Proxima Centauri

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Re: Proxima Centauri

Post by Sirius_Alpha on 29th September 2016, 9:39 pm

The Pale Green Dot: A Method to Characterize Proxima Centauri b using Exo-Aurorae
https://arxiv.org/abs/1609.09075

The Space Weather of Proxima Centauri b
https://arxiv.org/abs/1609.09076

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Re: Proxima Centauri

Post by Led_Zep on 29th September 2016, 10:46 pm

http://www.scientificamerican.com/article/how-to-see-proxima-b/

How to See Proxima b

(Scientific American.com)
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Re: Proxima Centauri

Post by Lazarus on 30th September 2016, 6:47 pm

Sirius_Alpha wrote:No Conclusive Evidence for Transits of Proxima b in MOST photometry
http://arxiv.org/abs/1609.08718

Non-detection, but can't be sure it doesn't transit.
The flares look like they're going to be a real problem for this one, both in terms of unambiguously determining whether transits are occurring, and in terms of prospects for habitability.
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Re: Proxima Centauri

Post by Led_Zep on 1st October 2016, 3:45 am

Twitter :

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Re: Proxima Centauri

Post by Led_Zep on 7th October 2016, 10:14 am

Why not an ocean planet ?

https://arxiv.org/abs/1609.09757
Possible Internal Structures and Compositions of Proxima Centauri b
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Re: Proxima Centauri

Post by tommi59 on 7th October 2016, 4:59 pm

We should wait until transit is definitely confirmed or ruled out nevertheless ocean planet is in my opinion unlikely due to proximity to the host star
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Re: Proxima Centauri

Post by Lazarus on 14th November 2016, 2:59 pm

Another application of measuring Proxima's radial velocity: it now looks like it is a bound companion of the Alpha Centauri system with a high degree of probability, which is in contrast to previous results which used less precise radial velocity data.

Kervella & Thévenin "Proxima's orbit around Alpha Centauri"
https://arxiv.org/abs/1611.03495
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Re: Proxima Centauri

Post by Sirius_Alpha on 30th November 2016, 9:25 pm

Upper limits for Mass and Radius of objects around Proxima Cen from SPHERE/VLT
https://arxiv.org/abs/1611.10362

Doesn't look like this covers any parameter space that hasn't already been ruled out by other methods.

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Re: Proxima Centauri

Post by Sirius_Alpha on 12th December 2016, 10:43 pm

Proxima reloaded: Unravelling the stellar noise in radial velocities
https://arxiv.org/abs/1612.03786

Different analysis of data, recovery of Proxima Centauri b. No evidence for a second planet.

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Re: Proxima Centauri

Post by Led_Zep on 22nd December 2016, 6:33 pm

Lazarus wrote:Another application of measuring Proxima's radial velocity: it now looks like it is a bound companion of the Alpha Centauri system with a high degree of probability, which is in contrast to previous results which used less precise radial velocity data.

Kervella & Thévenin "Proxima's orbit around Alpha Centauri"
https://arxiv.org/abs/1611.03495

http://www.eso.org/public/france/announcements/ann16089/

ESO press release :

Orbit of Proxima Centauri Determined After 100 Years
Strongest evidence yet that Proxima Centauri orbits Alpha Centauri pair
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Re: Proxima Centauri

Post by Lazarus on 28th April 2017, 2:33 am

Ribas et al. "The full spectral radiative properties of Proxima Centauri"
https://arxiv.org/abs/1704.08449

There appears to be a ~20% excess in the 3–30μm region of the spectrum, interpreted as evidence of warm dust in the system. Proxima b currently receives about 60 times the XUV flux that Earth does, and may have lost between 0.5 and 2 Earth oceans of water before Proxima's luminosity decreased sufficiently for it to enter the habitable zone. If the water loss mechanism continued for the lifetime of the planet, the total loss (assuming an infinite reservoir) would be 15–25 Earth oceans.
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Re: Proxima Centauri

Post by Led_Zep on 15th July 2017, 3:41 pm

https://reddots.space/proxima-centauri-harps-data-release-1/

Live from La Silla !!!

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Re: Proxima Centauri

Post by Sirius_Alpha on 11th August 2017, 7:54 am

An update on Proxima Centauri planet seach efforts.
https://reddots.space/proxima-harps-data-release-2-and-more/

Data on Proxima remains tricky to interpret. When all datasets are combined together, the signal of Proxima b remains strong and growing in significance, but the new data alone shows only weak evidence of it. This is within the expectation for such a small signal, and the not-so ideal sampling caused by the first weeks of bad weather.
More mysterious is the nature of the longer term signal. Non-random variability remains beyond reasonable doubt, but four candidate periods are equally favoured. Once one of these second signals is added to the model, not much is left on the data.

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Re: Proxima Centauri

Post by Led_Zep on 11th September 2017, 6:23 am

http://www.eso.org/public/images/potw1737a/

ESO : "is Proxima c hiding in this graph?"
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Re: Proxima Centauri

Post by Lazarus on 13th September 2017, 2:19 am

Feng & Jones "Was Proxima captured by alpha Centauri A and B?"
https://arxiv.org/abs/1709.03560

Based on dynamics, it seems that there is a fairly decent chance that Proxima is not an original member of the Alpha Centauri system. There is also evidence that Proxima has a lower metallicity than Alpha Centauri AB, which would also seem to support the capture hypothesis.
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Re: Proxima Centauri

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