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The REASONS Survey : resolved millimeter observations of a large debris disk around the nearby F Star HD 170773

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Sepulveda, Aldo G., Matrà, Luca, Kennedy, Grant M., Burgo, Carlos del, Öberg, Karin I., Wilner, David J., Marino, Sebastián, Booth, Mark, Carpenter, John M., Davies, Claire L., Dent, William R. F., Ertel, Steve, Lestrade, Jean-Francois, Marshall, Jonathan P., Milli, Julien, Wyatt, Mark C., MacGregor, Meredith A. and Matthews, Brenda C. (2019) The REASONS Survey : resolved millimeter observations of a large debris disk around the nearby F Star HD 170773. The Astrophysical Journal, 881 (1). 84. doi:10.3847/1538-4357/ab2b98 ISSN 0004-637X.

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Official URL: http://dx.doi.org/10.3847/1538-4357/ab2b98

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Abstract

Debris disks are extrasolar analogs to our own Kuiper Belt and they are detected around at least 17% of nearby Sun-like stars. The morphology and dynamics of a disk encode information about its history, as well as that of any exoplanets within the system. We used the Atacama Large Millimeter/submillimeter Array (ALMA) to obtain 1.3 mm observations of the debris disk around the nearby F5V star HD 170773. We image the face-on ring and determine its fundamental parameters by forward-modeling the interferometric visibilities through a Markov Chain Monte Carlo approach. Using a symmetric Gaussian surface density profile, we find a 71 ± 4 au wide belt with a radius of {193}-3+2 au, a relatively large radius compared with most other millimeter-resolved belts around late A/early F type stars. This makes HD 170773 part of a group of four disks around A and F stars with radii larger than expected from the recently reported planetesimal belt radius—stellar luminosity relation. Two of these systems are known to host directly imaged giant planets, which may point to a connection between large belts and the presence of long-period giant planets. We also set upper limits on the presence of CO and CN gas in the system, which imply that the exocomets that constitute this belt have CO and HCN ice mass fractions of <77% and <3%, respectively. This is consistent with solar system comets and other exocometary belts.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Circumstellar matter , Disks (Astrophysics) , Interferometry
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 14 August 2019
Dates:
DateEvent
14 August 2019Published
19 June 2019Accepted
Volume: 881
Number: 1
Article Number: 84
DOI: 10.3847/1538-4357/ab2b98
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 2 October 2019
Date of first compliant Open Access: 2 October 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
AST-1659473National Science Foundationhttp://dx.doi.org/10.13039/501100008982
AST-1659473U.S. Department of Defensehttp://dx.doi.org/10.13039/100000005
Submillimeter Array (SMA) FellowSmithsonian Institutionhttp://dx.doi.org/10.13039/100000014
University Research FellowRoyal Societyhttp://dx.doi.org/10.13039/501100000288
CVU No.448248Consejo Nacional de Ciencia y Tecnologíahttp://dx.doi.org/10.13039/501100003141
Kr 2164/15-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
15XRP15_20140 [NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
639889European Research Councilhttp://dx.doi.org/10.13039/501100000781
MOST104-2628-M001-004-MY3 Ministry of Science and Technology, Taiwanhttp://dx.doi.org/10.13039/501100004663
MOST107-2119-M-001-031-MY3, Ministry of Science and Technology, Taiwanhttp://dx.doi.org/10.13039/501100004663
AS-IA-106-M03Academia Sinicahttp://dx.doi.org/10.13039/501100001869
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