J/MNRAS/503/2265 VISTA and Subaru/HSC obs. of Upper Scorpius (Lodieu+, 2021)
Exploring the planetary-mass population in the Upper Scorpius association
Lodieu N., Hambly N.C., Cross N.J.G.
<Mon. Not. R. Astron. Soc., 503, 2265-2279 (2021)>
=2021MNRAS.503.2265L 2021MNRAS.503.2265L
ADC_Keywords: Photometry, ugriz; Surveys; Associations, stellar;
Stars, brown dwarf
Keywords: techniques: photometric - techniques spectroscopic - surveys -
brown dwarfs - stars: luminosity function - mass function -
open clusters and associations: individual: Upper Scorpius
Abstract:
We aim at identifying very low-mass isolated planetary-mass member
candidates in the nearest OB association to the Sun, Upper Scorpius
(145pc; 5-10Myr), to constrain the form and shape of the luminosity
function and mass spectrum in this regime. We conducted a deep
multi-band (Y=21.2, J=20.5, Z=22.0mag) photometric survey of six
square degrees in the central region of Upper Scorpius. We extend the
current sequence of astrometric and spectroscopic members by about two
magnitudes in Y and one magnitude in J, reaching potentially T-type
free-floating members in the association with predicted masses below
5 Jupiter masses, well into the planetary-mass regime. We extracted a
sample of 57 candidates in this area and present infrared spectroscopy
confirming two of them as young L-type members with characteristic
spectral features of 10Myr-old brown dwarfs. Among the 57 candidates,
we highlight 10 new candidates fainter than the coolest members
previously confirmed spectroscopically. We do not see any obvious sign
of decrease in the mass spectrum of the association, suggesting that
star processes can form substellar objects with masses down to
4-5 Jupiter masses.
Description:
This study makes use of two different but complementary VISTA surveys.
VISTA is a 4-m telescope based in Paranal (Chile) and equipped with the
VISTA InfraRed CAMera (VIRCAM; field of view of 1.65deg2).
On the one hand, we re-processed the deep VISTA ZYJ survey described
in Lodieu et al. (2013, J/MNRAS/435/2474).
On the other hand, we conducted a deeper Y-band survey with
VISTA/VIRCAM to be sensitive to fainter and cooler USco members
because the first epoch was limited in depth by the Y and Z filters.
We observed four VISTA/VIRCam tiles in the Y-band filter (centered at
1.02±0.10um) between May and July 2016 as part of ESO
program 095.C-0781(A) (PI Lodieu).
We also conducted observations with the Hyper Suprime-Cam (HSC; field
of view 1.5deg in diameter) on the 8.2m Subaru telescope in Mauna Kea,
Hawaii. The observations were collected in service mode on 25 May 2020
between UT=10h58 and 12h40 as part of programme S20A-QN098 (PI Lodieu).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
zyj.dat 591 617715 *Sources in the VISTA ZYJ survey
subaru.dat 687 162735 *Sources in the VISTA+Subaru fields
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Note on zyj.dat:
We list all Y,J sources in an area of about 6 square degrees in the
central region of the Upper Sco association and detected at 2.8 sigma
in 4 VISTA VIRCAM tiles (Table 1 in paper) based on the cross-match of
the Y and J catalogues with a matching radius of 3 arcsec. We
cross-matched this catalogue with the Z-band detections presented in
Lodieu et al. (2013, J/MNRAS/435/2474). We added the corresponding
detections with information from several public surveys (Pan-Starrs,
UKIDSS, AllWISE, 2MASS).
Note on subaru.dat: We cross-match zyj.dat with the catalogue of sources
detected in the Subaru Hyper Suprime-Cam survey conducted in a
1.5 square degree area centered at RA=16h13m,dec=22d36'. We removed
saturated sources (typically brighter than Z=17.5mag) and extended
sources as well as those with poor PSF fitting. The Subaru catalogue
includes identifiers, coordinates, Z photometry with its associated
error, classification (point or extended source), and flag in addition
to all the information from the other table.
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/328 : AllWISE Data Release (Cutri+ 2013)
III/334 : VISTA Deep Extragalactic Observations (VIDEO) (Jarvis+, 2013)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
II/367 : The VISTA Hemisphere Survey (VHS) catalog DR5 (McMahon+, 2020)
J/MNRAS/435/2474 : USco ZYJHK1K2 photometry and proper motions (Lodieu+, 2013)
Byte-by-byte Description of file: zyj.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [240.93/244.11] Y2 right ascension in decimal
degrees (J2000) (RA_Y2)
13- 23 F11.7 deg DEdeg [-23.7/-21.57] Y2 declination in decimal
degrees (J2000) (DEC_Y2)
25- 30 F6.3 mag Y2mag [12.75/24.4] VISTA/VIRCam Y2 band magnitude
(psfMag_Y2)
32- 36 F5.3 mag e_Y2mag [0.003/0.6] Uncertainty on the Y2mag
(psfMagErr_Y2)
38- 43 F6.3 --- Y2sharp [-0.5/0.5] Y2 sharpness (sharp_Y2)
45- 49 F5.3 --- Y2Chi2 [0.24/3] Y2 fit χ2 (chi2_Y2)
51- 61 F11.7 deg RAJ1deg [240.93/244.11] J1 right ascension (RA_J1)
63- 73 F11.7 deg DEJ1deg [-23.7/-21.57] J1 declination (DEC_J1)
75- 80 F6.3 mag J1mag [12.43/23.1] VISTA/VIRCam J1 band magnitude
(psfMag_J1)
82- 86 F5.3 mag e_J1mag [0.003/0.6] Uncertainty on the J1mag
(psfMagErr_J1)
88- 93 F6.3 --- J1sharp [-0.5/0.5] J1 sharpness (sharp_J1)
95- 99 F5.3 --- J1Chi2 [0.19/3] J1 fit χ2 (chi2_J1)
101- 122 F22.17 mas/yr pmRA [-721.6/721.6] Proper motion in right
ascension direction (pmRA*cosDE)
124- 145 F22.17 mas/yr pmDE [-719.9/722.7] Proper motion in
declination direction (pmDEC)
147- 167 E21.19 arcsec SepY2J1 [0/3] Separation between Y2 and J1 coordinates
(SepY2J1)
169- 179 F11.7 deg RAZ1deg [240.93/244.11]?=- VISTA/VIRCam Z1 right
ascension (RA_Z1)
181- 191 F11.7 deg DEZ1deg [-23.7/-21.57]?=- Z1 declination (DEC_Z1)
193- 198 F6.3 mag Z1mag [12.9/24.7]?=- VISTA/VIRCam Z1 band magnitude
(psfMag_Z1)
200- 204 F5.3 mag e_Z1mag [0.003/0.6]?=- Uncertainty on the Z1mag
(psfMagErr_Z1)
206- 211 F6.3 --- Z1sharp [-7.8/2.6]?=- Z1 sharpness (sharp_Z1)
213- 219 F7.4 --- Z1Chi2 [0.19/27.3]?=- Z1 fit χ2 (chi2_Z1)
221- 241 E21.19 arcsec SepY2Z1 [0/3]?=- Separation between Y2 and Z1
coordinates (SepY2Z1)
243- 252 F10.6 deg RAGdeg [240.93/244.11]?=- UKIDSS-DR9 (II/319) GSC
right ascension (J2000) at Ep=EpochG
(ra_GCSDR9)
254- 263 F10.6 deg DEGdeg [-23.7/-21.57]?=- UKIDSS-DR9 (II/319) GSC
declination (J2000) at Ep=EpochG (dec_GCSDR9)
265 I1 mag ZmagAp ? UKIDSS-DR9 Z default magnitude
(always NULL) (zAperMag3)
267 I1 mag YmagAp ? UKIDSS-DR9 Y default magnitude
(always NULL) (yAperMag3)
269 I1 mag JmagAp ? UKIDSS-DR9 J default magnitude
(always NULL) (jAperMag3)
271- 276 F6.3 mag HmagAp [11.78/21.8]?=- UKIDSS-DR9 H default magnitude
(hAperMag3)
278- 283 F6.3 mag KmagAp [11.59/26.7]?=- UKIDSS-DR9 K default magnitude
(k_1AperMag3)
285 I1 mag e_ZmagAp ?=- ZmagAp uncertainty (always NULL)
(zAperMag3Err)
287 I1 mag e_YmagAp ?=- YmagAp uncertainty (always NULL)
(yAperMag3Err)
289 I1 mag e_JmagAp ?=- JmagAp uncertainty (always NULL)
(jAperMag3Err)
291- 295 F5.3 mag e_HmagAp [0.001/3.3]?=- HmagAp uncertainty
(hAperMag3Err)
297- 303 F7.4 mag e_KmagAp [0.001/65]?=- KmagAp uncertainty
(k_1AperMag3Err)
305- 313 F9.4 yr EpochG [2005.4/2009.4]?=- UKIDSS-DR9 (II/319) epoch
(epoch_GCSDR9)
315- 316 I2 --- Cl [-3/1]?=- UKIDSS-DR9 object class
(mergedClass) (1)
318- 328 F11.7 deg RAAdeg [240.93/244.11]?=- AllWISE right ascension
(J2000) (RAJ2000_AllWISE)
330- 340 F11.7 deg DEAdeg [-23.7/-21.57]?=- AllWISE declination (J2000)
(DEJ2000_AllWISE)
342- 347 F6.3 mag W1mag [11/18.7]?=- WISE 3.4um band magnitude
349- 354 F6.3 mag W2mag [10.5/17.4]?=- WISE 4.6um band magnitude
356- 361 F6.3 mag W3mag [8.29/12.7]?=- WISE 12um band magnitude
363- 367 F5.3 mag W4mag [5.9/9.3]?=- WISE 22um band magnitude
369- 374 F6.3 mag Jmag [12.4/18.5]?=- 2MASS J-band magnitude
376- 381 F6.3 mag Hmag [11.7/18]?=- 2MASS H-band magnitude
383- 388 F6.3 mag Ksmag [11.6/17.3]?=- 2MASS Ks band magnitude (Kmag)
390- 394 F5.3 mag e_W1mag [0.02/0.5]?=- Uncertainty on the W1mag
396- 400 F5.3 mag e_W2mag [0.019/0.6]?=- Uncertainty on the W2mag
402- 406 F5.3 mag e_W3mag [0.02/0.6]?=- Uncertainty on the W3mag
408- 412 F5.3 mag e_W4mag [0.05/0.6]?=- Uncertainty on the W4mag
414- 418 F5.3 mag e_Jmag [0.02/0.4]?=- Uncertainty on the Jmag
420- 424 F5.3 mag e_Hmag [0.02/0.5]?=- Uncertainty on the Hmag
426- 430 F5.3 mag e_Ksmag [0.019/0.8]?=- Uncertainty on the Ksmag
(e_Kmag)
432- 443 F12.8 deg RAPdeg [240.93/244.11]?=- PS1 (II/349) right
ascension (J2000) at Ep=EpochP (RAJ2000_PS1)
445- 456 F12.8 deg DEPdeg [-23.7/-21.57]?=- PS1 (II/349) declination
(J2000) at Ep=EpochP (DEJ2000_PS1)
458- 471 F14.8 d EpochP [51296.17/56826.42]?=- PS1 (II/349) Modified
Julian Date (MJD) of the mean epoch
(Epoch_PS1)
473- 479 F7.4 mag gmag [13.9/29.5]?=- PS1 g-band AB magnitude (PSg)
481- 486 E6.4 mag e_gmag [0/0.5]?=- Uncertainty on the gmag (ePSg)
488- 495 I8 --- gFlags [0/16896056]?=- PS1 information flag bitmask
from g-band (G1)
497- 503 F7.4 mag rmag [13.8/25.2]?=- PS1 r-band AB magnitude (PSr)
505- 510 E6.4 mag e_rmag [0/0.5]?=- Uncertainty on the rmag (ePSr)
512- 519 I8 --- rFlags [0/16896056]?=- PS1 information flag bitmask
from r-band (G1)
521- 527 F7.4 mag imag [13.6/25.7]?=- PS1 i-band AB magnitude (PSi)
529- 534 E6.4 mag e_imag [0/0.5]?=- Uncertainty on the imag (ePSi)
536- 543 I8 --- iFlags [0/16896056]?=- PS1 information flag bitmask
from i-band (G1)
545- 551 F7.4 mag zmag [13.5/22.3]?=- PS1 z-band AB magnitude (PSz)
553- 558 E6.4 mag e_zmag [0/0.5]?=- Uncertainty on the zmag (ePSz)
560- 567 I8 --- zFlags [0/16896056]?=- PS1 information flag bitmask
from z-band (G1)
569- 575 F7.4 mag ymag [13.4/25.2]?=- PS1 y band AB magnitude (PSy)
577- 582 E6.4 mag e_ymag [0/0.5]?=- Uncertainty on the ymag (ePSy)
584- 591 I8 --- yFlags [0/16896056]?=- PS1 information flag bitmask
from y-band (G1)
--------------------------------------------------------------------------------
Note (1): UKIDSS-DR9 (II/319) class as follows:
0 = Noise (with a probability ≥90%; 646 occurrences)
1 = Galaxy (with a probability ≥90%; 40012 occurrences)
-1 = Star (with a probability ≥90%; 186630 occurrences)
-2 = Probable star (with a probability between 70 and 90%; 50206 occurrences)
-3 = Probable galaxy (with a probability between 70 and 90%; 1477 occurrences)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: subaru.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [242.39/244.1] Y2 right ascension (J2000)
(RA_Y2)
13- 23 F11.7 deg DEdeg [-23.33/-21.81] Y2 right declination (J2000)
(DEC_Y2)
25- 30 F6.3 mag Y2mag [14.22/23.74] VISTA/VIRCam Y2 band magnitude
(psfMag_Y2)
32- 36 F5.3 mag e_Y2mag [0.003/0.34] Uncertainty on the Y2mag
(psfMagErr_Y2)
38- 43 F6.3 --- Y2sharp [-0.5/0.5] Y2 sharpness (sharp_Y2)
45- 49 F5.3 --- Y2Chi2 [0.269/3] Y2 fit χ2 (chi2_Y2)
51- 61 F11.7 deg RAJ1deg [242.39/244.1] J1 right ascension (RA_J1)
63- 73 F11.7 deg DEJ1deg [-23.33/-21.81] J1 declination (DEC_J1)
75- 80 F6.3 mag J1mag [13.9/22.83] VISTA/VIRCam J1 band magnitude
(psfMag_J1)
82- 86 F5.3 mag e_J1mag [0.003/0.54] Uncertainty on the J1mag
(psfMagErr_J1)
88- 93 F6.3 --- J1sharp [-0.5/0.5] J1 sharpness (sharp_J1)
95- 99 F5.3 --- J1chi2 [0.19/3] J1 fit χ2 (chi2_J1)
101- 122 F22.17 mas/yr pmRA [-717.64/721.6] Proper motion in right
ascension direction (pmRA*cosDE) (pmRA)
124- 145 F22.17 mas/yr pmDE [-700.4/708.12] Proper motion in declination
(pmDEC)
147- 167 E21.19 arcsec SepY2J1 [0/3] Separation between Y2 and J1
coordinates (SepY2J1)
169- 179 F11.7 deg RAZ1deg [242.39/244.1]?=- Z1 right ascension (RA_Z1)
181- 191 F11.7 deg DEZ1deg [-23.33/-21.81]?=- Z1 declination (DEC_Z1)
193- 198 F6.3 mag Z1mag [14.3/24.36]?=- VISTA/VIRCam Z1 band magnitude
(psfMag_Z1)
200- 204 F5.3 mag e_Z1mag [0.004/0.55]?=- Uncertainty on the Z1mag
(psfMagErr_Z1)
206- 211 F6.3 --- Z1sharp [-5.64/1.88]?=- Z1 sharpness (sharp_Z1)
213- 218 F6.3 --- Z1Chi2 [0.2/14]?=- Z1 fit χ2 (chi2_Z1)
220- 240 E21.19 arcsec SepY2Z1 [0/3]?=- Separation between Y2 and Z1
coordinates (SepY2Z1)
242- 251 F10.6 deg RAGdeg [242.39/244.1]?=- UKIDSS-DR9 (II/319) GSC
right ascension (J2000) at Ep=EpochG
(ra_GCSDR9)
253- 262 F10.6 deg DEGdeg [-23.33/-21.8]?=- UKIDSS-DR9 (II/319) GSC
declination (J2000) at Ep=EpochG (dec_GCSDR9)
264- 266 I3 mag ZmagAp ?=- UKIDSS-DR9 Z default magnitude
(always NULL) (zAperMag3)
268- 270 I3 mag YmagAp ?=- UKIDSS-DR9 Y default magnitude
(always NULL) (yAperMag3)
272- 274 I3 mag JmagAp ?=- UKIDSS-DR9 J default magnitude
(always NULL) (jAperMag3)
276- 281 F6.3 mag HmagAp [13.2/19.93]?=- UKIDSS-DR9 H default magnitude
(hAperMag3)
283- 288 F6.3 mag KmagAp [12.9/19.55]?=- UKIDSS-DR9 K default magnitude
(k_1AperMag3)
290- 292 I3 mag e_ZmagAp ?=- ZmagAp uncertainty (always NULL)
(zAperMag3Err)
294- 296 I3 mag e_YmagAp ?=- YmagAp uncertainty (always NULL)
(yAperMag3Err)
298- 300 I3 mag e_JmagAp ?=- JmagAp uncertainty (always NULL)
(jAperMag3Err)
302- 306 F5.3 mag e_HmagAp [0.002/0.61]?=- HmagAp uncertainty
(hAperMag3Err)
308- 312 F5.3 mag e_KmagAp [0.002/0.9]?=- KmagAp uncertainty
(k_1AperMag3Err)
314- 322 F9.4 yr EpochG [2005.4/2009.4]?=- UKIDSS-DR9 (II/319) epoch
(epoch_GCSDR9)
324- 326 I3 --- Cl [-3/1]?=- UKIDSS-DR9 object class
(mergedClass) (1)
328- 338 F11.7 deg RAAdeg [242.39/244.1]?=- AllWISE right ascension
(J2000) (RAJ2000_AllWISE)
340- 350 F11.7 deg DEAdeg [-23.4/-21.81]?=- AllWISE declination (J2000)
(DEJ2000_AllWISE)
352- 357 F6.3 mag W1mag [12.7/18.52]?=- WISE 3.4um band magnitude
359- 364 F6.3 mag W2mag [12.6/17.34]?=- WISE 4.6um band magnitude
366- 371 F6.3 mag W3mag [9.7/12.66]?=- WISE 12um band magnitude
373- 377 F5.3 mag W4mag [6.1/9.2]?=- WISE 22um band magnitude
379- 384 F6.3 mag Jmag [13.9/18.43]?=- 2MASS J-band magnitude
386- 391 F6.3 mag Hmag [13.2/17.88]?=- 2MASS H-band magnitude
393- 398 F6.3 mag Ksmag [12.9/17.1]?=- 2MASS Ks-band magnitude (Kmag)
400- 404 F5.3 mag e_W1mag [0.02/0.5]?=- Uncertainty on the W1mag
406- 410 F5.3 mag e_W2mag [0.02/0.6]?=- Uncertainty on the W2mag
412- 416 F5.3 mag e_W3mag [0.05/0.6]?=- Uncertainty on the W3mag
418- 422 F5.3 mag e_W4mag [0.07/0.6]?=- Uncertainty on the W4mag
424- 428 F5.3 mag e_Jmag [0.02/0.4]?=- Uncertainty on the Jmag
430- 434 F5.3 mag e_Hmag [0.02/0.4]?=- Uncertainty on the Hmag
436- 440 F5.3 mag e_Ksmag [0.03/0.5]?=- Uncertainty on the Ksmag
(e_Kmag)
442- 453 F12.8 deg RAPdeg [242.39/244.1]?=- PS1 (II/349) right ascension
(J2000) at Ep=EpochP (RAJ2000_PS1)
455- 466 F12.8 deg DEPdeg [-23.33/-21.81]?=- PS1 (II/349) declination
(J2000) at Ep=EpochP (DEJ2000_PS1)
468- 481 F14.8 --- EpochP [54999.4/56826.42]?=- PS1 (II/349) Modified
Julian Date (MJD) of the mean epoch
(Epoch_PS1)
483- 489 F7.4 mag gmag [15.6/29.41]?=- PS1 g-band AB magnitude (PSg)
491- 496 E6.4 mag e_gmag [0/0.5]?=- Uncertainty on the gmag (ePSg)
498- 505 I8 --- gFlags [0/16896056]?=- PS1 information flag bitmask
from g-band (G1)
507- 513 F7.4 mag rmag [15.2/23.51]?=- PS1 r-band AB magnitude (PSr)
515- 520 E6.4 mag e_rmag [0/0.5]?=- Uncertainty on the rmag (ePSr)
522- 529 I8 --- rFlags [0/16896056]?=- PS1 information flag bitmask
from r-band (G1)
531- 537 F7.4 mag imag [15/22.46]?=- PS1 i-band AB magnitude (PSi)
539- 544 E6.4 mag e_imag [0/0.5]?=- Uncertainty on the imag (ePSi)
546- 553 I8 --- iFlags [0/16896056]?=- PS1 information flag bitmask
from i-band (G1)
555- 561 F7.4 mag zmag [14.9/21.96]?=- PS1 z-band AB magnitude (PSz)
563- 568 E6.4 mag e_zmag [0/0.5]?=- Uncertainty on the zmag (ePSz)
570- 577 I8 --- zFlags [0/16896056]?=- PS1 information flag bitmask
from z-band (G1)
579- 585 F7.4 mag ymag [13.7/22.11]?=- PS1 y-band AB magnitude (PSy)
587- 592 E6.4 mag e_ymag [0/0.5]?=- Uncertainty on the ymag (ePSy)
594- 601 I8 --- yFlags [0/16896056]?=- PS1 information flag bitmask
from y-band (G1)
603- 615 I13 --- HSC Subaru/HSC identification number (id_HSC)
617- 628 F12.8 deg RAHdeg [242.39/244.1] Subaru/HSC right ascension
(J2000) (ra_HSC)
630- 641 F12.8 deg DEHdeg [-23.33/-21.81] Subaru/HSC declination
(J2000) (dec_HSC)
643- 650 F8.5 mag zmagHSC [16.24/29.96]?=- Subaru/HSC z-band magnitude
(converted to Vega system) (zMag_HSC)
652- 659 E8.5 mag e_zmagHSC [0.00018/14.4] ZmagHSC uncertainty
(zMagSig_HSC)
661- 663 F3.1 --- ClHSC [0] Subaru/HSC classification (always "0"
= point source) (class_HSC)
665 I1 --- HSCFl [0] Subaru/HSC flag (always "0" = good)
(badPsfFlag_HSC)
667- 687 E21.19 arcsec Sep [0.0005/3] Separation between VISTA Y2 and
Subaru/HSC coordinates (Separation)
--------------------------------------------------------------------------------
Note (1): UKIDSS-DR9 (II/319) class as follows:
0 = Noise (with a probability ≥90%; 90 occurrences)
1 = Galaxy (with a probability ≥90%; 11394 occurrences)
-1 = Star (with a probability ≥90%; 46559 occurrences)
-2 = Probable star (with a probability between 70 and 90%; 15088 occurrences)
-3 = Probable galaxy (with a probability between 70 and 90%; 404 occurrences)
--------------------------------------------------------------------------------
Global notes:
Note (G1): Flag bitmask values from ObjectFilterFlags table in PS1 (II/349):
1 = Used within relphot (SECFSTARFEW): skip star.
2 = Used within relphot (SECFSTARPOOR): skip star.
4 = Synthetic photometry used in average measurement.
8 = Ubercal photometry used in average measurement.
16 = PS1 photometry used in average measurement.
32 = PS1 stack photometry exists.
64 = Tycho photometry used for synthetic magnitudes.
128 = Synthetic magnitudes repaired with zeropoint map.
256 = Average magnitude calculated in 0th pass.
512 = Average magnitude calculated in 1th pass.
1024 = Average magnitude calculated in 2th pass.
2048 = Average magnitude calculated in 3th pass.
4096 = Average magnitude calculated in 4th pass.
8192 = Extended in this band (PSPS only).
16384 = PS1 stack photometry comes from primary skycell.
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Acknowledgements:
Nicolas Lodieu [IAC, Tenerife, Spain]
(End) Nicolas Lodieu [IAC], Emmanuelle Perret [CDS] 22-Feb-2021