J/A+A/678/A8 HD 110058 inner disk warp (Stasevic+, 2023)
An inner warp discovered in the disk around HD 110058 using VLT/SPHERE and
HST/STIS.
Stasevic S., Milli J., Mazoyer J., Lagrange A.-M., Bonnefoy M.,
Faramaz-Gorka V., Menard F., Boccaletti A., Choquet E., Shuai L.,
Olofsson J., Chomez A., Ren B., Rubini P., Desgrange C., Gratton R.,
Chauvin G., Vigan A., Matthews E.
<Astron. Astrophys. 678, A8 (2023)>
=2023A&A...678A...8S 2023A&A...678A...8S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Spectroscopy ; Optical ; Infrared
Keywords: techniques: high angular resolution - planet-disk interactions -
stars: individual: HD 110058
Abstract:
An edge-on debris disk was detected in 2015 around the young, nearby
A0V star HD 110058. The disk showed features resembling those seen in
the disk of beta Pictoris that could indicate the presence of a
perturbing planetary-mass companion in the system.
We investigated new and archival scattered light images of the disk in
order to characterise its morphology and spectrum. In particular, we
analysed the disk's warp to constrain the properties of possible
planetary perturbers.
Using data from two VLT/SPHERE observations taken with the Integral
Field Spectrograph (IFS) and near InfraRed Dual-band Imager and
Spectrograph (IRDIS), we obtained high-contrast images of the edge-on
disk. Additionally, we used archival data from HST/STIS with a poorer
inner-working angle but a higher sensitivity to detect the outer parts
of the disk. We measured the morphology of the disk by analysing
vertical profiles along the length of the disk to extract the centroid
spine position and vertical height. We extracted the surface
brightness and reflectance spectrum of the disk.
We detect the disk between 20 au (with SPHERE) and 150 au (with STIS),
at a position angle of 159.6±0.6 degrees. Analysis of the spine shows
an asymmetry between the two sides of the disk, with a
3.4±0.9 degrees warp between ∼20au and 60au. The disk is marginally
vertically resolved in scattered light, with a vertical aspect ratio
of 9.3±0.7% at 45au. The extracted reflectance spectrum is
featureless, flat between 0.95 micron and 1.1 micron, and red from
1.1 micron to 1.65 micron. The outer parts of the disk are also
asymmetric with a tilt between the two sides compatible with a disk
made of forward-scattering particles and seen not perfectly edge-on,
suggesting an inclination of <84 degrees.
The presence of an undetected planetary-mass companion on an inclined
orbit with respect to the disk could explain the warp. The
misalignment of the inner parts of the disk with respect to the outer
disk suggests a warp that has not yet propagated to the outer parts of
the disk, favouring the scenario of an inner perturber as the origin
of the warp.
Description:
Two VLT/SPHERE observations of HD 110058 taken with the Integral Field
Spectrograph (IFS) and near InfraRed Dual-band Imager and Spectrograph
(IRDIS) taken on 2015-04-04 using the YJH-K12 filter, and 2015-04-13
using the YJ-H23 filter. Data were reduced using angular differential
imaging (ADI) and reference-star differential imaging (RDI) for the
H23-IRDIS data. Both epochs were combined for the IFS data.
Objects:
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RA (2000) DE Designation(s)
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12 39 46.19 -49 11 55.5 HD 110058 = TIC 161162039
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 125 6 List of fits datacubes
fits/* . 6 Individual fits datacubes
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 24 F5.3 arcsec/pix scale ? Scale of the image
26- 28 I3 --- Nx Number of pixels along X-axis (RA)
30- 32 I3 --- Ny Number of pixels along Y-axis (DE)
34- 35 I2 --- Nz Number of pixels along Z-axis (Nframe)
37 I1 --- Nt Number of pixels along T-axis (WAVE)
39- 62 A24 "datime" Obs.date Observation date
64- 68 I5 Kibyte size Size of FITS file
70- 82 A13 --- FileName Name of FITS file, in subdirectory fits
84-125 A42 --- Title Title of the FITS file
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Acknowledgements:
Sophia Stasevic, sophia.stasevic(at)obspm.fr
(End) Patricia Vannier [CDS] 25-Aug-2023