Interstellar Updates

 

These are items of interest to the interstellar exploration community that we’ve found in our quest for information that will help us advance toward our goals.  If you know of anything we’ve overlooked, or any sources of such information we should monitor, or if you would like to be added to our IRG-updates mailing list and receive these updates in you email every weekday, please send that information to info@irg.space.

You can now search our database of interstellar updates and find items of interest to you.

October 01, 2025 updates

Natural Philosophy of Protoplanetary and Planetary Discs: On the Origin and Evolution of Life
https://www.onlinescientificresearch.com/journals/jeesr/abstract/natural-philosophy-of-protoplanetary-and-planetary-discs-on-the–origin-and-evolution-of-life-6825.html

Artificial Broadcasts as Galactic Populations: III. Constraints on Radio Broadcasts from the Cosmic Population of Inhabited Galaxies
https://arxiv.org/abs/2508.00249

The CARMENES search for exoplanets around M dwarfs – Occurrence rates of Earth-like planets around very low-mass stars
https://www.aanda.org/articles/aa/full_html/2025/04/aa53381-24/aa53381-24.html

Testing the performance of cross-correlation techniques to search for molecular features in JWST NIRSpec G395H observations of transiting exoplanets
https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staf1659/8268886

A Scaling Law for the Orbital Architecture of Planetary Systems Formed by Gravitational Scattering and Collisions
https://iopscience.iop.org/article/10.3847/2041-8213/ae06fc

Water solubility in silicate melts: The effects of melt composition under reducing conditions and implications for nebular ingassing on rocky planets
https://www.sciencedirect.com/science/article/abs/pii/S0009254125004383

Combined Exoplanet Mass and Atmospheric Characterization for Accelerated Exoplanetology
https://arxiv.org/abs/2509.25323

Dynamical Architectures of S-type Transiting Planets in Binaries II: A Dichotomy in Orbital Alignment of Small Planets in Close Binary Systems
https://arxiv.org/abs/2509.25332

Multi-modal atmospheric characterization of β Pictoris b: Adding high-resolution continuum spectra from GRAVITY
https://arxiv.org/abs/2509.25338

The Open-Source Photochem Code: A General Chemical and Climate Model for Interpreting (Exo)Planet Observations
https://arxiv.org/abs/2509.25578

Revisiting the Atmosphere of HD 149026b: The Role of Stellar Abundances and Choice of Opacities in Exoplanet Atmosphere Modeling
https://arxiv.org/abs/2509.25785

Extreme NiI/FeI abundance ratio in the coma of the interstellar comet 3I/ATLAS
https://arxiv.org/abs/2509.26053

Architecture of planetary systems with and without outer giant planets I. Inner planet detections around HD 23079, HD 196067, and HD 86226
https://arxiv.org/abs/2509.26232

General Relativity Can Prevent a Runaway Greenhouse on Potentially Habitable Planets Orbiting White Dwarfs
https://arxiv.org/abs/2509.26421

Direct Measurement of Extinction in a Planet-Hosting Gap
https://arxiv.org/abs/2509.26617

September 30, 2025 updates

Beyond the Dark Forest: A Critical Analysis and Novel Extension of Liu Cixin’s Interstellar Civilization Theory
https://zenodo.org/records/17227223

A Two-Planet Problem with an Arbitrary Inclination of a Pair of Orbits. Secular Evolution of the Kepler-117 Exosystem
https://link.springer.com/article/10.1134/S1063772925702026

Modeling of Hot Jupiter HAT-P-32b and Transit Absorptions in Excited Hydrogen and Helium Atom Lines
https://link.springer.com/article/10.1134/S106377292570204X

Temporal evolution of the third interstellar comet 3I/ATLAS: Spin, color, spectra, and dust activity
https://www.aanda.org/articles/aa/full_html/2025/10/aa56717-25/aa56717-25.html

Competing chemical signatures in the atmosphere of TOI-270 d: Inference of sulfur and carbon chemistry
https://www.aanda.org/articles/aa/full_html/2025/09/aa55194-25/aa55194-25.html

The Formation of Ultra-short-period Planets under the Influence of the Nearby Planetary Companions
https://iopscience.iop.org/article/10.3847/1538-4357/adfdd1

Water Production Rates of the Interstellar Object 3I/ATLAS
https://iopscience.iop.org/article/10.3847/2041-8213/ae08ab

Revising core powered mass loss: A critical assessment of the “energy limited” argument
https://www.sciencedirect.com/science/article/abs/pii/S0019103525003756

Technique-agnostic exoplanet demography for the Roman era – I. Testing a retrieval framework using simulated Kepler-like transit datasets
https://arxiv.org/abs/2509.24401

Re-accretion of Giant Impact Ejecta Can Drive Significant Atmospheric Erosion on Terrestrial Planets
https://arxiv.org/abs/2509.22785

A Less Terrifying Universe? Mundanity as an Explanation for the Fermi Paradox
https://arxiv.org/abs/2509.22878

Shedding Light on Desert Dwellers
https://arxiv.org/abs/2509.22893

Coupled Planetary Interior and Tidal Evolution
https://arxiv.org/abs/2509.22923

HARPS-N Reveals a Well-aligned Orbit for the Highly Eccentric Warm Jupiter TOI-4127 b
https://arxiv.org/abs/2509.22972

How clear are the skies of WASP-80b?: 3D Cloud feedback on the atmosphere and spectra of the warm Jupiter
https://arxiv.org/abs/2509.23406

Blink and you’ll miss it – How Technological Acceleration Shrinks SETI’s Narrow Detection Window
https://arxiv.org/abs/2509.23632

Detection of OH and Fe in the dayside atmosphere of the hottest ultra-hot Jupiter KELT-9b with SPIRou
https://arxiv.org/abs/2509.23850

The Formation of Ultra-short-period Planets under the Influence of the Nearby Planetary Companions
https://arxiv.org/abs/2509.24199

Induction Heating in Super-Earths: A Thermochemical Perspective
https://arxiv.org/abs/2509.25092

Colors of Life in the Clouds: Biopigments of atmospheric microorganisms as a new signature to detect life on planets like Earth
https://arxiv.org/abs/2509.25173

Testing the Origin of Hot Jupiters with Atmospheric Surveys
https://arxiv.org/abs/2507.13446

September 29, 2025 Updates

From Earthbound to Stars: Analyzing Humanity’s Path to a Type II Civilization
https://www.preprints.org/manuscript/202509.1932/v1

Hybrid Strategy for Coordinated Interstellar Signaling: Linking the Galactic Center and Extragalactic Bursts
https://arxiv.org/abs/2509.20718

The Temporal Observability Filter Hypothesis (TOFH): A Physically-Constrained, Bayesian Framework for the Observational Invisibility of Technological Civilizations
https://www.academia.edu/143709470/The_Temporal_Observability_Filter_Hypothesis_TOFH_A_Physically_Constrained_Bayesian_Framework_for_the_Observational_Invisibility_of_Technological_Civilizations

Innovative SiC ultraviolet instrumentation development with potential applications for the Habitable Worlds Observatory
https://www.spiedigitallibrary.org/journals/Journal-of-Astronomical-Telescopes-Instruments-and-Systems/volume-11/issue-4/042225/Innovative-SiC-ultraviolet-instrumentation-development-with-potential-applications-for-the/10.1117/1.JATIS.11.4.042225.full

Beyond Earth: Strategic Pathways to a Multiplanet Civilization and the Case for Mars Settlement
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=2362&context=ccr

The Transcendent Tapestry
https://philarchive.org/rec/AROTTT

Debris disks and their properties with the Habitable Worlds Observatory
https://arxiv.org/abs/2509.21407

Upper Limit on the Non-Gravitational Acceleration and Lower Limits on the Nucleus Mass and Diameter of 3I/ATLAS
https://arxiv.org/abs/2509.21408

Dynamical Pathways to the Misalignment of the VHS 1256-1257 System
https://arxiv.org/abs/2509.21452

A Combined TESS and Ground-based Study of Transit Timing Variations in HAT-P-16, TOI-1516 and TOI-2046 Systems
https://arxiv.org/abs/2509.21551

Limb Asymmetries on WASP-39b: A Multi-GCM Comparison of Chemistry, Clouds, and Hazes
https://arxiv.org/abs/2509.21588

Low-mass companions to nine stars
https://arxiv.org/abs/2509.22127

Starshades as technosignatures in direct imaging phase curves: Application to the Habitable Worlds Observatory targets
https://arxiv.org/abs/2509.22301

The Origins & Reservoirs of Exocomets
https://arxiv.org/abs/2509.22541

Temporal evolution of the third interstellar comet 3I/ATLAS: Spin, color, spectra, and dust activity
https://www.aanda.org/articles/aa/full_html/2025/10/aa56717-25/aa56717-25.html

Shape shifting sailer: Entry and descent capabilities of self-foldable shape memory membranes
https://www.sciencedirect.com/science/article/abs/pii/S0094576525006320

JWST Detection of a Carbon-dioxide-dominated Gas Coma Surrounding Interstellar Object 3I/ATLAS
https://iopscience.iop.org/article/10.3847/2041-8213/ae0647

Astrometric Methods for Detecting Exomoons Orbiting Imaged Exoplanets: Prospects for Detecting Moons Orbiting a Giant Planet in α Centauri A’s Habitable Zone
https://iopscience.iop.org/article/10.3847/2041-8213/ae0741

PEPSI Investigation, Retrieval, and Atlas of Numerous Giant Atmospheres (PIRANGA). III. Composition and winds in the atmosphere of TOI-1518 b
https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staf1648/8266785

September 26, 2025 updates

Deriving ʻOumuamua’s Anomalous Acceleration from First Principles in Spatial-Causal Geometry (SCG)
https://zenodo.org/records/17205296

The JWST weather report: Retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136
https://www.aanda.org/articles/aa/full_html/2025/10/aa55370-25/aa55370-25.html

Hot Rocks Survey. IV. Emission from LTT 3780 b Is Consistent with a Bare Rock
https://iopscience.iop.org/article/10.3847/1538-3881/adfc51

JWST Detection of a Carbon-dioxide-dominated Gas Coma Surrounding Interstellar Object 3I/ATLAS
https://iopscience.iop.org/article/10.3847/2041-8213/ae0647

Modelling the effect of stellar metallicity on the XUV evolution of low-mass stars and its impact on exoplanet atmospheres/habitability
https://www.researchgate.net/publication/395848251_Modelling_the_effect_of_stellar_metallicity_on_the_XUV_evolution_of_low-mass_stars_and_its_impact_on_exoplanet_atmosphereshabitability

Revising the Giant Planet Mass-Metallicity Relation: Deciphering the Formation Sequence of Giant Planets
https://arxiv.org/abs/2509.20428

Not All Sub-Neptune Exoplanets Have Magma Oceans
https://arxiv.org/abs/2509.20429

How two-dimensional are planet-disc interactions? II. Radiation hydrodynamics and suitable cooling prescriptions
https://arxiv.org/abs/2509.20464

HWO Target Stars and Systems: A Prioritized Community List of Potential Stellar Targets for the Habitable Worlds Observatory’s ExoEarth Survey
https://arxiv.org/abs/2509.20544

September 25, 2025 updates

Planets Without Plate Tectonics and too Little Carbon Dioxide Could Mean that Technological Alien Life is Rare
https://www.europlanet.org/epsc-dps2025-planets-without-plate-tectonics-and-too-little-carbon-dioxide-could-mean-that-technological-alien-life-is-rare/

Winding motion of spirals in a gravitationally unstable protoplanetary disk
https://www.nature.com/articles/s41550-025-02639-y

The GAPS Programme at TNG – LXIX. The dayside of WASP-76 b revealed by GIANO-B, HARPS-N, and ESPRESSO: Evidence of 3D atmospheric effects
https://www.aanda.org/articles/aa/full_html/2025/09/aa55702-25/aa55702-25.html

Impact of rotation on synthetic mass–radius relationships of two-layer rocky planets and water worlds
https://www.aanda.org/articles/aa/full_html/2025/09/aa54116-25/aa54116-25.html

Quantifying thermal water dissociation in the dayside photosphere of WASP-121 b using NIRPS
https://www.aanda.org/articles/aa/full_html/2025/09/aa53724-25/aa53724-25.html

Evolution of Stellar Activity and Habitable zone: I. Ultraviolet Emission of Dwarfs in Open Clusters and Field Stars
https://arxiv.org/abs/2509.18559

Searching for GEMS: TOI-5349b is a Saturn-like planet orbiting a metal-rich early M-dwarf
https://arxiv.org/abs/2509.19492

Deep learning for exoplanet detection and characterization by direct imaging at high contrast
https://arxiv.org/abs/2509.20310

21st-Century Astrobiology Missions Should Seek These High-Confidence Biosignatures
https://arxiv.org/abs/2508.02746