July 17:

ABSTRACT:

Replaced the first two sentences in the abstract:

"We have attempted to image planets around nearby stars
 at the $L'$ and $M$ band using the Clio camera with the
 deformable secondary mirror adaptive optics (AO) system
 on the MMT.  This wavelength regime, at which the MMTAO
 system offers uniquely low background, has not been well
 utilized in searches for extrasolar plnaets, but offers some
 advantages over the more commonly used wavelengths in the
 much shorter $H$ band regime."

With 3 sentences intended to be clearer and not so breathless:

"We have attempted adaptive optics (AO) imaging of planets
 around nearby stars in the $L'$ and $M$ bands, using the Clio
 instrument on the MMT. The MMTAO system, because of its
 deformable secondary mirror, offers uniquely low background 
 AO-corrected images in these bands. This has allowed us to 
 explore a wavelength regime that has not been well utilized 
 in searches for extrasolar planets, but offers some advantages 
 over the more commonly used wavelengths in the much shorter 
 $H$ band regime."

Made the description of the $\epsilon$ Eri and Vega observations
a second paragraph.

Broke up two long sentences in the paragraph about the
larger survey.  Removed 'sun-like' from the description
of our target stars, as some of them were M-stars and
this will be discussed in detail later.

Added the following as a final paragraph 
to explain the future importance of the L' and M bands:

"We have helped develop $L'$ and $M$ band AO astronomy.  
 These wavelengths will become increasingly important with the 
 advent of new giant telescopes sensitive to very interesting,
 low-temperature planets with extremely red $H-L'$ and $H-M$ colors."


INTRODUCTION:

Replaced "modern explosion of extrasolar planet science"
with "current explosion of extrasolar planet science" in
the second paragraph.

Changed "51 Peg B" to "The planet 51 Peg B" at the start of
the third paragraph.

Removed irrelevant 'thus' from the sentence
"The methods are thus complementary in principle." at the end
of paragraph 7.

Changed the beginning of paragraph 9 from 
"Even for the most promising systems, planet imaging observations
are extremely technically challenging..."
To
"Planet imaging observations of even the most promising star
systems are extremely technically challenging..."

Added references for the paragraph 9 sentence:
"As of this writing there has been no unambiguous 
 imaging detection of a planet orbiting an ordinary, 
 solar-type star, though objects straddling the planet/brown
 dwarf boundary or orbiting very low mass primaries  have 
 been imaged."

Added references for the first senstence of paragraph 10:
"Several planet-imaging surveys have been carried out in 
 the near-IR $H$ band and related wavelengths."
Also changed "Several" to "Many" in this sentence.

Changed "because the sensitivity extends"
to "because for such stars the sensitivity extends"
in the last sentence of paragraph 12.

Added reference for the astrometric detection of
Eps Eri B in paragraph 15.

In paragraph 16, changed
"We also present the specific sensitivity acquired around each star, 
 as well as lists of possible sources..."
to
"We also discuss in detail the specific sensitivity acquired around 
each star, and present lists of possible sources..."

In paragraph 18, changed 
"They may guide future observers in processing techniques to 
get the best possible point-source sensitivity from the typically 
ugly images that come from L' and M band detectors."
to
"They may help future observers obtain the best possible 
point-source sensitivity from the typically ugly images 
that come from L' and M band detectors."



CHAPTER 2 (VEGA AND EPS ERI)

Added the sentence "The grid squares are 2x2 arcsec." to
the contour image captions.

Added references for the short Poyting-Robertson/Radiative Blowout
lifetimes of dust in Vega-like debris disk systems.




Chapter 3 (SURVEY):

Subsection: One Caveat to Our Sensitivity Estimates

Changed 

"There is one effect of potential significance that we have negelected
in computing our formal 10$\sigma$ sensitivity maps, and that is the
degree to which some of the steps in our processing pipeline may
dim real point sources."

in paragraph 1 to

"There is one effect of potential significance that we have negelected
in computing our formal 10$\sigma$ sensitivity maps: the
degree to which some of the steps in our processing pipeline may
dim real point sources."


Changed the second sentence of paragraph 5 from

"First, to prove that the hot pixel fixing really had as
negligible an effect as we supposed, we input into 1000
simulated images a serious of faint point sources using the
PSF of the star GJ5, which was observed in above-average seeing
and is one of the sharper PSF's we measured."

to

"First, we constructed 1000 simulated images, ran them
through various parts of our processing, and stacked them
to get final images on which the flux loss from point sources
could be measured.  The images were made by creating a
background of pure gaussian noise and then adding in
bright and faint point sources based on a real stellar
PSF from our science data.  Stacked but unprocessed
versions of these images are shown in Figure \ref{fig:creepmed},
where they serve to illustrate the performance of
creeping mean and median combines.  To prove that the
hot pixel fixing really had as negligible an effect
as we supposed, we used the PSF of the star GJ 5
for the inserted point sources.  This star was observed
in above-average seeing and is one of the sharper
PSFs we measured."

Changed Table tab_floss01.tex (Table 3.14) so that the
flux loss numbers come at the end of the text description
of the processing, rather than in the middle.