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25 April 2024 |
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Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy | B. R. Oppenheimer
; C. Baranec
; C. Beichman
; D. Brenner
; R. Burruss
; E. Cady
; J. R. Crepp
; R. Dekany
; R. Fergus
; D. Hale
; L. Hillenbrand
; S. Hinkley
; David W. Hogg
; D. King
; E. R. Ligon
; T. Lockhart
; R. Nilsson
; I. R. Parry
; L. Pueyo
; E. Rice
; J. E. Roberts
; L. C. Roberts, Jr.
; M. Shao
; A. Sivaramakrishnan
; R. Soummer
; T. Truong
; G. Vasisht
; A. Veicht
; F. Vescelus
; J. K. Wallace
; C. Zhai
; N. Zimmerman
; | Date: |
11 Mar 2013 | Abstract: | We obtained spectra, in the wavelength range lambda = 995 - 1769 nm, of all
four known planets orbiting the star HR 8799. Using the suite of
instrumentation known as Project 1640 on the Palomar 5-m Hale Telescope, we
acquired data at two epochs. This allowed for multiple imaging detections of
the companions and multiple extractions of low-resolution (R ~ 35) spectra.
Data reduction employed two different methods of speckle suppression and
spectrum extraction, both yielding results that agree. The spectra do not
directly correspond to those of any known objects, although similarities with L
and T-dwarfs are present, as well as some characteristics similar to planets
such as Saturn. We tentatively identify the presence of CH_4 along with NH_3
and/or C_2H_2, and possibly CO_2 or HCN in varying amounts in each component of
the system. Other studies suggested red colors for these faint companions, and
our data confirm those observations. Cloudy models, based on previous
photometric observations, may provide the best explanation for the new data
presented here. Notable in our data is that these presumably co-eval objects of
similar luminosity have significantly different spectra; the diversity of
planets may be greater than previously thought. The techniques and methods
employed in this paper represent a new capability to observe and rapidly
characterize exoplanetary systems in a routine manner over a broad range of
planet masses and separations. These are the first simultaneous spectroscopic
observations of multiple planets in a planetary system other than our own. | Source: | arXiv, 1303.2627 | Services: | Forum | Review | PDF | Favorites |
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