Query : 2016A&A...596A..92K

2016A&A...596A..92K - Astronomy and Astrophysics, volume 596A, 92-92 (2016/12-1)

ALMA observations of the nearby AGB star L2 Puppis. I. Mass of the central star and detection of a candidate planet.


Abstract (from CDS):

Six billion years from now, while evolving on the asymptotic giant branch (AGB), the Sun will metamorphose from a red giant into a beautiful planetary nebula. This spectacular evolution will impact the solar system planets, but observational confirmations of the predictions of evolution models are still elusive as no planet orbiting an AGB star has yet been discovered. The nearby AGB red giant L2 Puppis (d=64pc) is surrounded by an almost edge-on circumstellar dust disk. We report new observations with ALMA at very high angular resolution (18x15mas) in band 7 (ν~=350GHz) that allow us to resolve the velocity profile of the molecular disk. We establish that the gas velocity profile is Keplerian within the central cavity of the dust disk, allowing us to derive the mass of the central star L2 Pup A, mA=0.659±0.011±0.041M (±6.6%). From evolutionary models, we determine that L2 Pup A had a near-solar main-sequence mass, and is therefore a close analog of the future Sun in 5 to 6Gyr. The continuum map reveals a secondary source (B) at a radius of 2AU contributing fB/fA=1.3±0.1% of the flux of the AGB star. L2 Pup B is also detected in CO emission lines at a radial velocity of vB=12.2±1.0km/s. The close coincidence of the center of rotation of the gaseous disk with the position of the continuum emission from the AGB star allows us to constrain the mass of the companion to mB=12±16MJup. L2 Pup B is most likely a planet or low-mass brown dwarf with an orbital period of about five years. Its continuum brightness and molecular emission suggest that it may be surrounded by an extended molecular atmosphere or an accretion disk. L2 Pup therefore emerges as a promising vantage point on the distant future of our solar system.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: individual: HD 56096 - stars: AGB and post-AGB - circumstellar matter - techniques: high angular resolution - planetary systems - planets and satellites: detection

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1490 0
2 V* R Dor AB* 04 36 45.59127 -62 04 37.7974 7.84 6.98 5.40 2.71 -0.44 M8III:e 325 0
3 QSO B0537-441 BLL 05 38 50.3617339512 -44 05 08.940591924   15.77 16.48 16   ~ 840 2
4 [VV2006] J070134.6-463436 QSO 07 01 34.5464144280 -46 34 36.627996180   18.82 19.5 19.44   ~ 65 1
5 * L02 Pup AB* 07 13 32.3185436236 -44 38 22.951891964 7.90 6.66 5.10 2.49 0.07 M5IIIe 208 0
6 2FGL J0727.0-4726 QSO 07 26 26.2402246992 -47 28 53.359592376       19.18   ~ 49 2
7 V* NN Ser CV* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 254 0

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