TOI 4633 Archives - Astrobiology

Schematic overview of the eccentric binary system TOI 4633 hosting an s-type planet in the habitable zone. The planet was discovered via the transit detection method which leaves the spatial orientation of its orbit unknown. It may either be (a) prograde, i.e., the planet and the companion star share the same sense of rotation, (b) highly inclined, or (c) retrograde as illustrated in the three panels. We find the planet likely to orbit retrograde in order to survive the periodic gravitational perturbations throughout the system’s lifetime of tage = 1.3 ± 0.3 Gyr. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Status Report, Stellar Cartography

Planet Formation And Long-term Stability In A Very Eccentric Stellar Binary

by Keith CowingJanuary 22, 2025January 22, 2025

Planets orbiting one of the two stars in a binary are vulnerable to gravitational perturbations from the other star.

RV time-series (top) and phase-folded plots for TOI 4633 b (lower left) and TOI 4633 c (lower right). SOPHIE (blue circles) and HIRES (orange diamonds) RV measurements are shown following the subtraction of the systemic velocities for each instrument. The light colored error bars show the uncertainties accounting for the jitter. Solid black lines show the inferred median model. Grey lines show models made with 100 random samples from the posterior distributions. -- astro-ph.EP

Astronomy & Telescopes, Citizen Science / Open Science, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report

Planet Hunters TESS V: A Planetary System Around A Binary Star, Including A mini-Neptune In The Habitable Zone

by Keith CowingMay 2, 2024May 2, 2024

We report on the discovery and validation of a transiting long-period mini-Neptune orbiting a bright (V = 9.0 mag) G dwarf (TOI 4633; R = 1.05 RSun, M = 1.10 […]

An artist’s interpretation of TOI 4633 c, a Neptune-like exoplanet found orbiting the habitable zone of a sunlike star. The system contains a second star (right) and may also host another exoplanet (left). CREDIT Ed Bell for the Simons Foundation

Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Citizen Science / Open Science, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release

Citizen Scientists Help Discover A Habitable Zone Exoplanet In A Binary Star System

by Keith CowingMay 1, 2024May 1, 2024

A team of astronomers and citizen scientists has discovered a planet in the habitable zone of an unusual star system, including two stars and potentially another exoplanet.