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  The REASONS Survey: Resolved Millimeter Observations of a Large Debris Disk around the Nearby F Star HD 170773

Sepulveda, A. G., Matrà, L., Kennedy, G. M., del Burgo, C., Öberg, K. I., Wilner, D. J., et al. (2019). The REASONS Survey: Resolved Millimeter Observations of a Large Debris Disk around the Nearby F Star HD 170773. The Astrophysical Journal, 881.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D258-B Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D259-A
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...881...84S (Any fulltext)
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 Creators:
Sepulveda, Aldo G.1, Author
Matrà, Luca1, Author
Kennedy, Grant M.1, Author
del Burgo, Carlos1, Author
Öberg, Karin I.1, Author
Wilner, David J.1, Author
Marino, Sebastián1, Author
Booth, Mark1, Author
Carpenter, John M.1, Author
Davies, Claire L.1, Author
Dent, William R. F.1, Author
Ertel, Steve1, Author
Lestrade, Jean-Francois1, Author
Marshall, Jonathan P.1, Author
Milli, Julien1, Author
Wyatt, Mark C.1, Author
MacGregor, Meredith A.1, Author
Matthews, Brenda C.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: circumstellar matter planet-disk interactions stars: individual: HD 170773 techniques: interferometric Astrophysics - Earth and Planetary Astrophysics
 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‚Äîstellar 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.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 881 Sequence Number: - Start / End Page: - Identifier: -