Revisiting the Atmosphere of HAT-P-70b with CARMENES High-resolution Transmission Spectroscopy

Owing to hot and inflated envelopes that facilitate atmospheric studies, ultrahot Jupiters (UHJs) have attracted much attention. Significant progress has been achieved, from enlarging the sample size to broadening the studies to encompass diverse stellar types and ages. Here, we present a transmissi...

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Detalles Bibliográficos
Autores: Gan, Tianjun, Orell-Miquel, Jaume, Yan, F., Nortmann, L., Sanz-Forcada, J., Pallé, Enric, Mao, Shude, Amado, Pedro J., Caballero, J. A., Cikota, S., Cont, David, Hatzes, Artie P., Henning, Thomas, Lesjak, Fabio5, López-Puertas, Manuel, Montes, David, Morales, Juan Carlos, Peláez-Torres, A., Quirrenbach, Andreas, Reiners, Ansgar, Ribas, Ignasi, Schweitzer, Andreas
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2026
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::527bf2d1fbdbffedd66f80d8c8e66b3f
Acceso en línea:http://hdl.handle.net/10261/432279
Access Level:acceso abierto
Palabra clave:Exoplanet atmospheres
High resolution spectroscopy
Transmission spectroscopy
Hot Jupiters
Exoplanet atmospheric composition
Descripción
Sumario:Owing to hot and inflated envelopes that facilitate atmospheric studies, ultrahot Jupiters (UHJs) have attracted much attention. Significant progress has been achieved, from enlarging the sample size to broadening the studies to encompass diverse stellar types and ages. Here, we present a transmission spectroscopy study of HAT-P-70b, a UHJ orbiting a young A-type star, through high-resolution observations with CARMENES at the 3.5 m Calar Alto telescope. By using the line-by-line technique, we confirm the previous detections of Hα, Na i, and Ca ii, report a new tentative detection of K i, and impose an upper limit on the He triplet absorption. Through cross-correlation analysis, we identify the Ca ii and Fe i absorptions, both blueshifted by approximately 5 km s−1, indicating a day-to-night side atmospheric wind. Additionally, we find a new tentative detection of K i. We do not see any significant atmospheric molecular signal in the near-infrared data. Putting HAT-P-70b in the context of UHJs from the literature, it turns out that (1) Hα absorption is more common on gas giants orbiting stars younger than 1 Gyr, with a relative detection probability of PAge<1 Gyr(Hα)/PAge≥1 Gyr(Hα) ∼ 3; (2) any UHJ is likely to exhibit Fe i absorption if it has Ca ii.

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