2019A&A...630A..85B


Query : 2019A&A...630A..85B

2019A&A...630A..85B - Astronomy and Astrophysics, volume 630A, 85-85 (2019/10-1)

Spatially resolved spectroscopy of the debris disk HD 32297. Further evidence of small dust grains.

BHOWMIK T., BOCCALETTI A., THEBAULT P., KRAL Q., MAZOYER J., MILLI J., MAIRE A.L., VAN HOLSTEIN R.G., AUGEREAU J.-C., BAUDOZ P., FELDT M., GALICHER R., HENNING T., LAGRANGE A.-M., OLOFSSON J., PANTIN E. and PERROT C.

Abstract (from CDS):


Context. Spectro-photometry of debris disks in total intensity and polarimetry can provide new insight into the properties of the dust grains therein (size distribution and optical properties).
Aims. We aim to constrain the morphology of the highly inclined debris disk HD 32297. We also intend to obtain spectroscopic and polarimetric measurements to retrieve information on the particle size distribution within the disk for certain grain compositions.
Methods. We observed HD 32297 with SPHERE in Y, J, and H bands in total intensity and in J band in polarimetry. The observations are compared to synthetic models of debris disks and we developed methods to extract the photometry in total intensity overcoming the data-reduction artifacts, namely the self-subtraction. The spectro-photometric measurements averaged along the disk mid-plane are then compared to model spectra of various grain compositions.
Results. These new images reveal the very inner part of the system as close as 0.15''. The disk image is mostly dominated by the forward scattering making one side (half-ellipse) of the disk more visible, but observations in total intensity are deep enough to also detect the back side for the very first time. The images as well as the surface brightness profiles of the disk rule out the presence of a gap as previously proposed. We do not detect any significant asymmetry between the northeast and southwest sides of the disk. The spectral reflectance features a "gray to blue" color which is interpreted as the presence of grains far below the blowout size.
Conclusions. The presence of sub-micron grains in the disk is suspected to be the result of gas drag and/or "avalanche mechanisms". The blue color of the disk could be further investigated with additional total intensity and polarimetric observations in K and H bands respectively to confirm the spectral slope and the fraction of polarization.

Abstract Copyright: © T. Bhowmik et al. 2019

Journal keyword(s): techniques: image processing - stars: individual: HD 32297 - techniques: high angular resolution - methods: data analysis - infrared: planetary systems

VizieR on-line data: <Available at CDS (J/A+A/630/A85): list.dat fits/*>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 15115 PM* 02 26 16.2457848552 +06 17 33.186453252   7.15 6.80   6.33 F4IV 191 0
2 HD 32297 * 05 02 27.4358754192 +07 27 39.678553260   8.32 8.14     A0V 183 0
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1837 1
4 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 610 1
5 HD 120326 * 13 49 54.5032282344 -50 14 23.876991348   8.75 8.39     F0V 60 0
6 V* NZ Lup BY* 15 53 27.2916958608 -42 16 00.710765508   8.48 7.975   7.213 G2 94 0
7 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1083 0

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2023.06.01-04:25:46

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