Rossiter-McLaughlin effect

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Rossiter-McLaughlin effect

Post by Sirius_Alpha on 5th July 2008, 5:28 pm

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 b30°

Are there any more?

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Re: Rossiter-McLaughlin effect

Post by Edasich on 6th July 2008, 6:25 am

Neither I do know what is this effect. Shame on me XD
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Re: Rossiter-McLaughlin effect

Post by Stalker on 6th July 2008, 8:23 am

What is it?
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Re: Rossiter-McLaughlin effect

Post by Sirius_Alpha on 6th July 2008, 9:32 am

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.



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Re: Rossiter-McLaughlin effect

Post by Edasich on 7th July 2008, 4:48 am

Excellent, thanks Wink
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Re: Rossiter-McLaughlin effect

Post by Lazarus on 7th July 2008, 7:21 am

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

XO-3b - 70 ± 15°

p.s. shouldn't this be in Planetology rather than Worldbuilding?
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Re: Rossiter-McLaughlin effect

Post by Edasich on 7th July 2008, 7:47 am

Uhm, likely.
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Re: Rossiter-McLaughlin effect

Post by Sirius_Alpha on 7th July 2008, 3:08 pm

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.

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Re: Rossiter-McLaughlin effect

Post by Sirius_Alpha on 31st July 2008, 8:12 pm

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.

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Re: Rossiter-McLaughlin effect

Post by Darkness nova on 2nd August 2008, 6:15 pm

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?

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Re: Rossiter-McLaughlin effect

Post by Sirius_Alpha on 2nd August 2008, 6:41 pm

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:

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Re: Rossiter-McLaughlin effect

Post by Darkness nova on 3rd August 2008, 1:42 pm

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.....

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Re: Rossiter-McLaughlin effect

Post by Sirius_Alpha on 3rd August 2008, 1:49 pm

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

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Re: Rossiter-McLaughlin effect

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