An X-ray measurement of Titan's atmospheric extent from its transit of the Crab Nebula

Abstract

Saturn's largest satellite, Titan, transited the Crab Nebula on 5 January 2003. We observed this astronomical event with the {\it Chandra} X-ray Observatory. An ``occultation shadow'' has clearly been detected and is found to be larger than the diameter of Titan's solid surface. The difference gives a thickness for Titan's atmosphere of 880 $\pm$ 60 km. This is the first measurement of Titan's atmospheric extent at X-ray wavelengths. The value measured is consistent with or slightly larger than those estimated from earlier Voyager observations at other wavelengths. We discuss the possibility of temporal variations in the thickness of Titan's atmosphere.

arXiv comment14 pages, 5 figures, AASTeX preprint. Accepted for publication in the Astrophysical Journal

References in corpus (2)

• Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula
• Improvement of the Spatial Resolution of the ACIS Using Split Pixel Events

Cited by in corpus (4)

• X-rays from solar system objects
• Titan brighter at twilight than in daylight
• New Measurement of the Vertical Atmospheric Density Profile from Occultations of the Crab Nebula with X-Ray Astronomy Satellites Suzaku and Hitomi
• Measurement of the vertical atmospheric density profile from the X-ray Earth occultation of the Crab Nebula with Insight-HXMT