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alfa015
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The search for habitable exoplanets in Alpha Centauri

26 Oct 2019 12:13

In October 2012, astronomers announced the discovery of an exoplanet orbiting the star Alpha Centauri B. However, three years later, they concluded that it probably doesn’t exist. In 2013, astronomers also detected another possible exoplanet, but it hasn’t been confirmed yet. As of today, no exoplanets have been discovered around Alpha Centauri A or B.

There are several ongoing projects to search for habitable exoplanets in Alpha Centauri:

The Expresso spectrograph, which started operating in October 2018, is able to detect radial velocities of less than 10 cm/s.

Another promising instrument is called NEAR, which stands for Near Earths in the AlphaCen Region. NEAR is a thermal infrared coronagraph that blocks most of the light coming from Alpha Centauri in order to resolve possible exoplanets around the star. This coronagraph can detect exoplanets 2 times the radius of the Earth.

Project Blue is another interesting project that might help us discover the closest Earth-like planet. It is a small space telescope with a coronagraph that will directly image the habitable zones of the Alpha Centauri system. The telescope will be able to detect exoplanets between 0.5 and 1.5 times the radius of the Earth. The launch of the telescope is expected to take place in 2023.

NASA is also working on a space telescope with coronagraph called ACEND, which stands for Alpha Centauri Direct Imager.

Breakthrough Initiatives is now working on a space telescope called TOLIBOY that will use astrometry to map the motion of the Alpha Centauri stars and search for a perturbation in the positions. The telescope is expected to be launched in 2021.

Source: https://www.youtube.com/watch?v=hYEpxEVXmZc

Do you think all the agencies and companies should join efforts and build just 1 big space coronagraph, or, as they seem to be doing now, work on different ones?
 
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Salvo
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The search for habitable exoplanets in Alpha Centauri

28 Oct 2019 01:13

I think they'll work on different ones and then work together for the same goal.
It's a good thing to have multiple instruments looking at the same thing, so you can be sure is not an artifact or a false positive.
The universe is not required to be in perfect harmony with human ambition.

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midtskogen
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The search for habitable exoplanets in Alpha Centauri

28 Oct 2019 06:58

At least one very powerful flare has been observed emitted from Alpha Centauri B, which would quickly toast most Earth life including humans, so any planets would not be "habitable" in the literal sense.
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The search for habitable exoplanets in Alpha Centauri

29 Oct 2019 03:42

midtskogen wrote:
At least one very powerful flare has been observed emitted from Alpha Centauri B, which would quickly toast most Earth life including humans, so any planets would not be "habitable" in the literal sense.

These red dwarfs might be a no go for life.  We should stick with sunlike stars like Tau Ceti and Epsilon Eridani which have a much higher chance for life.

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