ExSSII: mo' better planets

We're back, we're tanned, we're rested, we're ready: 4th day, session 7,
in which Kepler annouces the discovery of the second circumbinary exoplanet...

Ok, we're not going yet, but the press release came out at noon:

- 41d orbital period binary star, KV primary (bit less massive than the Sun).
Secondary is an M star.
Sub-solar metallicity, low eccentricity stellar orbit (e1=0.15)

about 60 pc away.

Planet is transiting, natch, 0.33 MJM
in a 229d near circular circumbinary orbit.

This is the second circumbinary planet discovered, after 1620-26b and the first orbiting two main sequence stars.

Press release

More like this

Planets in binaries and star clusters: session 7 of Extreme Solar Systems II planets around binaries? in clusters? crazy stuff... and we are live... Carter - from Kepler on transiting circumbinary planets Obviuous Star Wars quip Some eclipse timing variations in 3 eclipsing stellar binaries,…
30 new planets reported at "Towards Other Earths" Porto conference. Some of them are rather interesting. The Extrasolar Planet Encyclopaedia reported 30 new planets reported by 7 different teams at the Towards Other Earths conference in Porto - wish I could have been there, too many meetings…
By Dr. Franck Marchis, SETI Institute Kepler-16 is another great discovery coming from the Kepler telescope, the 10th NASA Discovery mission which is devoted to finding Earth-size exoplanets by monitoring variations of brightness due to transit. Today the Kepler team found a circumbinary exoplanet…
By Dr. Laurance Doyle, an astrophysicist at the SETI Institute, and lead author of a paper that will appear in the journal Science on September 15, 2011. For the first time, astronomers with the NASA Kepler spacecraft mission have discovered a planet orbiting two stars. This is a fundamentally…

This is the second circumbinary planet discovered, after 1620-26b

So what about HW Virginis, DP Leonis, HU Aquarii, NN Serpentis, and UZ Fornacis?

Interesting, was any particular reason given why these candidates should be regarded as less reliable than, say, RV planet detections?

On the other hand B1620-26 is clearly irrelevant and not worth considering because it is a pulsar planet (same reason as why various RV planet people can keep claiming that they've found the "smallest known exoplanet" when their super-Earths exceed the mass of the innermost PSR B1257+12 planet by several orders of magnitude...)

Concern that the ETV might be due to stellar companions or other effects - he rattled a couple off, don't know if they're plausible alternatives quantitatively

I think next IAU conference may have the "planets are only around main sequence stars" issue surface, in conjunction with the refighting of the great "what is a planet" battle.

IAU already has a "an exoplanet is what we would call a planet in our solar system, but around another star" clause.

I almost wanna see astronomers explain to the public why the Earth will no longer be a planet when the Sun becomes a white dwarf?
And what about giants? Sub-giants?

We'll need lots of popcorn.
And beer.