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We have discovered planets in Beta_Pictoris(A6V)here and Fomalhaut alpha(A3v)here.
However they were discovered by direct images.

There should be an stellar type limit by RV?
What is the most early type ever found?

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What do you mean by "direct images"? Eclipses? And what do you mean by "most early type ever found"? If we observed O0 stars? –  Py-ser May 15 at 5:59
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direct image means we see the planet directly. You can see two images at those two links above. early type, I mean ,stellar classification. It is not easy to find early type star host by a exo-planet via radial velocity. –  questionhang May 15 at 8:07
    
'What is the most early type ever found" is too general. Please, edit the question. Also about the first point, you should say something like "they were directly observable". –  Py-ser May 15 at 8:17
    
It is not "too general". We have only found no more than 2k EXOPLANETS. –  questionhang May 15 at 13:00
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direct imaging is one of the methods of discovering exoplanets. you can take a look at en.wikipedia.org/wiki/Methods_of_detecting_exoplanets –  questionhang May 15 at 14:42

1 Answer 1

HD 103774 b, detected by radial velocity, orbits a star of spectral type F5V according to The Extrasolar Planet Encyclopeadia.

HD 102956 b, detected by radial velocity, orbits a spectral type A subgiant, the star of the "earliest" type harboring a planet detected by radial velocity, I could find (as of May 2014).

The entry for Kepler-88 c around a spectral type B star (according to the catalog as of May 2014) appears to be incorrect, or encodes something else, the star should be classified as spectral type G6V.

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About Kepler-88, also the star is 1 solar mass. –  Py-ser May 16 at 0:46
    
sigh, the discovery paper(Johnson et al, 2010) of HD102956B did not mention any spectral thing. There is no spectrum or spectral line at all. –  questionhang May 18 at 8:40

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