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

Author(s): Bakos, Gaspar Aron; Penev, K; Bayliss, D; Hartman, Joel D.; Zhou, G; et al

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Abstract: We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 MJ, a radius of 0.563 0.034 0.046 - + RJ, and an orbital period of 3.1853 days. The host star is a moderately bright (V =  13.340 0.010 mag, KS =  10.976 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 M, a radius of 0.815 0.035 0.049 - + R, 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 powerlaw 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 super-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 (which we define as objects with mass greater than that of Neptune, and smaller than halfway between that of Neptune and Saturn, i.e., 0.054 0.18 MM M Jp J < < ).
Publication Date: 10-Nov-2015
Electronic Publication Date: 4-Nov-2015
Citation: Bakos, GÁ, Penev, K, Bayliss, D, Hartman, JD, Zhou, G, Brahm, R, Mancini, L, de Val-Borro, M, Bhatti, W, Jordán, A, Rabus, M, Espinoza, N, Csubry, Z, Howard, AW, Fulton, BJ, Buchhave, LA, Ciceri, S, Henning, T, Schmidt, B, Isaacson, H, Noyes, RW, Marcy, GW, Suc, V, Howe, AR, Burrows, AS, Lázár, J, Papp, I, Sári, P. (2015). HATS-7b: A Hot Super Neptune Transiting a Quiet K Dwarf Star. \apj, 813 (111 - 111. doi:10.1088/0004-637X/813/2/111
DOI: doi:10.1088/0004-637X/813/2/111
Type of Material: Journal Article
Journal/Proceeding Title: Astrophysical Journal
Version: Final published version. This is an open access article.

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