X-ray and UV emission of the ultrashort-period, low-mass eclipsing binary system BX Tri
arXiv:1809.00971 · doi:10.1051/0004-6361/201834116
Abstract
Close binary systems provide an excellent tool to determine stellar parameters such as radii and masses with a high degree of precision. Due to the high rotational velocities, most of these systems exhibit strong signs of magnetic activity, which has been postulated to be the underlying reason for radius inflation in many of the components. We aim to extend the sample of low-mass binary systems with well-known X-ray properties. For this, we analyze data from a singular XMM-Newton pointing of the close, low-mass eclipsing binary system BX Tri. The UV light curve is modeled with the eclipsing binary modeling tool PHOEBE and data acquired with the EPIC cameras is analyzed to search for hints of orbital modulation. We find clear evidence of orbital modulation in the UV light curve and show that PHOEBE is fully capable of modeling data within this wavelength range. Comparison to a theoretical flux prediction based on PHOENIX models shows that the majority of UV emission is of photospheric origin. While the X-ray light curve does exhibit strong variations, the signal-to-noise ratio of the observation is insufficient for a clear detection of signs of orbital modulation. There is evidence of a Neupert-like correlation between UV and X-ray data.
6 pages, 8 figures; Received 22 August 2018 / Accepted 4 September 2018
References in corpus (9)
- Gaia Data Release 2. Summary of the contents and survey properties
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- Superflares on Solar Type Stars Observed with Kepler I. Statistical Properties of Superflares
- Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. I. Stars with a Radiative Core
- New periodic variable stars coincident with ROSAT sources discovered using SuperWASP
- Reevaluating the Mass-Radius Relation for Low-Mass, Main Sequence Stars
- The shortest period field contact binary
- White-Light Flares on Close Binaries Observed with Kepler
- Low-mass eclipsing binaries in the WFCAM Transit Survey: the persistence of the M-dwarf radius inflation problem