A likely close-in low-mass stellar companion to the transitional disk star HD 142527

Beth Biller (Lead / Corresponding author), Sylvestre Lacour, Attila Juhasz, Myriam Benisty, Gael Chauvin, Johan Olofsson, Joerg-Uwe Pott, Andre Mueller, Aurora Sicilia-Aguilar, Mickael Bonnefoy, Peter Tuthill, Philippe Thebault, Thomas Henning, Aurelien Crida

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Abstract

With the uniquely high contrast within 0 ''.1 (Delta mag(L') = 5-6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, 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, and 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 similar to 0.1-0.4 M-circle dot. 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.
Original languageEnglish
Article numberL38
Number of pages5
JournalAstrophysical Journal Letters
Volume753
Issue number2
DOIs
Publication statusPublished - 26 Jun 2012

Keywords

  • brown dwarfs circumstellar matter planetary systems stars: emission-line, Be stars: low-mass HERBIG AE/BE STARS MAIN-SEQUENCE STARS CIRCUMBINARY DISCS APERTURE MASKING PLANET FORMATION EVOLUTION REGIONS IMAGES LINE

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    Biller, B., Lacour, S., Juhasz, A., Benisty, M., Chauvin, G., Olofsson, J., Pott, J-U., Mueller, A., Sicilia-Aguilar, A., Bonnefoy, M., Tuthill, P., Thebault, P., Henning, T., & Crida, A. (2012). A likely close-in low-mass stellar companion to the transitional disk star HD 142527. Astrophysical Journal Letters, 753(2), [L38]. https://doi.org/10.1088/2041-8205/753/2/L38