The hot Jupiter and magnetic activity of V830 Tau
Citation:
Donati, J. F., Yu, L., Moutou, C., Cameron, A. C., Malo, L., Grankin, K., Hebrard, E. M., Hussain, G. A. J., Vidotto, A. A., Alencar, S. H. P., Haywood, R. D., Bouvier, J., Petit, P., Takami, M., Herczeg, G. J., Gregory, S. G., Jardine, M., Morin, J., and the MaTYSSE collaboration, The hot Jupiter and magnetic activity of V830 Tau, Monthly Notices of the Royal Astronomical Society, 465, 2017, 3343 --Download Item:
Abstract:
We report results of an extended spectropolarimetric and ph
otometric monitoring of the weak-
line T Tauri star V830 Tau and its recently-detected newborn
close-in giant planet. Our obser-
vations, carried out within the MaTYSSE programme, were spr
ead over 91 d, and involved the
ESPaDOnS and Narval spectropolarimeters linked to the 3.6-
m Canada-France-Hawaii, the 2-
m Bernard Lyot and the 8-m Gemini-North Telescopes. Using Ze
eman-Doppler Imaging, we
characterize the surface brightness distributions, magne
tic topologies and surface di
ff
erential
rotation of V830 Tau at the time of our observations, and demo
nstrate that both distributions
evolve with time beyond what is expected from di
ff
erential rotation. We also report that near
the end of our observations, V830 Tau triggered one major flar
e and two weaker precursors,
showing up as enhanced red-shifted emission in multiple spe
ctral activity proxies.
With 3 di
ff
erent filtering techniques, we model the radial velocity (RV
) activity jitter (of
semi-amplitude 1.2 km s
−
1
) that V830 Tau generates, successfully retrieve the 68
±
11 m s
−
1
RV planet signal hiding behind the jitter, further confirm th
e existence of V830 Tau b and
better characterize its orbital parameters. We find that the
method based on Gaussian-process
regression performs best thanks to its higher ability at mod
elling not only the activity jitter, but
also its temporal evolution over the course of our observati
ons, and succeeds at reproducing
our RV data down to a rms precision of 35 m s
−
1
. Our result provides new observational
constraints on scenarios of star
/
planet formation and demonstrates the scientific potential
of
large-scale searches for close-in giant planets around T Ta
uri stars.
Author's Homepage:
http://people.tcd.ie/vidottoaDescription:
PUBLISHED
Author: VIDOTTO, ALINE
Type of material:
Journal ArticleCollections
Series/Report no:
Monthly Notices of the Royal Astronomical Society465
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