Brightness variations of an extrasolar giant planet orbiting its central star
Abstract
Over the last seven years extrasolar giant planets (EGPs) were discovered near 65 stars (their visual magnitudes are typically 4m-8m). Almost all information on them was derived from precise measurements of radial velocities. The radius-mass ratio is known for the EGP orbiting the star HD 209458: R/M = 1.55/0.69(RJ/MJ) = 2.25(RJ/MJ). Based on this ratio, we estimated the magnitudes of the EGPs of 65 stars, they range from 25.1m to 12.8m. In 21 systems the flux from the planet makes up 0.003-0.047 percent of the flux from the central star, and therefore such systems can be detected in photometric observations. The planets orbiting x Boo, HD 121504, HD 217107, HD 187123, HD 209458, HD 83443, HD 75289, 51 Peg, and HD 46375 are most suitable objects for such observations.
- Publication:
-
Kinematics and Physics of Celestial Bodies
- Pub Date:
- October 2002
- Bibcode:
- 2002KPCB...18..294V
- Keywords:
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- Brightness variations;
- astronomical observations;
- extrasolar giant planet