High-contrast imaging of the close environment of HD 142527 - VLT/NaCo adaptive optics thermal and angular differential imaging

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Table 2

Observing Log of HD 142527 in L′-band with and without the neutral density (ND), as well as for the reference star HD 181296.

Star	Date	UT-start/end	DIT	NDIT	Nexp	π-start/end^a	⟨ Airmass ⟩ ^b	^b	⟨ τ₀ ⟩ ^b
			(s)			(°)		(arcsec)	(ms)

HD 142527 (ND)	07/29/2011	23:49/23:52	0.2	80	10	–15.4/–12.9	1.05	0.76	1.6
HD 142527	07/29/2011	23:59/01:03	0.2	100	129	–7.9/36.5	1.05	0.55	2.1

HD 181296	07/29/2011	03:23/04:27	0.2	100	124	–5.5/23.3	1.15	1.34	0.9

Notes.

^(a)

The parallactic angle at the start and the end of observations.

^(b)

The airmass, the seeing , and the coherence time τ₀ are estimated in real time by the AO system and averaged here over the observing sequence.

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