Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by tesh90 on 25th October 2012, 8:22 am

Should it not be PH1 ABbCD? Did I get it wrong or does the planet go around only A and B and not ABC and D.

Just a thought.

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by jyril on 25th October 2012, 9:08 am

If PH1 is the star's name, the designation could be PH1(AB) b. The CD pair has nothing to do with it (unless the planet orbited both pairs, in which case it would be PH1(ABCD) b).

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Sirius_Alpha on 25th October 2012, 11:21 am

The paper refers to the stars as AA, AB, BA and BB. So I would expect (AB)b to be a circumquartinary planet in this case.

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by tommi59 on 25th October 2012, 2:18 pm

Right jyril planet is not orbiting distant pair of stars only AB


Last edited by tommi59 on 28th October 2012, 11:05 am; edited 1 time in total

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by jyril on 25th October 2012, 11:35 pm

Sirius_Alpha wrote:The paper refers to the stars as AA, AB, BA and BB. So I would expect (AB)b to be a circumquartinary planet in this case.

I see. Don't stars in hierarchical binaries usually have lowercase letter designations (i.e. Aa+Ab, Ba+Bb?) In this case the planet would be PH1(AaAb)b. A planet around a single star would be PH1Aab... confusing.

PH1Ab where "A" refers to the binary doesn't work either because it mixes up with the designation of secondary companion of the primary binary star...

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Sirius_Alpha on 26th October 2012, 1:28 am

jyril wrote:PH1Ab where "A" refers to the binary doesn't work either because it mixes up with the designation of secondary companion of the primary binary star...
That's why I propose PH1 (A)b. If we denote circumbinary planets by placing the host star(s) in parentheses, then either PH1 (A)b or PH1 (AA,AB)b would work.

jyril wrote:Don't stars in hierarchical binaries usually have lowercase letter designations (i.e. Aa+Ab, Ba+Bb?)
I've seen it both ways, but I think it would be confusing to start using lower-case letters for stars when planets already use them.

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Lazarus on 26th October 2012, 7:16 am

jyril wrote:I see. Don't stars in hierarchical binaries usually have lowercase letter designations (i.e. Aa+Ab, Ba+Bb?)
Yes, the paper uses these Aa/Ab, Ba/Bb. This is the normal binary star convention, which would be even more confusing to change. Planet designations can be viewed as being part of this system with an implied "A", as described here.

I'm not such a fan of using (A), here's why: suppose we find another star in the system converting the A subsystem into a triple:

((Aa-Ab)-Ac)-(Ba-Bb)

The designation then has to reflect the fact the planet orbits Aa and Ab but not Ac.

My preference is A(ab)b for the planet, it indicates which stars are orbited, doesn't needlessly repeat the fact that the planet is in the A subsystem, and is stable if an outer stellar companion is found in the A subsystem.

If on the other hand we find that star Ab is binary, for example:

(Aa-(Ab1-Ab2))-(Ba-Bb)

The designation will still reflect the hierarchy of the system.

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Sirius_Alpha on 26th October 2012, 8:28 am

Good point about the (A)b idea. I hadn't thought of that.

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Daniel on 27th October 2012, 7:19 pm

PH1= Kepler-64b

Kepler Mission Manager Update

http://www.nasa.gov/mission_pages/kepler/news/keplerm-20121026.html

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Edasich on 28th October 2012, 4:14 am

Oh, nice. It was getting difficult to memorize that ID Laughing

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Lazarus on 28th October 2012, 11:32 am

I find it quite interesting that the Kepler people don't use the parentheses convention when it seems to have found some footing in studies of post-common envelope binaries.

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Edasich on 28th October 2012, 11:48 am

What about Kepler-64 A(ab)b?

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Sirius_Alpha on 28th October 2012, 1:03 pm

I've changed the thread title accordingly. Anyone know if the planet is retaining the PH1 designation?

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by tommi59 on 28th October 2012, 1:50 pm

Is not fair to changed name

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Re: Kepler-64 (KIC 4862625) - Circumbinary Planet in a Quadruple System (PH1)

Post by Lazarus on 4th April 2013, 2:02 pm

According to the PlanetHunters blog, the paper is now accepted for publication.
http://blog.planethunters.org/2013/03/29/ph1-paper-offically-accepted-for-publication/

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