Article (Scientific journals)
First scattered-light images of the gas-rich debris disk around 49 Ceti
Choquet, É.; Milli, J.; Wahhaj, Z. et al.
2017In Astrophysical Journal. Letters, 834 (2), p. 12
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Keywords :
circumstellar matter; stars: individual (49 Ceti); techniques: image processing
Abstract :
[en] We present the first scattered-light images of the debris disk around 49 ceti, a ~40 Myr A1 main sequence star at 59 pc, famous for hosting two massive dust belts as well as large quantities of atomic and molecular gas. The outer disk is revealed in reprocessed archival Hubble Space Telescope NICMOS F110W images, as well as new coronagraphic H band images from the Very Large Telescope SPHERE instrument. The disk extends from 1.1" (65 AU) to 4.6" (250 AU), and is seen at an inclination of 73degr, which refines previous measurements at lower angular resolution. We also report no companion detection larger than 3 M_Jup at projected separations beyond 20 AU from the star (0.34"). Comparison between the F110W and H-band images is consistent with a grey color of 49 ceti's dust, indicating grains larger than >2microns. Our photometric measurements indicate a scattering efficiency / infrared excess ratio of 0.2-0.4, relatively low compared to other characterized debris disks. We find that 49 ceti presents morphological and scattering properties very similar to the gas-rich HD 131835 system. From our constraint on the disk inclination we find that the atomic gas previously detected in absorption must extend to the inner disk, and that the latter must be depleted of CO gas. Building on previous studies, we propose a schematic view of the system describing the dust and gas structure around 49 ceti and hypothetic scenarios for the gas nature and origin.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Choquet, É.
Milli, J.
Wahhaj, Z.
Soummer, R.
Roberge, A.
Augereau, J.-C.
Booth, M.
Absil, Olivier  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Boccaletti, A.
Chen, C. H.
Debes, J. H.
del Burgo, C.
Dent, W. R. F.
Ertel, S.
Girard, J. H.
Gofas-Salas, E.
Golimowski, D. A.
Gómez González, Carlos ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Hagan, J. B.
Hibon, P.
Hines, D. C.
Kennedy, G. M.
Lagrange, A.-M.
Matrà, L.
Mawet, D.
Mouillet, D.
N'Diaye, M.
Perrin, M. D.
Pinte, C.
Pueyo, L.
Rajan, A.
Schneider, G.
Wolff, S.
Wyatt, M.
More authors (24 more) Less
Language :
English
Title :
First scattered-light images of the gas-rich debris disk around 49 Ceti
Publication date :
09 January 2017
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
IOP Publishing, Bristol, United Kingdom
Volume :
834
Issue :
2
Pages :
L12
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy
Name of the research project :
VORTEX
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
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