OGLE-TR-56 System

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Exoplanetary Scratchpad

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Contains first planet discovered by transit and later confirmed by Dopplar Spectroscopy (rather than the other way around). The first OGLE planet confirmed with the Dopplar method. It is 6000 ly away, 10 times as far as any previous known planet, in a different arm of the galaxy. Also the first Very Hot Jupiter discovered. It may meet its doom in less than a million years. Planet has one of the first two ground-detected atmospheres. Has an atmosphere hotter than any other measured so far. Unlike other hot Jupiters observed, it is way too hot for clouds of silicon or iron to form which would keep it dark.

OGLE-TR-56 System Web Pages

OGLE-TR-56 System In the News

Transit Detected (2002)

Most Distant Planet Discovered (2003)

Hi Res Spectrometry Follow Up (2003)

Germans Confirm 2nd Very Hot Jupiter (Wrong?) (2003)

Two New Very Hot Jupiters Discovered (2003)

Updated Radius Measurements (2007)

Study on Tidal Interactions Between Star and Planet (2007)

First Exo-Planetary Atmosphere Detected From Earth (Jan 09)

Mentioned in Another Report, May Meet Doom in 1MY (Oct 10)



  • First planet found outside of Orion Arm
  • First planet discovered first with transit method and later confirmed with Doppler Spectrometry
  • First OGLE candidate confirmed with Doppler Spectrometry
  • First transiting Very Hot Jupiter discovered
  • First exoplanet to have its infrared light detected from Earth

Not Firsts:

  • Second transiting exoplanet confirmed


  • Furthest known exoplanet at time of discovery (other OGLE candidates are about the same distance)
  • Planet closest to its star (until WASP-12 b in 2008)
  • Hottest measured exoplanet (1,900 K) even in 2009


  • November 3 2002 - Discovered via transit
  • January 4 2003 - Confirmed using Doppler Spectrometry
  • April 3 2003 - OGLE-TR-3b said to be third detected transiter and even closer verified with dopplar spectrometry by German scientists, but not confirmed.
  • 2004 - Planets in OGLE-TR-113 System and OGLE-TR-132 System confirmed, clinching case for class of Very Hot Jupiters
  • 2007 - Radius refined to 1.30 RJ (was estimated at 1.3, considered "inflated")
  • 2008 - Becomes first planet whose optical spectrum is resolved from the ground
  • Apr 1 2008 - Planet in WASP-12 System discovered, overtaking it for closest in planet known


  • Mass: 1.29 MJ
  • Radius: 1.3 RJ
  • Density: 779 kg/m3
  • Surface gravity: 19.8 m/s² (2.02 g)
  • Temperature: ~1973 K / 2700 K
  • Distance from Star: 0.0225 AU
  • Period: 1.2 day
  • Eccentricity: 0


  • Too hot for Silicate clouds that would keep it dark
  • Hot enough for Iron clouds to form and to rain Iron (like some Brown Dwarves do)
  • Has little winds
  • Has a thermal inversion layer (hot layer over a cool layer)
  • Hot enough to emit optical light as well as near infrared (which was detected in space and on ground)
  • Star itself is very hot
  • Day side is extremely hot (2700 K), too hot for even Iron clouds to form
  • Hot day side makes it impossible for winds to distribute heat to the night side, thus, the night side is colder and there are few winds.


  • Vs HD 209458 System - As the first detected Very Hot Jupiter, this planet is twice as close to its star (0.0225 AU vs. 0.045 AU), has about a third of its period (1.2 day vs 3.5 day), and significantly hotter (1973 K vs 1130 K). It is twice as massive (1.29 MJ vs 0.63 MJ), but has about the same radius (1.3 RJ, still considered "inflated", not sure if its "over-inflated"), and thus twice as dense (779 vs 370 kg/m3) and has twice the surface gravity (2.02 vs. 0.96 g).

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