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Educated search for transiting habitable planets. Targetting M dwarfs with known transiting planets | | M. Gillon
; X. Bonfils
; B.-O. Demory
; S. Seager
; D. Deming
; | | Date: |
25 Feb 2010 | | Abstract: | Because the planets of a system form in a flattened disk, they are expected
to share similar orbital inclinations at the end of their formation. The
photometric monitoring of stars known to host a transiting planet could thus
reveal the transits of one or more other planets. Depending on several
parameters, significantly enhanced transit probability could be expected for
habitable planets. This approach is especially interesting for M dwarfs because
these stars have close-in habitable zones and because their small radii make
possible the detection of terrestrial planets down to Mars size. We investigate
the potential of this approach for the two M dwarfs known to host a transiting
planet, GJ 436 and GJ 1214. Contrary to GJ 436, GJ 1214 reveals to be a very
promising target for the considered approach. Assuming a distribution of
orbital inclinations similar to our solar system, a habitable planet orbiting
around GJ 1214 would have a mean transit probability of ~25%, much better than
the probability of 1.5% expected if the transits of GJ 1214b are not
considered. Because of the small size of GJ 1214, a ground-based photometric
monitoring of this star could detect the transit of a habitable planet as small
as the Earth, while a space-based monitoring (e.g., with Warm Spitzer) could
detect any transiting habitable planet down to the size of Mars. A dedicated
high-precision photometric monitoring of M dwarfs known to harbor close-in
transiting planets could thus be an efficient way to detect transiting
habitable planets much smaller than our Earth that would be out of reach for
existing Doppler and transit surveys. | | Source: | arXiv, 1002.4702 | | Services: | Forum | Review | PDF | Favorites | |
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