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Characterization of material around the centaur (2060) Chiron from a visible and near-infrared stellar occultation in 2011
- Publication Year :
- 2019
-
Abstract
- The centaur (2060) Chiron has exhibited outgassing behaviour and possibly hosts a ring system. On 2011 November 29, Chiron occulted a fairly bright star (R approximately 15 mag) as observed from the 3-m NASA Infrared Telescope Facility (IRTF) on Mauna Kea and the 2-m Faulkes Telescope North (FTN) at Haleakala. Data were taken as visible wavelength images and simultaneous, low-resolution, near-infrared (NIR) spectra. Here, we present a detailed examination of the light-curve features in the optical data and an analysis of the near-infrared spectra. We place a lower limit on the diameter of Chiron's nucleus of 160.2+/-1.3 km. Sharp, narrow dips were observed between 280-360 km from the centre (depending on event geometry). For a central chord and assumed ring plane, the separated features are 298.5 to 302 and 308 to 310.5 km from the nucleus, with normal optical depth approximately 0.5-0.9, and a gap of 9.1+/-1.3 km. These features are similar in equivalent depth to Chariklo's inner ring. The absence of absorbing or scattering material near the nucleus suggests that these sharp dips are more likely to be planar rings than a shell of material. The region of relatively-increased transmission is within the 1:2 spin-orbit resonance, which is consistent with the proposed clearing pattern for a non-axisymmetric nucleus. Characteristics of additional, azimuthally incomplete features are presented, which are likely to be transient, as well as detection of an extended shell or diffuse ring from approximately 900-1500 km. There are no significant features in the NIR light curves, nor any correlation between optical features and NIR spectral slope.<br />Submitted to MNRAS: 13 pages, 10 figures, 3 tables
- Subjects :
- Earth and Planetary Astrophysics (astro-ph.EP)
Physics
010504 meteorology & atmospheric sciences
Scattering
Near-infrared spectroscopy
Infrared telescope
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
01 natural sciences
Spectral line
law.invention
Telescope
Space and Planetary Science
law
Asteroid
0103 physical sciences
Spectral slope
010303 astronomy & astrophysics
Optical depth
0105 earth and related environmental sciences
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....dfc707934f107a40e8651e702566c742