Using the Cosmology Large Angular Scale Surveyor, we measure the disk-averaged absolute Venus brightness temperature to be 432.3 ± 2.8 K and 355.6 ± 1.3 K in the Q and W frequency bands centered at 38.8 and 93.7 GHz, respectively. At both frequency bands, these are the most precise measurements to date. Furthermore, we observe no phase dependence of the measured temperature in either band. Our measurements are consistent with a CO2-dominant atmospheric model that includes trace amounts of additional absorbers like SO2 and H2SO4.
@article{arxiv.2010.12739,
title = {Venus Observations at 40 and 90 GHz with CLASS},
author = {Sumit Dahal and Michael K. Brewer and John W. Appel and Aamir Ali and Charles L. Bennett and Ricardo Bustos and Manwei Chan and David T. Chuss and Joseph Cleary and Jullianna D. Couto and Rahul Datta and Kevin L. Denis and Joseph Eimer and Francisco Espinoza and Thomas Essinger-Hileman and Dominik Gothe and Kathleen Harrington and Jeffrey Iuliano and John Karakla and Tobias A. Marriage and Sasha Novack and Carolina Núñez and Ivan L. Padilla and Lucas Parker and Matthew A. Petroff and Rodrigo Reeves and Gary Rhoades and Karwan Rostem and Deniz A. N. Valle and Duncan J. Watts and Janet L. Weiland and Edward J. Wollack and Zhilei Xu},
journal= {arXiv preprint arXiv:2010.12739},
year = {2021}
}