HR8799

General comments

The tri-planet has been observed on 3 nights: 20110612, 20110613, 20110615. A preliminary analysis suggests however the possibility that data collected on 20110613 are not usable (due to possible low accuracy of the telescope pointing, to be verified with a further analysis). The very last acquisition 20110615_113906 is done with ADI and consists of 30 exposure of 10s.

!! all J images (20110613) show a bright source on the right of the main star in the field. This has been labeled as "ghost", likely due to internal reflections or similar. Averaging several images, a third, much fainter, reflection becomes visible, then enforcing the idea of the ghost.

A round object is noticeable on datasets 20110612 and 20110615, located 85 pix far from the star center, pos angle=60° (just below the main diffraction arm). Such distance is approx 1.7arcsec and is compatible to HR8799b as discussed in the literature. Drawing a circle of a radius matching that of HR8799d, we realized that the d planet cannot be identified as that portion of the image is saturated (no scatter in counts, ADU level flat at 32000: is this the effect of the CDS as discussed in the general comment page?). Possibly, a shorter exposure time (and wider sampling) could help: also, HR8799d should be much brighter than the b companion.

The same stands for HR8799c. It should be found at the edge of the saturated area, hence in a maybe more easy position...

The 20110615_113906 dataset has been processed considering the ADI data reduction. However, the field rotated by 2° only.

* Planets (from Marois & al, Nature 08 December 2010):

Raw data

12 June

TrackNo	RA/DEC	filter	exp	#frames	El	DIMM/OL	Mag	bin	#mod	freq	notes
20110612_114322	23:07:27 21:08:35	Ks	10000	6	68	NaN 0.66	7.3	1	400	990
20110612_114544	23:07:27 21:08:35	Ks	10000	6	69	NaN 0.51	7.3	1	400	990

13 June

TrackNo	RA/DEC	filter	exp	#frames	El	DIMM/OL	Mag	bin	#mod	freq	notes
20110613_113125	23:07:26 21:08:38	Ks	5000	2	67	1.58 1.19	7.4	1	400	990
20110613_113255	23:07:26 21:08:38	Ks	5000	2	67	1.55 0.87	7.3	1	400	990
20110613_113333	23:07:26 21:08:39	Ks	5000	2	67	1.35 1.04	7.4	1	400	990
20110613_113446	23:07:26 21:08:39	Ks	5000	2	68	1.36 1.39	7.5	1	400	990
20110613_113659	23:07:26 21:08:39	Ks	20000	2	68	1.45 0.99	7.4	1	400	990
20110613_113903	23:07:26 21:08:39	Ks	20000	2	68	1.17 0.74	7.3	1	400	990
20110613_114043	23:07:26 21:08:40	J	2000	2	69	1.20 0.78	7.3	1	400	990
20110613_114116	23:07:26 21:08:40	J	2000	2	69	1.23 1.14	7.4	1	400	990
20110613_114220	23:07:26 21:08:40	J	2000	2	69	1.70 1.22	7.4	1	400	990
20110613_114253	23:07:26 21:08:40	J	2000	2	69	1.71 1.20	7.4	1	400	990
20110613_114434	23:07:26 21:08:40	J	2000	2	69	1.38 0.84	7.3	1	400	990	Pos angle changed
20110613_114511	23:07:26 21:08:40	J	2000	2	69	1.27 0.78	7.3	1	400	990
20110613_114632	23:07:26 21:08:41	J	2000	2	70	1.21 0.69	7.3	1	400	990	Pos angle changed
20110613_114705	23:07:26 21:08:41	J	2000	2	70	1.18 0.71	7.3	1	400	990
20110613_114730	23:07:26 21:08:41	J	2000	2	70	1.09 0.72	7.3	1	400	990
20110613_114851	23:07:26 21:08:41	J	2000	2	70	1.03 0.65	7.3	1	400	990	Pos angle changed
20110613_114935	23:07:26 21:08:41	J	2000	2	70	1.15 0.81	7.3	1	400	990

15 June

TrackNo	RA/DEC	filter	exp	#frames	El	DIMM/OL	Mag	bin	#mod	freq	notes
20110615_113049	23:07:28 21:08:03	H	1000	1	68	1.09 0.62	7.4	1	400	990
20110615_113159	23:07:28 21:08:03	H	2000	1	68	1.07 0.50	7.3	1	400	990	Bad - low AO gain
20110615_113301	23:07:28 21:08:03	H	2000	1	69	1.16 0.78	7.4	1	400	990
20110615_113426	23:07:28 21:08:03	H	10000	1	69	1.50 0.63	7.4	1	400	990
20110615_113801	23:07:28 21:08:02	H	10000	1	70	NaN 0.58	7.4	1	400	990
20110615_113906	23:07:28 21:08:02	H	10000	30	70	NaN 0.66	7.4	1	400	990	ADI - Rotator stopped

Dark images

20110615_120453_pisces.cq.fits: 30x10s sky images in H band. Good for 20110615_113906 (... not so much: as it is a Sky frame, the # of counts is very large as the twilight is arriving..)