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Numerous multiple star systems with exoplanets

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#1 Far Star

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Posted 18 November 2019 - 02:51 PM

Interesting article about double, triple and quadruple star systems with exoplanets:

 

https://www.uni-jena...systeme_en.html

 

 


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#2 nirvanix

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Posted 21 November 2019 - 04:51 PM

That brings to mind quite a few sci-fi movies I've seen in which people live on a planet with more than one sunset.


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#3 Daniel Mounsey

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Posted 26 November 2019 - 08:42 AM

Nice article thanks for sharing. smile.gif


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#4 ssmith

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Posted 04 December 2019 - 07:26 PM

Far Star -

I have read this paper several times and found it to be very interesting. Thanks for posting.

It highlights many of the methodologies commonly used to determine physicality of binaries as well as uses a few new techniques that are a are a result of GAIA specific data. As an aside - it does seem to treat GAIA parallaxes as hard numbers and not squishy values as discussed in another thread

One of the new things it brought to my attention was the existence of low-mass white dwarf stars (mass less than 0.3 M sun) which are thought to be the result of close-binary systems.

One of the Systems it discusses is Kepler 779 (a M class dwarf) which has an earth sized planet (Kepler 779b) and a low-mass white dwarf companion. The system goes by the WDS designation KOI-1146.

The WDS data gives the magnitudes as 12.6 and 20 but these are near IR values. The primary does show up in the ALADIN DSS images so I thought I would try to image it. The mag 20 secondary was clearly beyond my reach but a J-K magnitude conversion showed that the visual magnitude of the primary should be a 15-16 magnitude object.

I did manage to capture the primary though it appears according to my measures to be a bit fainter than predicted. The red color of the primary shows nicely. Here is my result: 26 frames x 45 sec ISO1600.

kepler 779 lyr c9 12-3-19 26fr.jpg

Edited by ssmith, 04 December 2019 - 08:47 PM.

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#5 Far Star

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Posted 05 December 2019 - 05:28 AM

Steve -

 

This is an impressive photo. In addition to the clearly recognizable color of the red dwarf, the brightness comparison with other stars in the vicinity is particularly interesting. A very successful work!

 

Ulrich



#6 ssmith

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Posted 05 December 2019 - 08:13 AM

Here is the Panstarrs photo of Kepler 779 from the paper which clearly shows the white dwarf secondary. The two fainter red stars just to the right also do not show up in my photo.

85F09FAB-23D4-4F46-90DB-BF8A740E94B6.jpeg
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#7 dmdouglass

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Posted 05 December 2019 - 09:28 AM

Here is the Panstarrs photo of Kepler 779 from the paper which clearly shows the white dwarf secondary. The two fainter red stars just to the right also do not show up in my photo.

attachicon.gif 85F09FAB-23D4-4F46-90DB-BF8A740E94B6.jpeg

Interesting to look at the "article" image, and then have your image, side by side.

Pretty amazing shots !




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