HATSouth Results

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HATSouth Results

Post by Sirius_Alpha on 7th June 2012, 8:32 pm

HATSouth
http://solar-flux.forumandco.com/t1076-hatsouth#7531

HATS-1b: The First Transiting Planet Discovered by the HATSouth Survey
http://arxiv.org/abs/1206.1524

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 P~3.4465 d, mass Mp~1.86MJ, and radius Rp~1.30RJ. The host star has a mass of 0.99Msun, and radius of 1.04Rsun. The discovery light curve of HATS-1b has near continuous coverage over several multi-day periods, demonstrating the power of using a global network of telescopes to discover transiting planets.

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Re: HATSouth Results

Post by Sirius_Alpha on 8th April 2013, 8:42 pm

HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity
http://arxiv.org/abs/1304.2140

We report the discovery of HATS-2b, the second transiting extrasolar planet detected by the HATSouth survey. HATS-2b is moving on a circular orbit around a V=13.6 mag, K-type dwarf star (GSC 6665-00236), at a separation of 0.0230 \pm 0.0003 AU and with a period of 1.3541 days. The planetary parameters have been robustly determined using a simultaneous fit of the HATSouth, MPG/ESO~2.2\,m/GROND, Faulkes Telescope South/Spectral transit photometry and MPG/ESO~2.2\,m/FEROS, Euler~1.2\,m/CORALIE, AAT~3.9\,m/CYCLOPS radial-velocity measurements. HATS-2b has a mass of 1.37 \pm 0.16 M_J, a radius of 1.14 \pm 0.03 R_J and an equilibrium temperature of 1567 \pm 30 K. The host star has a mass of 0.88 \pm 0.04 M_Sun, radius of 0.89 \pm 0.02 R_Sun and shows starspot activity. We characterized the stellar activity by analysing two photometric follow-up transit light curves taken with the GROND instrument, both obtained simultaneously in four optical bands (covering the wavelength range of 3860-9520 \AA). The two light curves contain anomalies compatible with starspots on the photosphere of the parent star along the same transit chord.

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Re: HATSouth Results

Post by Edasich on 5th June 2013, 4:28 am

HATS-3 b - First transiting planet in Capricornus!

HATS-3b: An inflated hot Jupiter transiting an F-type star

We report the discovery by the HATSouth survey of HATS-3b, a transiting extrasolar planet orbiting a V=12.4 F-dwarf star. HATS-3b has a period of P = 3.5479d, mass of Mp = 1.07MJ, and radius of Rp = 1.38RJ. Given the radius of the planet, the brightness of the host star, and the stellar rotational velocity (vsini = 9.0km/s), this system will make an interesting target for future observations to measure the Rossiter-McLaughlin effect and determine its spin-orbit alignment. We detail the low/medium-resolution reconnaissance spectroscopy that we are now using to deal with large numbers of transiting planet candidates produced by the HATSouth survey. We show that this important step in discovering planets produces logg and Teff parameters at a precision suitable for efficient candidate vetting, as well as efficiently identifying stellar mass eclipsing binaries with radial velocity semi-amplitudes as low as 1 km/s.
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Re: HATSouth Results

Post by Edasich on 9th January 2014, 4:22 am

HATS-5 b, transiting hot Saturn in Eridanus. I hope HATS-4 b is coming soon...

HATS-5b: A Transiting hot-Saturn from the HATSouth Survey

We report the discovery of HATS-5b, a transiting hot-Saturn orbiting a G type star, by the HAT-South survey. HATS-5b has a mass of Mp=0.24 Mj, radius of Rp=0.91 Rj, and transits its host star with a period of P=4.7634d. The radius of HATS-5b is consistent with both theoretical and empirical models. The host star has a V band magnitude of 12.6, mass of 0.94 Msun, and radius of 0.87 Rsun. The relatively high scale height of HATS-5b, and the bright, photometrically quiet host star, make this planet a favourable target for future transmission spectroscopy follow-up observations. We reexamine the correlations in radius, equilibrium temperature, and metallicity of the close-in gas-giants, and find hot Jupiter-mass planets to exhibit the strongest dependence between radius and equilibrium temperature. We find no significant dependence in radius and metallicity for the close-in gas-giant population.
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Re: HATSouth Results

Post by Edasich on 27th February 2014, 5:08 am

HATS-4b: A Dense Hot-Jupiter Transiting a Super Metal-Rich G Star

We report the discovery by the HATSouth survey of HATS-4b, an extrasolar planet transiting a V=13.46 mag G star. HATS-4b has a period of P = 2.5167 d, mass of Mp = 1.32 Mj, radius of Rp = 1.02 Rj and density of rho_p = 1.55 +- 0.16 g/cm^3 ~ 1.24 rhoj. The host star has a mass of 1.00 Msun, a radius of 0.92 Rsun and a very high metallicity [Fe/H]= 0.43 +- 0.08. HATS-4b is among the densest known planets with masses between 1-2 Mj and is thus likely to have a significant content of heavy elements of the order of 75 Mearth. In this paper we present the data reduction, radial velocity measurement and stellar classification techniques adopted by the HATSouth survey for the CORALIE spectrograph. We also detail a technique to estimate simultaneously vsini and macroturbulence using high resolution spectra.
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Re: HATSouth Results

Post by Shellface on 30th July 2014, 4:49 pm

You guys are slacking again…

A Spin-Orbit Alignment for the Hot Jupiter HATS-3b

We have measured the alignment between the orbit of HATS-3b (a recently discovered, slightly inflated Hot Jupiter) and the spin-axis of its host star. Data were obtained using the CYCLOPS2 optical-fiber bundle and its simultaneous calibration system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The sky-projected spin-orbit angle of λ = 3 ± 25 was determined from spectroscopic measurements of Rossiter-McLaughlin effect. This is the first exoplanet discovered through the HATSouth transit survey to have its spin-orbit angle measured. Our results indicate that the orbital plane of HATS-3b is consistent with being aligned to the spin axis of its host star. The low obliquity of the HATS-3 system, which has a relatively hot mid F-type host star, agrees with the general trend observed for Hot Jupiter host stars with effective temperatures >6250K to have randomly distributed spin-orbit angles.

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Re: HATSouth Results

Post by Lazarus on 30th July 2014, 6:46 pm

According to the posters listed at Characterizing Planetary Systems Across the HR Diagram, they've found a hot Jupiter orbiting an M dwarf.
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Re: HATSouth Results

Post by Sirius_Alpha on 10th August 2014, 8:17 pm

Lazarus wrote:According to the posters listed at Characterizing Planetary Systems Across the HR Diagram, they've found a hot Jupiter orbiting an M dwarf.

HATS-6b is a hot Saturn orbiting an M dwarf.
http://arxiv.org/list/astro-ph.EP/new

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Re: HATSouth Results

Post by Shellface on 10th August 2014, 9:30 pm

The direct link, for people who are reading this in the future for some reason:

We report the discovery by the HATSouth survey of HATS-6b, an extrasolar planet transiting a V=15.2 mag, i=13.7 mag M1V star with a mass of 0.57 Msun and a radius of 0.57 Rsun. HATS-6b has a period of P = 3.3253 d, mass of Mp=0.32 Mjup, radius of Rp=1.00 Rjup, and zero-albedo equilibrium temperature of Teq=712.8+-5.1 K. HATS-6 is one of the lowest mass stars known to host a close-in gas giant planet, and its transits are among the deepest of any known transiting planet system. We discuss the follow-up opportunities afforded by this system, noting that despite the faintness of the host star, it is expected to have the highest K-band S/N transmission spectrum among known gas giant planets with Teq < 750 K. In order to characterize the star we present a new set of empirical relations between the density, radius, mass, bolometric magnitude, and V, J, H and K-band bolometric corrections for main sequence stars with M < 0.80 Msun, or spectral types later than K5. These relations are calibrated using eclipsing binary components as well as members of resolved binary systems. We account for intrinsic scatter in the relations in a self-consistent manner. We show that from the transit-based stellar density alone it is possible to measure the mass and radius of a ~0.6 Msun star to ~7% and ~2% precision, respectively. Incorporating additional information, such as the V-K color, or an absolute magnitude, allows the precision to be improved by up to a factor of two.
Looks rather low-density, but otherwise a fairly typical Hot Jupiter. Er, Warm Jupiter?

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Re: HATSouth Results

Post by Sirius_Alpha on 11th August 2014, 4:59 am

Shellface wrote:The direct link, for people who are reading this in the future for some reason:
Ah thanks! That's not the first time I've done that.....

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Re: HATSouth Results

Post by Led_Zep on 2nd March 2015, 10:28 pm

http://arxiv.org/abs/1503.00062

HATS-9b AND HATS-10b: TWO COMPACT HOT JUPITERS IN FIELD 7 OF THE K2 MISSION

We report the discovery of two transiting extrasolar planets by the HATSouth survey. HATS-9b orbits an old (10.8 ± 1.5 Gyr) V=13.3 G dwarf star, with a period P = 1.9153 d. The host star has a mass of 1.03 Msun, radius of 1.503 Rsun and effective temperature 5366 ± 70 K. The planetary companion has a mass of 0.837 MJ, and radius of 1.065 RJ yielding a mean density of 0.85 g cm−3 . HATS-10b orbits a V=13.1 G dwarf star, with a period P = 3.3128 d. The host star has a mass of 1.1 Msun, radius of 1.11 Rsun and effective temperature 5880 ± 120 K. The planetary companion has a mass of 0.53 MJ, and radius of 0.97 RJ yielding a mean density of 0.7 g cm−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 characterisation of HATS-9b with the exquisite photometric precision of the Kepler telescope may provide measurements of its reflected light signature.
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Re: HATSouth Results

Post by Sirius_Alpha on 12th March 2015, 2:45 am

HATS-13b and HATS-14b: two transiting hot Jupiters from the HATSouth survey
http://arxiv.org/pdf/1503.03469.pdf

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Re: HATSouth Results

Post by Stalker on 2nd May 2015, 9:04 pm

Shellface wrote:The direct link, for people who are reading this in the future for some reason:

We report the discovery by the HATSouth survey of HATS-6b, an extrasolar planet transiting a V=15.2 mag, i=13.7 mag M1V star with a mass of 0.57 Msun and a radius of 0.57 Rsun. HATS-6b has a period of P = 3.3253 d, mass of Mp=0.32 Mjup, radius of Rp=1.00 Rjup, and zero-albedo equilibrium temperature of Teq=712.8+-5.1 K. HATS-6 is one of the lowest mass stars known to host a close-in gas giant planet, and its transits are among the deepest of any known transiting planet system. We discuss the follow-up opportunities afforded by this system, noting that despite the faintness of the host star, it is expected to have the highest K-band S/N transmission spectrum among known gas giant planets with Teq < 750 K. In order to characterize the star we present a new set of empirical relations between the density, radius, mass, bolometric magnitude, and V, J, H and K-band bolometric corrections for main sequence stars with M < 0.80 Msun, or spectral types later than K5. These relations are calibrated using eclipsing binary components as well as members of resolved binary systems. We account for intrinsic scatter in the relations in a self-consistent manner. We show that from the transit-based stellar density alone it is possible to measure the mass and radius of a ~0.6 Msun star to ~7% and ~2% precision, respectively. Incorporating additional information, such as the V-K color, or an absolute magnitude, allows the precision to be improved by up to a factor of two.
Looks rather low-density, but otherwise a fairly typical Hot Jupiter. Er, Warm Jupiter?

[Astronomy.com] Scientists have discovered an exoplanet with Saturn’s mass and Jupiter’s radius orbiting a small, cool star.

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Re: HATSouth Results

Post by Edasich on 4th June 2015, 4:00 am

Half filling the gap; only numbers 7, 11 and 12 are yet missing...

HATS-8b: A Low-Density Transiting Super-Neptune

HATS-8b is a low density transiting super-Neptune discovered as part of the HATSouth project. The planet orbits its solar-like G dwarf host (V=14.03 ± 0.10 and Teff =5679 ± 50 K) with a period of 3.5839 d. HATS-8b is the third lowest mass transiting exoplanet to be discovered from a wide-field ground based search, and with a mass of 0.138 ± 0.019 MJ it is approximately half-way between the masses of Neptune and Saturn. However HATS-8b has a radius of 0.873 (+0.123,-0.075) RJ, resulting in a bulk density of just 0.259 ± 0.091 g.cm−3. The metallicity of the host star is super-Solar ([Fe/H]=0.210 ± 0.080), arguing against the idea that low density exoplanets form from metal-poor environments. The low density and large radius of HATS-8b results in an atmospheric scale height of almost 1000 km, and in addition to this there is an excellent reference star of near equal magnitude at just 19 arcsecond separation on the sky. These factors make HATS-8b an exciting target for future atmospheric characterization studies, particularly for long-slit transmission spectroscopy.
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Re: HATSouth Results

Post by Edasich on 7th July 2015, 4:16 am

HATS Planet Number 7! Very Happy

HATS-7b: A Hot Super Neptune Transiting a Quiet K Dwarf Star

We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120+/-0.012 M_Jup, a radius of 0.563+0.046-0.034 R_Jup, and an orbital period of 3.1853 days. The host star is a moderately bright (V = 13.340+/-0.010 mag, K_S = 10.976+/-0.026 mag) K dwarf star with a mass of 0.849+/-0.027 M_Sun, a radius of 0.815+0.049-0.035 R_Sun, and a metallicity of [Fe/H]= +0.250+/-0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has low RV jitter, and shows no evidence for chromospheric activity in its spectrum. HATS-7b is the second smallest radius planet discovered by a wide-field ground-based transit survey, and one of only a handful of Neptune-size planets with mass and radius determined to 10% precision. Theoretical modeling of HATS-7b yields a hydrogen-helium fraction of 18+/-4% (rock-iron core and H2-He envelope), or 9+/-4% (ice core and H2-He envelope), i.e.it has a composition broadly similar to that of Uranus and Neptune, and very different from that of Saturn, which has 75% of its mass in H2-He. Based on a sample of transiting exoplanets with accurately (<20%) determined parameters, we establish approximate power-law relations for the envelopes of the mass-density distribution of exoplanets. 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.
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Re: HATSouth Results

Post by Sirius_Alpha on 21st October 2015, 12:11 am

HATS-17b: a dense warm Jupiter with the longest period to date of any planet discovered by ground-based photometry.
http://arxiv.org/abs/1510.05758

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Re: HATSouth Results

Post by Edasich on 20th November 2015, 4:45 am

More HAT-South planets (but EPE is missing numbers 7 and 17 yet)

HATS-15 b and HATS-16 b: Two massive planets transiting old G dwarf stars

We report the discovery of HATS-15 b and HATS-16 b, two massive transiting extrasolar planets orbiting evolved (∼10 Gyr) main-sequence stars. The planet HATS-15 b, which is hosted by a G9V star (V=14.8 mag), is a hot Jupiter with mass of 2.17±0.15MJ and radius of 1.105±0.0.040RJ, and completes its orbit in nearly 1.7 days. HATS-16 b is a very massive hot Jupiter with mass of 3.27±0.19MJ and radius of 1.30±0.15RJ; it orbits around its G3 V parent star (V=13.8 mag) in ∼2.7 days. HATS-16 is slightly active and shows a periodic photometric modulation, implying a rotational period of 12 days which is unexpectedly short given its isochronal age. This fast rotation might be the result of the tidal interaction between the star and its planet.
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Re: HATSouth Results

Post by Sirius_Alpha on 9th March 2016, 10:00 pm

HATS-11b and HATS-12b: Two transiting Hot Jupiters orbiting sub-solar metallicity stars selected for the K2 Campaign 7
http://arxiv.org/abs/1603.02894

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 ± 0.060 M⊙, a radius of 1.444 ± 0.057 M⊙ and an effective temperature of 6060 ± 150 K, while its companion is a 0.85 ± 0.12 MJ, 1.510 ± 0.078 RJ 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 ± 0.071 M⊙, a radius of 2.21 ± 0.21 R⊙, and an effective temperature of 6408 ± 75 K. For HATS-12, our measurements indicate that this is a 2.38 ± 0.11 MJ, 1.35 ± 0.17 RJ planet in a circular orbit. Both host stars show sub-solar metallicity of -0.390 ± 0.060 dex and -0.100 ± 0.040 dex, respectively and are (slightly) evolved stars. In fact, HATS-11 is amongst the most metal-poor and, HATS-12 is amongst 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).

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Re: HATSouth Results

Post by Lazarus on 2nd June 2016, 3:13 pm

Six more inflated hot Jupiters

Espinoza et al. "HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey"
http://arxiv.org/abs/1606.00023
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Re: HATSouth Results

Post by Edasich on 6th June 2016, 3:49 am

HATS-18 b: An Extreme Short--Period Massive Transiting Planet Spinning Up Its Star

We report the discovery by the HATSouth network of HATS-18 b: a 1.980 +/- 0.077 Mj, 1.337 +0.102 -0.049 Rj planet in a 0.8378 day orbit, around a solar analog star (mass 1.037 +/- 0.047 Msun, and radius 1.020 +0.057 -0.031 Rsun) with V=14.067 +/- 0.040 mag. The high planet mass, combined with its short orbital period, implies strong tidal coupling between the planetary orbit and the star. In fact, given its inferred age, HATS-18 shows evidence of significant tidal spin up, which together with WASP-19 (a very similar system) allows us to constrain the tidal quality factor for Sun-like stars to be in the range 6.5 <= lg(Q*/k_2) <= 7 even after allowing for extremely pessimistic model uncertainties. In addition, the HATS-18 system is among the best systems (and often the best system) for testing a multitude of star--planet interactions, be they gravitational, magnetic or radiative, as well as planet formation and migration theories.
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Re: HATSouth Results

Post by Sirius_Alpha on 3rd July 2016, 11:36 pm

HATS-19b, HATS-20b, HATS-21b: Three Transiting Hot-Saturns Discovered by the HATSouth Survey
http://arxiv.org/abs/1607.00322

HATS-31b Through HATS-35b: Five Transiting Hot Jupiters Discovered by the HATSouth Survey
http://arxiv.org/abs/1607.00006

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Re: HATSouth Results

Post by Sirius_Alpha on 4th July 2016, 8:52 pm

More!
HATS-22b, HATS-23b and HATS-24b: Three new transiting Super-Jupiters from the HATSouth Project
http://arxiv.org/abs/1607.00688

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Re: HATSouth Results

Post by Edasich on 5th July 2016, 4:51 am

HATSouth planets galore! Very Happy Laughing

On the other hand I'm a bit bothered by Extrasolar Planet Encyclopedia. Lately they're restricting themselves to update Bibliography only, leaving a lot of (almost weekly or daily) exoplanets patently missing. Evil or Very Mad
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