The quadratic limb darkening law was used in study. It is a model that describes the variation in the intensity of a star's photosphere as a function of the viewing angle.
I(μ) is the intensity of the star at u = cos (theta), i.e., the cosine of the angular separation of a point with respect to the center of the star.
As per transit principle the relative change in the observed flux is proportional to the relative area of the blocking object with respect to the area of the star.
They converted the intensity to a cumulative distribution function.
The orbital phase angle is a phase value corresponding to the location of the planet in its orbit at a certain time. Ω is the orbital velocity and P refers to the orbital period,
the overlapped area was calculated using the Monte Carlo technique.
The asymmetric parameter q is calculated as,
r0 is the distance between the planet and the star, hf is the second fluid Love number. The second fluid Love number is a parameter that describes the rigidity of a body under the effect of gravity.
Scientists developed a numerical transit simulator which is designed to generate light curves for objects of any arbitrary shape transiting stars.
Source: https://iopscience.iop.org/article/10.3847/1538-3881/ad7d8d
0 comments:
Post a Comment