Tsevi Mazeh

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This Letter reports on the photometric detection of transits of the Neptune-mass planet orbiting the nearby M-dwarf star GJ 436. It is by far the closest, smallest and least massive transiting planet detected so far. Its mass is slightly larger than Neptune's at M = 22.6 ± 1.9 M⊕. The shape and depth of the transit lightcurves show that it is crossing the(More)
We report a spectroscopic orbit with period P = 3.52433 ± 0.00027 days for the planetary companion that transits the solar-type star HD 209458. For the metallicity, mass, and radius of the star we derive [Fe/H]= 0.00 ± 0.02, M * = 1.1 ± 0.1 M ⊙ , and R * = 1.3 ± 0.1 R ⊙. This is based on a new analysis of the iron lines in our HIRES template spectrum, and(More)
We report on the BVRI multi-band follow-up photometry of the transiting extrasolar planet HD 189733b. We revise the transit parameters and find planetary radius R P = 1.154 ± 0.032R J and inclination i P = 85.79 ± 0.24 •. The new density (∼ 1g cm −3) is significantly higher than the former estimate (∼ 0.75g cm −3); this shows that from the current sample of(More)
This paper presents an application of the TwO-Dimensional CORrelation (TODCOR) algorithm to multi-order spectra. The combination of many orders enables the detection and measurement of the radial velocities of very faint companions. The technique is first applied here to the case of HD 41004, where the secondary is 3.68 magnitudes fainter than the primary(More)
We point out an intriguing relation between the masses of the transiting planets and their orbital periods. For the six currently known transiting planets, the data are consistent with a decreasing linear relation. The other known short-period planets, discovered through radial-velocity techniques, seem to agree with this relation. We briefly speculate(More)
We report the discovery of a planet transiting a moderately bright (V = 12.00) G star, with an orbital period of 2.788491 ± 0.000025 days. From the transit light curve we determine that the radius of the planet is R p = 1.257 ± 0.053 R Jup. HAT-P-5b has a mass of M p = 1.06 ± 0.11 M Jup , similar to the average mass of previously-known transiting(More)
We present photometry of 13 transits of XO-3b, a massive transiting planet on an eccentric orbit. Previous data led to two inconsistent estimates of the planetary radius. Our data strongly favor the smaller radius, with increased precision: R p = 1.217 ± 0.073 R Jup. A conflict remains between the mean stellar density determined from the light curve, and(More)
We report the detection of a planetary companion orbiting the solar-type star HD 80606, the brighter component of a wide binary with a projected separation of about 2000 AU. Using high-signal spectroscopic observations of the two components of the visual binary, we show that they are nearly identical. The planet has an orbital period of 111.8 days and a(More)
Most Sun-like stars in the Galaxy reside in gravitationally bound pairs of stars (binaries). Although long anticipated, the existence of a 'circumbinary planet' orbiting such a pair of normal stars was not definitively established until the discovery of the planet transiting (that is, passing in front of) Kepler-16. Questions remained, however, about the(More)