Chandra X-Ray Observations of V830 Tau: A T Tauri Star Hosting an Evanescent Planet

Autor(en)

Stephen Lee Skinner, Manuel Güdel

Abstrakt

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 similar to 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 L (x) = 30.10-30.87 erg s(-1). Chandra High Energy Transmission Grating spectra show emission lines formed over a range of plasma temperatures from similar to 4 MK (Ne ix) to similar to 16 MK (S xv). At the separation of the reported planet (0.057 au) the X-ray flux is similar to 10(6)-10(7) 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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of Colorado, Boulder

Journal

The Astrophysical Journal

Band

920

Anzahl der Seiten

12

ISSN

0004-637X

DOI

https://doi.org/10.3847/1538-4357/ac111a

Publikationsdatum

10-2021

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/df8c4fc1-714f-4f19-b558-f3ac6393be7d