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ALMA observations of the narrow HR 4796A debris ring

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Kennedy, Grant M., Marino, Sebastien, Matra, Luca, Panic, Olja, Wilner, David, Wyatt, Mark C. and Yelverton, Ben (2018) ALMA observations of the narrow HR 4796A debris ring. Monthly Notices of the Royal Astronomical Society, 475 (4). pp. 4924-4938. doi:10.1093/mnras/sty135 ISSN 1365-2966.

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Official URL: https://doi.org/10.1093/mnras/sty135

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Abstract

The young A0V star HR 4796A is host to a bright and narrow ring of dust, thought to originate in collisions between planetesimals within a belt analogous to the Solar system’s Edgeworth–Kuiper belt. Here we present high spatial resolution 880 μm continuum images from the Atacama Large Millimeter Array. The 80 au radius dust ring is resolved radially with a characteristic width of 10 au, consistent with the narrow profile seen in scattered light. Our modelling consistently finds that the disc is also vertically resolved with a similar extent. However, this extent is less than the beam size, and a disc that is dynamically very cold (i.e. vertically thin) provides a better theoretical explanation for the narrow scattered light profile, so we remain cautious about this conclusion. We do not detect 12CO J=3–2 emission, concluding that unless the disc is dynamically cold the CO+CO2 ice content of the planetesimals is of order a few per cent or less. We consider the range of semi-major axes and masses of an interior planet supposed to cause the ring’s eccentricity, finding that such a planet should be more massive than Neptune and orbit beyond 40 au. Independent of our ALMA observations, we note a conflict between mid-IR pericentre-glow and scattered light imaging interpretations, concluding that models where the spatial dust density and grain size vary around the ring should be explored.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Planetary systems, Circumstellar matter, Atacama Large Millimeter Array (Project)
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1365-2966
Official Date: 21 April 2018
Dates:
DateEvent
21 April 2018Published
16 January 2018Available
12 January 2018Accepted
Volume: 475
Number: 4
Page Range: pp. 4924-4938
DOI: 10.1093/mnras/sty135
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 15 January 2018
Date of first compliant Open Access: 8 May 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
Research FellowshipRoyal Societyhttp://dx.doi.org/10.13039/501100000288
Submillimeter Array (SMA) FellowSmithsonian Institutionhttp://dx.doi.org/10.13039/100000014
Dorothy Hodgkin FellowRoyal Societyhttp://dx.doi.org/10.13039/501100000288

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