Upper limits on atmospheric abundances of KELT-11b and WASP-69b from a retrieval approach
Year: 2025
Type: article
Abstract: 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 H 2 O signal for KELT-11 b but not for WASP-69 b, and searches for other molecules such as H 2 S and CH 4 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.
Source: Astronomy and Astrophysics
Institutions: Leibniz Institute for Astrophysics Potsdam, University of Göttingen, Excellence Cluster Origins, Ludwig-Maximilians-Universität München, Consejo Superior de Investigaciones Científicas, Instituto de Astrofísica de Andalucía, Calar Alto Observatory, Centro de Astrobiología, Thüringer Landessternwarte Tautenburg, Max Planck Institute for Astronomy, Universidad Complutense de Madrid, The University of Texas at Austin, Universidad de La Laguna, Instituto de Astrofísica de Canarias, Heidelberg University, Institute of Space Sciences, Institut d'Estudis Espacials de Catalunya, University of Science and Technology of China
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Funders: European Commission, Deutsche Forschungsgemeinschaft, Universidad Complutense de Madrid, Ministerio de Economía y Competitividad, Max-Planck-Gesellschaft, Ministerio de Ciencia e Innovación, Klaus Tschira Stiftung, Junta de Andalucía, Instituto de Astrofísica de Andalucía, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Canarias, Consejo Superior de Investigaciones Científicas, European Regional Development Fund, Agencia Estatal de Investigación
Awards: G1089506725, G1092424111, G1171257612, G1175115578, G1353885700, G1381791653, G1855990336, G1877798660, G195395952, G2030784793, G2262748287, G2309174360, G2313451655, G2499501003, G2601397997, G2627485041, G2633884080, G2660406951, G2690211755, G278595929, G300979063, G302750986, G3181696191, G3413881215, G3439265645, G3480869486, G3518538256, G3681454997, G3817602061, G4042783231, G4066435496, G410571670, G4190160184, G425668148, G430777504, G451917667, FOR 2544: Blaue Planeten bei Roten Sternen das Forschungsprogramm des CARMENES Projekts, G463062595, G4811957025, G5080475149, G5195188938, G5421974903, G5539308778, G5654724244, G5845768719, G5894067328, G5967599077, G6080697404, G617610489, G6180974586, G6326031618, G7084143925, G7130151326, G7434936867, G7840098671, G8304717208, G8430294048, G855041801, G8662767329, G869884560, G8739736297, G8920660035, G99296377
OpenAlex ID: W4415971500