Starspots and the dynamic evolution... Jeremy Tregloan-Reed (SETITalks)
Δημοσιεύτηκε στις 19 Μαρ 2015
Full title:
Starspots and the dynamic evolution of hot-Jupiter exoplanet systems
When
a hot-Jupiter transits its host star and crosses an active region there
is a possibility that it will occult a starspot. When this happens a
starspot anomaly is usually seen in the resulting transit lightcurve.
Generally viewed as a nuisance, the most common approach is to remove
the affected data points before performing an analysis to determine the
lightcurve properties. However, when a starspot anomaly is found in
transit photometry it can allow a wealth of information to be
discovered. Apart from determining the physical properties of the
starspot (such as position, size and temperature) if a starspot anomaly
is found in two sets of transit photometry and is due to the same
starspot it is then possible to determine the stellar rotation period at
the given latitude of the starspot. It is also possible to measure the
sky-projected stellar obliquity of the system which can then begin to
shed some light on the primary mechanism of the dynamical evolution of
the system.
Starspots and the dynamic evolution of hot-Jupiter exoplanet systems
When
a hot-Jupiter transits its host star and crosses an active region there
is a possibility that it will occult a starspot. When this happens a
starspot anomaly is usually seen in the resulting transit lightcurve.
Generally viewed as a nuisance, the most common approach is to remove
the affected data points before performing an analysis to determine the
lightcurve properties. However, when a starspot anomaly is found in
transit photometry it can allow a wealth of information to be
discovered. Apart from determining the physical properties of the
starspot (such as position, size and temperature) if a starspot anomaly
is found in two sets of transit photometry and is due to the same
starspot it is then possible to determine the stellar rotation period at
the given latitude of the starspot. It is also possible to measure the
sky-projected stellar obliquity of the system which can then begin to
shed some light on the primary mechanism of the dynamical evolution of
the system.
Κατηγορία
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- Τυπική άδεια YouTube
ANΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 21/3/2015
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