Reconnaissance of the hr 8799 exosolar system. I. near-infrared spectroscopy

L. C. Roberts, 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 & 13 others E. Rice, J. E. Roberts, L. C. Roberts, M. Shao, A. Sivaramakrishnan, R. Soummer, T. Truong, G. Vasisht, A. Veicht, F. Vescelus, J. K. Wallace, C. Zhai, N. Zimmerman

Research output: Contribution to journalArticle

Abstract

We obtained spectra in the wavelength range λ = 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 CH4 along with NH3 and/or C2H2, and possibly CO2 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.

Original languageEnglish (US)
Article number24
JournalAstrophysical Journal
Volume768
Issue number1
DOIs
StatePublished - May 1 2013

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reconnaissance
infrared spectroscopy
planets
near infrared
planet
planetary systems
speckle
data reduction
Saturn
instrumentation
luminosity
time measurement
retarding
telescopes
wavelength
color
stars
wavelengths

Keywords

  • instrumentation: adaptive optics
  • instrumentation: spectrographs
  • methods: data analysis
  • planetary systems
  • stars: individual (HR 8799)
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Roberts, L. C., Oppenheimer, B. R., Baranec, C., Beichman, C., Brenner, D., Burruss, R., ... Zimmerman, N. (2013). Reconnaissance of the hr 8799 exosolar system. I. near-infrared spectroscopy. Astrophysical Journal, 768(1), [24]. https://doi.org/10.1088/0004-637X/768/1/24

Reconnaissance of the hr 8799 exosolar system. I. near-infrared spectroscopy. / Roberts, L. C.; Oppenheimer, B. R.; Baranec, C.; Beichman, C.; Brenner, D.; Burruss, R.; Cady, E.; Crepp, J. R.; Dekany, R.; Fergus, R.; Hale, D.; Hillenbrand, L.; Hinkley, S.; Hogg, David W.; King, D.; Ligon, E. R.; Lockhart, T.; Nilsson, R.; Parry, I. R.; Pueyo, L.; Rice, E.; Roberts, J. E.; Roberts, L. C.; Shao, M.; Sivaramakrishnan, A.; Soummer, R.; Truong, T.; Vasisht, G.; Veicht, A.; Vescelus, F.; Wallace, J. K.; Zhai, C.; Zimmerman, N.

In: Astrophysical Journal, Vol. 768, No. 1, 24, 01.05.2013.

Research output: Contribution to journalArticle

Roberts, LC, Oppenheimer, BR, Baranec, C, Beichman, C, Brenner, D, Burruss, R, Cady, E, Crepp, JR, Dekany, R, Fergus, R, Hale, D, Hillenbrand, L, Hinkley, S, Hogg, DW, King, D, Ligon, ER, Lockhart, T, Nilsson, R, Parry, IR, Pueyo, L, Rice, E, Roberts, JE, Roberts, LC, Shao, M, Sivaramakrishnan, A, Soummer, R, Truong, T, Vasisht, G, Veicht, A, Vescelus, F, Wallace, JK, Zhai, C & Zimmerman, N 2013, 'Reconnaissance of the hr 8799 exosolar system. I. near-infrared spectroscopy', Astrophysical Journal, vol. 768, no. 1, 24. https://doi.org/10.1088/0004-637X/768/1/24
Roberts LC, Oppenheimer BR, Baranec C, Beichman C, Brenner D, Burruss R et al. Reconnaissance of the hr 8799 exosolar system. I. near-infrared spectroscopy. Astrophysical Journal. 2013 May 1;768(1). 24. https://doi.org/10.1088/0004-637X/768/1/24
Roberts, L. C. ; Oppenheimer, B. R. ; Baranec, C. ; Beichman, C. ; Brenner, D. ; Burruss, R. ; Cady, E. ; Crepp, J. R. ; Dekany, R. ; Fergus, R. ; Hale, D. ; Hillenbrand, L. ; Hinkley, S. ; Hogg, David W. ; King, D. ; Ligon, E. R. ; Lockhart, T. ; Nilsson, R. ; Parry, I. R. ; Pueyo, L. ; Rice, E. ; Roberts, J. E. ; Roberts, L. C. ; Shao, M. ; Sivaramakrishnan, A. ; Soummer, R. ; Truong, T. ; Vasisht, G. ; Veicht, A. ; Vescelus, F. ; Wallace, J. K. ; Zhai, C. ; Zimmerman, N. / Reconnaissance of the hr 8799 exosolar system. I. near-infrared spectroscopy. In: Astrophysical Journal. 2013 ; Vol. 768, No. 1.
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AU - Baranec, C.

AU - Beichman, C.

AU - Brenner, D.

AU - Burruss, R.

AU - Cady, E.

AU - Crepp, J. R.

AU - Dekany, R.

AU - Fergus, R.

AU - Hale, D.

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AU - Hinkley, S.

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AU - Rice, E.

AU - Roberts, J. E.

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AU - Shao, M.

AU - Sivaramakrishnan, A.

AU - Soummer, R.

AU - Truong, T.

AU - Vasisht, G.

AU - Veicht, A.

AU - Vescelus, F.

AU - Wallace, J. K.

AU - Zhai, C.

AU - Zimmerman, N.

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