ALMA North American Science Advisory
Phone Meeting 2005-January-07
- Call date: 2004-January-07 (Friday)
- Call time 14:00 EST or 19:00
- Duration: 1 hr
- USA Number: 877-874-1919
- Outside USA Number: +1 203-320-9891
- Passcode: 185064
- Leader: Al Wootten
Old Business --
of 4 November 2004 meeting. Notes
from that meeting.
New Business -- Agenda
1. ALMA Project News (van den Bout)
ALMA Report. See ALMA Science IPT
wiki created for collaborative discussions. See below for
2. ASAC (Turner) --
for meeting 2005 Jan 4
ALMA at the IAU
3. Discussion topics-- (Yun)
Survey--Status of Letter to Director of
AAS Meeting Agenda
4. Any Other Matters
Science Corner: Sebastian Wolf writes: The new
simulation was done for an observing wavelength of * 870mu *,
instead of 330mu.
These simulations show that the locally heated region around
the (proto)planet is not visible anymore, even if the system
is in a distance of only 50pc. The assumed system
temperature is 220K (compared to 1200K at 900GHz - based on ALMA Memo
All other parameters (phase noise, pointing error/model, etc.)
are the same as in Wolf & D'Angelo (2005;
The main reason for the negative result is the fact that the
hot region around the planet has a small diameter only.
Increasing the beam size, this signal is smoothed with the almost
zero signal of the low-density gap and cannot be distinuished
anymore from the bright region of the disk outside the gap.
That's at least my understanding of the situation (which I found
to be true in all other simulations I performed).
Fig. 2.— Simulation of ALMA observations of disk with an
embedded planet of 1Mjup around a 0.5M⊙ star
(orbital radius: 5AU).
The assumed distance is 50 pc or 100 pc as labeled. The disk
mass is set to that of the Butterfly Star in Taurus. Note
shape of the spiral wave near the planet and the slightly shadowed
region behind the planet
in the upper images.
and/or ALMA wiki
for background information on some discussed items.
Al Wootten has also created an ANASAC wiki page at NRAO for this
collaborative effort. You can find the link as https://wikio.nrao.edu/bin/view/ALMA/AlmaNorthAmericanScienceAdvisoryCommittee.
You will find my earlier e-mail and the web link to the sample survey
questions if you click on "NaascSurvey" wiki word on the front page.
you are just browsing, you need not do much else. If you want to
contribute material to these wiki pages, you can visit https://wikio.nrao.edu/bin/view/TWiki/WelcomeGuest
to learn more about this web tool and register using the link shown at
Several points regarding use of the wiki:
Any registered user may put text on a wiki page or construct a new one.
Please let Wootten know if you have questions about this process.
When you edit a page you lock it. ¨
A file lock will time out and release after one hour of inactivity.
A file lock can be overridden (please do not do this). ¨
The wiki has lots of plugins (like one which allows for an interactive
group action item list) which will be installed over the coming weeks.
Upcoming Meetings - Wootten
Universe 27-29 October 2004, Paris NEW! Presentations
IAU Symposium 227
Massive Star Birth: A Crossroads of Astrophysics May 16-20 2005,
the Universe: Recent Successes and Current Challenges 2005 August
September 2; Asilomar, California
Planets V 24 - 28 October 2005 Hilton Waikoloa Village,
Big Island, Hawaii