New Measurements Of Spin-orbit Angles In Planetary And Binary Star Systems

Details New Measurements Of Spin-orbit Angles In Planetary And Binary Star Systems New Measurements Of Spin-orbit Angles In Planetary And Binary Star Systems

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0602a&link_type=abstract

American Astronomical Society, ESS meeting #2, #6.02

Astronomy and Astrophysics

Astronomy

Scientific paper

In this talk I will present new measurements of the
Rossiter-McLaughlin (RM) effect to determine spin-orbit angles for
exoplanetary systems and binary star systems, and discuss the
implications for the formation of close-in planets and close binary
stars. Five new observations of transiting planets were
undertaken with the newly-installed Planet Finding Spectrograph at the
Magellan observatory. Particular attention will be given to
statistical biases associated with fitting low signal-to-noise RM
data, in which care must be taken to avoid deriving a seemingly
significant result when one has observed only noise. This problem has
not yet been recognized by the community, but is similar to a more
familiar problem that occurs when measuring orbital eccentricity. This
issue will become more important for spin-orbit measurements of
smaller planets, or Kepler planets with faint host stars. Finally I
will present new results from our "BANANA" survey of close binary
systems, including some misaligned systems similar to the case of DI
Herculis. Measurements such as these are fundamental input to theories
of binary star formation and may help to interpret the observed
diversity of spin-orbit angles among exoplanetary systems.

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