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

P. Sarkis*, Th. Henning, J. D. Hartman, G. A. Bakos, R. Brahm, A. Jordan, 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. Lazar, I. Papp, P. Sari

*Corresponding author for this work

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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 e = 0.129 ± 0.049, orbiting a V = 13.951 ± 0.030 mag solar-like star (M-star = 1.038 ± 0.039 M-circle dot and R-star = 1.036 ± 0.067 R-circle dot) 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
Article number216
JournalAstrophysical Journal
Issue number5
Number of pages11
Publication statusPublished - 2018


  • Photometric
  • Planetary systems
  • Stars: individual (HATS-59)
  • Techniques: spectroscopic

Cite this

Sarkis, P., Henning, T., Hartman, J. D., Bakos, G. A., Brahm, R., Jordan, A., Bayliss, D., Mancini, L., Espinoza, N., Rabus, M., Csubry, Z., Bhatti, W., Penev, K., Zhou, G., Bento, J., Tan, T. G., Arriagada, P., Butler, R. P., Crane, J. D., ... Sari, P. (2018). HATS-59b,c: A Transiting Hot Jupiter and a Cold Massive Giant Planet around a Sunlike Star. Astrophysical Journal, 156(5), [216]. https://doi.org/10.3847/1538-3881/aade54