Reference : Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Im...
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Prospects for near-infrared characterisation of hot Jupiters with the VLTI Spectro-Imager (VSI)
Renard, Stéphanie [Université Joseph Fourier - Grenoble 1 - UJF > Laboratoire d'Astrophysique de Grenoble > > >]
Absil, Olivier mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Berger, J.-P. [Lab. d'Astrophysique de l'Observatoire de Grenoble (France)]
Bonfils, X. [Observatório Astronómico de Lisboa (Portugal)]
Forveille, T. [Lab. d'Astrophysique de l'Observatoire de Grenoble (France)]
Malbet, F. [Lab. d'Astrophysique de l'Observatoire de Grenoble (France)]
Optical and Infrared Interferometry
Schöller, Markus
Danchi, William
Delplancke, Françoise
Proceedings of the SPIE, volume 7013
Optical and Infrared Interferometry
23/06/2008 - 28/06/2008
[en] Hot EGPs ; Interferometry ; VSI
[en] 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 chi[SUP]2[/SUP]-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[SUP]-4[/SUP] on the closure phase) to enable the first thorough characterisation of extrasolar planetary emission spectra in the near-infrared.
Copyright 2008 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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