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BEGIN:VEVENT
DTSTAMP:20260506T191838Z
DTSTART;VALUE=DATE-TIME:20211027T163000
DTEND;VALUE=DATE-TIME:20211027T180000
SUMMARY:Colloquium: Kevin Heng
TZID:Europe/London
UID:20211027-8a1785d87c93a326017c9922666d1b2b@warwick.ac.uk
CREATED:20211019T151951Z
DESCRIPTION:“The Atmospheres of Exoplanets: Albedos and Phase Curves of C
 elestial Bodies” Abstract: The albedo of a celestial body is the fractio
 n of incident starlight reflected by it. The study of the albedos of Sol
 ar System objects is at least a century old\, at least in the Western wo
 rld. As examples: Bond (1861) speculated on the near-unity albedo of Jup
 iter\, while Russell (1916) observed the opposition surge of the Moon ne
 ar and at full phase. The light of a planet or moon varying with orbital
  phase is known as its phase curve. Modern astronomical facilities have 
 enabled the measurement of phase curves of reflected light and thermal e
 mission from exoplanets (e.g. Kepler\, TESS\, CHEOPS\, Hubble\, Spitzer)
 \, which enables the investigation of atmospheric dynamics and aerosols.
  In the current talk\, I will concisely review and discuss historically 
 important work\, including seminal contributions by Seeliger (1888)\, Ch
 andrasekhar (1960)\, Sobolev (1975) and Hapke (1981). These introduction
 s set the stage for a detailed discussion of our recent work on generali
 sing these classic works to derive closed-form\, ab initio solutions for
  the geometric albedo and reflected light phase curve. This novel theore
 tical framework is applied to Kepler space telescope data of the hot Jup
 iter Kepler-7b\, where we demonstrate that one may infer fundamental aer
 osol (single-scattering albedo\, scattering asymmetry factor) and atmosp
 heric (geometric albedo\, Bond albedo\, phase integral) properties from 
 precise photometry alone\, thus providing powerful complementary informa
 tion to spectra. Another case study are the Cassini phase curves of Jupi
 ter\, which were measured in the early 2000s by the Cassini space missio
 n but never subjected to Bayesian inference. By inverting the Cassini ph
 ase curves\, we infer that aerosols in the Jovian atmosphere are large\,
  irregular\, polydisperse particles that may be responsible for causing 
 coherent backscattering of sunlight. The full schedule for the ����TV P
 hysics Colloquium can be found here.
LOCATION:
URL:/fac/sci/physics/news/colloquium/?calendarItem=8
 a17841b7c5550db017c617f3a294660
ATTACH:/fac/sci/physics/news/colloquium/?calendarIte
 m=8a17841b7c5550db017c617f3a294660
CATEGORIES:Colloquium,Virtual
LAST-MODIFIED:20211019T151951Z
ORGANIZER;CN=James Blake:
END:VEVENT
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