A short-period super-Earth orbiting the M2.5 dwarf GJ 3634

Bonfils, X.; Gillon, M.; Forveille, T.; Delfosse, X.; Deming, D.; Demory, B.-O.; Lovis, C.; Mayor, M.; Neves, V.; Perrier, C.; Santos, N. C.; Seager, S.; Udry, S.; Boisse, I.; Bonnefoy, M. (2011). A short-period super-Earth orbiting the M2.5 dwarf GJ 3634. Astronomy and astrophysics, 528, A111. EDP Sciences 10.1051/0004-6361/201015981

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We report on the detection of GJ 3634b, a super-Earth of mass and period P = 2.64561 ± 0.00066 day. Its host star is a M2.5 dwarf, has a mass of 0.45 ± 0.05 M⊙, a radius of 0.43 ± 0.03 R⊙ and lies 19.8 ± 0.6 pc away from our Sun. The planet is detected after a radial-velocity campaign using the ESO/Harps spectrograph. GJ 3634b had an a priori geometric probability to undergo transit of ~7% and, if telluric in composition, a non-grazing transit would produce a photometric dip of ≲0.1%. We therefore followed-up upon the RV detection with photometric observations using the 4.5-μm band of the IRAC imager onboard Spitzer. Our six-hour long light curve excludes that a transit occurs for 2σ of the probable transit window, decreasing the probability that GJ 3634b undergoes transit to ~0.5%.

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