exoplanets & naked-eye stars
DESCRIPTION
Exoplanets & Naked-eye Stars. Objects in a System Orbit the Center of Mass. So Stars Wobble…. Beta Geminorum (Pollux) Radial Velocity. Beta Geminorum b (HD62509). Pollux b has been calculated to have a minimum mass of 2.3 Jupiters - PowerPoint PPT PresentationTRANSCRIPT
Objects in a System Orbit the Center of MassSo Stars Wobble…
Beta Geminorum (Pollux) Radial Velocity
Beta Geminorum b (HD62509)
• Pollux b has been calculated to have a minimum mass of 2.3 Jupiters
• The planet orbits Pollux at an average distance of 1.64 au.
• The planet is located in an equivalent position of between Earth and Mars in our solar system.
Winter 2009-2010
GAAC 2/12/2010
The Gamma Leonis system
Companion(in order
from star)Mass
Semimajor axis(AU)
Orbital period
(days)
Eccentricity
b ≥8.78 MJ 1.19 429 0.14
c (unconfirmed) ≥2.14 MJ 2.6 1340 0.13
Gamma 1 Leonis
Even though Gamma Leonis 1b is approximately 1au from its star, it is well outside the system’s habitable zone (hot Jupiter)
Epsilon Tauri
The Epsilon Tauri system[3]
Companion(in order from star)
Mass Semimajor Axis(AU)
Orbital period(days)
Eccentricity
b >7.6 (± 0.2) MJ 1.93 (± 0.03) 594.9 (± 5.3) 0.151 (± 0.023)
Epsilon Tauri b
Epsilon Tauri b orbits within its star’s habitable zone
Winter 2009-2010
GAAC 2/12/2010
11 Umi
Gas giant; eccentric orbit; habitable zone
Gamma Cephei Accretion Disk
The Inner Edge of Habitability Zone is 1.69 AU & the Outer Edge of Habitability Zone is 5.27AU.
Among the hottest of the hot jupiters
Two planets so far, both outside the habitable zone
(4067)
Winter 2009-2010
GAAC 2/12/2010
The 51 Pegasi system
• orbital period = 4.2 days
• observed orbital amplitude = 53 +/- 2.5 m/s
• semi-major axis = 0.05 au
• probable mass = 0.5 Jupiter Masses
Winter 2009-2010
GAAC 2/12/2010
Winter 2009-2010
GAAC 2/12/2010
Winter 2009-2010
GAAC 2/12/2010
Winter 2009-2010
GAAC 2/12/2010
Direct Observation of Exoplanet System HR8799
(Infrared)
Winter 2009-2010
GAAC 2/12/2010
Iota Draconis
7000
6503
6543
69396946
7142
Draco
20h 19h 18h 17h
+65°
+60°
+55°
+50°
NE
3 4 5 6 7
Galaxy Open Cl Planetary
42 Draconis
Exoplanet Search
• Beyond our Solar System
• Total exoplanets 430
• Stars with planets 362
• Gas Giants 270
• Hot Jupiters 89
• Pulsar Planets 4
• Earthlike Planets 0
Exoplanet Discovery, 1989-2010
Winter 2009-2010
GAAC 2/12/2010