Sarah, Ellie, Adan and Sruthy The Transit Method The main disadvantage of the transit method is that for us to detect a planet, the orbit must be precisely aligned with our point of view. Our Project TrES-3b Jupiter compared to TrES-3b Mass1.1990.052 M J Orbital Period d Radius1.341 R J Surface gravity3.2840.016 g Temperature- Distance75030 ly TypeGas Giant Star GSC ConstellationDraco Duration of transit 0.042days Dip in brightness0.025 Ratio of planet to star radius 0.16 Theory Radius, mass of star, as well as planets period, estimated through observation Then you can calculate: 1)semi-major axis 2) orbital speed 3) radius 4)transit duration 5) impact parameter 6)Inclination Calculations based on Newton & Keplers Laws. GJ-1214 b Mass6.55 0.98 M Orbital Period 1.6x10 -7 d Radius2.678 0.13 R Surface gravity 0.91 g Temperature 393555 K Distance 42 ly (12 pc) TypeSuper-Earth StarGJ 1214 ConstellationOphiuchus Duration of transit days Dip in brightness Ratio of planet to star radius 0.12 Qatar-1b. Mass1.090.08 M J Orbital Period 1.6x days Radius1.164 0.06 R Surface gravity- Temperature138045 K Distance550 ly (169 pc) TypeGas Giant StarQatar-1 ConstellationDraco Duration of transit days Dip in brightness0.025 Ratio of planet to star radius 0.16 WASP-2bSP-2b Jupiter compared to WASP-2b Mass0.847 M J Orbital Period 4x10 -7 days Radius1.079 R J Surface gravity3.279 g Temperature1300 54 K Distance470 ly (144 pc) TypeGas Giant StarWASP-2 ConstellationDelphinus Duration of transit days Dip in brightness0.019 Ratio of planet to star radius 0.14 Detecting Exoplanets Using Radial Velocity or the Doppler Method What is radial velocity? Velocity along the line of sight toward or away from the observer. This diagram shows how an orbiting planet will change the position of the star it orbits due to its gravitational tug. What is spectroscopic radial velocity and how can it be used to determine a planets radial velocity? S.R.V is the radial component of the velocity of the source at emission and the observer at observation, as determined by spectroscopy. Advantages and Disadvantages of using the radial velocity method. Advantage: The planet's eccentricity can be measured directly. Disadvantage: Can only estimate a planets minimum mass. Easier to detect planets orbiting low mass stars because.... More affected by the planets gravitational tug. Generally, the planets rotate more slowly when orbiting a low mass star. R.V. Method is the most productive method used Exoplanets 31 confirmed and 323 candidates. Of the 31 confirmed Exoplanets 1 Exoplanet has been identified as having the potential for habitability Gliese 581-d