Everything about The Rossiter-mclaughlin Effect totally explained
The
Rossiter-McLaughlin effect is a
spectroscopic phenomenon observed when either an
eclipsing binary's secondary star or an
extrasolar planet is seen to
transit across the face of the primary or parent star. As a main star rotates on its axis, one quadrant of the
photosphere will be seen to be coming towards the viewer, and the other quadrant seen to be moving away. These produce differing
redshifts in the star's spectrum, usually observed as a broadening of the
spectral lines. When the secondary star or planet transits the primary, it blocks off part of the solar disc, obscuring some of the red- or
blue-shifted light from reaching the observer. This causes the observed mean redshift of the primary star as a whole to vary from its previous value. As the transiting object moves across to the other side of the star's disc, so the redshift anomaly will switch from being negative to being positive, or vice versa.
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