The #Rossiter-#McLaughlin effect is also called the spectroscopic transit. Since the #star is rotating, one side is coming towards us and is blue-shifted while the other side is moving away from us and is red-shifted. As the planet is crossing the stellar disk, it blocks a part of the blue-, then red-shifted part. The Rossiter-McLaughlin is a radial velocity anomaly during transit.

#HIP41378

GIF from my Phd student Salomé GROUFFAL (LAM / AMU / CNES / Institut origines).

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Very preliminary plot of the #HARPS-N radial-velocity data of #HIP41378 f obtained last night with the #TNG at #LaPalma.

It shows the #Rossiter-#McLaughlin effect that is clearly detected and in phase with the photometric ingress.

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#Astronomy #AstronomerLife