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.

September 18, 2025 updates

How Interstellar Objects Similar to 3I/ATLAS Could Jump-Start Planet Formation Around Infant Stars
https://www.europlanet.org/epsc-dps2025-how-interstellar-objects-similar-to-3i-atlas-could-jump-start-planet-formation-around-infant-stars/

X-SHYNE: X-Shooter spectra of young exoplanet analogs – II. Presentation and analysis of the full library
https://www.aanda.org/articles/aa/full_html/2025/09/aa54986-25/aa54986-25.html

Discovery of an icy and nitrogen-rich extrasolar planetesimal
https://academic.oup.com/mnras/article/543/1/223/8255944

Do Outer Giants Inflate Neptune-sized Planets? An Architecture-Dependent Mass–Radius Relation
https://academic.oup.com/mnrasl/advance-article/doi/10.1093/mnrasl/slaf098/8256834

Temporal evolution of the third interstellar comet 3I/ATLAS: Spin, color, spectra, and dust activity
https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/202556717

Planet Earth in reflected and polarized light – III. Modeling and analysis of a decade-long catalog of Earthshine observations
https://arxiv.org/abs/2509.13415

Astrometric Methods for Detecting Exomoons Orbiting Imaged Exoplanets: Prospects for Detecting Moons Orbiting a Giant Planet in α Centauri A’s Habitable Zone
https://arxiv.org/abs/2509.13513

ARDENT: A Python package for fast dynamical detection limits with radial velocities
https://arxiv.org/abs/2509.13521

Volatile-bearing mineral atmospheres of hot rocky exoplanets as probes of interior state and composition
https://arxiv.org/abs/2509.13610

Investigating aerosols as a reconciliation mechanism for K2-18 b JWST MIRI and NIRISS/NIRSpec observations
https://arxiv.org/abs/2509.13932

Diversity in planetary architectures from pebble accretion: Water delivery to the habitable zone with pebble snow
https://arxiv.org/abs/2509.14101

Transit Timing Variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system
https://arxiv.org/abs/2509.14156

Possible Evidence for the Presence of Volatiles on the Warm Super-Earth TOI-270 b
https://arxiv.org/abs/2509.14224

September 17, 2025 updates

Interstellar objects: from theory to observations
https://meetingorganizer.copernicus.org/EPSC-DPS2025/session/55013

Life Detection Knowledge Base
https://lifedetectionforum.com/ldkb

The SPACE Program – I. The featureless spectrum of HD 86226 c challenges sub-Neptune atmosphere trends
https://www.aanda.org/articles/aa/full_html/2025/09/aa54916-25/aa54916-25.html

ATREIDES – I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
https://www.aanda.org/articles/aa/full_html/2025/09/aa54856-25/aa54856-25.html

X-SHYNE: X-Shooter spectra of young exoplanet analogs – II. Presentation and analysis of the full library
https://www.aanda.org/articles/aa/full_html/2025/09/aa54986-25/aa54986-25.html

BOWIE-ALIGN: Weak spectral features in KELT-7b’s JWST NIRSpec/G395H transmission spectrum imply a high cloud deck or a low-metallicity atmosphere
https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staf1535/8255897

Searching for Planets Orbiting epsilon Eridani with JWST/NIRCam
https://iopscience.iop.org/article/10.3847/1538-3881/adf727

Possible Evidence for the Presence of Volatiles on the Warm Super-Earth TOI-270 b
https://iopscience.iop.org/article/10.3847/1538-3881/adfc6a

Born Dry or Born Wet? A Palette of Water Growth Histories in TRAPPIST-1 Analogs and Compact Planetary Systems
https://iopscience.iop.org/article/10.3847/2041-8213/adf282

The “Analogs for VENus’ GEologically Recent Surfaces” (AVENGERS) Initiative: Using Terrestrial Analogs to Study Recent Volcano-Tectonic Activity on Venus and Inform the Characterization of Terrestrial Exoplanets
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JE008675

Do Outer Giants Inflate Neptune-sized Planets? An Architecture-Dependent Mass-Radius Relation
https://arxiv.org/abs/2509.12328

No Giant Planets in the Eta Cassiopeiae System: Dynamical Implications of a Wide Binary Companion
https://arxiv.org/abs/2509.12334

Multiple Giant Impacts and Chemical Equilibria: An Integrated Approach to Rocky Planet Formation
https://arxiv.org/abs/2509.12713

TSD: An inverse problem approach for recovering the exoplanetary atmosphere transmission spectrum from high-resolution spectroscopy
https://arxiv.org/abs/2509.12737

Massive Retrograde Moons May Survive During Different Hot Jupiters’ Migration Scenario
https://arxiv.org/abs/2509.13263

Redefining interiors and envelopes: hydrogen-silicate miscibility and its consequences for the structure and evolution of sub-Neptunes
https://arxiv.org/abs/2509.13320

September 16, 2025 updates

Characteristics of Exoplanets in Transiting Systems HD 189733 and HD 209458: Considering the Four-Parameter Law of Star Darkening within the Framework of a Three-Dimensional Model of Its Atmosphere
https://link.springer.com/article/10.1134/S1063772925701963

Characteristics of Super-Earths and Mini-Neptunes
https://link.springer.com/article/10.1134/S1063772925701926

ATREIDES — I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
https://www.aanda.org/articles/aa/full_html/2025/09/aa54856-25/aa54856-25.html

How an Interstellar Interloper Spurred Astronomers into Action
https://eos.org/features/how-an-interstellar-interloper-spurred-astronomers-into-action

The Photochemical Plausibility of Warm Exo-Titans Orbiting M-Dwarf Stars
https://arxiv.org/abs/2509.10611

LEO-Vetter: Fully Automated Flux- and Pixel-Level Vetting of TESS Planet Candidates to Support Occurrence Rates
https://arxiv.org/abs/2509.10619

Hydrocarbon Hazes on Temperate sub-Neptune K2-18b supported by data from the James Webb Space Telescope
https://arxiv.org/abs/2509.10947

The Polar Orbit of TOI-2374 b, a Planet in the Neptunian Ridge
https://arxiv.org/abs/2509.11565

Evidence for a gap in the envelope mass fraction of sub-Saturns
https://arxiv.org/abs/2509.12120

September 15, 2025 Updates

Nuclear Fusion Propulsion Systems For Deep Space Travel Architecture: A Review
https://www.tandfonline.com/doi/full/10.1080/15361055.2025.2533077

Life in Space: Astrobiology for Nonscientists
https://link.springer.com/book/10.1007/978-3-031-64639-3

Constraints on the possible atmospheres on TRAPPIST-1 b: insights from 3D climate modeling
https://www.aanda.org/articles/aa/full_html/2025/09/aa54243-25/aa54243-25.html

The SPACE Program I. The featureless spectrum of HD 86226 c challenges sub-Neptune atmosphere trends
https://www.aanda.org/articles/aa/full_html/2025/09/aa54916-25/aa54916-25.html

Speeding up slows down: A potential paradox of innovation curtailment in nomadic societies engaged in interstellar relativistic traffic
https://www.sciencedirect.com/science/article/abs/pii/S0094576525005958

Asymptotic relative dynamics for spacecraft on close hyperbolic trajectories
https://www.sciencedirect.com/science/article/abs/pii/S0094576525005612

Collision induced absorption in HITRAN2024: Enhanced and improved data for atmospheric and planetary studies
https://www.sciencedirect.com/science/article/abs/pii/S0022407325002936

The Watery Atmosphere of HD 209458 b Revealed by Joint K- and L-band High-resolution Spectroscopy
https://iopscience.iop.org/article/10.3847/1538-3881/adfb71

Precise Constraints on the Energy Budget of WASP-121 b from its JWST NIRISS/SOSS Phase Curve
https://arxiv.org/abs/2509.09760

The New Generation Planetary Population Synthesis (NGPPS). VII. Statistical comparison with the HARPS/Coralie survey
https://arxiv.org/abs/2509.09762

Initial conditions for tidal synchronisation of a planet by its moon
https://arxiv.org/abs/2509.09858

A four-planet system orbiting the old thick disk star TOI-1203
https://arxiv.org/abs/2509.10136

September 12, 2025 updates

How common are biological ETIs in the Galaxy?
https://meetingorganizer.copernicus.org/EPSC-DPS2025/EPSC-DPS2025-1512.html

3I/ATLAS: In Search of the Witnesses to Its Voyage
https://arxiv.org/abs/2509.07678

Precovery Observations of 3I/ATLAS from TESS Suggest Possible Distant Activity
https://iopscience.iop.org/article/10.3847/2041-8213/adfd4d

Fine-tuning the complex organic molecule formation: Sulfur and CO ice as regulators of surface chemistry
https://www.aanda.org/articles/aa/full_html/2025/09/aa54678-25/aa54678-25.html

Sulfur oxides tracing streamers and shocks at low-mass protostellar disk–envelope interfaces
https://www.aanda.org/articles/aa/full_html/2025/09/aa54186-25/aa54186-25.html

How the chemical composition of solids influences the formation of planetesimals
https://www.aanda.org/articles/aa/full_html/2025/09/aa55591-25/aa55591-25.html

The New Generation Planetary Population Synthesis (NGPPS) VII. Statistical comparison with the HARPS/Coralie survey
https://www.aanda.org/articles/aa/full_html/2025/09/aa52485-24/aa52485-24.html

The New Generation Planetary Population Synthesis (NGPPS) VIII. Impact of host star metallicity on planet occurrence rates, orbital periods, eccentricities, and radius valley morphology
https://www.aanda.org/articles/aa/full_html/2025/09/aa55380-25/aa55380-25.html

Planets Around Solar Twins/Analogs (PASTA) II. Chemical abundances, systematic offsets, and clues as to planet formation
https://www.aanda.org/articles/aa/full_html/2025/09/aa56272-25/aa56272-25.html

JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b
https://iopscience.iop.org/article/10.3847/1538-3881/adee92

First Results from WINERED: Detection of Emission Lines from Neutral Iron and a Combined Set of Trace Species on the Dayside of WASP-189 b
https://iopscience.iop.org/article/10.3847/1538-3881/adfb61

Aetheras: Characterizing exoplanetary atmospheric escape with NIR and UV spectroscopy
https://www.sciencedirect.com/science/article/pii/S0094576525005491

Collision induced absorption in HITRAN2024: Enhanced and improved data for atmospheric and planetary studies
https://www.sciencedirect.com/science/article/abs/pii/S0022407325002936

Dynamical and Electromagnetic Analysis of 3I/ATLAS
https://www.researchgate.net/publication/395404990_Dynamical_and_Electromagnetic_Analysis_of_3IATLAS

Chemical and Formation Analysis of Interstellar Comet 3I/ATLAS: Evidence for AGB Star Origin
https://www.researchgate.net/publication/395405143_Chemical_and_Formation_Analysis_of_Interstellar_Comet_3IATLAS_Evidence_for_AGB_Star_Origin

Validating the Tanfarid Quantum Thermodynamic Universe (TQTU) with Ground-Based Mega Observatories: ELT, TMT, and GMT -An Updated Data-Driven Analysis and Simulation
https://www.researchgate.net/publication/395385496_Validating_the_Tanfarid_Quantum_Thermodynamic_Universe_TQTU_with_Ground-Based_Mega_Observatories_ELT_TMT_and_GMT_-An_Updated_Data-Driven_Analysis_and_Simulation

Lyman-Alpha Emission from K and M Dwarfs: Intrinsic Profiles, Variability, and Flux in the Habitable Zone
https://arxiv.org/abs/2509.09029

Dust growth and planet formation by disc fragmentation
https://arxiv.org/abs/2509.09305

Dual-Backend Multibeam Position Switching Targeted SETI Observations toward Nearby Active Planet-Hosting Systems with FAST
https://arxiv.org/abs/2509.09654

Detecting Land with Reflected Light Spectroscopy to Rule Out Waterworld O2 Biosignature False Positives
https://arxiv.org/abs/2506.21790