The observation of a 266.94 GHz feature in the Venus spectrum has been attributed to PH3 in the Venus clouds, suggesting unexpected geological, chemical or even biological processes. Since both […]
Venus
Posted inVenus
Three Different Ways to Explain the Sulfur Depletion in the Clouds of Venus
The depletion of SO2 and H2O in and above the clouds of Venus (45 — 65 km) cannot be explained by known gas-phase chemistry and the observed composition of the […]
Posted inVenus
On the Robustness of Phosphine Signatures in Venus' Clouds
We published spectra of phosphine molecules in Venus’ clouds, following open-science principles in releasing data and scripts (with community input leading to ALMA re-processing, now benefiting multiple projects). Some misconceptions […]
Posted inVenus
Brightness Modulations Of Our Nearest Terrestrial Planet Venus Reveal Atmospheric Super-rotation Rather Than Surface Features
Terrestrial exoplanets orbiting within or near their host stars’ habitable zone are potentially apt for life. It has been proposed that time-series measurements of reflected starlight from such planets will […]
Posted inVenus
Re-analysis Of Phosphine In Venus' Clouds
We first respond to two points raised by Villanueva et al. We show the JCMT discovery spectrum of PH3 can not be re-attributed to SO2, as the line width is […]
Posted inVenus
Surprisingly Little Water Has Escaped from Venus
On 13 November Moa Persson, Swedish Institute of Space Physics (IRF) and Umeå University, will defend her doctoral thesis. Her thesis shows that only a small part of the historical […]
Posted inVenus
No Phosphine In The Atmosphere Of Venus
The detection of phosphine (PH3) has been recently reported in the atmosphere of Venus employing mm-wave radio observations (Greaves et at. 2020). We here demonstrate that the observed PH3 feature […]
Posted inExoplanets, -moons, -comets
Which Stars Can See Earth As A Transiting Exoplanet?
Transit observations have found the majority of exoplanets to date. Spectroscopic observations of transits and eclipses are the most commonly used tool to characterize exoplanet atmospheres and will be used […]
Posted inVenus
Re-analysis Of The 267-GHz ALMA Observations of Venus: No Statistically Significant Detection Of Phosphine
Context: ALMA observations of Venus at 267 GHz have been presented in the literature that show the apparent presence of phosphine (PH3) in its atmosphere. Phosphine has currently no evident […]
Posted inVenus
A Stringent Upper Limit Of The PH3 (Phosphine) Abundance At The Cloud Top Of Venus
Following the announcement of the detection of phosphine (PH3) in the cloud deck of Venus at millimeter wavelengths, we have searched for other possible signatures of this molecule in the […]