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

Research output: Contribution to journalArticle

77 Scopus citations

Abstract

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
Volume716
Issue number1
DOIs
StatePublished - Jan 1 2010

Keywords

  • Instrumentation: adaptive optics
  • Planets and satellites: atmospheres

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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