Apodization in high-contrast long-slit spectroscopy - II. Concept validation and first on-sky results with VLT/SPHERE

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Volume 586 (February 2016)

A&A, 586 (2016) A144

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Table 1

Data acquisition log.

Light source	Neutral density	Apodizer	Coronagraph	Lyot stop	Filter	T_exp	Comment
						(min)

Imaging and saturated imaging data

Point source	3.5	No	No	No	H2	3.0	Reference PSF
Point source	1.0	No	No	No	H2	3.0	Saturated PSF
Point source	...	No	No	No	H2	3.0	Background

Point source	3.5	SLLC	No	No	H2	8.0	Reference SLLC PSF
Point source	1.0	SLLC	No	No	H2	8.0	Saturated SLLC PSF
Point source	1.0	SLLC	CLC	No	H2	8.0	SLLC + FPM
Point source	...	SLLC	No	No	H2	8.0	Background

Flat field	...	No	No	No	H2	...	Flat field

Long-slit spectroscopy data

Point source	No	No	Slit^a	Prism^b	YJHKs	11.0	Coronagraphic data
No	...	No	Slit^a	Prism^b	YJHKs	11.0	Background
Point source	3.5	No	Slit^a	Prism^b	YJHKs	4.0	Reference (off-axis) PSF
No	...	No	Slit^a	Prism^b	YJHKs	4.0	Background

Point source	No	SLLC	Slit^a	Prism^b	YJHKs	12.0	Coronagraphic SLLC data
No	...	SLLC	Slit^a	Prism^b	YJHKs	12.0	Background
Point source	3.5	SLLC	Slit^a	Prism^b	YJHKs	8.0	Reference SLLC PSF
No	...	SLLC	Slit^a	Prism^b	YJHKs	8.0	Background

Flat field	...	No	No	No	YJHKs	...	Flat field
Laser lines	...	No	Slit^a	Prism^b	YJHKs	...	Wavelength calibration

ZELDA measurements

Point source	No	No	ZELDA	No	Fe ii	0.5	ZELDA measurement
Point source	No	No	No	No	Fe ii	0.5	Reference clear pupil
No	...	No	No	No	Fe ii	0.5	Background

Notes.

^(a)

The slit has a width of 0.12′′ on sky and includes a central focal plane mask of radius 0.20′′.

^(b)

The dispersive element in IRDIS is located immediately behind the Lyot stop plane. It includes a circular Lyot stop with a size of 92% of the pupil diameter.

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