A Survey of Transit Timing Variations of M Stars Among Kepler’s Targets: Evidence for Possible New Companions

Details A Survey of Transit Timing Variations of M Stars Among Kepler’s Targets: Evidence for Possible New Companions A Survey of Transit Timing Variations of M Stars Among Kepler’s Targets: Evidence for Possible New Companions

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.2503o&link_type=abstract

American Astronomical Society, ESS meeting #2, #25.03

Astronomy and Astrophysics

Astronomy

Scientific paper

As the least massive stars, M stars have the greatest reflex acceleration due
to an orbiting planet. The transit depths and transit times of planets around M stars are
large and well-matched to the temporal resolution of ground-based telescopes as well as
that of Kepler. As a result, M stars have been of particular interest for searching for
planets in both radial velocity and transit photometry surveys. In continuation of our
project to search for planetary companions around M stars, we have monitored the light
curves of over 100 M stars in Kepler’s publicly available data sets Q0 to Q2. We used
four criteria, namely, the magnitude, proper motion, H-Ks and J-H colors, and identified
around 100 M stars in these data sets. A study of the light curves of these stars shows evidence
of possible transiting systems as well as transit timing variations. Using a
model-independent method, we analyzed these TTVs and determined the possibility that they
might be due to planetary companions. We have found that the observed TTV signals in some
of these systems cannot be explained by a constant period. However, they can be explained
assuming that companions, with masses in the planet-mass domain, may be present in the
system. We present the results of our survey and discuss the possibility of the new
planetary candidate(s).

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