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Orell-Miquel, J.; Lampón, M.; López-Puertas, M.; Mallorquín, M.; Murgas, F.; Peláez-Torres, A.; Pallé, E.; Esparza-Borges, E.; Sanz-Forcada, J.; Tabernero, H. M.; Nortmann, L.; Nagel, E.; Parviainen, H.; Zapatero Osorio, M. R.; Caballero, J. A.; Czesla, S.; Cifuentes, C.; Morello, G.; Quirrenbach, A.; Amado, P. J.; Fernández-Martín, A.; Fukui, A.; Henning, Th; Kawauchi, K.; de Leon, J. P.; Molaverdikhani, K.; Montes, D.; Narita, N.; Reiners, A.; Ribas, I.; Sánchez-López, A.; Schweitzer, A.; Stangret, M.; Yan, F.
Astronomy and astrophysics (Berlin), 09/2023, Letnik: 677Journal Article
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 σ ) 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 10 g s −1 in a relatively cold outflow, with T = 3125 ±375 K, in the photon-limited escape regime. HD 235088 b ( R p = 2.045 ± 0.075 R ⊕ ) 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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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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