e xoplanet Archives

Filamentary structures and anisotropy are observed across the dynamic range of star formation. Starting at the star-forming scale, (1) shows the OMC-1 star-forming filament observed by ALMA+IRAM 30 m in the form of ‘fibers’ identified as velocity coherent on 30,000 au scales (Hacar et al., 2018). Such filamentary behavior and anisotropy is associated with the presence of (2) dense protostellar cores, as in the heterogeneous column density of L1709, inferred from Herschel observations (Arzoumanian et al., 2019) and fit with ballistic free-fall trajectories as in the case of (3) the 10,500 au ‘streamer’ structure around the protostar Per-Emb 2 seen in HC3N by ALMA (Pineda et al., 2020). The structured infalling envelopes of cores like L1709 can be associated with the presence of substructure in the (4) thermal dust continuum (1.3mm) emission from ALMA of its young planet-forming disk (< 500 kyr old) IRS-63 (Segura-Cox et al., 2020) -- astro-ph.EP

Astrochemistry, Astrogeology, Exoplanets, -moons, -comets, Meteorites & Asteroids, Planetary Protection & Biosafety, Status Report

Infall And Disk Processes – The Message From Meteorites

by Keith CowingSeptember 21, 2025September 21, 2025

How do planetary systems, in general, and our own Solar System (SS), in particular, form? In conjunction, Astronomy and Isotope Cosmochemistry provide us with powerful tools to answer this age-old […]

e xoplanet

Infall And Disk Processes – The Message From Meteorites

Roman Space Telescope: Enabling Images Of Distant Worlds

NASA Solar System Exploration Research Virtual Institute (SSERVI) Cooperative Agreement Notice (NNH26ZDA016C) Final Text And Due Dates

Interstellar Aromatic Infrared Bands: IR Absorption Spectroscopy Of The Lowest Triplet State Of Naphthalene

The Highly Unusual Behavior And Chemical Composition Of Interstellar Comet 2I/Borisov

Volatile Depletion In Rocky Planets As A Chemical Fingerprint Of Hybrid Accretion