Lupus-TR-3: still around.

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Lupus-TR-3: still around.

Post by Lazarus on 7th October 2008, 12:10 pm

Extrasolar Planets Enyclopaedia
07 Oct. 2008: High spatial resolution images show that it is in fact a multiple star and not a transiting planet(Sackett et al. 2008)
Apparently the reference is to a talk at IAU Symposium #253 "Transiting Planets".


Last edited by Lazarus on 13th October 2008, 2:21 pm; edited 1 time in total
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Re: Lupus-TR-3: still around.

Post by Sirius_Alpha on 7th October 2008, 6:05 pm

Wait...

With RV measurements to constrain the mass, and transit measurements to constrain the inclination, how could there have been any uncertainty? How could this star have been mistaken for a planet?

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Re: Lupus-TR-3: still around.

Post by Lazarus on 7th October 2008, 6:18 pm

The original paper did not rule out the blend scenario...
The RV signal is small and its detection significance rather low, which is not surprising given the faintness of Lupus-TR-3.
With current data, we cannot rule out the unlikely possibility that the nearby faint, red star E is a blended binary responsible for the transit, but this is testable with minimal amounts of planned high resolution imaging.
(In fact, using the systemic console on the RVs for this system gives me a reduced χ2 of 1.259 by just adjusting the default offset, before putting even a single planet in)
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Re: Lupus-TR-3: still around.

Post by Lazarus on 13th October 2008, 10:42 am

It's back in the "confirmed" list. Comment now reads
07 Oct. 2008: High spatial resolution images show that very close neighbour stars may affect the planet radius (Sackett et al. 2008)
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Re: Lupus-TR-3: still around.

Post by Sirius_Alpha on 13th October 2008, 1:20 pm

So Lupus-Tr-3 is a tight binary? Interesting if so.

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