J/A+A/624/A87 Discovery of a resolved disk around Wray 15-788 (Bohn+, 2019)
Discovery of a directly imaged disk in scattered light around the Sco-Cen
member Wray 15-788.
Bohn A.J., Kenworthy M.A., Ginski C., Benisty M., de Boer J.,
Keller C.U., Mamajek E.E., Meshkat T., Muro-Arena G.A., Pecaut M.J.,
Snik F., Wolff S.G., Reggiani M.
<Astron. Astrophys. 624, A87 (2019)>
=2019A&A...624A..87B 2019A&A...624A..87B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence; Stars, K-type; Planets; HR diagrams
Keywords: protoplanetary disks - planets and satellites: formation -
planet-disk interactions - techniques: image processing -
stars:individual: Wray 15-788 - stars:individual: HD 98363
Abstract:
Protoplanetary disks are the birth environments of planetary systems.
Therefore, the study of young, circumstellar environments is essential
to understanding the processes taking place in planet formation and
the evolution of planetary systems.
We detect and characterize circumstellar disks and potential
companions around solar-type, pre-main sequence stars in the
Scorpius-Centaurus association (Sco-Cen).
As part of our ongoing survey we carried out high-contrast imaging
with VLT/SPHERE/IRDIS to obtain polarized and total intensity images
of the young (11+16-7)Myr old) K3IV star Wray 15-788 within the
Lower Centaurus Crux subgroup of Sco-Cen. For the total intensity
images, we remove the stellar halo via an approach based on reference
star differential imaging in combination with principal component
analysis. Both total intensity and polarimetric data resolve a disk
around the young, solar-like Sco-Cen member Wray 15-788. Modeling of
the stellar spectral energy distribution suggests that this is
protoplanetary disk at a transition stage. We detect a bright outer
ring at a projected separation of ∼370mas (∼56au), hints of inner
substructures at ∼170mas (∼28au), and a gap in between. Within a
position angle range of only 60°<φ<240°, we are confident
at the 5σ level that we detect actual scattered light flux from
the outer ring of the disk; the remaining part is indistinguishable
from background noise. For the detected part of the outer ring we
determine a disk inclination of i=21°±6° and a position
angle of ϕ=76°±16°. Furthermore, we find that Wray
15-788 is part of a binary system with the A2V star HD 98363 at a
separation of ∼50arcsec (∼6900,au).
The detection of only half of the outer ring might be due to shadowing
by a misaligned inner disk. A potential substellar companion can cause
the misalignment of the inner structures and can be responsible for
clearing the detected gap from scattering material.However, we cannot
rule out the possibility of a non-detection due to our limited
signal-to-noise ratio, combined with brightness azimuthal asymmetry.
From our data we can exclude companions more massive than 10M{jup}
within the gap at a separation of ∼230mas (∼35au). Additional data are
required to characterize the disk's peculiar morphology and to set
tighter constraints on the potential perturber's orbital parameters
and mass.
Description:
Fits images corresponding to the imagery presented in the paper. The
data are obtained with VLT/SPHERE/IRDIS. The data reduction is
performed with the latest version of PynPoint. In both total and
polarized intensity we resolve a disk around the K-type pre-main
sequence star Wray 15-788. SED analysis suggests that this is a
protoplanetary disk at a transition stage.
Objects:
---------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------
11 17 51.87 -64 02 05.6 Wray 15-788 = Hen 3-632
---------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 191 2 Stellar parameters of Wray 15-788 and HD 98363
fig_9.dat 16 44 Detection limits of our data reduction
list.dat 151 12 List of fits images
fits/* . 12 Individual fits images
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Target Target name
13- 30 F18.14 deg RAdeg Right Ascension (J2000.0)
32- 49 F18.14 deg DEdeg Declination (J2000.0)
51- 55 A5 --- SpType Spectral type
57- 60 F4.2 Msun Mass Mass
62- 65 I4 K Teff Effective temperature
67- 71 F5.2 Lsun Lum Luminosity
73- 74 I2 yr Age Age
76- 77 I2 yr B_Age Upper uncertainty on Age
79- 80 I2 yr b_Age Lower uncertainty on Age
82- 98 F17.15 mas plx Parallax
100-106 F7.3 pc Dist Distance
108-126 F19.15 mas pmRA Proper motion along Right Ascension
128-145 F18.15 mas pmDE Proper motion along Declination
147-151 F5.2 mag Vmag V magnitude
153-156 F4.2 mag B-V B-V color index
158-161 F4.2 mag Jmag J magnitude
163-166 F4.2 mag Hmag H magnitude
168-171 F4.2 mag Kmag K magnitude
173-176 F4.2 mag W1mag Wise 1 magnitude
178-181 F4.2 mag W2mag Wise 2 magnitude
183-186 F4.2 mag W3mag Wise 3 magnitude
188-191 F4.2 mag W4mag Wise 4 magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig_9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.2 arcsec Sep Projected separation
6- 10 F5.2 mag DeltaH Magnitude contrast H band
12- 16 F5.2 mag DeltaKs Magnitude contrast Ks band
--------------------------------------------------------------------------------
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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 33 I4 Kibyte size Size of FITS file
35- 45 A11 --- FileName Name of FITS file, in subdirectory fits
47-151 A105 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Alexander Julian Bohn, bohn(at)strw.leidenuniv.nl
(End) A. Bohn [Leiden Obs., The Netherlands], Patricia Vannier [CDS] 11-Mar-2019