Rossiter-McLaughlin effect

How many planets have had their Rossiter-McLaughlin effect measured? So far, I know of only eight...

CoRoT-Exo-2 b	7.2°
HAT-P-1 b	3.7°
HD 17156 b	9.4°
HD 147506 b (HAT-P-2 b)	14°
HD 149026 b	-12°
HD 189733 Ab	-1.4°
HD 209458 b	-4.4°
TrES-1 b	30°

Are there any more?

Neither I do know what is this effect. Shame on me XD

What is it?

When a planet transits its star, a small wave-like feature in the radial velocity data. As the planet starts the transit, it blocks a bit of the light from the stellar hemisphere that is moving toward the telescope (due to stellar rotation), while the other hemisphere which is moving away from the telescope is unblocked. This causes a tiny change in the RV data, and shows up as a tiny dip or depression in the RV curve. As the planet moves to the centre of the stellar disk, the depression rises to normal, then heads up, as the planet is transiting the other stellar hemisphere, the one moving away from the telescope. The shape of the wave can indicate the angle between the orbit of the planet and the rotation of the star.

Excellent, thanks

Misaligned spin-orbit in the XO-3 planetary system?

XO-3b - 70 ± 15°

p.s. shouldn't this be in Planetology rather than Worldbuilding?

Uhm, likely.

Lazarus wrote:

Misaligned spin-orbit in the XO-3 planetary system?

XO-3b - 70 ± 15°

Ah, thank-you!

Lazarus wrote:

p.s. shouldn't this be in Planetology rather than Worldbuilding?

I wasn't sure where to put it, actually. I'll move it.

This paper, http://arxiv.org/abs/0807.4929 , gives the Spin-Orbit alignment for HD 189733 b, HD 209458 b, HAT-P-1 b, CoRoT-Exo-2 b, HD 17156 b, TrES-2 b, HAT-P-2 b, HD 149026 b, XO-3 b, WASP-14 b, and TrES-1 b.

Hmm. Don't you think most planets that are measured by transiting would have had this measured? Or does this require a separate measuring method to detect from regular transiting methods?

It requires sufficiently accurate radial velocity measurements, and a sufficient amount of them. I think those are somewhat hard to come by for a lot of transiting planets, as they typically orbit dim stars.

For example, with HD 189733 b, we have lots and good RV measurements, and the Rossiter-McLaughlin effect is easily visible:


But with WASP-1, we have less measurements, and they're not as accurate:

Ah I sees.

My searches have turned up nothing that hasn't already been stated. However why not ask some of the other extrasolar sites like the extrasolar planetary encyclopedia or remake the list whatmoungh had started to include these things into there data so that we might have a list of this and other effects of extrasolar systems? That way we can find these things out alot more quickly and more easily.

Maybe I should put this into suggestions.....

That's a pretty good idea. If you want, contact Jean Schneider at the Extrasolar Planets Encyclopaedia and give him the idea.