PARSEC Archives

Plot of the various HZ limits (solid red and blue lines) and the evolution of instellation and effective temperature at the orbiting distance of each of the outer planets from the current age of the Sun until the RGB tip (see Figure 2). The HZ limit colors and line styles are the same as in Figure 1. During the RGB the instellation increases and the effective temperature decreases with respect to time. Therefore, the tracks evolve such that they enter from the right side and exit at the left side of the figure. Pluto’s track ends inside the axis limits, meaning that Pluto barely exceeds the recent Venus IHZ limit during the RGB. -- NASA NTRS

Astronomy & Telescopes, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Status Report

Multiple Habitable Phases On Outer Exosolar Worlds

by Keith CowingMay 29, 2025May 26, 2025

As stars evolve to higher luminosities during first ascension of the giant branch, previously frozen terrestrial worlds may thaw and host liquid water on their surfaces.

Spectral energy distribution and spectrum of 51 Eridani. The black line is the NGSL and SpeX spectrum, with grey regions indicating a model. Photometry is shown in red, with horizontal error bars indicating the width of the filter, while vertical show the photometric uncertainty. Synthetic photometry from the spectrum is shown in green. The bottom panel shows the difference between the spectrum and photometry in units of standard deviations. -- astro-ph.EP

Astrogeology, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Measuring The Stellar And Planetary Properties Of The 51 Eridani System

by Keith CowingJanuary 4, 2024January 4, 2024

In order to study exoplanets, a comprehensive characterization of the fundamental properties of the host stars, such as angular diameter, temperature, luminosity, and age, is essential, as the formation and […]

PARSEC

Multiple Habitable Phases On Outer Exosolar Worlds

Measuring The Stellar And Planetary Properties Of The 51 Eridani System

Astrobiologist Dale Andersen’s Antarctic Field Report: Preview: Fall 2026 Lake Untersee Field Season

Excess Oxygen Stored In Deep Earth Magma May Help Explain How Earth’s Atmosphere Became Oxygen-rich

Using Nuclear Technology To Change How We Explore Icy Ocean Worlds: Examples From Nuclear Powered Mission Concept Designs

Radiation Limits On Amino Acid Preservation And Chiral Measurement At Oxia Planum

Tree of Life Program Targets Publication Of 200 Genome Notes Per Month