Proyecto de Investigación: ENTENDIENDO LAS ENANAS FRIAS Y SUS SISTEMAS PLANETARIOS
Cargando...
Colaboradores
Financiadores
ID
PID2022-137241NB-C43
Autores
Publicaciones
Upper limits on atmospheric abundances of KELT-11b and WASP-69b from a retrieval approach
(EDP Sciences, 2025-12-12) Lesjak, F.; Nortmann, L.; Cont, D. 1 Conti, D; Amado, P. J.; Azzaro, M.; Caballero, J. A.; Czesla, S.; Hatzes, Artie; Henning, T.; López Puertas, M.; Molaverdikhani, K.; Montes, D.; Orell-Miquel, Jaume; Pallé, E.; Peláez-Torres, A.; Quirrenbach, A.; Reiners, A.; Ribas, I.; Sánchez López, A.; Schweitzer, A.; Yan, F.; Ministerio de Economía y Competitividad (MINECO); Deutsche Forschungsgemeinschaft (DFG); Agencia Estatal de Investigación (AEI); European Research Council (ERC)
Context. WASP-69 b and KELT-11 b are two low-density hot Jupiters, which are expected to show strong atmospheric features in their transmission spectra. Such features offer valuable insights into the chemical composition, thermal structure, and cloud properties of exoplanet atmospheres. High-resolution spectroscopic observations can be used to study the line-forming regions in exoplanet atmospheres and potentially detect signals despite the presence of clouds.
Aims. We aimed to detect various molecular species and constrain the chemical abundances and cloud deck pressures using high-resolution spectroscopy.
Methods. We observed multiple transits of these planets with CARMENES and applied the cross-correlation method to detect atmospheric signatures. Further, we used an injection-recovery approach and retrievals to place constraints on the atmospheric properties.
Results. We detected a tentative H2O signal for KELT-11 b but not for WASP-69 b, and searches for other molecules such as H2S and CH4 resulted in non-detections for both planets. By investigating the signal strength of injected synthetic models, we constrained which atmospheric abundances and cloud deck pressures are consistent with our cross-correlation results. In addition, we show that a retrieval-based approach leads to similar constraints of these parameters.
A transiting rocky super-Earth and a non-transiting sub-Neptune orbiting the M dwarf TOI-771
(EDP Sciences, 2025-06-20) Lacedelli, G.; Pallé, E.; Davis, Yasmin T.; Luque, R. ; Morello, G.; Tabernero, H. M.; Zapatero Osorio, María Rosa; Pozuelos, F. J.; Jankowski, Dawid; Nowak, G.; Murgas Alcaino, F.; Orell-Miquel, Jaume; Akana Murphy, Joseph M.; Barkaoui, K.; Charbonneau, D.; Dransfield, G.; Ducrot, E.; Geraldía González, Samuel; Irwin, J.; Jehin, E.; Osborne, H. L. M.; Pedersen, P. P.; Rackham, B. V. , P. P.; Scott, Madison Grace; Timmermans, M.; Triaud, A.; Van Eylen, V.; Agencia Estatal de Investigación (AEI); National Aeronautics and Space Administration (NASA); European Research Council (ERC); European Commission (EC); Science and Technology Facilities Council (STFC); Belgian National Fund for Scientific Research (FNRS); National Science Foundation (NSF)
[Context] The origin and evolution of the sub-Neptune population is a highly debated topic in the exoplanet community. With the advent of JWST, atmospheric studies can now put unprecedented constraints on the internal composition of this population. In this context, the THIRSTEE project aims to investigate the population properties of sub-Neptunes with a comprehensive and demographic approach, providing a homogeneous sample of precisely characterised sub-Neptunes across stellar spectral types.
[Aims] We present here the precise characterisation of the planetary system orbiting one of the THIRSTEE M-dwarf targets, TOI-771 (d = 25 pc, V = 14.9 mag), known to host one planet, TOI-771 b, which has been statistically validated using TESS observations.
[Methods] We use TESS, SPECULOOS, TRAPPIST, and M-Earth photometry together with 31 high-precision ESPRESSO radial velocities to derive the orbital parameters and investigate the internal composition of TOI-771 b, as well as exploring the presence of additional companions in the system.
[Results] We derived the precise mass and radius for TOI-771 b, a super-Earth with Rb = 1.36 ± 0.10 R⊕ and Mb = 2.47−0.31+0.32M⊕ orbiting every 2.3 days around its host star. Its composition is consistent with an Earth-like planet, and it adds up to the rocky population of subNeptunes lying below the density gap identified around M dwarfs. With a ∼ 13% precision in mass, a∼ 7% radius precision, and a warm equilibrium temperature of Teq =543K, TOI-771 b is a particularly interesting target for atmospheric characterisation with JWST, and it is indeed one of the targets under consideration for the Rocky World DDT programme. Additionally, we discover the presence of a second, non-transiting planet in the system, TOI-771 c, with a period of 7.61 days and a minimum mass of Mp sin i = 2.87−0.38+0.41M⊕. Even though the inclination is not directly constrained, the planet likely belongs to the temperate sub-Neptune population, with an equilibrium temperature of ∼ 365K.
