Modeling of Archean Earth-like aquaplanets atmospheres: the effect of obliquity on habitability and observables of exoplanets.
Loading...
Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad de Concepción
Abstract
La búsqueda y observación de exoplanetas habitables similares a la Tierra, así como la interpretación de estas observaciones, se han convertido en temas centrales de la astronomía actual. Nuestro objetivo es investigar la interacción entre la oblicuidad planetaria, la termodinámica atmosférica y los procesos hidrológicos, y su impacto en la habitabilidad y las propiedades espectroscópicas de los acuaplanetas con una composición atmosférica similar a la de la Tierra Arcaica. Utilizando un modelo de circulación general (GCM) y modelos de transferencia radiativa (RT) para simulaciones atmosféricas y de espectros de emisión, modelamos diez acuaplanetas con atmósfera similar a la de la Tierra Arcaica con oblicuidades variables. La habitabilidad se analiza a través de la temperatura de la superficie del mar (TS) y la temperatura del bulbo húmedo (TW). Se analiza el espectro de emisión para determinar los cambios debidos al efecto de la oblicuidad. Nuestros resultados confirman que la oblicuidad influye significativamente en su termodinámica atmosférica, la habitabilidad de la superficie y los espectros de emisión observables para el caso sin nubes. En particular, los rasgos de absorción de vapor de agua de 2.7 y 6.0 µm en escenarios sin nubes se correlacionaron con TW para oblicuidades mayores o iguales a 52.5o. Nuestros hallazgos proporcionan información sobre las posibles características climáticas y espectrales de las atmósferas de tipo Arcaico relacionadas con la oblicuidad, ofreciendo una base para interpretar las observaciones de exoplanetas. Estos resultados podrían servir de base para futuras misiones telescópicas y contribuir al desarrollo de métodos para estimar la oblicuidad y la habitabilidad de exoplanetas a partir de datos espectroscópicos.
The search for and observation of habitable Earth-like exoplanets, as well as the interpretation of these observations, have become central topics in astronomy today. We aim to investigate the interplay between planetary obliquity, atmospheric thermodynamics, and hydrological processes, and their impact on the habitability and spectroscopic properties of aquaplanets with an Archean Earth-like atmospheric composition. Using a General Circulation Model (GCM) and radiative transfer (RT) for atmospheric and emission spectra simulations, we modeled ten aquaplanets with Archean Earth-like atmosphere with varying obliquities. Habitability is analyzed through the Sea Surface Temperature (TS) and the Wet Bulb Temperature (TW). Emission spectrum is analyzed to determine the changes due to the effect of obliquity. Our results confirm that the obliquity significantly influences its atmospheric thermodynamics, surface habitability, and observable emission spectra for cloudless case. Notably, the 2.7 and 6.0 µm water vapor absorption features in cloudless scenarios correlated with TW for obliquities greater than or equal to 52.5o. Our findings provide insights into the potential climatic and spectral characteristics of Archean-like atmospheres related with obliquity, offering a basis for interpreting exoplanet observations. These results could inform future telescope missions and aid in the development of methods to estimate exoplanetary obliquity and habitability from spectroscopic data.
The search for and observation of habitable Earth-like exoplanets, as well as the interpretation of these observations, have become central topics in astronomy today. We aim to investigate the interplay between planetary obliquity, atmospheric thermodynamics, and hydrological processes, and their impact on the habitability and spectroscopic properties of aquaplanets with an Archean Earth-like atmospheric composition. Using a General Circulation Model (GCM) and radiative transfer (RT) for atmospheric and emission spectra simulations, we modeled ten aquaplanets with Archean Earth-like atmosphere with varying obliquities. Habitability is analyzed through the Sea Surface Temperature (TS) and the Wet Bulb Temperature (TW). Emission spectrum is analyzed to determine the changes due to the effect of obliquity. Our results confirm that the obliquity significantly influences its atmospheric thermodynamics, surface habitability, and observable emission spectra for cloudless case. Notably, the 2.7 and 6.0 µm water vapor absorption features in cloudless scenarios correlated with TW for obliquities greater than or equal to 52.5o. Our findings provide insights into the potential climatic and spectral characteristics of Archean-like atmospheres related with obliquity, offering a basis for interpreting exoplanet observations. These results could inform future telescope missions and aid in the development of methods to estimate exoplanetary obliquity and habitability from spectroscopic data.
Description
Tesis presentada para optar al grado académico de Magíster en Astronomía
Keywords
Exobiología, Planetas externos Atmósferas, Planetas Superficies