Addressing Exoplanetary Degeneracies Through Geometry: Application to Asynchronously Rotating Systems
Abstract
This study augments the geometry-based InstellCa code that calculates accurate irradiance values to InstellCa--2, which computes the longitude averaged instellation over a given latitude on the planet along with its effective temperature profile. The estimation of instellation is performed considering the planet as a 3D body that asynchronously rotates, causing a varying zenith angle of the star resulting in a diurnal cycle. This serves as a specialised case study to demonstrate how the combination of this relative rotation and extreme proximity to host-stars can affect the estimated effective temperatures of close-in planets. 55 Cancri e is selected specifically to demonstrate the importance of this effect as it has been earlier hypothesised to exhibit asynchronous rotation and also has a debated scientific discourse about the existence of an atmosphere on the planet. The TRAPPIST-1 system, being a multi-planetary system susceptible to mean motion resonances, also serves as an interesting exemplar case to demonstrate these effects. Incorporating the stellar zenith angle to the geometrical analysis allows the possibility of physically feasible Bond albedo values that would otherwise be prohibited if a synchronously rotating bare rock scenario is assumed. Consequently, the degeneracies in the modelling of different atmospheric states of such planets can be reduced if the correct geometry is taken into account.
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BibTeX
@misc{sadh2026addressing,
title = {{Addressing Exoplanetary Degeneracies Through Geometry: Application to Asynchronously Rotating Systems}},
author = {Mradumay Sadh},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.09241},
eprint = {2608.09241},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.09241},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Addressing Exoplanetary Degeneracies Through Geometry: Application to Asynchronously Rotating Systems
AU - Mradumay Sadh
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2608.09241
UR - https://arxiv.org/abs/2608.09241
AB - This study augments the geometry-based InstellCa code that calculates accurate irradiance values to InstellCa--2, which computes the longitude averaged instellation over a given latitude on the planet along with its effective temperature profile. The estimation of instellation is performed considering the planet as a 3D body that asynchronously rotates, causing a varying zenith angle of the star resulting in a diurnal cycle. This serves as a specialised case study to demonstrate how the combination of this relative rotation and extreme proximity to host-stars can affect the estimated effective temperatures of close-in planets. 55 Cancri e is selected specifically to demonstrate the importance of this effect as it has been earlier hypothesised to exhibit asynchronous rotation and also has a debated scientific discourse about the existence of an atmosphere on the planet. The TRAPPIST-1 system, being a multi-planetary system susceptible to mean motion resonances, also serves as an interesting exemplar case to demonstrate these effects. Incorporating the stellar zenith angle to the geometrical analysis allows the possibility of physically feasible Bond albedo values that would otherwise be prohibited if a synchronously rotating bare rock scenario is assumed. Consequently, the degeneracies in the modelling of different atmospheric states of such planets can be reduced if the correct geometry is taken into account.
ER -