December 13, 2019 updates Posted on December 13, 2019June 28, 2020 by Doug Loss Approach to exploring interstellar objects and long-period comets https://authors.library.caltech.edu/100202/ The K2-18b Planetary System: Estimates of the Age and X-UV Irradiances of a Habitable Zone “Wet” Sub-Neptune Planet https://iopscience.iop.org/article/10.3847/2515-5172/ab6086 SWIMMERs: A Thought Experiment on the Potential and Limitations of Propellantless Interstellar Travel https://www.centauri-dreams.org/2019/12/12/swimmers-a-thought-experiment-on-the-potential-and-limitations-of-propellantless-interstellar-travel/ The young planetary system K2-25: constraints on companions and starspots https://arxiv.org/abs/1912.05552 GJ 1252 b: A 1.2 R⊕ planet transiting an M-dwarf at 20.4 pc https://arxiv.org/abs/1912.05556 Do the TRAPPIST-1 Planets Have Hydrogen-rich Atmospheres? https://arxiv.org/abs/1912.05749 Hot Super-Earths with Hydrogen Atmospheres: A Model Explaining Their Paradoxical Existence https://arxiv.org/abs/1912.05884 HST/STIS capability for Love number measurement of WASP-121b https://arxiv.org/abs/1912.05889