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HATS-4b: A dense hot Jupiter transiting a super metal-rich G star

Development of the HATSouth project was funded by NSFMRI ngrant NSF/AST-0723074, operations have been supported by nNASA grants NNX09AB29G and NNX12AH91H, and followup nobservations receive partial support from grant NSF/AST- n1108686. A.J. acknowledges support from FONDECYT project n1130857, BASAL CATA PFB-06, and projects IC120009 “Millennium nInstitute of Astrophysics (MAS)” and P10-022-F of the nMillennium Science Initiative, Chilean Ministry of Economy. nR.B. and N.E. are supported by CONICYT-PCHA/Doctorado nNacional. R.B. acknowledges additional support from Nucleus nP10-022-F of the Millennium Science Initiative, Chilean Ministry nof Economy. V.S. acknowledges support form BASAL nCATA PFB-06. M.R. acknowledges support from FONDECYT npostdoctoral fellowship 3120097. Australian access to the Magellan Telescopeswas supported nthrough the National Collaborative Research Infrastructure nStrategy of the Australian Federal Government. Work at the Australian National University is supported by nARC Laureate Fellowship Grant FL0992131. We acknowledge nthe use of the AAVSO Photometric All-Sky Survey (APASS), nfunded by the RobertMartin Ayers Sciences Fund, NASA’s Astrophysics nData System Bibliographic Services, and the SIMBADdatabase, noperated at CDS, Strasbourg, France. Operations nat the MPG/ESO 2.2 m Telescope are jointly performed by the nMax Planck Gesellschaft and the European Southern Observatory.

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 (v sini = 9.0kms −1 ), 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 1kms −1 . Subject headings: planetary systems — stars: individual (HATS-3, GSC 6926-00454) techniques: spectroscopic, photometric

HATS-6b: A warm saturn transiting an early m dwarf star, and a set of empirical relations for characterizing k and m dwarf planet hosts

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.

HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity

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 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 0:16 MJ, a radius of 1:14 0:03 RJ, and an equilibrium temperature of 1567 30 K. The host star has a mass of 0:88 0:04 M and a radius of 0:89 0:02 R , and it shows starspot activity. We characterized the stellar activity by analyzing 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 A). The two light curves contain anomalies compatible with starspots on the photosphere of the host star along the same transit chord.

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

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

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HATS-5b: A transiting hot saturn from the HATsouth survey

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HATS-13b and HATS-14b: Two transiting hot Jupiters from the HATSouth survey

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HATS-25B THROUGH HATS-30B: A HALF–DOZEN NEW INFLATED TRANSITING HOT JUPITERS FROM THE HATSOUTH SURVEY*

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HAT-South: A global network of southern hemisphere automated telescopes to detect transiting exoplanets

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