Discovery of Resolved Debris Disk Around HD 131835

TL;DR

This paper reports the discovery and detailed analysis of a resolved debris disk around the 15-million-year-old star HD 131835, revealing its structure, composition, and grain temperature profiles through infrared imaging and modeling.

Contribution

It presents the first resolved imaging of the debris disk around HD 131835 and models its complex structure with three distinct grain populations.

Findings

Disk extends to ~200 AU at 11.7 and 18.3 μm.

The disk is inclined at ~75° with a position angle of ~61°.

Grains are hotter than blackbody predictions, especially in the continuous disk.

Abstract

We report the discovery of the resolved disk around HD 131835 and present the analysis and modeling of its thermal emission. HD 131835 is a ~15 Myr A2 star in the Scorpius-Centaurus OB association at a distance of 122.7 +16.2 -12.8 parsec. The extended disk has been detected to ~1.5" (200 AU) at 11.7 {\mu}m and 18.3 {\mu}m with T-ReCS on Gemini South. The disk is inclined at an angle of ~75{\deg} with the position angle of ~61{\deg}. The flux of HD 131835 system is 49.3+-7.6 mJy and 84+-45 mJy at 11.7 {\mu}m and 18.3 {\mu}m respectively. A model with three grain populations gives a satisfactory fit to both the spectral energy distribution and the images simultaneously. This best-fit model is composed of a hot continuous power-law disk and two rings. We characterized the grain temperature profile and found that the grains in all three populations are emitting at temperatures higher than blackbodies. In particular, the grains in the continuous disk are unusually warm; even when considering small graphite particles as the composition.