- Brightness of Sirius A causes too much 'noise' in the electronics.
- The use of filters affects the system as well and any light from the planets are also filtered.
- Focus is on a putative third star instead of possible planetary system.
- Looking for transits across the star which is not detectable due to 1. and also the the line of sight may not correspond to the star's protoplanetary disc formed millions of years ago and aligned not to the Earth's point of view.
- There is the possibility that the planets are in a polar orbit i.e. 90 degrees to our point of view, see ellipse fig.1.
- the white dwarf with its immense gravity would have in its lifetime destroyed any planets that would have formed in the system
- gravitational stability of the system indicates that planets are possible at certain locations see Devant(1), and figure 2.
- The use of gravitational microlensing is recommended.
- The launch in December 2013 of the Gaia spacecraft offers a good opportunity to look for the Einstein ring effect on Sirius.
- Gaia will study 1 billion stars and take readings on every star every six seconds. This will enable a large number of planets to be detected as the Einstein time will have been in effect for many stars.
|Companion||α CMa B|
|Period (P)||50.090 ± 0.055 yr|
|Semi-major axis (a)||7.50 ± 0.04"|
|Eccentricity (e)||0.5923 ± 0.0019|
|Inclination (i)||136.53 ± 0.43°|
|Longitude of the node (Ω)||44.57 ± 0.44°|
|Periastron epoch (T)||1894.130 ± 0.015|
of periastron (ω)
|147.27 ± 0.54°|
α CMa A
|Surface gravity (logg)||4.33cgs|
|Age||2–3 × 108years|
α CMa B
|Radius||0.0084 ± 3%R☉|
|Surface gravity (logg)||8.57cgs|
I predict that there are planets within this region based on the 90% probability given by Devant(1) for a massive brown dwarf to exist. And, drawing from Kepler's laws the period would be about 5 years around the primary.
- Is Sirius a triple star? D.Benest and JL Duvent. Astron.Astrophys. 299, 621-628(1995).
- Piercing the glare: A direct imaging search for planets in the Sirius system.C Thalman et al. Astrophysical Journal Letters, 732:L34, May 10, 2011.
- Detecting Earth-mass planets with gravitational microlensing. DP Bennett and Sun Hong Rhee. Astrophysical Journal 472:660-664, 1996 Dec 1st.
- Discovery of a Jupiter/Saturn analog using gravitational microlensing. Gaudi et al.
Science 319, 927 (2008).
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