Abstract
We report the discovery of four transiting hot Jupiters from the HATSouth survey: HATS-39b, HATS-40b, HATS-41b, and HATS-42b. These discoveries add to the growing number of transiting ...planets orbiting moderately bright (12.5 ≲ V ≲ 13.7) F dwarf stars on short (2-5 d) periods. The planets have similar radii, ranging from $1.33^{+0.29}_{-0.20}$ RJ for HATS-41b to $1.58^{+0.16}_{-0.12}$ RJ for HATS-40b. Their masses and bulk densities, however, span more than an order of magnitude. HATS-39b has a mass of 0.63 ± 0.13 MJ, and an inflated radius of 1.57 ± 0.12 RJ, making it a good target for future transmission spectroscopic studies. HATS-41b is a very massive 9.7 ± 1.6 MJ planet and one of only a few hot Jupiters found to date with a mass over 5 MJ. This planet orbits the highest metallicity star (Fe/H = 0.470 ± 0.010) known to host a transiting planet and is also likely on an eccentric orbit. The high mass, coupled with a relatively young age ($1.34^{+0.31}_{-0.51}$ Gyr) for the host star, is a factor that may explain why this planet's orbit has not yet circularized.
We report the discovery of HATS-1b, a transiting extrasolar planet orbiting the moderately bright V = 12.05 G dwarf star GSC 6652-00186, and the first planet discovered by HATSouth, a global network ...of autonomous wide-field telescopes. HATS-1b has a period of P approximately 3.4465 days, mass of M sub(p) approximately 1.86 M sub(J), and radius of R sub(p) approximately 1.30 R sub(J). The host star has a mass of 0.99 M sub(odot) and radius of 1.04 R sub(odot). The discovery light curve of HATS-1b has near-continuous coverage over several multi-day timespans, demonstrating the power of using a global network of telescopes to discover transiting planets.
We report the discovery of two transiting extrasolar planets by the HATSouth survey. HATS-9b orbits an old (10.8 + or - 1.5 Gyr) V = 13.3 G dwarf star with a period P approximately 1.9153 days. The ...host star has a mass of 1.03 M sub(odot), radius of 1.503 Rodot, and effective temperature 5366 + or - 70 K. The planetary companion has a mass of 0.837 M sub(J) and radius of 1.065 R sub(J), yielding a mean density of 0.85 g cm super(-3). HATS-10b orbits a V = 13.1 G dwarf star with a period P approximately 3.3128 days. The host star has a mass of 1.1 M sub(odot), radius of 1.11 R sub(odot), and effective temperature 5880 + or - 120 K. The planetary companion has a mass of 0.53 M sub(J) and radius of 0.97 R sub(J), yielding a mean density of 0.7 g cm super(-3). Both planets are compact in comparison with planets receiving similar irradiation from their host stars and lie in the nominal coordinates of Field 7 of K2, but only HATS-9b falls on working silicon. Future characterization of HATS-9b with the exquisite photometric precision of the Kepler telescope may provide measurements of its reflected light signature.
We report on the result of a campaign to monitor 25 HATSouth candidates using the Kepler space telescope during Campaign 7 of the K2 mission. We discover HATS-36b (EPIC 215969174b, K2-145b), an ...eccentric ( ) hot Jupiter with a mass of and a radius of , which transits a solar-type G0V star (V = 14.386) in a -day period. We also refine the properties of three previously discovered HATSouth transiting planets (HATS-9b, HATS-11b, and HATS-12b) and search the K2 data for TTVs and additional transiting planets in these systems. In addition, we also report on a further three systems that remain as Jupiter-radius transiting exoplanet candidates. These candidates do not have determined masses, however pass all of our other vetting observations. Finally, we report on the 18 candidates that we are now able to classify as eclipsing binary or blended eclipsing binary systems based on a combination of the HATSouth data, the K2 data, and follow-up ground-based photometry and spectroscopy. These range in periods from 0.7 day to 16.7 days, and down to 1.5 mmag in eclipse depths. Our results show the power of combining ground-based imaging and spectroscopy with higher precision space-based photometry, and serve as an illustration as to what will be possible when combining ground-based observations with TESS data.
We report the discovery of four transiting extrasolar planets (HAT-P-34b-HAT-P-37b) with masses ranging from 1.05 to 3.33 M sub(J) and periods from 1.33 to 5.45 days. These planets orbit relatively ...bright F and G dwarf stars (from V = 10.16 to V = 13.2). Of particular interest is HAT-P-34b which is moderately massive (3.33 M sub(J)), has a high eccentricity of e = 0.441 + or - 0.032 at a period of P = 5.452654 + or - 0.000016 days, and shows hints of an outer component. The other three planets have properties that are typical of hot Jupiters.
We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 + or - 0.012 MsubJ, a radius of 0.563 + 0.046 - 0.034 RsubJ, and an orbital period of ...3.1853 days. The host star is a moderately bright K dwarf star with a mass of 0.849 + or - 0.027 MsubS, a radius of 0.815 + 0.049 - 0.035 RsubS, and a metallicity of Fe/H= +0.250 + or - 0.080. HATS-7b, which, together with the recently discovered HATS-8b, is one of the first two transiting Neptunes discovered in the Southern sky, is a prime target for additional follow-up observations with southern hemisphere facilities to characterize the atmospheres of super-Neptunes.
We report the discovery of two transiting extrasolar planets from the HATSouth survey. HATS-11, a V= 14.1 G0-star shows a periodic 12.9 mmag dip in its light curve every 3.6192 days and a radial ...velocity variation consistent with a Keplerian orbit. HATS-11 has a mass of 1.000 + or - 0.060 M sub(middot in circle), a radius of 1.444 + or - 0.057 R sub(middot in circle) and an effective temperature of 6060 + or - 150 K, while its companion is a 0.85+ or - 0.12 M sub(J), 1.510 + or - 0.078 R sub(J) planet in a circular orbit. HATS-12 shows a periodic 5.1 mmag flux decrease every 3.1428 days and Keplerian RV variations around a V= 12.8 F-star. HATS-12 has a mass of 1.489 +or- 0.071 M sub(middot in circle), a radius of 2.21+ or -0.21 R sub(middot in circle), and an effective temperature of 6408 + or - 75 K. For HATS-12b, our measurements indicate that this is a 2.38 + or - 0.11M sub(J), 1.35 + or - 0.17 R sub(J) planet in a circular orbit. Both host stars show subsolar metallicities of -0.390 + or - 0.060 dex and -0.100 + or - 0.040 dex, respectively, and are (slightly) evolved stars. In fact, HATS-11 is among the most metal-poor and, HATS-12, with a log gmow * of 3.923 + or - 0.065, is among the most evolved stars hosting a hot-Jupiter planet. Importantly, HATS-11 and HATS-12 have been observed in long cadence by Kepler as part of K2 campaign 7 (EPIC216414930 and EPIC218131080 respectively).
Abstract
We report the discovery of three moderately high-mass transiting hot Jupiters from the HATSouth survey: HATS-22b, HATS-23b and HATS-24b. These planets add to the number of known planets in ...the ∼2M
J regime. HATS-22b is a 2.74 ± 0.11 M
J mass and
$0.953_{-0.029}^{+0.048}\,R_{\rm J}$
radius planet orbiting a V = 13.455 ± 0.040 sub-solar mass (M
* = 0.759 ± 0.019 M⊙; R
* = 0.759 ± 0.019 R⊙) K-dwarf host star on an eccentric (e = 0.079 ± 0.026) orbit. This planet's high planet-to-stellar mass ratio is further evidence that migration mechanisms for hot Jupiters may rely on exciting orbital eccentricities that bring the planets closer to their parent stars followed by tidal circularization. HATS-23b is a 1.478 ± 0.080 M
J mass and 1.69 ± 0.24 R
J radius planet on a grazing orbit around a V = 13.901 ± 0.010 G-dwarf with properties very similar to those of the Sun (M
* = 1.115 ± 0.054; R
* = 1.145 ± 0.070). HATS-24b orbits a moderately bright V = 12.830 ± 0.010 F-dwarf star (M
* = 1.218 ± 0.036 M⊙;
$R_\star = 1.194_{-0.041}^{+0.066}\,\mathrm{R}_{\odot }$
). This planet has a mass of
$2.39_{-0.12}^{+0.21}\,M_{\rm J}$
and an inflated radius of
$1.516_{-0.065}^{+0.085}\,R_{\rm J}$
.
We report the discovery of HAT-P-31b, a transiting exoplanet orbiting the V = 11.660 dwarf star GSC 2099-00908. HAT-P-31b is the first planet discovered with the Hungarian-made Automated Telescope ...(HAT) without any follow-up photometry, demonstrating the feasibility of a new mode of operation for the HATNet project. The 2.17 MJ , 1.1 RJ planet has a period of Pb = 5.0054 days and maintains an unusually high eccentricity of eb = 0.2450 ? 0.0045, determined through Keck, FIbr-fed Echelle Spectrograph, and Subaru high-precision radial velocities (RVs). Detailed modeling of the RVs indicates an additional quadratic residual trend in the data detected to very high confidence. We interpret this trend as a long-period outer companion, HAT-P-31c, of minimum mass 3.4 MJ and period >=2.8 years. Since current RVs span less than half an orbital period, we are unable to determine the properties of HAT-P-31c to high confidence. However, dynamical simulations of two possible configurations show that orbital stability is to be expected. Further, if HAT-P-31c has non-zero eccentricity, our simulations show that the eccentricity of HAT-P-31b is actively driven by the presence of c, making HAT-P-31 a potentially intriguing dynamical laboratory.
Abstract
We report the first discovery of a multi-planetary system by the HATSouth network, HATS-59b,c, a planetary system with an inner transiting hot Jupiter and an outer cold massive giant planet, ...which was detected via radial velocity. The inner transiting planet, HATS-59b, is on an eccentric orbit with
, orbiting a
mag solar-like star (
=
and
) with a period of
days. The outer companion, HATS-59c is on a circular orbit with
and a period of 1422 ± 14 days. The inner planet has a mass of
and a radius of
, yielding a density of
. Unlike most planetary systems that include only a single hot Jupiter, HATS-59b,c includes, in addition to the transiting hot Jupiter, a massive outer companion. The architecture of this system is valuable for understanding planet migration.
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