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HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey

Author(s): Espinoza, N; Bayliss, D; Hartman, JD; Bakos, Gaspar Aron; Jordán, A; et al

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Abstract: We report six new inflated hot Jupiters (HATS-25b through HATS-30b) discovered using the HATSouth global network of automated telescopes. The planets orbit stars with V magnitudes in the range of ∼12–14 and have masses in the largely populated 0.5 0.7 M M J J – region of parameter space but span a wide variety of radii, from 1.17RJ to 1.75RJ . HATS-25b, HATS-28b, HATS-29b, and HATS-30b are typical inflated hot Jupiters (Rp J = 1.17 1.26 – R ) orbiting G–type stars in short period (P = 3.2-4.6 days) orbits. However, HATS-26b (Rp J = 1.75R , P = 3.3024 days) and HATS-27b (Rp J = 1.50R , P = 4.6370 days) stand out as highly inflated planets orbiting slightly evolved F stars just after and in the turn–off points, respectively, which are among the least dense hot Jupiters, with densities of 0.153 - g cm 3 and 0.180 - g cm 3, respectively. All the presented exoplanets but HATS-27b are good targets for future atmospheric characterization studies, while HATS-27b is a prime target for Rossiter—McLaughlin monitoring in order to determine its spin–orbit alignment given the brightness (V = 12.8) and stellar rotational velocity (v i sin 9.3 » km s−1 ) of the host star. These discoveries significantly increase the number of inflated hot Jupiters known, contributing to our understanding of the mechanism(s) responsible for hot Jupiter inflation.
Publication Date: Oct-2016
Electronic Publication Date: 4-Oct-2016
Citation: Espinoza, N, Bayliss, D, Hartman, JD, Bakos, GÁ, Jordán, A, Zhou, G, Mancini, L, Brahm, R, Ciceri, S, Bhatti, W, Csubry, Z, Rabus, M, Penev, K, Bento, J, de Val-Borro, M, Henning, T, Schmidt, B, Suc, V, Wright, DJ, Tinney, CG, Tan, TG, Noyes, R. (2016). HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey. \aj, 152 (108 - 108. doi:10.3847/0004-6256/152/4/108
DOI: doi:10.3847/0004-6256/152/4/108
Type of Material: Journal Article
Journal/Proceeding Title: Astronomical Journal
Version: Final published version. This is an open access article.

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