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2016A Day 8: Surprise !

Look only 10 little Communication errors all night long!

Tonight went really well we only had 6 communication errors on start-up of the ASM (whereas we often have thousands but most don’t bother us) — so the ASM is enjoying this warm weather we are having. As you can see for the photos below we had a surprise at the end of last night when the telescope’s instrument rotator got stuck with MagAO upside down. This was exciting for us since the Infrared camera Clio can’t be filled up if it is upside down. The telescope crew quickly fixed the problem after breakfast and Clio was filled with liquid nitrogen by 9AM. So all is good. Tonight the telescope rotator has been great.

The MagAO instrument scientist is concerned

We have had another great night of low winds and great seeing for almost the whole night. Tonight is my last night. I’ll be back in 2 weeks to help with the GMT Phase Cam experiment and to take down the system. Katie and Jared will continue to be the real heroes of MagAO –keeping the system/AO/Clio/VisAO all running perfectly as usual for our visiting astronomer friends.

So as the seeing gets worse I need to take my leave of running the AO system — and so today’s song:

2016A Day 7: The Hunt

We had a good night going. We think we’ve found a solution to the ASM electronics problem — one of us just has to get out of bed early and warm it up before dinner. That did the trick tonight, no problems since. But we’ve been stuck with a bum guider for the last 3 or 4 hours of the night. We need the guider to find the star, and occasionally to get the telescope in shape. Troubleshooting is in progress at dawn.

The observatory has been patrolled by several, up to 5 at a time, raptors since I’ve been here. This one was sitting on one of the GMTs new poles.

Hawk on a pole

We got a real treat yesterday morning: this hawk was hunting vizzies behind the telescope. Watch how it uses the wind, and listen to the viscachas whistle. They don’t seem too worried though.

This song should be played loudly:

2016A Day 6: Samoa Pyramids

Tonight we noticed that our pyramid pupils look like Samoa(R) Girl Scout (R) cookies that Laird brought on behalf of his daughter:

The high spatial frequencies on the pyramid pupils look like Samoa(R) cookies and made us hungry

We started the night with some ASM issues that prompted us to send up the bat-signal to our Italian colleagues:

What was tonight like? I spent a lot of time looking for bright HR stars near zenith, then skyped with Marco Xompero from Arcetri who gave us some ideas about our ASM issues.

Walking down the hill this morning, we saw fog in the valley and a hawk practicing hunting vizcachas:

Fog in the valley and sun over the ridge

Even if we don’t have specific song rules, yesterday’s song made me think of this one, which is amazing:

2016A Day 5: The Internet Is Back

The internet went down in the middle of the night last night, and just came back.

Two nights ago we used a high speed camera, an Andor iXON 897 EMCCD, to measure the vibrations of our system at 2500 Hz (that means we were taking images at 5000 Hz). The camera was mounted where Clio normally goes

Our super whamodyne >5000 Hz EMCCD camera, just before we unbolted it and put it away.

Then yesterday, Katie rousted the crew to finally install Clio.

Clio
A soaring hawk looking for dinner

MagAO helped identify the progenitor of SN 2016adj

It is rare for MagAO to carry out extragalactic observations because suitable natural guide stars are hard to find.

But this time we have got some luck. A week ago (February 8), a bright supernova, SN 2016adj, appeared in the active galaxy NGC 5128 (Centaurus A). Classified as Type IIb, its progenitor is believed to be a very massive star in a binary system, undergoing a significant mass loss before explosion. However, direct identification of the progenitor remains challenging, even though astronomers have been constantly detecting supernovae in imaging surveys.

Since SN 2016adj is only 4″ from a bright foreground star, it is an ideal target for our visible AO camera. Prompted by Prof. Nathan Smith, we used MagAO to observe the supernova on February 13, and successfully took ~2 hr deep exposures at 0.9 micron. Comparing the new MagAO image to archival HST and VLT data, we and our collaborators were able to identify a possible progenitor star. Notably, this is the 5th Type IIb progenitor identified in pre-explosion images over the past 20 years.

We used MagAO to identify the progenitor star in this pre-explosion image taken by the Hubble Space Telescope.
We used MagAO to identify the progenitor star in this pre-explosion image taken by the Hubble Space Telescope.

Yesterday we posted our results on the Astronomer’s Telegram. You can find the link here:
http://www.astronomerstelegram.org/?read=8693