IAU on confirmation of exoplanet detection

View previous topic View next topic Go down

IAU on confirmation of exoplanet detection

Post by Phill on 26th September 2009, 1:00 pm

What does the IAU exactly require for the confirmation of an exoplanet detection?
Three identical occultations or wobble periods?
I couldn't find the IAU weblink for such requirements
avatar
Phill
Meteor
Meteor

Number of posts : 23
Location : Coastline where Einstein lived in 1933...
Registration date : 2009-07-31

View user profile http://mars-literature.skynetblogs.be/

Back to top Go down

Re: IAU on confirmation of exoplanet detection

Post by Sirius_Alpha on 26th September 2009, 3:11 pm

The IAU doesn't confirm or unconfirm exoplanets. They're in charge more of determining names of bodies, craters, classifications of objects, etc.

From what I can tell, the planet is confirmed purely by peer-reviewed research, and similarly disproven by it.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: IAU on confirmation of exoplanet detection

Post by Phill on 26th September 2009, 3:22 pm

That's what I thought also, but I read somewhere that at least three identical occultations were needed to be sure planetary transits are observed rather than some other process mimicing an exoplanet.
Generally two observations give a clue, three to make sure

Wouldn't be surprised if there're some IAU requirements
avatar
Phill
Meteor
Meteor

Number of posts : 23
Location : Coastline where Einstein lived in 1933...
Registration date : 2009-07-31

View user profile http://mars-literature.skynetblogs.be/

Back to top Go down

Re: IAU on confirmation of exoplanet detection

Post by Sirius_Alpha on 26th September 2009, 5:48 pm

The need for multiple transits is indeed to make sure it's a planet. This is a rule followed by the discoverers to make sure that they don't have to make a retraction later.

So let's say you discover a transit. You wait patiently for another transit, and it comes four days later. Yippie! You found a planet. But then four days afterward, you don't get a transit. Then two days after you expect it, you get another transit. Continued observations reveal that you've found two transiting planets in the same system, and what you thought was the orbital period of a single planet turns out to be the time inbetween transits of the two planets. The time inbetween transits may change if your photometric precision is low enough that sun spots trick you into thinking you found a transit. Since sun spots move around, you'll get transits that occur with changing regularity. Thus multiple transits are needed to check for consistency.

First transit -> You discovered a transiting object.
Second transit -> You have a lower limit on its orbital period.
Third transit -> Pattern repeats, orbital period confirmed.

This isn't IAU rules, and the IAU has nothing to do with confirming or disproving exoplanets. They're not even rules, but rather guidelines that anyone would want to use to make sure that they don't have to retract something later.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: IAU on confirmation of exoplanet detection

Post by Lazarus on 26th September 2009, 6:25 pm

IAU really hasn't got much about exoplanets... the definition of "planet" they put out is specifically restricted to the solar system, they do not have anything to do with the naming convention, anything like that.

The IAU's Working Group on Extrasolar Planets disbanded in 2006... its webpage is here.
avatar
Lazarus
dG star
dG star

Number of posts : 2819
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: IAU on confirmation of exoplanet detection

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum