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Dust processing in the Carina nebula region

Onaka, Takashi; Okada, Yoko; Mori, Tamami I.

Dust processing in the Carina nebula is investigated based on mid- to far-infrared spectroscopy with Infrared Space Observatory (ISO). Mapping observations over a central 40^‧ ×20^‧ area of the nebula with PHT-S, SWS, and LWS onboard ISO not only reveal spectroscopically that the mid-infrared unidentified infrared (UIR) bands a…

Analysis of CO₂ non-LTE emissions at 4.3µm in the Martian atmosphere as observed by PFS/Mars Express and SWS/ISO

López-Puertas, M.; López-Moreno, J. J.; Lellouch, E. +5 more

Daytime nadir spectra of the Martian atmosphere taken by the planetary Fourier spectrometer/Mars Express (PFS) and by the infrared space observatory (ISO) in the 4.3µm region are analyzed using a theoretical non-LTE model of the CO₂ infrared emissions in that atmosphere. Averaged spectra from these instruments show a double peak s…

A Martian PFS average spectrum: Comparison with ISO SWS

Lellouch, E.; Encrenaz, T.; Piccioni, G. +13 more

The evaluation of the planetary Fourier spectrometer performance at Mars is presented by comparing an average spectrum with the ISO spectrum published by Lellouch et al. [2000. Planet. Space Sci. 48, 1393.]. First, the average conditions of Mars atmosphere are compared, then the mixing ratios of the major gases are evaluated. Major and minor bands…

The far-infrared spectra of Jupiter and Saturn

Lellouch, E.; Encrenaz, T.; Orton, G. S. +4 more

We present far-infrared, disk-averaged spectra of Jupiter and Saturn that were measured with the Long Wavelength Spectrometer aboard the Infrared Space Observatory. The Long Wavelength Spectrometer covered the wavelength region between 43 and 197 µm and achieved in grating mode a resolving power of 150-300.

The spectra observed in the f…

Composition and origin of the atmosphere of Jupiter - an update, and implications for the extrasolar giant planets

Wong, M. H.; Atreya, S. K.; Owen, T. C. +2 more

New developments have led to this update of the composition and origin of Jupiter's atmosphere that were originally discussed in our Planet. Space Sci. 47 (1999) 1243 paper. Since Jupiter can provide important insight into the atmospheres of extrasolar giant planets (EGP), we also discuss here the possible implications of the first detection of an…

Chemical sources of haze formation in Titan's atmosphere

Atreya, S. K.; Wilson, E. H.

A prominent feature of Titan's atmosphere is a thick haze region that acts as the end product of hydrocarbon and nitrile chemistry. Using a one-dimensional photochemical model, an investigation into the chemical mechanisms responsible for the formation of this haze region is conducted. The model derives profiles for Titan's atmospheric constituent…

ISO observations of the giant planets and Titan: what have we learnt?

Encrenaz, Thérèse

Infrared spectroscopic observations of the giant planets and Titan with the Infrared Space Observatory (ISO) have brought a significant contribution to our knowledge of these objects. The main discoveries achieved by ISO are: (1) the first detection of an external oxygen source for all giant planets and Titan; (2) the first detection of new strato…

Remote sounding of the Martian dust from ISO spectroscopy in the 2.7 µm CO ₂ bands

Lellouch, E.; de Graauw, T.; Feuchtgruber, H. +2 more

This paper presents a study of Martian aerosols based on the spectral observations near 2.7 µm. Simulations by Titov et al. [Planet. Space Sci. 48 (2000) 67] showed that the depth and the shape of saturated 2.7 µm band of atmospheric CO ₂ are sensitive to the presence of aerosols. This allows one to determine the aerosol opt…

Asteroids in the infrared - Serendipitous observations with ISO

Müller, T. G.

The infrared space observatory (ISO) observed many asteroids in great detail, including near-Earth asteroids (NEA). Additionally, a large number of observing programmes contain serendipitous observations of known and unknown solar system objects (SSO). The ISO specific constraints, like sensitivity, visibility and orbit parallax and their conseque…

The 2.4- 45 µm spectrum of Mars observed with the infrared space observatory

Lellouch, E.; Encrenaz, T.; de Graauw, T. +6 more

The spectrum of Mars at 2.4- 45 µm has been observed on July 31, 1997 ( L_s=157°) by the short-wavelength spectrometer of the Infrared Space Observatory. The data consist of a high signal to noise, complete grating spectrum (resolving power R∼1500-2500) and portions of the 20- 40 µm spectrum observed in Fabry-Perot mode ( R∼3…