J/A+A/627/A77 HD193571 NaCo images (Musso Barcucci+, 2019)
ISPY - NaCo Imaging Survey for Planets around Young stars:
Discovery of an M-dwarf in the gap between HD 193571 and its debris ring.
Musso Barcucci A., Launhardt R., Kennedy G. M., Avenhaus H., Brems S.,
van Boekel R., Cheetham A., Cugno G., Girard J., Godoy N., Henning T.,
Metchev S., Mueller A., Olofsson J., Pepe F., Quanz S.P., Quirrenbach A.,
Reffert S., Rickman E.L., Samland M., Segransan D.
<Astron. Astrophys. 627, A77 (2019)>
=2019A&A...627A..77M 2019A&A...627A..77M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets
Keywords: stars: individual: HD193571 - planet-disk interactions -
planets and satellites: detection - infrared: planetary systems -
instrumentation: high angular resolution -
techniques: high angular resolution
Abstract:
The interaction between low-mass companions and the debris disks they
reside in is still not fully understood. A debris disk can evolve due
to self-stirring, a process in which planetesimals can excite their
neighbours to the point of destructive collisions. On top of this, the
presence of a companion could further stir the disk
(companion-stirring). Additional information is necessary to
understand this fundamental step in the formation and evolution of a
planetary system, and at the moment of writing only a handful of
systems are known in which both a companion and a debris disk have
been detected and studied at the same time.
Our primary goal is to augment the sample of such systems and
understand the relative importance between self-stirring and
companion-stirring.
In the course of the VLT/NaCo-ISPY Imaging Survey for Planets around
Young stars, we observed HD 193571, an A0 debris disk hosting star at
a distance of 68 pc with an age between 60-170Myr. We obtained two
sets of observations in L' band and a third epoch in H band using
the GPI instrument at Gemini-South.
A companion was detected in all three epochs at a projected separation
of 11au (0.17-arcsec), and co-motion was confirmed through proper
motion analysis. Given the inferred disk size of 120au, the companion
appears to reside within the gap between the host star and the disk.
Comparison between the L' and H band magnitude and evolutionary
tracks suggests a mass of 0.31-0.39M☉.
We discovered a previously unknown M-dwarf companion around HD 193571,
making it the third low-mass stellar object discovered within a debris
disk. Comparison to self- and companion-stirring models suggests that
the companion is likely responsible for the stirring of the disk.
Description:
We included several observations of the star HD193571, taken with
different instruments and setup, which are:
-Classically ADI reduced images for two NaCo observations in the L'
band, and one GPI-IFS observation in the H band.
-Differential polarisation imaging data taken with SPHERE/IRDIS with
the H broad band filter.
We also included the companion spectrum extracted from the GPI IFS
data.
Objects:
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RA (2000) DE Designation(s)
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20 22 27.50 -42 02 58.4 HD193571 = HR 7779
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 119 5 List of fits files
fits/* . 5 Individual fits files
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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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 31 I2 --- Nz ? Number of slices for the datacube
33- 37 I5 Kibyte size Size of FITS file
39- 50 A12 --- FileName Name of FITS file, in subdirectory fits
52-119 A68 --- Title Title of the FITS file
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Acknowledgements:
Arianna Musso Barcucci, musso(at)mpia.de
(End) Arianna Musso Barcucci [MPIA, Germany], Patricia Vannier [CDS] 27-May-2019