Chandra X-Ray Observations of V830 Tau: A T Tauri Star Hosting an Evanescent Planet
- Author(s)
- Stephen Lee Skinner, Manuel Güdel
- Abstract
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(s)
- Department of Astrophysics
- External organisation(s)
- University of Colorado, Boulder
- Journal
- The Astrophysical Journal
- Volume
- 920
- No. of pages
- 12
- ISSN
- 0004-637X
- DOI
- https://doi.org/10.3847/1538-4357/ac111a
- Publication date
- 10-2021
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/df8c4fc1-714f-4f19-b558-f3ac6393be7d