Astronomy and Astrophysics, volume 485, 607-613 (2008/7-2)
Detecting transits from Earth-sized planets around Sun-like stars.
CARPANO S. and FRIDLUND M.
Abstract (from CDS):
Detecting regular dips in the light curve of a star is an easy way to detect the presence of an orbiting planet. CoRoT is a Franco-European mission launched at the end of 2006, and one of its main objectives is to detect planetary systems using the transit method. In this paper, we present a new method for transit detection and determine the smallest detected planetary radius, assuming a parent star like the Sun. We simulated light curves with Poisson noise and stellar variability, for which data from the VIRGO/PMO6 instrument on board SoHO were used. Transits were simulated using the Universal Transit Modeller software. Light curves were denoised by the mean of a low-pass and a high-pass filter. The detection of periodic transits works on light curves folded at several trial periods with the particularity that no rebinning is performed after the folding. The best fit was obtain when all transits are overlayed, i.e. when the data are folded at the right period.Assuming a single data set lasting 150d, transits from a planet with a radius down to 2R⊕ can be detected. The efficiency depends neither on the transit duration nor on the number of transits observed. Furthermore we simulated transits with periods close to 150d in data sets containing three observations of 150d, separated by regular gaps with the same length. Again, planets with a radius down to 2R⊕ can be detected.Within the given range of parameters, the detection efficiency depends slightly on the apparent magnitude of the star but neither on the transit duration nor the number of transits. Furthermore, multiple observations might represent a solution for the CoRoT mission for detecting small planets when the orbital period is much longer than the duration of a single observation.
stars: planetary systems - techniques: photometric - methods: data analysis - occultations
(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases
Other object types:
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
References (477 between 1850 and 2019) (Total 477)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
new references on this object
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description . The list of all annotations to SIMBAD objects can be found here .