Astrophys. J., 749, 134 (2012/April-3)
HAT-P-17b,c: a transiting, eccentric, hot Saturn and a long-period, cold Jupiter.
HOWARD A.W., BAKOS G.A., HARTMAN J., TORRES G., SHPORER A., MAZEH T., KOVACS G., LATHAM D.W., NOYES R.W., FISCHER D.A., JOHNSON J.A., MARCY G.W., ESQUERDO G.A., BEKY B., BUTLER R.P., SASSELOV D.D., STEFANIK R.P., PERUMPILLY G., LAZAR J., PAPP I. and SARI P.
Abstract (from CDS):
We report the discovery of HAT-P-17b,c, a multi-planet system with an inner transiting planet in a short-period, eccentric orbit and an outer planet in a 4.4 yr, nearly circular orbit. The inner planet, HAT-P-17b, transits the bright V = 10.54 early K dwarf star GSC 2717-00417, with an orbital period P = 10.338523±0.000009 days, orbital eccentricity e = 0.342±0.006, transit epoch Tc= 2454801.16943±0.00020 (BJD: barycentric Julian dates throughout the paper are calculated from Coordinated Universal Time (UTC)), and transit duration 0.1690±0.0009 days. HAT-P-17b has a mass of 0.534±0.018 MJ and radius of 1.010±0.029 RJ yielding a mean density of 0.64±0.05 g/cm3. This planet has a relatively low equilibrium temperature in the range 780-927 K, making it an attractive target for follow-up spectroscopic studies. The outer planet, HAT-P-17c, has a significantly longer orbital period P 2= 1610±20 days and a minimum mass m2 sin i2= 1.31+0.18–0.15 MJ. The orbital inclination of HAT-P-17c is unknown as transits have not been observed and may not be present. The host star has a mass of 0.86 ± 0.04 M☉, radius of 0.84±0.02 R☉, effective temperature 5246±80 K, and metallicity [Fe/H] = 0.00±0.08. HAT-P-17 is the second multi-planet system detected from ground-based transit surveys.
planetary systems - stars: individual (HAT-P-17, GSC 2717-00417) - techniques: photometric - techniques: spectroscopic
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<Available at CDS (J/ApJ/749/134): table1.dat table3.dat>
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