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.
@article{arxiv.1306.0624,
title = {HATS-3b: An inflated hot Jupiter transiting an F-type star},
author = {D. Bayliss and G. Zhou and K. Penev and G. Bakos and J. Hartman and A. Jordán and L. Mancini and M. Mohler and V. Suc and M. Rabus and B. Béky and Z. Csubry and L. Buchhave and T. Henning and N. Nikolov and B. Csák and R. Brahm and N. Espinoza and R. Noyes and B. Schmidt and P. Conroy and D. Wright and C. Tinney and B. Addison and P. Sackett and D. Sasselov and J. Lázár and I. Papp and P. Sári},
journal= {arXiv preprint arXiv:1306.0624},
year = {2015}
}