![Multiwavelength images of the two > 4𝜎 SJH candidates. Top: KIC 6606183. Bottom: KIC 9834255. Columns: WISE W1–W4 and Aladin DSS colour composite. Nearby sources are visible but their physical association requires high-resolution imaging. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Stellar-J.png?resize=1200%2C720&ssl=1)
[astro-ph.SR] We introduce Stellar J-Harvesting (SJH), a technosignature in which an engineered system extracts rotational angular momentum from a star.
astro-ph.SR
![The Rapid ASKAP Continuum Survey (RACS) radio images of radio sources associated with candidates A (J1245-2652, top row) and B (J0356-4031, bottom row) are shown at three frequencies: 887.5 MHz (left), 1367.5 MHz (centre), and 1655.5 MHz (right), with each panel covering a field of view of 65" × 65" . White ellipses show the PyBDSF source fits from the RACS catalogues, with thick solid lines indicating the fits at the frequency of the image, while thin dashed lines show fits from the other radio frequencies for comparison. Large blue crosses (×) mark radio source positions for the corresponding frequency, and small blue plus signs (+) indicate positions at other frequencies. The red stars represent the Gaia positions propagated to the corresponding RACS observation epochs using the measured proper motions. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Archival-Diagnostics.png?resize=1200%2C720&ssl=1)
Posted inSETI & Technosignatures
Archival Diagnostics for Potential Background Contaminants Of Project Hephaistos Dyson Sphere Candidates
[astro-ph.SR] We report on the diagnostic inspection of nine Project Hephaistos Dyson Sphere candidate M-dwarfs based on archival data. By comparing the Gaia positions, propagated to the AllWISE epoch, with […]
![The figure illustrates the four main phases of low-mass star formation: from the gravitational collapse of the natal core of gas and dust (Prestellar Core), to the main accretion phase (Class 0/I protostar, age ∼104 -105 yr), followed by the protostar and its surrounding protoplanetary disk (Class I/II, age ∼105 -106 yr), and finally the revealed planetary system after the disk has dispersed (Class III, age ∼107 yr). Typical spatial and timescales are indicated for each stage. Generated with Google Gemini 3 Flash and modified. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Cradle-of-Life.png?resize=1200%2C714&ssl=1)
Posted inHabitable Zones
Cradle Of Life: From The Formation Of Stars To Habitable Worlds With The SKAO
[astro-ph.SR] This chapter provides an overview of the different science cases covered by the “Cradle of Life” working group, which aims to leverage the capabilities of the Square Kilometre Array […]
Posted inAstrochemistry
Astrochemical Study of Early Embedded Discs
[astro-ph.SR] The question of how our planet was formed and, more generally, how a planetary system forms is fundamental and has been addressed in a broad range of research domains. […]
Posted inHabitable Zones
Nautilus: Fast Time-Resolved Spectroscopy of GKM Stellar Flares and Their Implications for Planetary Habitability
[astro-ph.SR] Low-mass GKM dwarfs are prime targets for finding habitable-zone Earth-sized planets, but their frequent flares, especially on M~dwarfs, can strongly affect planetary atmospheres through enhanced UV/XUV radiation and stellar […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Space Weather & Heliophysics, Status Report, Stellar Cartography
Summary Of The First Year Of The Space Weather Around Young Suns Program: 900 Hours Of Low-frequency Radio And Optical Data Dedicated To Young, Solar-type Stars
The Space Weather Around Young Suns (SWAYS) program was introduced in Davis2025 as a multi-wavelength monitoring program for studying the activity and particle environments of nearby, young, solar-type stars.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Analysis Of The Young Disk Around WRAY 15-1880: Does It Contain A Primitive Planetary System?
Observations of (giant) planets accreting material within their natal environment are crucial to constrain models for their formation.
Posted inAstrochemistry, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report
First Detection of HC5N in a Class II Disk around TW Hya
Over the last decade of ALMA’s operation the molecular inventory of protoplanetary disks has expanded rapidly, revealing a diverse set of nitrogen-bearing organics and carbon-chain molecules that trace both prebiotic […]
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Interstellar, Status Report
Ca-bearing Cyanopolyynes in IRC+10216
In recent years, a number of metal-containing, carbon-chain species have been detected in the external circumstellar envelope of the carbon-rich AGB star IRC+10216.
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Status Report, Stellar Cartography
Stellar Population Astrophysics (SPA) With The TNG. CNO Abundances In 28 Open Clusters
Aims. Our main aim with this work was to enlarge the pool of open clusters with determined carbon, nitrogen, and oxygen abundances in evolved giants to further advance chemical clocks […]