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A Swift view of X-ray and UV radiation in the planet-forming T-Tauri system PDS 70

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posted on 2020-03-27, 11:10 authored by Simon Joyce, John Pye, Jonathan Nichols, Kim Page, Richard Alexander, Manuel Gudel, Yanina Metodieva

PDS 70 is a ∼5-Myr-old star with a gas and dust disc in which several protoplanets have been discovered. We present the first ultraviolet (UV) detection of the system along with X-ray observations taken with the Neil Gehrels Swift Observatory satellite. PDS 70 has anX-ray flux of 3.4×10^−13 erg cm^−2s^−1 in the 0.3–10.0 keV range, and UV flux (U band) of 3.5×10^−13 erg cm^−2s^−1. At the distance of 113.4 pc determined from Gaia Data Release 2, this gives luminosities of 5.2×10^29 and 5.4×10^29 erg s^−1, respectively. The X-ray luminosity is consistent with coronal emission from a rapidly rotating star close to he log LX/Lbol ∼−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.

Funding

The ExoplANETS-A project is funded from the EU’s Horizon-2020 programme; grant agreement no. 776403. This work used data supplied by the UK Swift Science Data Centre, University of Leicester. KLP acknowledges support from the UK Space Agency. We acknowledge use of CDS SIMBAD and NASA ADS facilities. RA received funding from the European Research Council (grant agreement no. 681601).

History

Citation

Monthly Notices of the Royal Astronomical Society: Letters, Volume 491, Issue 1, January 2020, Pages L56–L60, https://doi.org/10.1093/mnrasl/slz169

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society: Letters

Volume

491

Issue

1

Pagination

L56 - L60

Publisher

Oxford University Press (OUP)

issn

1745-3925

eissn

1745-3933

Acceptance date

2019-10-31

Copyright date

2019

Available date

2019-11-05

Publisher version

https://academic.oup.com/mnrasl/article-abstract/491/1/L56/5613380?redirectedFrom=fulltext

Notes

This work was carried out aspart of the ExoplANETS-A project http://exoplanet-atmosphere.eu (Exoplanet Atmosphere New Emission Transmission Spectra Analysis); https://cordis.europa.eu/project/rcn/212911en.html;

Language

en

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