2015ApJ...798...96R


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST09:02:48

2015ApJ...798...96R - Astrophys. J., 798, 96 (2015/January-2)

On the morphology and chemical composition of the HR 4796A debris disk.

RODIGAS T.J., STARK C.C., WEINBERGER A., DEBES J.H., HINZ P.M., CLOSE L., CHEN C., SMITH P.S., MALES J.R., SKEMER A.J., PUGLISI A., FOLLETTE K.B., MORZINSKI K., WU Y.-L., BRIGUGLIO R., ESPOSITO S., PINNA E., RICCARDI A., SCHNEIDER G. and XOMPERO M.

Abstract (from CDS):

We present resolved images of the HR 4796A debris disk using the Magellan adaptive optics system paired with Clio-2 and VisAO. We detect the disk at 0.77 µm, 0.91 µm, 0.99 µm, 2.15 µm, 3.1 µm, 3.3 µm, and 3.8 µm. We find that the deprojected center of the ring is offset from the star by 4.76±1.6 AU and that the deprojected eccentricity is 0.06±0.02, in general agreement with previous studies. We find that the average width of the ring is 14–2+3% (11.1–1.6+2.4 AU), also comparable to previous measurements. Combining our new scattered light data with archival Hubble Space Telescope images at ∼0.5-2 µm, along with previously unpublished Spitzer/MIPS thermal emission data and all other literature thermal data, we set out to constrain the chemical composition of the dust grains. After testing 19 individual root compositions and more than 8400 unique mixtures of these compositions, we find that good fits to the scattered light alone and thermal emission alone are discrepant, suggesting that caution should be exercised if fitting to only one or the other. When we fit to both data sets simultaneously, we find that silicates and organics are generally the most favored, while large abundances of water ice are usually not favored. These results suggest the HR 4796A dust grains are similar to interstellar dust and solar system comets, though improved modeling is necessary to place better constraints on the exact chemical composition of the dust.

Abstract Copyright:

Journal keyword(s): circumstellar matter - instrumentation: adaptive optics - planetary systems - stars: individual: HR 4796A - techniques: high angular resolution

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 15115 PM* 02 26 16.2457708887 +06 17 33.187984874   7.15 6.80   6.33 F4IV 142 0
2 HD 32297 * 05 02 27.4357771761 +07 27 39.682335894   8.32 8.14     A0V 137 0
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1596 1
4 HD 61005 PM* 07 35 47.4624262763 -32 12 14.042600581   8.96 8.22     G8Vk 159 0
5 HD 95086 * 10 57 03.0216129217 -68 40 02.446874288   7.60 7.36     A8III 114 1
6 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 533 1
7 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1097 3
8 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 853 1

    Equat.    Gal    SGal    Ecl

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2019.10.14-09:02:48

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