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Proceedings Article

Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI)

[+] Author Affiliations
S. Renard, O. Absil, J.-P. Berger, T. Forveille, F. Malbet

Lab. d'Astrophysique de l'Observatoire de Grenoble (France)

X. Bonfils

Observatório Astronómico de Lisboa (Portugal)

Proc. SPIE 7013, Optical and Infrared Interferometry, 70132Z (July 14, 2008); doi:10.1117/12.790494
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From Conference Volume 7013

  • Optical and Infrared Interferometry
  • Marseille, France | June 23, 2008

abstract

In this paper, we study the feasibility of obtaining near-infrared spectra of bright extrasolar planets with the 2nd generation VLTI Spectro-Imager instrument (VSI), which has the required angular resolution to resolve nearby hot Extrasolar Giant Planets (EGPs) from their host stars. Taking into account fundamental noises, we simulate closure phase measurements of several extrasolar systems using four 8-m telescopes at the VLT and a low spectral resolution (R = 100). Synthetic planetary spectra from T. Barman are used as an input. Standard χ2-fitting methods are then used to reconstruct planetary spectra from the simulated data. These simulations show that low-resolution spectra in the H and K bands can be retrieved with a good fidelity for half a dozen targets in a reasonable observing time (about 10 hours, spread over a few nights). Such observations would strongly constrain the planetary temperature and albedo, the energy redistribution mechanisms, as well as the chemical composition of their atmospheres. Systematic errors, not included in our simulations, could be a serious limitation to these performance estimations. The use of integrated optics is however expected to provide the required instrumental stability (around 10-4 on the closure phase) to enable the first thorough characterisation of extrasolar planetary emission spectra in the near-infrared.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

S. Renard ; O. Absil ; J.-P. Berger ; X. Bonfils ; T. Forveille, et al.
"Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI)", Proc. SPIE 7013, Optical and Infrared Interferometry, 70132Z (July 14, 2008); doi:10.1117/12.790494; http://dx.doi.org/10.1117/12.790494


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