Astrophys. J., 742, 116 (2011/December-1)
HAT-P-20b-HAT-P-23b: four massive transiting extrasolar planets.
BAKOS G.A., HARTMAN J., TORRES G., LATHAM D.W., KOVACS G., NOYES R.W., FISCHER D.A., JOHNSON J.A., MARCY G.W., HOWARD A.W., KIPPING D., ESQUERDO G.A., SHPORER A., BEKY B., BUCHHAVE L.A., PERUMPILLY G., EVERETT M., SASSELOV D.D., STEFANIK R.P., LAZAR J., PAPP I. and SARI P.
Abstract (from CDS):
We report the discovery of four relatively massive (2-7 MJ) transiting extrasolar planets. HAT-P-20b orbits the moderately bright V = 11.339 K3 dwarf star GSC 1910-00239 on a circular orbit, with a period P = 2.875317 ±0.000004 days, transit epoch Tc= 2455080.92661±0.00021 (BJDUTC), and transit duration 0.0770±0.0008 days. The host star has a mass of 0.76 ±0.03 M☉, radius of 0.69±0.02 R☉, effective temperature 4595±80 K, and metallicity [Fe/H] = +0.35±0.08. The planetary companion has a mass of 7.246±0.187 MJ and a radius of 0.867±0.033 RJyielding a mean density of 13.78±1.50 g/cm3. HAT-P-21b orbits the V = 11.685 G3 dwarf star GSC 3013-01229 on an eccentric (e = 0.228±0.016) orbit, with a period P = 4.124481±0.000007 days, transit epoch Tc= 2454996.41312 ±0.00069, and transit duration 0.1530±0.0027 days. The host star has a mass of 0.95±0.04 M☉, radius of 1.10±0.08 R☉, effective temperature 5588±80 K, and metallicity [Fe/H] = +0.01±0.08. The planetary companion has a mass of 4.063±0.161 MJ and a radius of 1.024±0.092 R J yielding a mean density of 4.68+1.59_- 0.99_g/cm3. HAT-P-21b is a borderline object between the pM and pL class planets, and the transits occur near apastron. HAT-P-22b orbits the bright V = 9.732 G5 dwarf star HD 233731 on a circular orbit, with a period P = 3.212220±0.000009 days, transit epoch Tc= 2454930.22001±0.00025, and transit duration 0.1196 ±0.0014 days. The host star has a mass of 0.92±0.03 M☉, radius of 1.04±0.04 R☉, effective temperature 5302±80 K, and metallicity [Fe/H] = +0.24±0.08. The planet has a mass of 2.147±0.061 MJ and a compact radius of 1.080±0.058 RJ yielding a mean density of 2.11+0.40 _- 0.29_ g/cm3. The host star also harbors an M-dwarf companion at a wide separation. Finally, HAT-P-23b orbits the V = 12.432 G0 dwarf star GSC 1632-01396 on a close to circular orbit, with a period P = 1.212884±0.000002 days, transit epoch Tc= 2454852.26464±0.00018, and transit duration 0.0908 ±0.0007 days. The host star has a mass of 1.13±0.04 M☉, radius of 1.20±0.07 R☉, effective temperature 5905±80 K, and metallicity [Fe/H] = +0.15±0.04. The planetary companion has a mass of 2.090±0.111 M J and a radius of 1.368±0.090 RJyielding a mean density of 1.01 ± 0.18 g/cm3. HAT-P-23b is an inflated and massive hot Jupiter on a very short period orbit, and has one of the shortest characteristic infall times (7.5+2.9_- 1.8_Myr) before it gets engulfed by the star.
stars: individual (HAT-P-20, HAT-P-21, HAT-P-22, HAT-P-23) - techniques: photometric - techniques: spectroscopic
VizieR on-line data:
<Available at CDS (J/ApJ/742/116): table8.dat table9.dat table10.dat table11.dat>
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