HIP 41378 f Archives

Artist’s rendering of the system around the star HIP 41378. The rings around HIP 41378 f have not been confirmed. Crédit : Salomé Grouffal

A System Of At Least Six Exoplanets Revealed In The HIP 41378 System

by Keith CowingJuly 15, 2026July 15, 2026

[Paris Observatory] An international team, including scientists from the Paris Observatory – PSL at the Time-Space Laboratory, has spent ten years studying an exceptional planetary system comprising at least six […]

Light curves of HIP 41378. Upper panel: K2 C5 campaign (long cadence). Bottom panel: K2 C18 campaign (short cadence). The pink curve represents the median of the best-fit model from photometry and RV analysis. The names of the planets are highlighted with their letters. -- astro-ph.EP

A Decade Of Monitoring The HIP 41378’s Planetary System

by Keith CowingJune 25, 2026June 25, 2026

Multi-planetary systems provide key constraints on planet formation and evolution, as their architecture encodes the dynamical history of planets formed within a common protoplanetary disk.

Long- and short-cadence transit light curve data for HIP 41378 f, folded with orbital period Porb = 542.08 days. The reduced long-cadence data is shown in the left panels in scattered points; the short-cadence data is shown on the right with small points, then binned to 30 minutes and plotted with large points. The solid purple curve shows a randomly-drawn model from the posterior for comparison. The lower row presents the residual between the maximum likelihood model and the data. If we select the maximum likelihood model with f > 0.1, we obtain the residual shown in the dashed purple curve, which is disfavored with log-likelihood difference ∆ (log L) ≈ −3.4 -- astro-ph.EP

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

A Long Spin Period For A Sub-Neptune-mass Exoplanet

by Keith CowingFebruary 23, 2025February 23, 2025

HIP 41378 f is a sub-Neptune exoplanet with an anomalously low density. Its long orbital period and deep transit make it an ideal candidate for detecting oblateness photometrically.

Example two-dimensional projections of the initial positions and orbits of each object in our four-body simulations (including planet e). Panel (a) shows the top-down and edge-on projections of 20 random realizations of the system, with the initial orbits (lines) and positions (points) of planet e shown in orange, and the initial orbits and positions of planet f shown in blue. The black “?” shows the position of the host star, and the dashed black line shows the fixed orbital semi-major axis for planet d. The red boxes indicate the limits of the area plotted in panel (b), which shows a zoomed-in version of the system highlighting the initial position and orbit of the satellite, “s,” (red) orbiting planet f. The 20 system realizations shown here represent the initial conditions at a single grid cell in Figure 3, used to determine the fractional stability for a given Pe and ee. -- astro-ph.EP

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

Stability and Detectability of Exomoons Orbiting HIP 41378 f, a Temperate Jovian Planet with an Anomalously Low Apparent Density

by Keith CowingMarch 27, 2023March 27, 2023

Moons orbiting exoplanets (“exomoons”) may hold clues about planet formation, migration, and habitability. We investigate the plausibility of exomoons orbiting the temperate (Teq=294 K) giant (R=9.2 R⊕) planet HIP 41378 […]

HIP 41378 f

A System Of At Least Six Exoplanets Revealed In The HIP 41378 System

A Decade Of Monitoring The HIP 41378’s Planetary System

A Long Spin Period For A Sub-Neptune-mass Exoplanet

Stability and Detectability of Exomoons Orbiting HIP 41378 f, a Temperate Jovian Planet with an Anomalously Low Apparent Density

Training For Astrobiology Spelunking On Mars

Mars Perseverance Rover’s Panoramic View of Broom Point

Planets Orbiting Barnard’s Star Seem To Be Small, Strange, And Utterly Uninhabitable

Experimental Astrochemistry And Machine Learning Unravel The Formation Of Oxygen-bearing Organic Molecules In Extraterrestrial Ices

Bacteria Form Herds To Survive Predators, Offering Fresh Insight Into Earth’s Carbon Cycle