HATS-39b, HATS-40b, HATS-41b, and HATS-42b: Three Inflated Hot Jupiters and a Super-Jupiter Transiting F Stars



We report the discovery of four transiting hot Jupiters from the HATSouth survey: HATS39b, 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{{0.20}^{+0.29}} R_J for HATS-41b to 1.58{{-0.12} ^{+0.16}} R_J for HATS-40b. Their masses and bulk densities, however, span more than an order of magnitude. HATS-39b has a mass of 0.63 ± 0.13M(J), and an inflated radius of 1.57 ± 0.12 R-J, making it a good target for future transmission spectroscopic studies. HATS41b is a very massive 9.7 ± 1.6M_J planet and one of only a few hot Jupiters found to date with a mass over 5 M_J. 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{_{-0.51} ^{+0.31}} Gyr) for the host star, is a factor that may explain why this planet's orbit has not yet circularized.


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Kepler's laws, Telescopes, Photometry--Techniques, Astronomical spectroscopy, Stars, Planetary systems


NSF MRI grant NSF/AST-0723074, 1108686; NASA grants NNX09AB29G, NNX12AH91H, NNX14AE87G and NNX17AB61G; FONDECYT project 1171208; BASAL CATA PFB-06; ARC Laureate Fellowship Grant FL0992131; European Organization for Astronomical Research in the Southern hemisphere programmes 095.C-0367, CN2013A-171, CN2013B-55, CN2014A-104, CN2014B-57, CN2015A-51, and ESO 096.C-0544.


©2018 The Authors