Two cold belts in the debris disk around the G-type star NZ Lupi

stars: individual: NZ Lup; planet-disk interactions; techniques: high angular resolution; techniques: image processing; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics

Abstract :

[en] Context. Planetary systems hold the imprint of the formation and of the evolution of planets especially at young ages, and in particular at the stage when the gas has dissipated leaving mostly secondary dust grains. The dynamical perturbation of planets in the dust distribution can be revealed with high-contrast imaging in a variety of structures. Aims: SPHERE, the high-contrast imaging device installed at the VLT, was designed to search for young giant planets in long period, but is also able to resolve fine details of planetary systems at the scale of astronomical units in the scattered-light regime. As a young and nearby star, NZ Lup was observed in the course of the SPHERE survey. A debris disk had been formerly identified with HST/NICMOS. Methods: We observed this system in the near-infrared with the camera in narrow and broad band filters and with the integral field spectrograph. High contrasts are achieved by the mean of pupil tracking combined with angular differential imaging algorithms. Results: The high angular resolution provided by SPHERE allows us to reveal a new feature in the disk which is interpreted as a superimposition of two belts of planetesimals located at stellocentric distances of 85 and 115 au, and with a mutual inclination of about 5°. Despite the very high inclination of the disk with respect to the line of sight, we conclude that the presence of a gap, that is, a void in the dust distribution between the belts, is likely. Conclusions: We discuss the implication of the existence of two belts and their relative inclination with respect to the presence of planets. Reduced images of Fig. 1 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-stras bg.fr">http://cdsarc.u-strasbg.fr</A>(ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/625/A21">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/625/A21</A>Based on data collected at the European Southern Observatory, Chile under programs 097.C-0523, 097.C-0865, 198.C-0209.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Boccaletti, A.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France

Thébault, P.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France

Pawellek, N.; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany

Lagrange, A.-M.; CNRS, IPAG, Université Grenoble Alpes, 38000, Grenoble, France

Galicher, Raphaël; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France

Desidera, S.; INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy

Milli, J.; CNRS, IPAG, Université Grenoble Alpes, 38000, Grenoble, France ; European Southern Observatory, Alonso de Córdova 3107, Casilla, 19001, Vitacura, Santiago 19, Chile

Kral, Q.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195, Meudon, France

Bonnefoy, M.; CNRS, IPAG, Université Grenoble Alpes, 38000, Grenoble, France

Augereau, J.-C.; CNRS, IPAG, Université Grenoble Alpes, 38000, Grenoble, France

More authors (29 more)

Language :

English

Title :

Two cold belts in the debris disk around the G-type star NZ Lupi

Publication date :

01 May 2019

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

625

Pages :

A21

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://ui.adsabs.harvard.edu/abs/2019A&A...625A..21B

Available on ORBi :

since 21 January 2020

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