Thermal infrared MMTAO observations of the HR8799 planetary system

Philip M Hinz, Timothy J. Rodigas, Matthew A. Kenworthy, Suresh Sivanandam, Aren N. Heinze, Eric E. Mamajek, Michael R. Meyer

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We present direct imaging observations at wavelengths of 3.3, 3.8 (L′band), and 4.8 (M band) μm, for the planetary system surrounding HR8799. All three planets are detected at L′. The c and d components are detected at 3.3 μm, and upper limits are derived from the M-band observations. These observations provide useful constraints on warm giant planet atmospheres. We discuss the current age constraints on the HR8799 system and show that several potential co-eval objects can be excluded from being co-moving with the star. Comparison of the photometry is made to models for giant planet atmospheres. Models that include non-equilibrium chemistry provide a reasonable match to the colors of c and d. From the observed colors in the thermal infrared, we estimate T eff < 960 K for b and T eff = 1300 and 1170 K for c and d, respectively. This provides an independent check on the effective temperatures and thus masses of the objects from the Marois et al. results.

Original languageEnglish (US)
Pages (from-to)417-426
Number of pages10
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2010



  • Instrumentation: adaptive optics
  • Planets and satellites: atmospheres

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hinz, P. M., Rodigas, T. J., Kenworthy, M. A., Sivanandam, S., Heinze, A. N., Mamajek, E. E., & Meyer, M. R. (2010). Thermal infrared MMTAO observations of the HR8799 planetary system. Astrophysical Journal, 716(1), 417-426.