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Logran, por primera vez, mirar dentro del «saco amniótico» de una estrella

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Autor: David Cabezas Jimeno

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High-resolution Br γ spectro-interferometry of the transitional Herbig Ae/Be star HD 100546: a Keplerian gaseous disc inside the inner rim

We present spatially and spectrally resolved Br γ emission around the planet-hosting, transitional Herbig Ae/Be star HD 100546. Aiming to gain insight into the physical origin of the
line in possible relation to accretion processes, we carried out Br γ spectro-interferometry
using Q4 AMBER/VLTI from three different baselines achieving spatial and spectral resolutions
of 2–4 mas and 12 000. The Br γ visibility is larger than that of the continuum for all baselines.
Differential phases reveal a shift between the photocentre of the Br γ line – displaced∼0.6mas
(0.06 au at 100 pc) NE from the star – and that of the K-band continuum emission – displaced
∼0.3 mas NE from the star. The photocentres of the redshifted and blueshifted components
of the Br γ line are located NW and SE from the photocentre of the peak line emission, respectively.
Moreover, the photocentre of the fastest velocity bins within the spectral line tends
to be closer to that of the peak emission than the photocentre of the slowest velocity bins.
Our results are consistent with a Br γ -emitting region inside the dust inner rim (0.25 au)
and extending very close to the central star, with a Keplerian, disc-like structure rotating
counter-clockwise, and most probably flared (∼25◦). Even though the main contribution to the
Br γ line does not come from gas magnetically channelled on to the star, accretion on to HD
100546 could be magnetospheric, implying a mass accretion rate of a few 10−7 M yr−1. This
value indicates that the observed gas has to be replenished on time-scales of a few months to
years, perhaps by planet-induced flows from the outer to the inner disc as has been reported for
Q5 similar systems."

Logran, por primera vez, mirar dentro del «saco amniótico» de una estrella
La iustración muestra la estrella HD100546 y su disco protoplanetario

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