The MOA Project 2013 Observing Season

David BennettUniversity of Notre Dame

MOA-II 1.8m telescope（ New Zealand/Mt. John Observatory at NZ, 44S ）

Mirror : 1.8mCCD : 8k 　 x 　 10k pix.

FOV : 2.2 deg.2

- Allows high cadence monitoring

MOA Observing Strategy

• 50 deg.2(20Mstars)• 2.2 deg.2 per field

1obs./night.(>MJup)

• 1obs./95min.(Mjup)

1obs./47min. (Mnep)

1obs./15min. (M)668 microlensing events (2013)

https://it019909.massey.ac.nz/moa/

G.C.

Real time photometry and alerts

MOA-2009-BLG-266

parallax uncertainty is asymmetric

Summary of Planetary Results

• 10 events with planetary signals in MOA data– MOA-2013-BLG-040/OGLE-2013-BLG-0077*– MOA-2013-BLG-093*– MOA-2013-BLG-220– MOA-2013-BLG-605/OGLE-2013-BLG-1835– OGLE-2013-BLG-0132/MOA-2013-BLG-148*– OGLE-2013-BLG-0341/MOA-2013-BLG-26– OGLE-2013-BLG-1125/MOA-2013-BLG-584– OGLE-2013-BLG-1271/MOA-2013-BLG-579*– OGLE-2013-BLG-1721/MOA-2013-BLG-618 – OGLE-2013-BLG-1761/MOA-2013-BLG-651

• Many anomalies not detected in real time (*)– Plan to fix this in 2014

MOA-2013-BLG-040/OGLE-0077

MOA+OGLE survey discovery - Not alerted in real time

q = 3×10-4 t* poorly constrained

MOA-2013-BLG-093

MOA+OGLE survey discovery - No real-time alert q = 3×10-3

MOA-2013-BLG-220

High mag event, alerted by MOA, covered by uFUN, Robonet, MOA and OGLE q = 3×10-3

MOA-2013-BLG-605/OGLE-1835

Planetary anomaly alerted as single lens event in real time – understood as planetary event when it began brightening again.

q = 3×10-4 s = 2.3 likely parallax signal

OGLE-2013-BLG-0132/MOA-148

1st planetary peak missed by MOA real-time analysis. Identified by Han with OGLE data from the next night, but not follow-up data obtained

q = 5×10-4 s = 1.14 likely parallax signal

OGLE-2013-BLG-0341/MOA-260

Identified by Gould & Han as likely planetary event before high-mag – binary star system with planet.

Gould et al. paper in preparation

planet has low mass 2-3 Earth-masses.

OGLE-2013-BLG-1125/MOA-584

Alerted in real time by MOA, but toward the end of the planetary anomaly. But, peak observed by Robonet, μFUN.

q = 2×10-3 s = 1.05 strong parallax

OGLE-2013-BLG-1271/MOA-579

MOA+OGLE survey discovery.

Not identified in real time

Strong cusp crossing in MOA data

q = 4×10-3 s = 1.45

OGLE-2013-BLG-1721/MOA-618

Planetary signal in OGLE data identified by Han

“Manual alert” used to produce MOA light curve

q = 1.3 ×10-3 s = 0.96

OGLE-2013-BLG-1761/MOA-651

Anomaly identified in real time by MOA, but no follow-up data.

(Late in season – Sep. 10)

q = 3×10-3 s = 0.88 or

q = 6×10-3 s = 0.96

High Magnification Alerts

• 26 high mag alerts based in part on MOA data– MOA-2013-BLG-063 – MOA-2013-BLG-126– MOA-2013-BLG-145/146– MOA-2013-BLG-220– MOA-2013-BLG-246– OGLE-2013-BLG-0341/MOA-2013-BLG-260– MOA-2013-BLG-067– MOA-2013-BLG-299/OGLE-2013-BLG-0640 – OGLE-2013-BLG-0674/MOA-2013-BLG-346– OGLE-2013-BLG-0488/MOA-2013-BLG-355– OGLE-2013-BLG-0446/MOA-2013-BLG-306– OGLE-2013-BLG-0860/MOA-2013-BLG-411– OGLE-2013-BLG-0798/MOA-2013-BLG-432– MOA-2013-BLG-456

– MOA-2013-BLG-460– OGLE-2013-BLG-1066/MOA-2013-BLG-471– OGLE-2013-BLG-1114/MOA-2013-BLG-485– MOA-2013-BLG-498– OGLE-2013-BLG-1177/MOA-2013-BLG-505– MOA-2013-BLG-524– MOA-2013-BLG-557– OGLE-2013-BLG-1259/MOA-2013-BLG-528– OGLE-2013-BLG-0911/MOA-2013-BLG-551– MOA-2013-BLG-611– MOA-2013-BLG-650– OGLE-2013-BLG-1868/MOA-2013-BLG-655

Likely planetary events in red (not all events checked)

MOA real-time photometry means that most high mag alerts have most recent data from MOA

7 other high mag alerts with OGLE data only(according to my possibly incomplete email review)

High Mag Alerts

MOA-2013-BLG-063 MOA-2013-BLG-220 planet!

High Mag Alerts

OGLE-2013-BLG-0341 (planet) MOA-2013-BLG-299/OGLE-0640

High Mag Alerts

OGLE-2013-BLG-0674/MOA-346 OGLE-2013-BLG-0446/MOA-306 planet

High Mag Alerts

OGLE-2013-BLG-0860/MOA-411

High Mag Alerts

OGLE-2013-BLG-0798/MOA-432 MOA-2013-BLG-460

High Mag Alerts

OGLE-2013-BLG-1066/MOA-471 OGLE-2013-BLG-1114/MOA-485

High Mag Alerts

MOA-2013-BLG-498 MOA-2013-BLG-557

High Mag Alerts

OGLE-2013-BLG-1259/MOA-528 OGLE-2013-BLG-0911/MOA-511

possible planet

High Mag Alerts

MOA-2013-BLG-611 OGLE-2013-BLG-1868/MOA-655

Improvements Planned for 2014

• Problems:– missed planetary anomaly alerts– likely missed short, “rogue planet” events

• Develop remote anomaly alert capability• Reduce false alarms in real-time event alert system

– many false alarms are due to image artifacts that can be removed

• Closer cooperation with LCOGT? – particularly SAAO site which can immediately follow possible anomalies seen by MOA

• Arrange for planetary signals and good weather in the middle of the season when it is easier to collect data