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First Scattered-light Images of the Gas-rich Debris Disk around 49 Ceti

Choquet, Élodie and Mawet, Dimitri (2017) First Scattered-light Images of the Gas-rich Debris Disk around 49 Ceti. Astrophysical Journal Letters, 834 (2). Art. No. L12. ISSN 2041-8205. doi:10.3847/2041-8213/834/2/L12.

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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 73°, 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 gray color of 49 Ceti's dust, indicating grains larger than ≳2 μm. 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 hypothetical scenarios for the gas nature and origin.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Choquet, Élodie0000-0002-9173-0740
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2017 The American Astronomical Society. Received 2016 November 9; revised 2016 December 19; accepted 2016 December 19; published 2017 January 9. E.C. acknowledges support from NASA through Hubble Fellowship grant HST-HF2-51355 awarded by STScI, operated by AURA, Inc. under contract NAS5-26555, and support from HST-AR-12652, for research carried out at the Jet Propulsion Laboratory, California Institute of Technology. J.M. acknowledges ESO through the ESO fellowship program. M.B. acknowledges support from DFG project Kr 2164/15-1. G.M.K. is supported by the Royal Society as a Royal Society University Research Fellow. C.d.B. is supported by Mexican CONACyT research grant CB-2012-183007. L.M. acknowledges support by STFC through a graduate studentship. J.C.A. acknowledges support by the Programme National de Planétologie. We acknowledge support by the European Union through ERC grant 337569 for O.A. and C.A.G.G. and grant 279973 for M.W. and L.M.
Group:Astronomy Department
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF2-51355
European Southern Observatory (ESO)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)Kr 2164/15-1
Consejo Nacional de Ciencia y Tecnología (CONACYT)CB-2012-183007
Science and Technology Facilities Council (STFC)UNSPECIFIED
Programme National de PlanétologieUNSPECIFIED
European Research Council (ERC)337569
European Research Council (ERC)27997
Subject Keywords:circumstellar matter – stars: individual (49 Ceti) – techniques: image processing
Issue or Number:2
Record Number:CaltechAUTHORS:20170110-072851219
Persistent URL:
Official Citation:Élodie Choquet et al 2017 ApJL 834 L12
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73359
Deposited By: Tony Diaz
Deposited On:10 Jan 2017 16:52
Last Modified:11 Nov 2021 05:15

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