2018A&A...610A..18N


Query : 2018A&A...610A..18N

2018A&A...610A..18N - Astronomy and Astrophysics, volume 610A, 18-18 (2018/2-1)

Calibration of the island effect: Experimental validation of closed-loop focal plane wavefront control on Subaru/SCExAO.

N'DIAYE M., MARTINACHE F., JOVANOVIC N., LOZI J., GUYON O., NORRIS B., CEAU A. and MARY D.

Abstract (from CDS):

Context. Island effect (IE) aberrations are induced by differential pistons, tips, and tilts between neighboring pupil segments on ground-based telescopes, which severely limit the observations of circumstellar environments on the recently deployed exoplanet imagers (e.g., VLT/SPHERE, Gemini/GPI, Subaru/SCExAO) during the best observing conditions. Caused by air temperature gradients at the level of the telescope spiders, these aberrations were recently diagnosed with success on VLT/SPHERE, but so far no complete calibration has been performed to overcome this issue.
Aims. We propose closed-loop focal plane wavefront control based on the asymmetric Fourier pupil wavefront sensor (APF-WFS) to calibrate these aberrations and improve the image quality of exoplanet high-contrast instruments in the presence of the IE.
Methods. Assuming the archetypal four-quadrant aperture geometry in 8m class telescopes, we describe these aberrations as a sum of the independent modes of piston, tip, and tilt that are distributed in each quadrant of the telescope pupil. We calibrate these modes with the APF-WFS before introducing our wavefront control for closed-loop operation. We perform numerical simulations and then experimental tests on a real system using Subaru/SCExAO to validate our control loop in the laboratory and on-sky.
Results. Closed-loop operation with the APF-WFS enables the compensation for the IE in simulations and in the laboratory for the small aberration regime. Based on a calibration in the near infrared, we observe an improvement of the image quality in the visible range on the SCExAO/VAMPIRES module with a relative increase in the image Strehl ratio of 37%.
Conclusions. Our first IE calibration paves the way for maximizing the science operations of the current exoplanet imagers. Such an approach and its results prove also very promising in light of the Extremely Large Telescopes (ELTs) and the presence of similar artifacts with their complex aperture geometry.

Abstract Copyright: © ESO, 2018

Journal keyword(s): instrumentation: high angular resolution - instrumentation: adaptive optics - techniques: high angular resolution - telescopes - methods: data analysis

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1827 0

Query : 2018A&A...610A..18N

Basic data :
* alf CMi -- Spectroscopic Binary
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (*,AG,...), PM* (2002A&A,Ci,...), X (1AXG,2E,...), ** (2001AJ,**,...), UV (2EUVE,EUVE,...), IR (AKARI,IRAS,...), SB* (2004A&A,SBC7,...), V* (CSV,NSV), Ro* (1996ApJ), Rad (1C)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
07 39 18.11950 +05 13 29.9552 (Optical) [ 18.05 10.08 90 ] A 2007A&A...474..653V
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
07 36 41.13706 +05 21 17.4119 [ 18.05 10.08 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
213.70224138 +13.01939682 [ 18.05 10.08 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-714.59 -1036.80 [2.06 1.15 0] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -15.908408 [0.062660] / z(spectroscopic) -0.000053 [0.000000] / cz -15.91 [0.06]
   (Opt) A 2019A&A...624A..19B
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
284.56 [1.26] A 2007A&A...474..653V
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
F5IV-V+DQZ C 2013yCat....1.2023S
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (8) :
U 0.82 [~] C 2002yCat.2237....0D
B 0.79 [~] C 2002yCat.2237....0D
V 0.37 [~] C 2002yCat.2237....0D
R -0.05 [~] C 2002yCat.2237....0D
I -0.28 [~] C 2002yCat.2237....0D
J -0.39 [~] C 2002yCat.2237....0D
H -0.56 [~] C 2002yCat.2237....0D
K -0.65 [~] C 2002yCat.2237....0D
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (77) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* alf CMi FAUST 1387 2MASS J07391805+0513298 SBC7 317
* 10 CMi FK5 291 N30 1726 SBC9 467
* alf CMi A GC 10277 NAME Procyon SKY# 14100
** SHB 1A GCRV 5099 NAME Procyon A SPOCS 352
AG+05 1072 GEN# +1.00061421 NLTT 18229 SV* ZI 646
AKARI-FIS-V1 J0739178+051322 GJ 280.0 NSV 3672 TD1 10647
ASCC 1030621 GJ 280 8pc 285.93A TIC 280310048
1AXG J073918+0514 GJ 280 A PLX 1805 TYC 187-2184-1
BD+05 1739 HD 61421 PMC 90-93 212 UBV 7352
1C 12.01 HIC 37279 PM 07367+0521 USNO-B1.0 0952-00146563
CCDM J07393+0514A HIP 37279 PPM 153068 USNO 825
Ci 20 432 HR 2943 RAFGL 1161 uvby98 100061421
CSI+05 1739 1 IDS 07341+0529 A 2RE J0739+051 WDS J07393+0514A
CSI+05 1739 5 IRAS 07366+0520 2RE J073918+051351 WEB 7381
CSV 100884 IRC +10170 RE J0739+051 Zkh 106
2E 1849 JP11 1576 RE J073917+051339 [HFE83] 530
2E 0736.6+0520 LFT 541 ROT 1234 [TSA98] J073919.85+051356.36
1ES 0736+05.3 LHS 233 RX J0739.3+0513
2EUVE J0739+05.2 LSPM J0739+0513 1RXS J073918.3+051332
EUVE J0739+05.2 LTT 12053 SAO 115756

References (1827 between 1850 and 2022) (Total 1827)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 32    V* : 1    ROT : 8    Fe_H : 108    PLX : 2    PM : 3    MK : 6   

   

Observing logs


herschel : 2    IUE : 67    XMM : 2   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : * alf CMi

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2022.09.26-01:16:12

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