Author] • Reiners, A. [Author] • Ribas, I. [Author] • Sánchez-López, A. [Author] • Schweitzer, A. [Author] • Stangret, M. [Author] • Yan, F. [Author] |
| Type of Resource: | E-Book Component Part |
| Language: | English |
| published: |
September 2023
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| Series: |
Astronomy and astrophysics, 677(2023) vom: Sept., Artikel-ID A56, Seite 1-17
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| Source: | Verbunddaten SWB Lizenzfreie Online-Ressourcen |
| ISSN: | 1432-0746 |
| Summary: | HD 235088 (TOI-1430) is a young star known to host a sub-Neptune-sized planet candidate. We validated the planetary nature of HD 235088 b with multiband photometry, refined its planetary parameters, and obtained a new age estimate of the host star, placing it at 600-800 Myr. Previous spectroscopic observations of a single transit detected an excess absorption of He I coincident in time with the planet candidate transit. Here, we confirm the presence of He I in the atmosphere of HD 235088 b with one transit observed with CARMENES. We also detected hints of variability in the strength of the helium signal, with an absorption of −0.91 ± 0.11%, which is slightly deeper (2<i>σ<i/>) than the previous measurement. Furthermore, we simulated the He I signal with a spherically symmetric 1D hydrodynamic model, finding that the upper atmosphere of HD 235088 b escapes hydrodynamically with a significant mass loss rate of (1.5−5) × 10<sup>10<sup/> g s<sup>−1<sup/> in a relatively cold outflow, with <i>T<i/> = 3125 ±375 K, in the photon-limited escape regime. HD 235088 b (<i>R<i/><sub>p<sub/> = 2.045 ± 0.075 <i>R<i/><sub>⊕<sub/>) is the smallest planet found to date with a solid atmospheric detection - not just of He I but any other atom or molecule. This positions it a benchmark planet for further analyses of evolving young sub-Neptune atmospheres. |
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| Item Description: |
Gesehen am 23.04.2024 Online veröffentlicht: 05. September 2023 |
| Physical Description: |
Illustrationen 17 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202346445 |