Searching for a standard Drake equation
https://arxiv.org/abs/1912.01783
Planetary Astrobiology
https://uapress.arizona.edu/book/planetary-astrobiology
The Helical Engine
http://people.uncw.edu/ganl/phy335/project/group-A/Calton-Landon.pdf
The Young Suns Exoplanet Survey: Detection of a wide orbit planetary mass companion to a solar-type Sco-Cen member
https://arxiv.org/abs/1912.04284
Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2
https://arxiv.org/abs/1912.04286
Constraining Orbital Periods from Nonconsecutive Observations: Period Estimates for Long-Period Planets in Six Systems Observed by K2 During Multiple Campaigns
https://arxiv.org/abs/1912.04287
Constraints on Aquatic Photosynthesis for Terrestrial Planets Around Other Stars
https://arxiv.org/abs/1912.04301
The Influence of Stellar Contamination on the Interpretation of Near Infrared Transmission Spectra of Sub-Neptune Worlds around M-Dwarfs
https://arxiv.org/abs/1912.04389