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J/A+A/598/A43     2MASS J16042165-2130284 high-contrast images  (Canovas+, 2017)

Constraining the mass of the planet(s) sculpting a disk cavity. The intriguing case of 2MASS J16042165-2130284. Canovas H., Hardy A., Zurlo A., Wahhaj Z., Schreiber M.R., Vigan A., Villaver E., Olofsson J., Meeus G., Menard F., Caceres C., Cieza L.A., Garufi A. <Astron. Astrophys. 598, A43 (2017)> =2017A&A...598A..43C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, pre-main sequence ; Stars, K-type Keywords: protoplanetary disks - planet-disk interactions - stars: variables: T Tauri, Herbig Ae/Be - techniques: high angular resolution - stars: individual: 2MASS J16042165-2130284 Abstract: The large cavities observed in the dust and gas distributions of transition disks may be explained by planet-disk interactions. At 145pc, 2MASS J16042165-2130284 (J1604) is a 5-12Myr old transitional disk with different gap sizes in the mm- and micron-sized dust distributions (outer edges at 79 and at 63AU, respectively). Its 12CO emission shows a 30 au cavity. This radial structure suggests that giant planets are sculpting this disk. We aim to constrain the masses and locations of plausible giant planets around J1604. We observed J1604 with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) at the Very Large Telescope (VLT), in IRDIFS_EXT, pupil-stabilized mode, obtaining YJH- band images with the integral field spectrograph (IFS) and K1K2-band images with the Infra-Red Dual-beam Imager and Spectrograph (IRDIS). The dataset was processed exploiting the angular differential imaging (ADI) technique with high-contrast algorithms. Our observations reach a contrast of ΔK, ΔYH∼12mag from 0.15" to 0.80" (∼22 to 115AU), but no planet candidate is detected. The disk is directly imaged in scattered light at all bands from Y to K, and it shows a red color. This indicates that the dust particles in the disk surface are mainly ≳0.3um-sized grains. We confirm the sharp dip/decrement in scattered light in agreement with polarized light observations. Comparing our images with a radiative transfer model we argue that the southern side of the disk is most likely the nearest. This work represents the deepest search yet for companions around J1604. We reach a mass sensitivity of ≳2-3MJup from ∼22 to ∼115AU according to a hot start scenario. We propose that a brown dwarf orbiting inside of ∼15AU and additional Jovian planets at larger radii could account for the observed properties of J1604 while explaining our lack of detection. Description: The article describes high-contrast images of the protoplanetary disk 2MASS J16042165-2130284, obtained with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE). * Fig1.fits: It corresponds to Fig. 1 of the article. The file contains the Angular Differential Imaging (ADI) + Principal Component Analysis (PCA) image of the disk in K1 band, showing no point sources inside of the disk cavity from ∼22 au onwards. * Fig4_ifs.fits: It corresponds to Fig. 4 (IFS part) of the article. The datacube contains the 3 IFS broadband images, corresponding to the Y [*,*, 0], J [*,*,1], H [*,*,2] bands. * Fig4_ird.fits: It corresponds to Fig. 4 (IRDIS part) of the article. The datacube contains the 2 IRDIS images (220x220pix), corresponding to the K1 [*,*, 0], and K2 [*,*,1] bands. Objects: ------------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------------- 16 04 21.655 -21 30 28.40 J1604 = 2MASS J16042165-2130284 ------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 108 3 List of fits files fits/* 0 3 Individual fits files
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 26 F7.5 arcsec/pix Scale Scale of the image 28- 30 I3 --- Nx Number of pixels along X-axis 32- 34 I3 --- Ny Number of pixels along Y-axis 36- 59 A24 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.sss) 61- 63 I3 Kibyte Size Size of FITS file 65- 77 A13 --- FileName Name of FITS file, in subdirectory fits 79-108 A30 --- Title Title of the FITS file
Acknowledgements: Hector Canovas, Hector.canovas(at)
(End) H. Canovas [Univ. Autonoma Madrid, Spain], P. Vannier [CDS] 21-Oct-2016
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