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Offentlig
Mikko Tuomi

Proxima Centauri is our nearest stellar neighbor and is known to be a very active M dwarf #star.

Known to host a potentially #habitable #planet, the star #Proxima exhibits very active #flare activity in optical wavelengths.

Depending on the energy and frequency of these flares, nearby planets in the habitable zone might be rendered uninhabitable as the flares strip planetary atmospheres of necessary ingredients such as ozone and water.

#astronomy #astrobiology
phys.org/news/2025-03-small-st

Phys.org · Small star, mighty flares: ALMA shares new view of Proxima CentauriAv National Radio Astronomy Observatory
Offentlig
Mikko Tuomi

What happens when a newly formed #star captures material from a nearby cloud?

Gas, dust, and rocky materials swirl around recently formed #stars, creating a circumstellar disk that seeds the formation of #planets.

Recent observations of some of these disks reveal filamentary structures of material falling into the disk, feeding the planet-forming environment with new ingredients in a process known as “late-stage infall.”

#astronomy
aasnova.org/2025/03/21/a-late-

AAS Nova · A Late-Stage Infall Renovation: Mapping the Circumstellar Disk of AB AurigaeWhat happens when a young star captures some extra gas and dust? New observations of a dusty disk reveals how a late-stage infall event may be influencing planet formation in AB Aurigae.
Offentlig
Mikko Tuomi

A #JWST image of Herbig-Haro 49/50 — a frothy-looking outflow from a nearby #protostar — with a multi-hued spiral #galaxy.

Herbig-Haro objects are outflows produced by jets launched from a nearby, forming #star.

The outflows, which can extend for light-years, plow into a denser region of material.

This creates shock waves, heating the material to higher temperatures.

The material then cools by emitting light at visible and infrared wavelengths.

#astronomy
science.nasa.gov/missions/webb

NASA’s James Webb Space Telescope observed Herbig-Haro 49/50, an outflow from a nearby still-forming star, in high-resolution near- and mid-infrared light. The intricate features of the outflow, represented in reddish-orange color, provide detailed clues about how young stars form and how their jet activity affects the environment around them. Like the wake of a speeding boat, the bow shocks in this image have an arc-like appearance as the fast-moving jet from the young star slams into the surrounding dust and gas. A chance alignment in this direction of the sky provides a beautiful juxtaposition of this nearby Herbig-Haro object with a more distant spiral galaxy in the background. Herbig-Haro 49/50 gives researchers insights into the early phases of the formation of low-mass stars similar to our own Sun. In this Webb image, blue represents light at 2.0-microns (F200W), cyan represents light at 3.3-microns (F335M), green is 4.4-microns (F444W), orange is 4.7-microns (F470N), and red is 7.7-microns (F770W). Credit: NASA, ESA, CSA, STScI
Offentlig
Mikko Tuomi

Extremely Large Telescope should be able to gather spectra not just on #exoplanets that transit their #star, but also from non-transiting exoplanets via reflected starlight.

It should be possible to make clear and accurate distinctions for nearby star systems.

For the closest star, #Proxima Centauri, we could detect #life on an Earth-like world Proxima b with only 10 hours of observations.

#astronomy #astrobiology
phys.org/news/2025-03-extremel

Phys.org · Extremely Large Telescope could sense hints of life at Proxima Centauri in just 10 hours, simulations suggestAv Brian Koberlein
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