2009A&A...498L..41L


Query : 2009A&A...498L..41L

2009A&A...498L..41L - Astronomy and Astrophysics, volume 498, L41-44 (2009/5-2)

The spin-orbit alignment of the Fomalhaut planetary system probed by optical long baseline interferometry.

LE BOUQUIN J.-B., ABSIL O., BENISTY M., MASSI F., MERAND A. and STEFL S.

Abstract (from CDS):

We discuss the spin-orbit orientation of the Fomalhaut planetary system composed of a central A4V star, a debris disk, and a recently discovered planetary companion. We use spectrally resolved, near-IR long baseline interferometry to obtain precise spectro-astrometric measurements across the Br-γ absorption line. The achieved astrometric accuracy of ±3µas and the spectral resolution R=1500 from the AMBER/VLTI instrument allow us to spatially and spectrally resolve the rotating photosphere. We find a position angle PAstar=65°±3° for the stellar rotation axis, perpendicular to the literature measurement for the disk position angle (PAdisk=156.0deg±0.3deg). This is the first time such a test could be performed for a debris disk, and in a non-eclipsing system. Additionally, our measurements suggest unexpected backward-scattering properties for the circumstellar dust grains. Our observations validate the standard scenario for star and planet formation in which the angular momentum of the planetary systems are expected to be colinear with the stellar spins.

Abstract Copyright:

Journal keyword(s): stars: individual: Fomalhaut - stars: planetary systems - methods: observational - techniques: high angular resolution - techniques: interferometric - stars: rotation

Simbad objects: 7

goto Full paper

goto View the references 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 - 2023
#notes
1 HD 17156b Pl 02 49 44.4866941172 +71 45 11.632197644           ~ 175 1
2 BD+57 793b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 203 1
3 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2623 0
4 * alf PsA b Pl 22 57 39.04625 -29 37 20.0533           ~ 194 1
5 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1196 3
6 * c02 Aqr PM* 23 09 26.7960449399 -21 10 20.694738029 6.09 4.87 3.64 2.80 2.20 K1.5III 98 0
7 * gam Scl PM* 23 18 49.4407630 -32 31 55.288965   5.528 4.406     K1III 78 0

To bookmark this query, right click on this link: simbad:objects in 2009A&A...498L..41L and select 'bookmark this link' or equivalent in the popup menu


2023.02.09-10:23:09

© Université de Strasbourg/CNRS

    • Contact