Lewis, B. L., Li, Y., Gibbs, A., Fitzgerald, M. P., Brandt, T., Gagliuffi, D. B., ... & Mazin, B. (2024). SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B. arXiv preprint arXiv:2411.06003.
This study aims to accurately characterize the temperature, luminosity, and spectral type of the recently discovered brown dwarf companion HIP 93398 B, and to determine if its properties align with existing brown dwarf cooling models.
The researchers obtained high-contrast imaging and spectroscopic observations of HIP 93398 B using the SCExAO/CHARIS instrument at Subaru Observatory. They analyzed the data to refine the companion's orbital parameters, derive its photometry and colors, and compare its spectra to both empirical spectral standards and theoretical substellar atmosphere models from the Sonora Diamondback grid.
The study concludes that HIP 93398 B is not an overmassive T dwarf as initially suggested, but rather a cloudy late-L dwarf consistent with evolutionary models. This highlights the importance of considering cloud effects in substellar atmosphere models, especially for objects near the L/T transition.
This research contributes to the growing body of knowledge about brown dwarf atmospheres and their evolution. The accurate characterization of HIP 93398 B provides a valuable benchmark for refining substellar atmosphere models, particularly those incorporating cloud physics.
While the study resolves the tension with evolutionary models, the authors acknowledge the need for more precise age determination of the HIP 93398 system. Further observations, particularly in the L' band, could help constrain the cloud properties of HIP 93398 B and improve the accuracy of its atmospheric characterization.
To Another Language
from source content
arxiv.org
Key Insights Distilled From
by Briley Lewis... at arxiv.org 11-12-2024
https://arxiv.org/pdf/2411.06003.pdfDeeper Inquiries