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X-Ray and Ultraviolet Emission of the Young Planet-hosting Star V1298 Tau from Coordinated Observations with XMM-Newton and Hubble Space Telescope

Maggio, A. ; Pillitteri, I. ; Argiroffi, C. ; Benatti, S. ; Sanz-Forcada, J. ; D’Orazi, V. ; Biazzo, K. ; Borsa, F. ; Cabona, L. ; Claudi, R. ; Desidera, S. ; Locci, D. ; Nardiello, D. ; Mancini, L. ; Micela, G. ; Rainer, M. ; Spinelli, R. ; Bignamini, A. ; Damasso, M.

The Astrophysical journal, 2023-07, Vol.951 (1), p.18 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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Título:
X-Ray and Ultraviolet Emission of the Young Planet-hosting Star V1298 Tau from Coordinated Observations with XMM-Newton and Hubble Space Telescope
Autor: Maggio, A. ; Pillitteri, I. ; Argiroffi, C. ; Benatti, S. ; Sanz-Forcada, J. ; D’Orazi, V. ; Biazzo, K. ; Borsa, F. ; Cabona, L. ; Claudi, R. ; Desidera, S. ; Locci, D. ; Nardiello, D. ; Mancini, L. ; Micela, G. ; Rainer, M. ; Spinelli, R. ; Bignamini, A. ; Damasso, M.
Assuntos: Astrophysics ; Atmospheric models ; Calibration ; Chromosphere ; Corona ; Emission measurements ; Evaporation ; Extrasolar planets ; Extreme ultraviolet astronomy ; High energy astronomy ; Hubble Space Telescope ; Irradiation ; Photochemistry ; Planet formation ; Planetary evolution ; Planets ; Pre-main sequence stars ; Protoplanetary disks ; Scaling laws ; Single x-ray stars ; Solar energy ; Space telescopes ; Star-planet interactions ; Stars ; Stars & galaxies ; Stellar activity ; Stellar evolution ; Ultraviolet emission ; Ultraviolet spectroscopy ; Wavelengths ; X-ray astronomy ; X-rays ; XMM (spacecraft)
É parte de: The Astrophysical journal, 2023-07, Vol.951 (1), p.18
Notas: AAS45584
Stars and Stellar Physics
Descrição: Abstract Atmospheric mass loss plays a major role in the evolution of exoplanets. This process is driven by the stellar high-energy irradiation, especially in the first hundreds of millions of years after dissipation of the proto-planetary disk. A major source of uncertainty in modeling atmospheric photoevaporation and photochemistry is due to the lack of direct measurements of the stellar flux at extreme-UV (EUV) wavelengths. Several empirical relationships have been proposed in the past to link EUV fluxes to emission levels in X-rays, but the stellar samples employed for this aim are heterogeneous, and the available scaling laws provide significantly different predictions, especially for very active stars. We present new far-UV and X-ray observations of V1298 Tau with Hubble Space Telescope/Cosmic Origins Spectrograph and XMM-Newton, aimed to determine more accurately the high-energy emission of this solar-mass pre-main-sequence star, which hosts four exoplanets. Spectroscopic data were employed to derive the plasma emission measure distribution versus temperature, from the chromosphere to the corona, and the possible variability of this irradiation on short and year-long timescales, due to magnetic activity. As a side result, we have also measured the chemical abundances of several elements in the outer atmosphere of V1298 Tau. We employ our results as a new benchmark point for the calibration of the X-ray to EUV scaling laws, and hence to predict the time evolution of the irradiation in the EUV band, and its effect on the evaporation of exo-atmospheres.
Editor: Philadelphia: The American Astronomical Society
Idioma: Inglês

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X-Ray and Ultraviolet Emission of the Young Planet-hosting Star V1298 Tau from Coordinated Observations with XMM-Newton and Hubble Space Telescope

Maggio, A. ; Pillitteri, I. ; Argiroffi, C. ; Benatti, S. ; Sanz-Forcada, J. ; D’Orazi, V. ; Biazzo, K. ; Borsa, F. ; Cabona, L. ; Claudi, R. ; Desidera, S. ; Locci, D. ; Nardiello, D. ; Mancini, L. ; Micela, G. ; Rainer, M. ; Spinelli, R. ; Bignamini, A. ; Damasso, M.

Philadelphia: The American Astronomical Society

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