HATS-59b,c: A Transiting Hot Jupiter and a Cold Massive Giant Planet around a Sun-like Star

P. Sarkis, Th Henning, J. D. Hartman, G. A. Bakos, R. Brahm, A. Jordán, D. Bayliss, L. Mancini, N. Espinoza, M. Rabus, Z. Csubry, W. Bhatti, K. Penev, G. Zhou, J. Bento, T. G. Tan, P. Arriagada, R. P. Butler, J. D. Crane, S. ShectmanC. G. Tinney, D. J. Wright, B. Addison, S. Durkan, V. Suc, L. A. Buchhave, M. De Val-Borro, J. Lázár, I. Papp, P. Sári

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We report the first discovery of a multi-planetary system by the HATSouth network, HATS-59b,c, a planetary system with an inner transiting hot Jupiter and an outer cold massive giant planet, which was detected via radial velocity. The inner transiting planet, HATS-59b, is on an eccentric orbit with ℓ = 0.129 ± 0.049, orbiting a V = 13.951 ± 0.030 mag solar-like star (M∗ =1.038 ± 0.039 Mo and R∗ = 1.036 ± 0.067 Ro) with a period of 5.416081 ± 0.000016 days. The outer companion, HATS-59c is on a circular orbit with m sin i = 12.70 ± 0.87 MJ and a period of 1422 ± 14 days. The inner planet has a mass of 0.806 ± 0.069 MJ and a radius of 1.126 ± 0.077 RJ, yielding a density of 0.70 ± 0.16 g cm-3. Unlike most planetary systems that include only a single hot Jupiter, HATS-59b,c includes, in addition to the transiting hot Jupiter, a massive outer companion. The architecture of this system is valuable for understanding planet migration.

Original languageEnglish (US)
Article number216
JournalAstronomical Journal
Issue number5
StatePublished - Nov 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • photometric
  • planetary systems
  • stars: individual (HATS-59)
  • techniques: spectroscopic


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