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A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527

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arxiv 1206.2654 v1 pith:CAN37DJM submitted 2012-06-12 astro-ph.SR

A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527

Beth Biller , Sylvestre Lacour , Attila Juh\'asz , Myriam Benisty , Gael Chauvin , Johan Olofsson , J\"org-Uwe Pott , Andr\'e M\"uller
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Aurora Sicilia-Aguilar Micka\"el Bonnefoy Peter Tuthill Philippe Thebault Thomas Henning Aurelien Crida
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keywords diskcompanionlow-massstarstellarclose-indetectedflux
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With the uniquely high contrast within 0.1" (\Delta mag(L') = 5-6.5 magnitudes) available using Sparse Aperture Masking (SAM) with NACO at VLT, we detected asymmetry in the flux from the Herbig Fe star HD 142527 with a barycenter emission situated at a projected separation of 88+/-5 mas (12.8+/-1.5 AU at 145 pc) and flux ratios in H, K, and L' of 0.016+/-0.007, 0.012+/-0.008, 0.0086+/-0.0011 respectively (3-\sigma errors) relative to the primary star and disk. After extensive closure-phase modeling, we interpret this detection as a close-in, low-mass stellar companion with an estimated mass of ~0.1-0.4 M_Sun. HD 142527 has a complex disk structure, with an inner gap imaged in both the near and mid-IR as well as a spiral feature in the outer disk in the near-IR. This newly detected low-mass stellar companion may provide a critical explanation of the observed disk structure.

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