Article
Astronomy & Astrophysics
Aaron David Schneider, Ludmila Carone, Leen Decin, Uffe Grae Jorgensen, Paul Molliere, Robin Baeyens, Sven Kiefer, Christiane Helling
Summary: Simulations with a 3D general circulation model suggest that the observed radius inflation in hot Jupiters may be driven by the downward advection of energy from the photosphere into deeper layers. The study compares the dynamical heat transport in a non-inflated hot Jupiter and a canonical inflated hot Jupiter, and finds differences in the deep temperature profile and flow structures between the two planets.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
O. Carrion-Gonzalez, A. Garcia Munoz, N. C. Santos, J. Cabrera, Sz. Csizmadia, H. Rauer
Summary: Observing exoplanets at multiple phase angles is crucial for characterizing their atmospheres and planet sizes. Single-phase observations are unable to determine the presence of clouds in the atmosphere, but combining small and large phase angles can break parameter degeneracies and provide more accurate results. The shape of the scattering phase function of cloud aerosols plays a key role in the improvement of multi-phase retrievals.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Aaron David Schneider, Ludmila Carone, Leen Decin, Uffe Grae Jorgensen, Christiane Helling
Summary: Studying ultra-hot Jupiter WASP-76 b, it is concluded that the coupling between radiation and dynamics alone cannot explain the abnormally large radii of inflated hot gas giants.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
R. J. Ridgway, M. Zamyatina, N. J. Mayne, J. Manners, F. H. Lambert, M. Braam, B. Drummond, E. Hebrard, P. Palmer, K. Kohary
Summary: Stellar flares and coronal mass ejections from M dwarf stars have significant impacts on the habitability and atmospheric composition of terrestrial planets. This study used a general circulation model coupled with a photochemical kinetics scheme to examine the response of an Earth-like atmosphere to these events. The research found that stellar flares increase ozone levels in the atmosphere and coronal mass ejections generate potential bio-signatures. However, the changes in atmospheric composition also reduce the amount of harmful ultraviolet light reaching the planetary surface.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Oscar Carrion-Gonzalez, Raphael Moreno, Emmanuel Lellouch, Thibault Cavalie, Sandrine Guerlet, Gwenael Milcareck, Aymeric Spiga, Noe Clement, Jeremy Leconte
Summary: This study aims to directly measure wind speeds in Neptune's stratosphere using ALMA Doppler spectroscopy. The results show that the measured wind speeds at different pressure levels are weaker compared to previous observations. These are the first direct Doppler wind measurements performed on the Icy Giants, providing a new method for the study and monitoring of their stratospheric dynamics.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
G. Mahapatra, F. Abiad, L. Rossi, D. M. Stam
Summary: It is possible to distinguish between terrestrial exoplanets in different evolutionary phases by analyzing the polarization characteristics of the reflected starlight. However, current polarimeters are unable to discern the evolutionary phases of spatially unresolved terrestrial exoplanets.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Katy L. Chubb, Marco Rocchetto, Sergei N. Yurchenko, Michiel Min, Ingo Waldmann, Joanna K. Barstow, Paul Molliere, Ahmed F. Al-Refaie, Mark W. Phillips, Jonathan Tennyson
Summary: The ExoMolOP database contains opacity data for over 80 species of molecules of astrophysical interest, suitable for characterizing high-temperature exoplanets or cool stellar and substellar atmospheres. The data are formatted in different ways for different exoplanet atmosphere retrieval codes.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Matthaus Schulik, Richard A. Booth
Summary: We present a new 1D multiphysics simulation code for hydrodynamic escape problems and planetary accretion models. The code treats multiple species as separate hydrodynamic fields, couples them via friction laws, and allows for multiband flux-limited radiation transport. The code demonstrates correct physical behavior and offers new applications for exploring advanced planetary evolution schemes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Marco Pezzella, Jonathan Tennyson, Sergei N. Yurchenko
Summary: Photon initiated chemistry plays a crucial role in the evolution of exoplanetary atmospheres. This paper presents temperature-dependent photodissociation cross-sections and rates for hydrogen chloride and hydrogen fluoride, investigating the impact of atmospheric temperature and radiation fields on photodissociation. The results show that the photodissociation rate is highly dependent on temperature and the radiation model used for cool stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Rui Chang, Honglei Lin, Wei Yang, Renhao Ruan, Xiaoying Liu, Heng-Ci Tian, Jiafei Xu
Summary: China's CE5 mission obtained lunar soil samples and in situ spectra, enabling comparison with laboratory analysis of the same sample. Reflectance spectra measurements of the CE5 soil and two size fractions (<45 and 45-355 μm) at various phase angles revealed that in situ photometric experiments are necessary for spectral exploration on the Moon. The <45-μm fraction showed closer scattering properties to the in situ spectral data, suggesting it may be more representative of pristine lunar soil.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Joost P. Wardenier, Vivien Parmentier, Michael R. Line, Elspeth K. H. Lee
Summary: Ultra-hot Jupiters have complex atmospheres with strong spatial variations in temperature, chemistry, dynamics, cloud coverage, and scale height, making it challenging to interpret high-resolution transmission spectra. In this work, we model the cross-correlation signal of five chemical species on WASP-76b and find that the phase-dependent Doppler shift of absorption lines is influenced by planetary rotation and the unique 3D spatial distribution of chemical species. The observation of multiple species' absorption signals is crucial for understanding the 3D thermochemical structure and dynamics of ultra-hot Jupiters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Lietzow, S. Wolf, R. Brunngraeber
Summary: Polarimetry is becoming a powerful tool for studying the atmospheric properties of exoplanets. The goal is to develop a radiative transfer tool that can comprehensively analyze the polarized flux caused by scattering, avoiding common simplifications.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Lietzow, S. Wolf
Summary: Investigated the impact of selected cloud condensates in exoplanetary atmospheres on the polarization of scattered stellar radiation. Found that the complex refractive index of cloud condensates has unique wavelength-dependent characteristics, which can be used to characterize cloud compositions in planetary atmospheres.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Joost P. Wardenier, Vivien Parmentier, Elspeth K. H. Lee
Summary: Transmission spectra of transiting exoplanets provide valuable information about their atmospheres. In this study, a new formula is derived to estimate the opening angle of a planet, which determines the atmospheric region impacting the transmission spectrum. Results show that the opening angle varies among different types of planets, with ultra-hot Jupiters having a smaller opening angle compared to other planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Zewen Jiang, Wei Wang, Guo Chen, Fei Yan, Heather M. Cegla, Patricio Rojo, Yaqing Shi, Qinglin Ouyang, Meng Zhai, Yujuan Liu, Fei Zhao, Yuqin Chen
Summary: Transit spectroscopy is a commonly used technique to study the atmosphere of exoplanets. In this study, the transmission spectra of WASP-85Ab were obtained and Ha, Ca II, and Li I absorptions were tentatively detected.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Arazi Pinhas, Nikku Madhusudhan, Cathie Clarke
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2016)
Article
Astronomy & Astrophysics
Arazi Pinhas, Benjamin V. Rackham, Nikku Madhusudhan, Daniel Apai
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
John Southworth, J. Tregloan-Reed, A. Pinhas, N. Madhusudhan, L. Mancini, A. M. S. Smith
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Arazi Pinhas, Nikku Madhusudhan, Siddharth Gandhi, Ryan MacDonald
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Anastasia Fialkov, Rennan Barkana, Arazi Pinhas, Eli Visbal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2014)