2014A&A...563A..72F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:29:07

2014A&A...563A..72F - Astronomy and Astrophysics, volume 563A, 72-72 (2014/3-1)

Can eccentric debris disks be long-lived? A first numerical investigation and application to ζ2 Reticuli.

FARAMAZ V., BEUST H., THEBAULT P., AUGEREAU J.-C., BONSOR A., DEL BURGO C., ERTEL S., MARSHALL J.P., MILLI J., MONTESINOS B., MORA A., BRYDEN G., DANCHI W., EIROA C., WHITE G.J. and WOLF S.

Abstract (from CDS):

Imaging of debris disks has found evidence for both eccentric and offset disks. One hypothesis is that they provide evidence for massive perturbers, for example, planets or binary companions, which sculpt the observed structures. One such disk was recently observed in the far-IR by the Herschel Space Observatory around ζ2 Reticuli. In contrast with previously reported systems, the disk is significantly eccentric, and the system is several Gyr old. We aim to investigate the long-term evolution of eccentric structures in debris disks caused by a perturber on an eccentric orbit around the star. We hypothesise that the observed eccentric disk around ζ2 Reticuli might be evidence of such a scenario. If so, we are able to constrain the mass and orbit of a potential perturber, either a giant planet or a binary companion. Analytical techniques were used to predict the effects of a perturber on a debris disk. Numerical N-body simulations were used to verify these results and further investigate the observable structures that may be produced by eccentric perturbers. The long-term evolution of the disk geometry was examined, with particular application to the ζ2 Reticuli system. In addition, synthetic images of the disk were produced for direct comparison with Herschel observations. We show that an eccentric companion can produce both the observed offsets and eccentric disks. These effects are not immediate, and we characterise the timescale required for the disk to develop to an eccentric state (and any spirals to vanish). For ζ2 Reticuli, we derive limits on the mass and orbit of the companion required to produce the observations. Synthetic images show that the pattern observed around ζ2 Reticuli can be produced by an eccentric disk seen close to edge-on, and allow us to bring additional constraints on the disk parameters of our model (disk flux and extent). We conclude that eccentric planets or stellar companions can induce long-lived eccentric structures in debris disks. Observations of such eccentric structures thus provide potential evidence of the presence of such a companion in a planetary system. We considered the specific example of ζ2 Reticuli, whose observed eccentric disk can be explained by a distant companion (at tens of AU) on an eccentric orbit (ep>0.3).

Abstract Copyright:

Journal keyword(s): circumstellar matter - methods: numerical - planetary systems - stars: individual: ζ2 Reticuli - celestial mechanics

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * zet01 Ret PM* 03 17 46.1632605674 -62 34 31.154247481 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 269 0
2 * zet02 Ret ** 03 18 12.8185412558 -62 30 22.917300282   5.814 5.228     G1V 325 0
3 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 551 1
4 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2505 0
5 HD 202628 PM* 21 18 27.2693236958 -43 20 04.746121764   7.39 6.742     G5V 141 0
6 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 524 1
7 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1115 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2014A&A...563A..72F and select 'bookmark this link' or equivalent in the popup menu


2020.07.14-18:29:08

© Université de Strasbourg/CNRS

    • Contact