A Swift view of X-ray and UV radiation in the planet-forming T Tauri system PDS 70
| Autor: | Jonathan D. Nichols, Manuel Güdel, Richard Alexander, S. R. G. Joyce, K. L. Page, Yanina Metodieva, John P. Pye |
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| Rok vydání: | 2019 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences Flux Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Radiation medicine.disease_cause 01 natural sciences Luminosity Planet Observatory 0103 physical sciences medicine Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Earth and Planetary Astrophysics (astro-ph.EP) Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies T Tauri star Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics Protoplanet Ultraviolet Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society: Letters |
| ISSN: | 1745-3933 1745-3925 |
| DOI: | 10.1093/mnrasl/slz169 |
| Popis: | PDS 70 is a $\sim$5 Myr old star with a gas and dust disc in which several proto-planets have been discovered. We present the first UV detection of the system along with X-ray observations taken with the \textit{Neil Gehrels Swift Observatory} satellite. PDS 70 has an X-ray flux of 3.4$\times 10^{-13}$ erg cm$^{-2}$ s$^{-1}$ in the 0.3-10.0 keV range, and UV flux (U band) of 3.5$\times 10^{-13}$ erg cm$^{-2}$ s$^{-1}$ . At the distance of 113.4 pc determined from Gaia DR2 this gives luminosities of 5.2$\times 10^{29}$ erg s$^{-1}$ and 5.4$\times 10^{29}$ erg s$^{-1}$ respectively. The X-ray luminosity is consistent with coronal emission from a rapidly rotating star close to the log $\frac{L_{\mathrm{X}}}{L_{\mathrm{bol}}} \sim -3$ saturation limit. We find the UV luminosity is much lower than would be expected if the star were still accreting disc material and suggest that the observed UV emission is coronal in origin. 5 pages, 3 figures, accepted for publication in MNRAS Letters |
| Databáze: | OpenAIRE |
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