Geoscience Reference
In-Depth Information
Chapter 11
Photometric and Spectroscopic Observations
of Exoplanet Transit Events
Liyun Zhang and Qingfeng Pi
Abstract
Firstly, we review simply the exoplanet transit events and introduce our
ongoing optical wavelength project. Then, we present new photometric observations
of the transiting planets (HAT-P-10b/WASP-11b, HAT-P-19b, WASP-43b, :::)
using an 85-cm telescope of Xinglong Station of the National Astronomical Obser-
vatories of China in 2012. New transit curves are modeled using the JKTEBOP
code and adopting the quadratic limb-darkening law. The preliminary parameters
(the orbital inclination, relative radius ::::::) of these star-planet systems are
re-obtained. We also revise the ephemeris with a transit epoch and discuss a period
change by the observed minimum minus calculated transit times. Finally, our future
plans in China are given and discussed.
Keywords
Extrasolar planet Photometry
Spectroscopy Transit timing
variation
11.1
Introduction
Astronomers have discovered 973 extrasolar planets up to 10 November 2013
by ground and space survey (catalogue from
http://www.openexoplanetcatalogue.
transits of extrasolar planets across the stellar disk cause dips of at most a few
percent in the photometric light curves of their parent stars (see Fig.
11.1
). It is
a very promising method to detect and characterize extrasolar planets. The transit
of exoplanet can provide information about transit time, duration, relative radii and
orbital inclination which can be used to derive its mass and density. Study of transit
timing variation (Diaz et al.
2008
; Sozzetti et al.
2009
) is very important because it
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