Multi-band, multi-epoch observations of the transiting warm Jupiter wasp-80b

Akihiko Fukui, Yui Kawashima, Masahiro Ikoma, Norio Narita, Masahiro Onitsuka, Yoshifusa Ita, Hiroki Onozato, Shogo Nishiyama, Haruka Baba, Tsuguru Ryu, Teruyuki Hirano, Yasunori Hori, Kenji Kurosaki, Kiyoe Kawauchi, Yasuhiro H. Takahashi, Takahiro Nagayama, Motohide Tamura, Nobuyuki Kawai, Daisuke Kuroda, Shogo NagayamaKouji Ohta, Yasuhiro Shimizu, Kenshi Yanagisawa, Michitoshi Yoshida, Hideyuki Izumiura

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24 Citations (Scopus)


WASP-80b is a warm Jupiter transiting a bright late-K/early-M dwarf, providing a good opportunity to extend the atmospheric study of hot Jupiters toward the lower temperature regime. We report multi-band, multi-epoch transit observations of WASP-80b by using three ground-based telescopes covering from optical (g′, R c, and I c bands) to near-infrared (NIR; J, H, and K s bands) wavelengths. We observe 5 primary transits, each in 3 or 4 different bands simultaneously, obtaining 17 independent transit light curves. Combining them with results from previous works, we find that the observed transmission spectrum is largely consistent with both a solar abundance and thick cloud atmospheric models at a 1.7σ discrepancy level. On the other hand, we find a marginal spectral rise in the optical region compared to the NIR region at the 2.9σ level, which possibly indicates the existence of haze in the atmosphere. We simulate theoretical transmission spectra for a solar abundance but hazy atmosphere, finding that a model with equilibrium temperature of 600 K can explain the observed data well, having a discrepancy level of 1.0σ. We also search for transit timing variations, but find no timing excess larger than 50 s from a linear ephemeris. In addition, we conduct 43 day long photometric monitoring of the host star in the optical bands, finding no significant variation in the stellar brightness. Combined with the fact that no spot-crossing event is observed in the five transits, our results confirm previous findings that the host star appears quiet for spot activities, despite the indications of strong chromospheric activities.

Original languageEnglish
Article number108
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 2014 Aug 1


  • planetary systems
  • planets and satellites: atmospheres
  • planets and satellites: individual (WASP-80b)
  • stars: individual (WASP-80)
  • techniques: photometric


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