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ISPY – NaCo imaging survey for planets around young stars

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Musso Barcucci, Arianna, Launhardt, Ralf, Kennedy, Grant M., Avenhaus, Henning, Brems, Stefan S., van Boekel, Roy, Cantalloube, F., Cheetham, Anthony, Cugno, Gabriele, Girard, Julien et al.
(2019) ISPY – NaCo imaging survey for planets around young stars. Astronomy & Astrophysics, 627 . A77. doi:10.1051/0004-6361/201935146 ISSN 0004-6361.

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Official URL: http://dx.doi.org/10.1051/0004-6361/201935146

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Abstract

Context. The interaction between low-mass companions and the debris discs they reside in is still not fully understood. A debris disc can evolve due to self-stirring, a process in which planetesimals can excite their neighbours to the point of destructive collisions. In addition, the presence of a companion could further stir the disc (companion-stirring). Additional information is necessary to understand this fundamental step in the formation and evolution of a planetary system, and at the moment of writing only a handful of systems are known where a companion and a debris disc have both been detected and studied at the same time.

Aims. Our primary goal is to augment the sample of these systems and to understand the relative importance between self-stirring and companion-stirring.

Methods. In the course of the VLT/NaCo Imaging Survey for Planets around Young stars (ISPY), we observed HD 193571, an A0 debris disc hosting star at a distance of 68 pc with an age between ∼60 and 170 Myr. We obtained two sets of observations in L′ band and a third epoch in H band using the GPI instrument at Gemini-South.

Results. A companion was detected in all three epochs at a projected separation of ∼11 au (∼0.17″), and co-motion was confirmed through proper motion analysis. Given the inferred disc size of 120 au, the companion appears to reside within the gap between the host star and the disc. Comparison between the L′ and H band magnitude and evolutionary tracks suggests a mass of ∼0.31 − 0.39 M⊙.

Conclusions. We discovered a previously unknown M-dwarf companion around HD 193571, making it the third low-mass stellar object discovered within a debris disc. A comparison to self- and companion-stirring models suggests that the companion is likely responsible for the stirring of the disc.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Stars, Astrophysics, Planets, Satellites, Extrasolar planets -- Detection
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: 3 July 2019
Dates:
DateEvent
3 July 2019Published
20 May 2019Accepted
Volume: 627
Article Number: A77
DOI: 10.1051/0004-6361/201935146
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Copyright Holders: © A. Musso Barcucci et al. 2019
Date of first compliant deposit: 21 August 2019
Date of first compliant Open Access: 21 August 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
200021_169131Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://viaf.org/viaf/150746866
UNSPECIFIEDIniciativa Científica Milenio (Chile)http://viaf.org/viaf/130928259
UNSPECIFIEDUniversidad de Valparaísohttp://viaf.org/viaf/142087361
1180395Fondo Nacional de Desarrollo Científico y Tecnológicohttp://viaf.org/viaf/133259425
21170650Comisión Nacional de Investigación Científica y Tecnológicahttp://viaf.org/viaf/142087361
MU 4172/1-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
QU 113/6-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
UNSPECIFIED[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
UNSPECIFIEDNational Science Foundationhttp://dx.doi.org/10.13039/100000001
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