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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
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Official URL: http://dx.doi.org/10.3847/1538-4357/ab2b98
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 | ||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of 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 | ||||||||||||||||||||||||||||||||||||
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| Date of first compliant deposit: | 2 October 2019 | ||||||||||||||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||||||||||||
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