A Third Exoplanetary System with Misaligned Orbital and Stellar Spin Axes

Details A Third Exoplanetary System with Misaligned Orbital and Stellar Spin Axes A Third Exoplanetary System with Misaligned Orbital and Stellar Spin Axes

2009-07-30

arxiv.org/abs/0907.5204v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

8 pages, 5 figures, 3 tables, PASP accepted

Scientific paper

We present evidence that the WASP-14 exoplanetary system has misaligned orbital and stellar-rotational axes, with an angle lambda = 33.1 +/- 7.4 deg between their sky projections. The evidence is based on spectroscopic observations of the Rossiter-McLaughlin effect as well as new photometric observations. WASP-14 is now the third system known to have a significant spin-orbit misalignment, and all three systems have "super-Jupiter" planets (M_P > 3 Mjup) and eccentric orbits. This finding suggests that the migration and subsequent orbital evolution of massive, eccentric exoplanets is somehow different from that of less massive close-in Jupiters, the majority of which have well-aligned orbits.

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