2021ApJ...920...22S -
Astrophys. J., 920, 22-22 (2021/October-2)
Chandra X-ray observations of V830 Tau: a T Tauri star hosting an evanescent planet.
SKINNER S.L. and GUDEL M.
Abstract (from CDS):
The radial velocity study by Donati et al. (2016) reported the detection of a close-in giant planet in a 4.93 day orbit around the ∼2 Myr old weak-lined T Tauri star V830 Tau. Because of the stringent timescale constraints that a very young host star like V830 Tau would place on hot-Jupiter formation models and inward-migration mechanisms, independent confirmation of the planet's existence is needed but so far has not been obtained. We present new Chandra X-ray observations of V830 Tau. The Chandra observations in combination with previous XMM-Newton observations reveal strong, variable X-ray emission with an X-ray luminosity spanning the range log Lx = 30.10-30.87 erg s–1. Chandra High Energy Transmission Grating spectra show emission lines formed over a range of plasma temperatures from ∼4 MK (Ne IX) to ∼16 MK (S XV). At the separation of the reported planet (0.057 au) the X-ray flux is ∼106-107 times greater than the Sun's X-ray flux at Jupiter. We provide estimates of the X-ray ionization and atmospheric heating rates at the planet's separation and identify areas of uncertainty that will need to be addressed in any future atmospheric models.
Abstract Copyright:
© 2021. The American Astronomical Society. All rights reserved.
Journal keyword(s):
T Tauri stars - X-ray stars - stars: individual
Simbad objects:
10
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